Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (2024)

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (1)

Additional Information

  • Kepler's Laws of Planetary Motion
    • ​Planets move in elliptical orbits with the Sun as a focus.
    • A planet covers the same area of space in the same amount of time no matter where it is in its orbit.
    • A planet's orbital period is proportional to the size of its orbit.

." }}},{"@type": "Question","typicalAgeRange": "4-35","educationalLevel": "intermediate","eduQuestionType": "Multiple choice","learningResourceType": "Practice problem","name": "Recollect the concept of Indian Army Agniveer Technical Mock Test - 3 to solve the ques", "comment": { "@type": "Comment", "text": "A block is submerged partially in water and remaining 1/3 part is outside the water level, then the density of the block is-" },"encodingFormat": "text/html","text": "A block is submerged partially in water and remaining 1/3 part is outside the water level, then the density of the block is-","suggestedAnswer": [{ "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "0.67 g/cm3", "comment": { "@type": "Comment", "text": "A block is submerged partially in water and remaining 1/3 part is outside the water level, then the density of the block is-" }},{ "@type": "Answer", "position": 1, "encodingFormat": "text/html", "text": "0.33 g/cm3", "comment": { "@type": "Comment", "text": "A block is submerged partially in water and remaining 1/3 part is outside the water level, then the density of the block is-" }},{ "@type": "Answer", "position": 2, "encodingFormat": "text/html", "text": "1 g/cm3", "comment": { "@type": "Comment", "text": "A block is submerged partially in water and remaining 1/3 part is outside the water level, then the density of the block is-" }},{ "@type": "Answer", "position": 3, "encodingFormat": "text/html", "text": "1.5 g/cm3", "comment": { "@type": "Comment", "text": "A block is submerged partially in water and remaining 1/3 part is outside the water level, then the density of the block is-" }}],"acceptedAnswer": { "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "A", "comment": { "@type": "Comment", "text": "A block is submerged partially in water and remaining 1/3 part is outside the water level, then the density of the block is-" }, "answerExplanation": { "@type": "Comment", "text": "

CONCEPT:

  • Archimedes' principle: Every object is bouncing upwards by a force equal to the weight of the fluid the object displaces. This force is also known as the bouncing force.

Fb = ρ g Vf

Where Fb is bouncing force, ρ is the density of the fluid, Vf is the volume of the displaced fluid, and g is the acceleration due to gravity.

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (2)

CALCULATION:

Given that 1/3 part is out of water.

So, 2/3 part is submerged in water.

Let D is the density of the block

The density of wood/Density of Water = Part of block submerged/Total Part

D/1 = (2/3)/1

D = 2/3 = 0.67 g/cm3.

D = 0.67 g/cm3. So option 1 is correct.." }}},{"@type": "Question","typicalAgeRange": "4-35","educationalLevel": "intermediate","eduQuestionType": "Multiple choice","learningResourceType": "Practice problem","name": "Recollect the concept of Indian Army Agniveer Technical Mock Test - 3 to solve the ques", "comment": { "@type": "Comment", "text": "Which of these waves is a Electromagnetic waves?" },"encodingFormat": "text/html","text": "Which of these waves is a Electromagnetic waves?","suggestedAnswer": [{ "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "Sound wave", "comment": { "@type": "Comment", "text": "Which of these waves is a Electromagnetic waves?" }},{ "@type": "Answer", "position": 1, "encodingFormat": "text/html", "text": "Ultrasonic wave", "comment": { "@type": "Comment", "text": "Which of these waves is a Electromagnetic waves?" }},{ "@type": "Answer", "position": 2, "encodingFormat": "text/html", "text": "Alpha wave", "comment": { "@type": "Comment", "text": "Which of these waves is a Electromagnetic waves?" }},{ "@type": "Answer", "position": 3, "encodingFormat": "text/html", "text": "None of the above", "comment": { "@type": "Comment", "text": "Which of these waves is a Electromagnetic waves?" }}],"acceptedAnswer": { "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "D", "comment": { "@type": "Comment", "text": "Which of these waves is a Electromagnetic waves?" }, "answerExplanation": { "@type": "Comment", "text": "

The correct answer is option 4 (None of the above) listed (sound waves, ultrasonic waves, alpha wave) are classified as electromagnetic waves

  • The examples of electromagnetic waves are:
    1. Radio waves.
    2. Microwaves.
    3. Infrared waves.
    4. Visible light.
    5. Ultraviolet.
    6. X-rays.
    7. Gamma rays.
  • Radio waves are electromagnetic waves with maximum wavelength.
  • Infrared ray was discovered by William Herschell.
    • The heat of the sunlight is due to infrared waves.
    • Infrared waves are used in TV remotes.
  • Sound waves are longitudinal waves.
    • It can not travel through a vacuum.
    • The study of sound is called acoustics.
    • Sound travels faster in solids.
    • Sound waves higher than 20 kHz are called Ultrasonic sounds.

." }}},{"@type": "Question","typicalAgeRange": "4-35","educationalLevel": "intermediate","eduQuestionType": "Multiple choice","learningResourceType": "Practice problem","name": "Recollect the concept of Indian Army Agniveer Technical Mock Test - 3 to solve the ques", "comment": { "@type": "Comment", "text": "An average human being can hear sound of minimum frequency upto:" },"encodingFormat": "text/html","text": "An average human being can hear sound of minimum frequency upto:","suggestedAnswer": [{ "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "15 Hz", "comment": { "@type": "Comment", "text": "An average human being can hear sound of minimum frequency upto:" }},{ "@type": "Answer", "position": 1, "encodingFormat": "text/html", "text": "5 Hz", "comment": { "@type": "Comment", "text": "An average human being can hear sound of minimum frequency upto:" }},{ "@type": "Answer", "position": 2, "encodingFormat": "text/html", "text": "20 Hz", "comment": { "@type": "Comment", "text": "An average human being can hear sound of minimum frequency upto:" }},{ "@type": "Answer", "position": 3, "encodingFormat": "text/html", "text": "10 Hz", "comment": { "@type": "Comment", "text": "An average human being can hear sound of minimum frequency upto:" }}],"acceptedAnswer": { "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "C", "comment": { "@type": "Comment", "text": "An average human being can hear sound of minimum frequency upto:" }, "answerExplanation": { "@type": "Comment", "text": "

The correct answer is 20 Hz.Key Points

  • Around 20 Hz to 20 kHz is the frequency range in which people can hear sounds.
  • The majority of tiny mammals are not responsive to low frequencies, only to very high frequencies.
  • For instance, while some bat species are sensitive to tones as high as 200 kHz, their lower frequency threshold is closer to 20 kHz, which is the upper frequency threshold for young individuals with normal hearing.
  • Certain whales can detect infrasonic noises as low as 7 Hz.
  • Elephants can hear sounds at a frequency of 14 to 16 Hz.

." }}},{"@type": "Question","typicalAgeRange": "4-35","educationalLevel": "intermediate","eduQuestionType": "Multiple choice","learningResourceType": "Practice problem","name": "Recollect the concept of Indian Army Agniveer Technical Mock Test - 3 to solve the ques", "comment": { "@type": "Comment", "text": "

What is the approximate range of wavelength in case of visible lights?

" },"encodingFormat": "text/html","text": "

What is the approximate range of wavelength in case of visible lights?

","suggestedAnswer": [{ "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "

2000 Å to 5000 Å

", "comment": { "@type": "Comment", "text": "

What is the approximate range of wavelength in case of visible lights?

" }},{ "@type": "Answer", "position": 1, "encodingFormat": "text/html", "text": "

1000 Å to 4000 Å

", "comment": { "@type": "Comment", "text": "

What is the approximate range of wavelength in case of visible lights?

" }},{ "@type": "Answer", "position": 2, "encodingFormat": "text/html", "text": "

8000 Å to 11000 Å

", "comment": { "@type": "Comment", "text": "

What is the approximate range of wavelength in case of visible lights?

" }},{ "@type": "Answer", "position": 3, "encodingFormat": "text/html", "text": "

4000 Å to 7000 Å

", "comment": { "@type": "Comment", "text": "

What is the approximate range of wavelength in case of visible lights?

" }}],"acceptedAnswer": { "@type": "Answer", "position": 3, "encodingFormat": "text/html", "text": "d", "comment": { "@type": "Comment", "text": "

What is the approximate range of wavelength in case of visible lights?

" }, "answerExplanation": { "@type": "Comment", "text": "

The correct answer is 4000 Å to 7000 Å

Key Points

  • The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye.
  • A wavelength is the distance between two consecutive peaks of a wave.
  • The wavelength of the visible spectrum is in the range of 4000 Å to 7000 Å (A is angstrom).
  • The visible spectrum is VIBGYOR (Violet, Indigo, Blue, Green, Yellow, Orange, Red).
  • Violet has the shortest wavelength, at around 380 nanometers, and red has the longest wavelength, at around 700 nanometers in this spectrum.

Additional Information

  • The electromagnetic spectrum is the entire distribution of electromagnetic radiation according to frequency or wavelength.
  • EM radiation is created when an atomic particle, such as an electron, is accelerated by an electric field, causing it to move.
  • The movement produces oscillating electric and magnetic fields, which travel at right angles to each other in a bundle of light energy called a photon.
  • Frequency is the number of waves that form in a given length of time.
  • It is usually measured as the number of wave cycles per second, or hertz (Hz).
  • Electromagnetic radiations with shorter wavelengths than visible are called ultraviolet, X-rays, or gamma rays progressively.
  • Electromagnetic radiations with longer wavelengths than visible are called infrared, microwaves, or radio waves progressively.
  • Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (3)

." }}},{"@type": "Question","typicalAgeRange": "4-35","educationalLevel": "intermediate","eduQuestionType": "Multiple choice","learningResourceType": "Practice problem","name": "Recollect the concept of Indian Army Agniveer Technical Mock Test - 3 to solve the ques", "comment": { "@type": "Comment", "text": "Which of the following relation of value of 'g' at equator and poles of earth is correct?" },"encodingFormat": "text/html","text": "Which of the following relation of value of 'g' at equator and poles of earth is correct?","suggestedAnswer": [{ "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "poles > equator", "comment": { "@type": "Comment", "text": "Which of the following relation of value of 'g' at equator and poles of earth is correct?" }},{ "@type": "Answer", "position": 1, "encodingFormat": "text/html", "text": "poles = equator", "comment": { "@type": "Comment", "text": "Which of the following relation of value of 'g' at equator and poles of earth is correct?" }},{ "@type": "Answer", "position": 2, "encodingFormat": "text/html", "text": "poles < equator", "comment": { "@type": "Comment", "text": "Which of the following relation of value of 'g' at equator and poles of earth is correct?" }},{ "@type": "Answer", "position": 3, "encodingFormat": "text/html", "text": "No relation exists", "comment": { "@type": "Comment", "text": "Which of the following relation of value of 'g' at equator and poles of earth is correct?" }}],"acceptedAnswer": { "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "A", "comment": { "@type": "Comment", "text": "Which of the following relation of value of 'g' at equator and poles of earth is correct?" }, "answerExplanation": { "@type": "Comment", "text": "

The correct answer is Poles > equator

Key Points

  • The force of earth's gravity on the body at the equator is 9.798 m/s2 times the mass of the body, whereas at the poles it is 9.863 m/s2 times the mass of the body.
  • Thus, the force of gravity at Poles is greater than the force of gravity at the Equator.
  • The distance from the poles to the centre of the earth is lesser than the distance from the equator to the centre of the earth. Therefore the acceleration due to gravity is greater at the poles than at the equator.

Additional Information

  • The value of g on earth is maximum at the poles and goes on decreasing as we go towards the equator.
  • The value of 'g' is minimum at the equator because the earth is not a perfect sphere. Its radius is maximum at the equator. Hence, according to the equation g = GM/R2, the equator is the place where g will be minimum.
  • Even on the surface of the Earth, there are local variations in the value of g. These variations are due to latitude (the Earth isn't a perfect sphere; it buldges in the middle), altitude and the local geological structure of the region.

." }}},{"@type": "Question","typicalAgeRange": "4-35","educationalLevel": "intermediate","eduQuestionType": "Multiple choice","learningResourceType": "Practice problem","name": "Recollect the concept of Indian Army Agniveer Technical Mock Test - 3 to solve the ques", "comment": { "@type": "Comment", "text": "What is the purpose of grooves on the soles of shoes?" },"encodingFormat": "text/html","text": "What is the purpose of grooves on the soles of shoes?","suggestedAnswer": [{ "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "Is easy to wear", "comment": { "@type": "Comment", "text": "What is the purpose of grooves on the soles of shoes?" }},{ "@type": "Answer", "position": 1, "encodingFormat": "text/html", "text": "Causes less friction", "comment": { "@type": "Comment", "text": "What is the purpose of grooves on the soles of shoes?" }},{ "@type": "Answer", "position": 2, "encodingFormat": "text/html", "text": "Better grip on the floor", "comment": { "@type": "Comment", "text": "What is the purpose of grooves on the soles of shoes?" }},{ "@type": "Answer", "position": 3, "encodingFormat": "text/html", "text": "Soles act as a cushion", "comment": { "@type": "Comment", "text": "What is the purpose of grooves on the soles of shoes?" }}],"acceptedAnswer": { "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "C", "comment": { "@type": "Comment", "text": "What is the purpose of grooves on the soles of shoes?" }, "answerExplanation": { "@type": "Comment", "text": "

The correct answer is a Better grip on the floor.

Key Points

  • The soles of the shoes have grooves in order to increase friction between the surface of the floor and the soles of the shoes.
  • This prevents slipping on the floor.
  • A flat sole or a polished floor will generally reduce the friction between shoe and floor as the flat surfaces slide past each other more easily and thus grooves are necessary to prevent slipping.

Additional Information

  • Friction is the force that opposes the motion of a solid object over another.
  • There are mainly four types of friction: static friction, sliding friction, rolling friction, and fluid friction.
  • The frictional force between two bodies depends mainly on three factors:
    • The adhesion between body surfaces
    • The roughness of the surface
    • Deformation of bodies.
  • Using lubricants such as oil or grease can reduce the friction between the surfaces.

." }}},{"@type": "Question","typicalAgeRange": "4-35","educationalLevel": "intermediate","eduQuestionType": "Multiple choice","learningResourceType": "Practice problem","name": "Recollect the concept of Indian Army Agniveer Technical Mock Test - 3 to solve the ques", "comment": { "@type": "Comment", "text": "It is more convenient to wash clothes in hot water because ______" },"encodingFormat": "text/html","text": "It is more convenient to wash clothes in hot water because ______","suggestedAnswer": [{ "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "There is no surface tension", "comment": { "@type": "Comment", "text": "It is more convenient to wash clothes in hot water because ______" }},{ "@type": "Answer", "position": 1, "encodingFormat": "text/html", "text": "There is less soap used", "comment": { "@type": "Comment", "text": "It is more convenient to wash clothes in hot water because ______" }},{ "@type": "Answer", "position": 2, "encodingFormat": "text/html", "text": "Hot water has lower surface tension", "comment": { "@type": "Comment", "text": "It is more convenient to wash clothes in hot water because ______" }},{ "@type": "Answer", "position": 3, "encodingFormat": "text/html", "text": "The surface tension of hot water is more", "comment": { "@type": "Comment", "text": "It is more convenient to wash clothes in hot water because ______" }}],"acceptedAnswer": { "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "C", "comment": { "@type": "Comment", "text": "It is more convenient to wash clothes in hot water because ______" }, "answerExplanation": { "@type": "Comment", "text": "

The Correct answer is Hot water has lower surface tension.

Key Points

  • Surface tension: Surface tension is a force per unit length acting in the plane of interface between the liquid and the bounding surface.
    • Its unit is ‘N/m’ and the dimensions are [MT-2].
    • Surface tension is a property that arises due to the intermolecular forces of attraction among the molecules of the liquid.
    • Greater are the intermolecular forces of attraction; higher is the surface tension of that liquid.

EXPLANATION :

  • The surface tension decreases as the temperature increases.
  • The surface tension of hot water is very less compared to cold water and thus that makes washing clothes easier in hot water

." }}},{"@type": "Question","typicalAgeRange": "4-35","educationalLevel": "intermediate","eduQuestionType": "Multiple choice","learningResourceType": "Practice problem","name": "Recollect the concept of Indian Army Agniveer Technical Mock Test - 3 to solve the ques", "comment": { "@type": "Comment", "text": "1 Newton (N) is equal to ______." },"encodingFormat": "text/html","text": "1 Newton (N) is equal to ______.","suggestedAnswer": [{ "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "10 kg m/s2", "comment": { "@type": "Comment", "text": "1 Newton (N) is equal to ______." }},{ "@type": "Answer", "position": 1, "encodingFormat": "text/html", "text": "0.1 kg m/s2", "comment": { "@type": "Comment", "text": "1 Newton (N) is equal to ______." }},{ "@type": "Answer", "position": 2, "encodingFormat": "text/html", "text": "1 kg m/s2", "comment": { "@type": "Comment", "text": "1 Newton (N) is equal to ______." }},{ "@type": "Answer", "position": 3, "encodingFormat": "text/html", "text": "100 kg m/s2", "comment": { "@type": "Comment", "text": "1 Newton (N) is equal to ______." }}],"acceptedAnswer": { "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "C", "comment": { "@type": "Comment", "text": "1 Newton (N) is equal to ______." }, "answerExplanation": { "@type": "Comment", "text": "

Concept:

Force

  • 1 Newton is equal to the pressure with which the force of 1 N is exercised perpendicular to the area of 1 m2
  • 1 N = 1 kg m/s2
  • Newton is the unit of Force.

Pressure

  • 1 Newton per square metre (1 pascal) is equal to the pressure with which force of 1 N is exercised perpendicular to the area of 1 m2
  • 1 Pa = 1 N/m2 .
  • 1 Bar (bar) is the special name for 100000 Pa.

Normal stress (tensile or compressive), Shear stress

  • 1 Newton per square metre (1 pascal) to the mechanical stress with which the force of 1 N is exercised on the area of 1 m2
  • In many branches of engineering, the mechanical stress and strength are specified in N/m2.
  • 1 N/m2 = 1 Pa
  • 1000000 Pa = 1 MPa

Power

  • 1 Watt is equal to the power with which the energy of 1 J is converted during the time of 1 s.
  • The unit watt is also called volt-ampere in the specification of apparent electric power
  • 1 W = 1 J/s = 1 Nm s = 1 VA

." }}},{"@type": "Question","typicalAgeRange": "4-35","educationalLevel": "intermediate","eduQuestionType": "Multiple choice","learningResourceType": "Practice problem","name": "Recollect the concept of Indian Army Agniveer Technical Mock Test - 3 to solve the ques", "comment": { "@type": "Comment", "text": "Convert 1000 N in to dynes." },"encodingFormat": "text/html","text": "Convert 1000 N in to dynes.","suggestedAnswer": [{ "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "105 dyne", "comment": { "@type": "Comment", "text": "Convert 1000 N in to dynes." }},{ "@type": "Answer", "position": 1, "encodingFormat": "text/html", "text": "108 dyne", "comment": { "@type": "Comment", "text": "Convert 1000 N in to dynes." }},{ "@type": "Answer", "position": 2, "encodingFormat": "text/html", "text": "102 dyne", "comment": { "@type": "Comment", "text": "Convert 1000 N in to dynes." }},{ "@type": "Answer", "position": 3, "encodingFormat": "text/html", "text": "103 dyne", "comment": { "@type": "Comment", "text": "Convert 1000 N in to dynes." }}],"acceptedAnswer": { "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "B", "comment": { "@type": "Comment", "text": "Convert 1000 N in to dynes." }, "answerExplanation": { "@type": "Comment", "text": "

Correct answer is 108 dyne

Key Points

Newton:

  • It is the S.I unit of Force.
  • It is equal to the force that would give a mass of one kilogram an acceleration of one meter per second per second and is equivalent to 100,000 dynes.
  • 1000 Newton. = 108 dyne

Additional Information

  • CGS unit: It is the system of measurement where physical quantity is expressed in centimeter, gram and second.
  • The CGS unit of Force is dyne.

1 dyne = 1 gm cm s -2

." }}},{"@type": "Question","typicalAgeRange": "4-35","educationalLevel": "intermediate","eduQuestionType": "Multiple choice","learningResourceType": "Practice problem","name": "Recollect the concept of Indian Army Agniveer Technical Mock Test - 3 to solve the ques", "comment": { "@type": "Comment", "text": "Which of the following statements is INCORRECT regarding the magnetic lines of force?" },"encodingFormat": "text/html","text": "Which of the following statements is INCORRECT regarding the magnetic lines of force?","suggestedAnswer": [{ "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "They form a closed loop.", "comment": { "@type": "Comment", "text": "Which of the following statements is INCORRECT regarding the magnetic lines of force?" }},{ "@type": "Answer", "position": 1, "encodingFormat": "text/html", "text": "They start from the north pole and end at the south pole.", "comment": { "@type": "Comment", "text": "Which of the following statements is INCORRECT regarding the magnetic lines of force?" }},{ "@type": "Answer", "position": 2, "encodingFormat": "text/html", "text": "Their relative thickness at a point gives the strength of the magnetic field at that point.", "comment": { "@type": "Comment", "text": "Which of the following statements is INCORRECT regarding the magnetic lines of force?" }},{ "@type": "Answer", "position": 3, "encodingFormat": "text/html", "text": "They are invisible.", "comment": { "@type": "Comment", "text": "Which of the following statements is INCORRECT regarding the magnetic lines of force?" }}],"acceptedAnswer": { "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "B", "comment": { "@type": "Comment", "text": "Which of the following statements is INCORRECT regarding the magnetic lines of force?" }, "answerExplanation": { "@type": "Comment", "text": "

Correct answer is They start from the north pole and end at the south pole.

Key Points

CONCEPT:

  • Magnetic field: The magnetic field is a field produced by the magnet.
  • Magnetic field lines: Magnetic fields are represented using magnetic field lines.
    • It is used to visualize the strength and the direction of the magnetic field.
  • Properties of Magnetic Field Lines
    • At a point, the tangent drawn on the magnetic field line gives the direction of the magnetic field at that point.
    • The density of the field lines gives the strength of the field.
    • Inside a magnet, the magnetic field lines go from the south pole to the north pole.
    • Outside magnet, Magnetic field lines appear to emerge or start from the north pole and merge or terminate at the south pole.
    • Magnetic field lines form a closed-loop.
    • Magnetic field lines never intersect with each other.
    • Field lines represent both magnitude and direction at any point on the field.

EXPLANATION:

  • Magnetic field lines outside and inside the magnet are given below in the figure.

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (4)

." }}},{"@type": "Question","typicalAgeRange": "4-35","educationalLevel": "intermediate","eduQuestionType": "Multiple choice","learningResourceType": "Practice problem","name": "Recollect the concept of Indian Army Agniveer Technical Mock Test - 3 to solve the ques", "comment": { "@type": "Comment", "text": "Calcium oxide and water combine to form calcium hydroxide. This is an example of ______ reaction." },"encodingFormat": "text/html","text": "Calcium oxide and water combine to form calcium hydroxide. This is an example of ______ reaction.","suggestedAnswer": [{ "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "Both combination reaction and exothermic reaction", "comment": { "@type": "Comment", "text": "Calcium oxide and water combine to form calcium hydroxide. This is an example of ______ reaction." }},{ "@type": "Answer", "position": 1, "encodingFormat": "text/html", "text": "Combination reaction", "comment": { "@type": "Comment", "text": "Calcium oxide and water combine to form calcium hydroxide. This is an example of ______ reaction." }},{ "@type": "Answer", "position": 2, "encodingFormat": "text/html", "text": "Endothermic reaction", "comment": { "@type": "Comment", "text": "Calcium oxide and water combine to form calcium hydroxide. This is an example of ______ reaction." }},{ "@type": "Answer", "position": 3, "encodingFormat": "text/html", "text": "Exothermic reaction", "comment": { "@type": "Comment", "text": "Calcium oxide and water combine to form calcium hydroxide. This is an example of ______ reaction." }}],"acceptedAnswer": { "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "A", "comment": { "@type": "Comment", "text": "Calcium oxide and water combine to form calcium hydroxide. This is an example of ______ reaction." }, "answerExplanation": { "@type": "Comment", "text": "

The correct answer is Both combination reaction and exothermic reaction.Key Point

  • The reaction between calcium oxide (CaO) and water (H2O) to form calcium hydroxide (Ca(OH)2) is an example of a combination reaction.
  • A combination reaction is a chemical reaction in which two or more substances combine to form a single new substance.
  • In this case, calcium oxide and water combine to form calcium hydroxide.
  • Here is the chemical equation for the reaction:

CaO + H2O → Ca(OH)2 + Heat

  • Combination reactions are typically exothermic, meaning that they release heat.
  • This is because the bonds in the products are stronger than the bonds in the reactants.
  • In the case of the reaction between calcium oxide and water, the reaction is highly exothermic and releases a lot of heat.
  • Hence, the correct answer is combination and exothermic reaction.

." }}},{"@type": "Question","typicalAgeRange": "4-35","educationalLevel": "intermediate","eduQuestionType": "Multiple choice","learningResourceType": "Practice problem","name": "Recollect the concept of Indian Army Agniveer Technical Mock Test - 3 to solve the ques", "comment": { "@type": "Comment", "text": "What causes Nitrogen to be Inert?" },"encodingFormat": "text/html","text": "What causes Nitrogen to be Inert?","suggestedAnswer": [{ "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "Multiple bond formation", "comment": { "@type": "Comment", "text": "What causes Nitrogen to be Inert?" }},{ "@type": "Answer", "position": 1, "encodingFormat": "text/html", "text": "Absence of bond polarity", "comment": { "@type": "Comment", "text": "What causes Nitrogen to be Inert?" }},{ "@type": "Answer", "position": 2, "encodingFormat": "text/html", "text": "Short internuclear distance", "comment": { "@type": "Comment", "text": "What causes Nitrogen to be Inert?" }},{ "@type": "Answer", "position": 3, "encodingFormat": "text/html", "text": "High Bond energy", "comment": { "@type": "Comment", "text": "What causes Nitrogen to be Inert?" }}],"acceptedAnswer": { "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "D", "comment": { "@type": "Comment", "text": "What causes Nitrogen to be Inert?" }, "answerExplanation": { "@type": "Comment", "text": "

Concept:

  • The element Nitrogen is the first member of group 15 or V A.
  • Nitrogen is a typical non - metal. It is essential for both plants and animals.
  • The electronic configuration of Nitrogen is 1s22s22p3.
  • Nitrogen consists of mostly 78.1 % of the earth's atmosphere.
  • However, it is not equally abundant in the earth's crust. It is the third most abundant element in the earth's crust.
  • Nitrogen is an important constituent of amino acids in proteins.
  • Nitrates are highly soluble in water.

Explanation:

  • Nitrogen is an inert element, it is a diatomic gas that shows reactivity only at high temperatures.
  • The nitrogen molecule is covalent and non-polar.
  • Nitrogen forms a triple bond with other nitrogen atoms forming N2 molecules.
  • As triple bonds are strong, it is not broken by the collision between the nitrogen molecules at room temperature.
  • Furthermore, its octet is complete and it does not require additional electrons.
  • Only at high temperatures, sufficient energy is provided by the collision to break the triple bond.
  • Thus at high temperatures, nitrogen molecule gets dissociated and shows some reactivity.

Hence, the reason for Nitrogen to be inert is its high bond energy.

Mistake Points

  • Note that multiple bond formation always doesn't necessarily mean that the molecule will be inert.

." }}},{"@type": "Question","typicalAgeRange": "4-35","educationalLevel": "intermediate","eduQuestionType": "Multiple choice","learningResourceType": "Practice problem","name": "Recollect the concept of Indian Army Agniveer Technical Mock Test - 3 to solve the ques", "comment": { "@type": "Comment", "text": "A class of organic compounds that contain an oxygen between two alkyl groups is called:" },"encodingFormat": "text/html","text": "A class of organic compounds that contain an oxygen between two alkyl groups is called:","suggestedAnswer": [{ "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "alcohol", "comment": { "@type": "Comment", "text": "A class of organic compounds that contain an oxygen between two alkyl groups is called:" }},{ "@type": "Answer", "position": 1, "encodingFormat": "text/html", "text": "aldehyde", "comment": { "@type": "Comment", "text": "A class of organic compounds that contain an oxygen between two alkyl groups is called:" }},{ "@type": "Answer", "position": 2, "encodingFormat": "text/html", "text": "ketone", "comment": { "@type": "Comment", "text": "A class of organic compounds that contain an oxygen between two alkyl groups is called:" }},{ "@type": "Answer", "position": 3, "encodingFormat": "text/html", "text": "ether", "comment": { "@type": "Comment", "text": "A class of organic compounds that contain an oxygen between two alkyl groups is called:" }}],"acceptedAnswer": { "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "D", "comment": { "@type": "Comment", "text": "A class of organic compounds that contain an oxygen between two alkyl groups is called:" }, "answerExplanation": { "@type": "Comment", "text": "

The correct answer is ether.Key Points

  • Ether:-
    • It is a class of organic compounds that contains an oxygen atom between two alkyl groups.
    • The general formula for an ether is R-O-R', where .R and R' are alkyl groups
    • Ethers are commonly used as solvents in various industries, including pharmaceuticals, paints, and coatings.
    • Ethers are less reactive than alcohols, aldehydes, and ketones because the C-O bond is relatively stable.

Additional Information

  • Alcohol:-
    • A class of organic compounds that contains a hydroxyl (-OH) group attached to a carbon atom.
    • They are commonly used as solvents, disinfectants, and fuels.
  • Aldehyde:-
    • A class of organic compounds that contains a carbonyl group (-COH) attached to a carbon atom at the end of the molecule.
    • They are commonly used in the production of plastics, resins, and dyes.
  • Ketone:-
    • A class of organic compounds that contains a carbonyl group (-C=O) attached to a carbon atom in the middle of the molecule.
    • They are commonly used in the production of solvents, polymers, and pharmaceuticals.

." }}},{"@type": "Question","typicalAgeRange": "4-35","educationalLevel": "intermediate","eduQuestionType": "Multiple choice","learningResourceType": "Practice problem","name": "Recollect the concept of Indian Army Agniveer Technical Mock Test - 3 to solve the ques", "comment": { "@type": "Comment", "text": "Which one among the following are the correct symbols for the elements gold, tin and lead, respectively?" },"encodingFormat": "text/html","text": "Which one among the following are the correct symbols for the elements gold, tin and lead, respectively?","suggestedAnswer": [{ "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "Ga, Sb, Pb", "comment": { "@type": "Comment", "text": "Which one among the following are the correct symbols for the elements gold, tin and lead, respectively?" }},{ "@type": "Answer", "position": 1, "encodingFormat": "text/html", "text": "At, Sn, Le", "comment": { "@type": "Comment", "text": "Which one among the following are the correct symbols for the elements gold, tin and lead, respectively?" }},{ "@type": "Answer", "position": 2, "encodingFormat": "text/html", "text": "Au, Sn, Pb", "comment": { "@type": "Comment", "text": "Which one among the following are the correct symbols for the elements gold, tin and lead, respectively?" }},{ "@type": "Answer", "position": 3, "encodingFormat": "text/html", "text": "Au, Sb, Pb", "comment": { "@type": "Comment", "text": "Which one among the following are the correct symbols for the elements gold, tin and lead, respectively?" }}],"acceptedAnswer": { "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "C", "comment": { "@type": "Comment", "text": "Which one among the following are the correct symbols for the elements gold, tin and lead, respectively?" }, "answerExplanation": { "@type": "Comment", "text": "

The correct answer is Au, Sn, Pb.

Key Points

  • Gold (Au):
    • Gold is a transition metal with the chemical symbol Au, which is derived from the Latin word 'aurum'.
    • Its atomic number in the periodic table is 79 and it is known for its distinctive yellow color, ductility and high conductivity.
  • Tin (Sn):
    • Tin is a transition metal with the chemical symbol Sn, which is derived from the Latin word 'stannum'.
    • Its atomic number is 50 and it is commonly used in the production of alloys such as bronze and solder.
  • Lead (Pb):
    • Lead is also a transition metal with the chemical symbol Pb, which is derived from the Latin word 'plumbum'.
    • Its atomic number is 82 and it is known for its dense and flexible properties.

Additional Information

  • Gallium
    • It has the symbol Ga.
    • Atomic number 31.
  • Astatine
    • It has the symbol At
    • Atomic number 85.
  • Antimony
    • It has the symbol Sb
    • Atomic number 51.

." }}},{"@type": "Question","typicalAgeRange": "4-35","educationalLevel": "intermediate","eduQuestionType": "Multiple choice","learningResourceType": "Practice problem","name": "Recollect the concept of Indian Army Agniveer Technical Mock Test - 3 to solve the ques", "comment": { "@type": "Comment", "text": "

Which one among the following contains the most neutrons?

" },"encodingFormat": "text/html","text": "

Which one among the following contains the most neutrons?

","suggestedAnswer": [{ "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (5)

", "comment": { "@type": "Comment", "text": "

Which one among the following contains the most neutrons?

" }},{ "@type": "Answer", "position": 1, "encodingFormat": "text/html", "text": "

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (6)

", "comment": { "@type": "Comment", "text": "

Which one among the following contains the most neutrons?

" }},{ "@type": "Answer", "position": 2, "encodingFormat": "text/html", "text": "

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (7)

", "comment": { "@type": "Comment", "text": "

Which one among the following contains the most neutrons?

" }},{ "@type": "Answer", "position": 3, "encodingFormat": "text/html", "text": "

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (8)

", "comment": { "@type": "Comment", "text": "

Which one among the following contains the most neutrons?

" }}],"acceptedAnswer": { "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "a", "comment": { "@type": "Comment", "text": "

Which one among the following contains the most neutrons?

" }, "answerExplanation": { "@type": "Comment", "text": "

The correct answer is Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (9)

Key Points

The number of neutrons in an atom can be calculated by subtracting the atomic number (number of protons) from the mass number (total number of protons and neutrons). Let's calculate the number of neutrons for each of the given isotopes:

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (10)
Atomic number (protons) = 26
Mass number (protons + neutrons) = 59
Number of neutrons = Mass number - Atomic number = 59 - 26 = 33 neutrons

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (11)
Atomic number (protons) = 29
Mass number (protons + neutrons) = 61
Number of neutrons = Mass number - Atomic number = 61 - 29 = 32 neutrons

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (12)
Atomic number (protons) = 30
Mass number (protons + neutrons) = 61
Number of neutrons = Mass number - Atomic number = 61 - 30 = 31 neutrons

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (13)
The given ion is Zn2+, which means it has lost 2 electrons compared to a neutral zinc atom. However, the number of protons and neutrons remains the same as in a neutral atom.
Atomic number (protons) = 30
Mass number (protons + neutrons) = 60
Number of neutrons = Mass number - Atomic number = 60 - 30 = 30 neutrons

Among the options given, the isotope with the most neutrons is Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (14) with 33 neutrons.

." }}},{"@type": "Question","typicalAgeRange": "4-35","educationalLevel": "intermediate","eduQuestionType": "Multiple choice","learningResourceType": "Practice problem","name": "Recollect the concept of Indian Army Agniveer Technical Mock Test - 3 to solve the ques", "comment": { "@type": "Comment", "text": "Which of the following is NOT a physical change?" },"encodingFormat": "text/html","text": "Which of the following is NOT a physical change?","suggestedAnswer": [{ "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "Liquefaction of gases to liquids", "comment": { "@type": "Comment", "text": "Which of the following is NOT a physical change?" }},{ "@type": "Answer", "position": 1, "encodingFormat": "text/html", "text": "Fermentation of substances", "comment": { "@type": "Comment", "text": "Which of the following is NOT a physical change?" }},{ "@type": "Answer", "position": 2, "encodingFormat": "text/html", "text": "Vaporisation of liquids to gases", "comment": { "@type": "Comment", "text": "Which of the following is NOT a physical change?" }},{ "@type": "Answer", "position": 3, "encodingFormat": "text/html", "text": "Melting of solids to liquids", "comment": { "@type": "Comment", "text": "Which of the following is NOT a physical change?" }}],"acceptedAnswer": { "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "B", "comment": { "@type": "Comment", "text": "Which of the following is NOT a physical change?" }, "answerExplanation": { "@type": "Comment", "text": "

The Correct Answer is Option 2.: Fermentation of Substances

  • Liquefaction of gases is the process of converting gas into a liquid state.
    • Example: Storage of LPG under high pressure.
  • Fermentation: It is the chemical change in which a substance breaks down into a simpler substance.
    • Alcohol creation is an example of fermentation
  • Vaporization:
    • The process in which a liquid substance changes into a gas state by rapid heating is called vaporization.
  • Melting: It is a physical process in which the substance of solid changes into a liquid.
    • Ice melting into water is an example of this conversion.

." }}},{"@type": "Question","typicalAgeRange": "4-35","educationalLevel": "intermediate","eduQuestionType": "Multiple choice","learningResourceType": "Practice problem","name": "Recollect the concept of Indian Army Agniveer Technical Mock Test - 3 to solve the ques", "comment": { "@type": "Comment", "text": "

Which of the following is the isotone of 32Ge76

" },"encodingFormat": "text/html","text": "

Which of the following is the isotone of 32Ge76

","suggestedAnswer": [{ "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "

32Ge77

", "comment": { "@type": "Comment", "text": "

Which of the following is the isotone of 32Ge76

" }},{ "@type": "Answer", "position": 1, "encodingFormat": "text/html", "text": "

33As77

", "comment": { "@type": "Comment", "text": "

Which of the following is the isotone of 32Ge76

" }},{ "@type": "Answer", "position": 2, "encodingFormat": "text/html", "text": "

36Sc78

", "comment": { "@type": "Comment", "text": "

Which of the following is the isotone of 32Ge76

" }},{ "@type": "Answer", "position": 3, "encodingFormat": "text/html", "text": "

34Sc77

", "comment": { "@type": "Comment", "text": "

Which of the following is the isotone of 32Ge76

" }}],"acceptedAnswer": { "@type": "Answer", "position": 1, "encodingFormat": "text/html", "text": "b", "comment": { "@type": "Comment", "text": "

Which of the following is the isotone of 32Ge76

" }, "answerExplanation": { "@type": "Comment", "text": "

The correct answer is 33As77

Concept-:

  • The total number of electrons (or protons) in a neutral atom is called its atomic number, denoted by Z.
  • The total number of protons and neutrons in the nucleus of an atom is known as its Mass Number and is denoted by A.

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (15)
Explanation:

The number of neutrons is calculated by the difference in M-A.

  • The number of neutrons in 32Ge76 is
    76-32 = 44​
  • The number of neutrons in 32Ge77 is
    77 - 32 = 45
  • The number of neutrons in 33As77 is
    77 - 33 = 44
  • The number of neutrons in 36Sc78 is:
    78-36 = 42
  • The number of neutrons in 34Sc77 is:
    77 - 34 = 43
  • We see that the number of neutrons is the same in 32Ge76 and 33As77 and thus they are isotones.

Hence, the isotone of 32Ge76 is 33As77.

." }}},{"@type": "Question","typicalAgeRange": "4-35","educationalLevel": "intermediate","eduQuestionType": "Multiple choice","learningResourceType": "Practice problem","name": "Recollect the concept of Indian Army Agniveer Technical Mock Test - 3 to solve the ques", "comment": { "@type": "Comment", "text": "Which one of the following correctly represents metals in decreasing order of reactivity?" },"encodingFormat": "text/html","text": "Which one of the following correctly represents metals in decreasing order of reactivity?","suggestedAnswer": [{ "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "Al > Zn > Fe > Cu", "comment": { "@type": "Comment", "text": "Which one of the following correctly represents metals in decreasing order of reactivity?" }},{ "@type": "Answer", "position": 1, "encodingFormat": "text/html", "text": "Cu> Fe> Zn > Al", "comment": { "@type": "Comment", "text": "Which one of the following correctly represents metals in decreasing order of reactivity?" }},{ "@type": "Answer", "position": 2, "encodingFormat": "text/html", "text": "Zn > Al > Cu > Fe", "comment": { "@type": "Comment", "text": "Which one of the following correctly represents metals in decreasing order of reactivity?" }},{ "@type": "Answer", "position": 3, "encodingFormat": "text/html", "text": "Fe > Zn > Cu > Al", "comment": { "@type": "Comment", "text": "Which one of the following correctly represents metals in decreasing order of reactivity?" }}],"acceptedAnswer": { "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "A", "comment": { "@type": "Comment", "text": "Which one of the following correctly represents metals in decreasing order of reactivity?" }, "answerExplanation": { "@type": "Comment", "text": "

The Correct answer is Al > Zn > Fe > Cu.

Explanation:

  • The Reactivity series of metals refers to the arrangement of metals in the descending order of their reactivities.
  • ​Features of the Reactivity series:
    • The metals at the top of the reactivity series are powerful reducing agents since they are easily oxidized and get corroded very easily.
    • The reducing ability of the metals grows weaker while traversing down the series.
    • The electro-positivity of the elements also reduces while moving down the reactivity series of metals.
    • All metals that are found above hydrogen in the activity series liberate H2 gas upon reacting with dilute HCl or dilute H2SO4.
    • Metals that are placed higher on the reactivity series have the ability to displace metals that are placed lower from their salt solutions.

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (16)

So, the correct representation of metals in decreasing order of reactivity is Al > Zn > Fe > Cu.

." }}},{"@type": "Question","typicalAgeRange": "4-35","educationalLevel": "intermediate","eduQuestionType": "Multiple choice","learningResourceType": "Practice problem","name": "Recollect the concept of Indian Army Agniveer Technical Mock Test - 3 to solve the ques", "comment": { "@type": "Comment", "text": "Which gas is used to extinguish a fire?" },"encodingFormat": "text/html","text": "Which gas is used to extinguish a fire?","suggestedAnswer": [{ "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "Nitrogen", "comment": { "@type": "Comment", "text": "Which gas is used to extinguish a fire?" }},{ "@type": "Answer", "position": 1, "encodingFormat": "text/html", "text": "Oxygen", "comment": { "@type": "Comment", "text": "Which gas is used to extinguish a fire?" }},{ "@type": "Answer", "position": 2, "encodingFormat": "text/html", "text": "Carbon dioxide", "comment": { "@type": "Comment", "text": "Which gas is used to extinguish a fire?" }},{ "@type": "Answer", "position": 3, "encodingFormat": "text/html", "text": "Argon", "comment": { "@type": "Comment", "text": "Which gas is used to extinguish a fire?" }}],"acceptedAnswer": { "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "C", "comment": { "@type": "Comment", "text": "Which gas is used to extinguish a fire?" }, "answerExplanation": { "@type": "Comment", "text": "

The correct answer is Carbon dioxide.

Key Points

  • Carbon dioxide
    • Carbon dioxide extinguishers work by displacing oxygen or taking away the oxygen element of the fire triangle.
    • The carbon dioxide is also very cold as it comes out of the extinguisher, so it cools the fuel as well.
    • It is because carbon dioxide does not support combustion.
    • When sprayed on the burning object it stops the supply of oxygen and extinguishes fire.
    • Carbon dioxide is the most commonly used gas for extinguishing fires. Hence, Option 3 is correct.
    • Sodium bicarbonate is used to release a cloud of Co2, especially in class A and class B fires, thus releasing the oxygen and smothering the fire
    • Carbon dioxide is an acidic colorless gas with a density about 53% higher than that of dry air. Carbon dioxide molecules consist of a carbon atom covalently double bonded to two oxygen atoms. It occurs naturally in Earth's atmosphere as a trace gas.
    • Molar mass: 44.01 g/mol
    • Formula: CO2
    • Boiling point: -78.46 °C
    • Soluble in: Wate

Additional Information

  • Nitrogen
    • It is the chemical element with the symbol N and atomic number 7. It was first discovered and isolated by Scottish physician Daniel Rutherford in 1772.
    • Symbol: N
    • Atomic mass: 14.0067 u
    • Atomic number: 7
    • Electron configuration: [He] 2s22p3
    • Electronegativity: 3.04
    • Boiling point: -195.8 °C
  • Oxygen
    • It is the chemical element with the symbol O and atomic number 8.
    • It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds.
    • Symbol: O
    • Atomic mass: 15.999 u
    • Atomic number: 8
    • Electron configuration: [He] 2s²2p⁴
    • Electronegativity: 3.44
    • Discoverers: Joseph Priestley, Antoine Lavoisier, Carl Wilhelm Scheele
  • Argon
    • It is a chemical element with the symbol Ar and atomic number 18.
    • It is in group 18 of the periodic table and is a noble gas. Argon is the third-most abundant gas in the Earth's atmosphere, at 0.934%.
    • Symbol: Ar
    • Atomic mass: 39.948 u
    • Atomic number: 18
    • Electron configuration: [Ne] 3s²3p⁶
    • Boiling point: -185.8 °C
    • Discoverers: William Ramsay, John William Strutt, 3rd Baron Rayleigh

." }}},{"@type": "Question","typicalAgeRange": "4-35","educationalLevel": "intermediate","eduQuestionType": "Multiple choice","learningResourceType": "Practice problem","name": "Recollect the concept of Indian Army Agniveer Technical Mock Test - 3 to solve the ques", "comment": { "@type": "Comment", "text": "Stainless steel is very useful material for our life. In stainless steel, iron is mixed with" },"encodingFormat": "text/html","text": "Stainless steel is very useful material for our life. In stainless steel, iron is mixed with","suggestedAnswer": [{ "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "Ni and Cr", "comment": { "@type": "Comment", "text": "Stainless steel is very useful material for our life. In stainless steel, iron is mixed with" }},{ "@type": "Answer", "position": 1, "encodingFormat": "text/html", "text": "Cu and Cr", "comment": { "@type": "Comment", "text": "Stainless steel is very useful material for our life. In stainless steel, iron is mixed with" }},{ "@type": "Answer", "position": 2, "encodingFormat": "text/html", "text": "Ni and Cu", "comment": { "@type": "Comment", "text": "Stainless steel is very useful material for our life. In stainless steel, iron is mixed with" }},{ "@type": "Answer", "position": 3, "encodingFormat": "text/html", "text": "Cu and Au", "comment": { "@type": "Comment", "text": "Stainless steel is very useful material for our life. In stainless steel, iron is mixed with" }}],"acceptedAnswer": { "@type": "Answer", "position": 0, "encodingFormat": "text/html", "text": "A", "comment": { "@type": "Comment", "text": "Stainless steel is very useful material for our life. In stainless steel, iron is mixed with" }, "answerExplanation": { "@type": "Comment", "text": "

Concept:

  • Alloys are the uniform mixtures of two or more metals along with the traces of non-metals.
  • They come under the class of hom*ogeneous mixtures.
  • Various alloys are used in different ways in daily life.

Explanation:

  • Stainless steel is an iron alloy. It is used in making vessels for cooking in homes.
  • Used to make cutlery.
  • Also used to make heavy containers that are useful in industries.
  • In making tooth protective crowns.
  • In making surgical apparatus.
  • This stainless steel has more advantages compared to iron.
  • It is rust-free. Light in weight compared to iron. It has high durability and is long-lasting.

Stainless steel is a hom*ogenous mixture of metals: Fe+, Ni+ Cr+ with very less amount of carbon.

." }}}] }]

Indian Army Agniveer Exam>Indian Army Agniveer Tests>Indian Army Agniveer Technical Mock Test - 3 - Indian Army Agniveer MCQ


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50 Questions MCQ Test - Indian Army Agniveer Technical Mock Test - 3

Indian Army Agniveer Technical Mock Test - 3 for Indian Army Agniveer 2024 is part of Indian Army Agniveer preparation. The Indian Army Agniveer Technical Mock Test - 3 questions and answers have been prepared according to the Indian Army Agniveer exam syllabus.The Indian Army Agniveer Technical Mock Test - 3 MCQs are made for Indian Army Agniveer 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Indian Army Agniveer Technical Mock Test - 3 below.

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Indian Army Agniveer Technical Mock Test - 3 - Question 1

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The 1972 Simla Agreement was signed between

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 1

The correct answer is India and Pakistan.

Key Points

  • On the day of 02 July 1972, Shimla Agreement was signed between Indira Gandhi and Zulfiqar Ali Bhutto at Shimla of Himachal Pradesh.
  • It was signed 8 months after the Indo-Pakistani war of 1971, which led to the splitting of Pakistan and the consequent creation of Bangladesh had ended.
  • Any differences shall be settled by peaceful means and through bilateral negotiations.
  • Both countries shall respect the territorial integrity of each other and not interfere in the internal matters of each other.
  • The treaty also had some other terms like renewing communications, telegraph, postal, airline relations, etc. It also talked about having exchanges in the field of culture and science.
  • India released 93000 Pakistani prisoners of war (POWs) who were captured after the Bangladesh war.
  • It was a peace treaty signed after the Bangladesh Liberation War in 1971.
  • The agreement converted the cease-fire line of December 17, 1971, into the ‘Line of Control (LOC)’ between India and Pakistan and it was agreed that “neither side shall seek to alter it unilaterally, irrespective of mutual differences and legal interpretations”.

Indian Army Agniveer Technical Mock Test - 3 - Question 2

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Black soil, found in the Deccan Traps is considered highly suitable for the cultivation of ________ crops.

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 2

The correct answer is cotton.

Key Points

  • Black soil
    • It has occasionally been referred to as "regur," a word derived from the Telegu word "Regada." This soil is a product of the erosion of basalt from the Deccan Highlands.
    • Black soil, with its clayey characteristics, is crucial for growing cotton. High moisture retention is necessary for cotton farming.
    • Black soils are very fine-grained, black, and very argillaceous. They also contain high amounts of magnesium and calcium carbonates. They are extremely sticky and tenacious of moisture when wet.
    • They also have fair amounts of lime, magnesia, and alumina, as well as a significant abundance of iron.
    • Because this soil is most suited for the cotton crop, it is primarily referred to as black cotton soil.

Additional Information

  • Black soil is also good for growing crops including peanuts, wheat, tobacco, chilies, and jowar in addition to cotton.
  • Organic matter, phosphorous, and nitrogen are insufficient in black soils.
  • The beidellitic and montmorillonitic classes of clay minerals are often abundant in the soils.
  • It is located in the Deccan trap and lava plateaus which reach south-east along the Godavari and Krishna basins and include the plateaus of Malwa, Maharashtra, Saurashtra, Chattisgarh, and Madhya Pradesh.​

Indian Army Agniveer Technical Mock Test - 3 - Question 3

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James Webb Space Telescope’s development was done by NASA in collaboration with which two Space agencies?

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 3

The correct answer is European Space Agency and Canadian Space Agency.

Key Points

  • The James Webb Space Telescope
    • It is the world's largest and most powerful space telescope.
    • It was constructed by aerospace giant Northrop Grumman Corp and was launched to space for NASA and its European and Canadian counterparts in December 2021 from French Guiana.
  • The National Aeronautics and Space Administration (NASA) led the development of James Webb Space Telescope in collaboration with the European Space Agency and Canadian Space Agency.
  • The James Webb Space Telescope was launched on December 25, 2021, from Kourou, French Guiana. It arrived at the Sun-Earth L2 Lagrange Point in January 2022.

Additional Information

  • James Webb Space Telescope:
    • James Webb Space Telescope showed the most detailed images of the universe that mankind has ever seen.
    • After James Webb Space Telescope shared the stunning visuals, it has now sent new images that were taken in our solar system.
    • The images are of the largest planet in our solar system, Jupiter, and its moon.
    • NASA’s James Webb Space Telescope is primarily designed to conduct infrared astronomy that is expected to enable a broad range of investigations across the fields of astronomy and cosmology.

Indian Army Agniveer Technical Mock Test - 3 - Question 4

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When and where did Subhash Chandra Bose establish the 'Provisional Government of Free India' ?

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 4

The correct answer is 1943, Singapore.

Key Points

  • Subhash Chandra Bose established the 'Provisional Government of Free India' in Singapore in the year 1943.
  • On July 4, 1943, Rash Behari Bose handed over the command of Azad Hind Fauj to Subhash Chandra Bose in a ceremony held at Cathay Bhawan, Singapore.
  • The Azad Hind government was established on 21 October 1943.
  • Japan recognized the Azad Hind government on 23 October 1943.
  • Japan gave Andaman and Nicobar Islands to Azad Hind Government.
  • Subhash Chandra Bose renamed Andaman as Shaheed Dweep and Nicobar as Swaraj Dweep.
  • Subhash Chandra Bose was the Prime Minister, Foreign Minister and Defense Minister of India's first independent government.
  • Finance Department to S.C. Chatterjee, Publicity Department to S.A. Iyer and the women's organization was handed over to Captain Lakshmi Swaminathan.
  • The governments of 9 countries had given their recognition to the Azad Hind government, in which countries like Germany, Japan, Philippines were included.

Indian Army Agniveer Technical Mock Test - 3 - Question 5

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A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.

AMRP, ERXW, IWDD, MBJK, ?

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 5

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (22)

The logic followed here is:​

  • The 1st alphabet is increased by +4.
  • The 2nd alphabet is increased by +5.
  • The 3rd alphabet is increased by +6.
  • The 4th alphabet is increased by +7.

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (23)

Hence, the correct answer is "QGPR".

Indian Army Agniveer Technical Mock Test - 3 - Question 6

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Which of the following is a tidal port?

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 6

The correct answer is Kandla.

Key Points:

  • Kandla is a tidal port, acknowledged as a Trade Free Zone, the largest port by volume of cargo handled.
    • Kandla, officially Deendayal Port, is a port and city in Kutch district in the state of Gujarat in western India, near the city of Gandhidham.
    • Situated on the Gulf of Kutch, it is one of the major ports of India on the west coast.
    • It is approximately 256 nautical miles southeast of Karachi port in Pakistan and about 430 nautical miles north-northwest of Mumbai port.
    • The Kandla port was constructed in the 1950s as the main port serving western India.

Additional Information

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (25)

Indian Army Agniveer Technical Mock Test - 3 - Question 7

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How many animals are seen in India’s national emblem?

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 7

The correct answer is 4.

Key Points

  • The National Emblem of India was adopted on 26 January 1950.
  • It is inspired by the Lion Capital of Ashoka which is a statue from 250 BCE situated at Sarnath.
  • The animals demonstrated on the pillar are horse, bull, elephant, and lion.
  • The elephant denotes Buddha’s outset (the dream of a white elephant entering her womb dreamt by Buddha’s mother at the time of Buddha’s conception).
  • The bull symbolizes the Zodiac sign of Buddha- Taurus.
  • The horse signifies Buddha’s horse which he rode at the time of departing from the citadel.
  • The lion indicates enlightenment.
  • The Emblem is the part of the official letterhead of all the papers of the Government of India and also appears in the Indian currency.
  • It can be seen in many Indian places and on Indian passports as well.
  • Ashok Chakra on its base has been used as the center of the National Flag of India.

Indian Army Agniveer Technical Mock Test - 3 - Question 8

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One morning Raghav met Bhaskar while walking in the park. Bhaskar noted that Raghav's shadow was exactly to the left of Raghav. If they were facing each other, which direction was Raghav facing?

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 8

One morning Raghav met Bhaskar while walking in the park. Bhaskar noted that Raghav's shadow was exactly to the left of Raghav.

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (28)

So, 'North' direction was Raghav is facing.

Hence, 'North' is the correct answer.

Indian Army Agniveer Technical Mock Test - 3 - Question 9

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Select the figure that will come next in the following figure series.

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (30)

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 9

The figure that will replace the question mark (?) in the following figure series is shown below:

1) For 'Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (35)' element :

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (36)

2) For 'Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (37)' element :

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (38)

3) For 'Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (39)' element :

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (40)

4) For 'Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (41)' element :

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (42)

5) For 'Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (43)' element : Rotating in the anti-clockwise direction.

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (44)

​​

Final series is :

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (45)

Hence, ‘option - (1)’ is the correct answer.

Indian Army Agniveer Technical Mock Test - 3 - Question 10

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Which of the following letter-clusters will replace the question mark (?) in the given series?

DBK, GDL, JFM, MHN, ?

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 10

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (47)

The logic followed here is :-

  1. First letter → (3) is added to the position value according to the English alphabetic series.
  2. Second letter → (2) is added to the position value according to the English alphabetic series.
  3. Third letter → (1) is added to the position value according to the English alphabetic series.

​​So,

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (48)

Hence, the correct answer is "PJO".

Indian Army Agniveer Technical Mock Test - 3 - Question 11

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Let {x} denotes the fractional part of a real number x. Then Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (50)

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 11

Explanation:

Given, I=∫02{x}dx

where, {x} denotes the fractional part of a real number x.

We know that {x} = x - [x]; where [x] denotes the floor of x, greatest integer less than or equal to x.

Now, Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (51)

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (52)

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (53)

Between 0 and 1, [x]=0 and between 1 and 2, [x]=1

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (54)

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (55)

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (56)

⇒ I = 1

Indian Army Agniveer Technical Mock Test - 3 - Question 12

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What is the value of Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (58)?

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 12

Concept Used:

1° = π/180 radians

and Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (61)

Calculation:

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (62)

limx→0sin⁡x∘x=limx→0sin⁡πx180x

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (63)

Indian Army Agniveer Technical Mock Test - 3 - Question 13

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Anu is four times as good as Binni at doing a work. Together they finish the same work in 12 hours. In how many hours will Anu alone finish the work?

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 13

Given:

Efficiency of Anu = 4 × Efficiency of Binni

They finish a work in 12 hours together.

Concept used:

Total work = Efficiency of the workers × Time taken by them

Calculation:

Let, the efficiency of Binny be m.

So, the efficiency of Anu = 4m

Effective efficiency of them = m + 4m = 5m

Total work = 12 × 5m = 60m

Now, the time taken by Anu to finish the work = 60m/4m = 15 hours

∴ In 15 hours Anu will finish the work alone.

Indian Army Agniveer Technical Mock Test - 3 - Question 14

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The solution of the differential equation Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (66)is (where C is an arbitrary constant)

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 14

Given:

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (71)

Concept:

To solve such type of differential equations, simply put y = vx.

Calculation:

Putting y = vx

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (72)

Now, Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (73)

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (74)Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (75)

⇒ f′(v)f(v)dv = Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (76)

Integrating both sides -

⇒ ln|f(v)| = ln|x| + lnC

⇒ f(v) = Cx

putting v = y/x back,

⇒ f(y/x) = Cx

Indian Army Agniveer Technical Mock Test - 3 - Question 15

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What is the volume of a sphere whose surface area is 124.74 cm2?

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 15

Given:

Surface area is 124.74 cm2

Formula Used:

Total Surface area of sphere = 4 π r2

Volume of sphere = (4/3)π r3

Radius of sphere = r

Calculation:

Total Surface area of sphere = 4 π r2

4 π r2 = 124.74

⇒ r = √(124.74 × 7/88)

⇒ r = 3.15

According to the question,

Volume of sphere = (4/3)π r3

⇒ (4/3) π × (3.15)3

130.977 cm3

∴ The volume of sphere is 130.977 cm3

Indian Army Agniveer Technical Mock Test - 3 - Question 16

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What is Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (79)2r C(n, r) equal to ?

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 16

Concept:

Binomial expansion of (x + y)n is given by

(x + y)n = nC0xn + nC1xn-1y + nC2xn-2y2+.....+ nCn-1xyn-1 + nCnyn

Calculation:

Given, ∑r=0n2r C(n, r)

Expanding the expression,

⇒ nC020 + nC1 21 + nC222+.....+ nCn-12n-1 + nCn2n

⇒ nC01n 20 + nC1 1n-1 21 + nC21n-2 22+.....+ nCn-1 2n-1 + nCn2n

Comparing with binomial expansion x = 1 and y = 2

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (80)2r C(n, r) = (1 + 2)n

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (81)2r C(n, r) = 3n

∴ The correct option is (2).

Indian Army Agniveer Technical Mock Test - 3 - Question 17

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Solution of the differential equation cos x dy = y (sin x - y) dx, 0 < xIndian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (83)is

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 17

Concept:

Equation of the formIndian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (84)solve by following the steps

  1. find I.Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (85)
  2. The solution will be y I.F = ∫ Q I.F dx + C

Formula used:

1. sin θ/cos θ = tan θ 2.1/cos θ = sec θ

3. eln x = x 4. ∫ sec2 x = tan x

Calculation:

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (86)
Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (87)

∴ The solution of an equation is sec x = (tan x + c)y.

Indian Army Agniveer Technical Mock Test - 3 - Question 18

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A train of length 850 m which travels at a speed of 162 kmph crosses a Tunnel in 63 seconds. Find the length of the Tunnel? (In metres)

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 18

Given:

A train of length 850 m which travels at a speed of 162 kmph crosses a Tunnel in 63 seconds.

Formula used:

Speed = Distance / Time

Concept used:

Conversion of kmph to m/s = 1 × (5/18)

Calculations:

Conversion of 162 kmph to m/s = 162 × (5/18)= 45 m/s

Now, let the length of the tunnel be x

According to the question,

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (89)

⇒ 45 × 63 = 850 + x

⇒ 2835 = 850 + x

⇒ x = 2835 - 850

⇒ x = 1985

∴ The answer is 1985 m.

Indian Army Agniveer Technical Mock Test - 3 - Question 19

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The solution of the given system of equations, x - y = -1 and 2x - 7y = 3, is

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 19

Given:

x - y = -1 and 2x - 7y = 3

Calculation:

x - y = -1

⇒ 2x - 2y = -2 ----(1)

2x - 7y = 3 ------(2)

On subtracting (1) from (2), weget

⇒ -5y = 5

⇒ y = -1

So, x = -1 + y = -1 -1 = -2

∴The answer is x = -2, y = -1 .

Indian Army Agniveer Technical Mock Test - 3 - Question 20

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The maximum sum of the series Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (92)is

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 20

Concept:

If first terms and common difference of AP are 'a' and 'd' respectively, then

nth term of Ap:

Tn = a + (n - 1)d

Sum of n terms of AP:

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (93)

Note: If d > 0, AP will be increasing and d < 0, AP will be decreasing.

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (94)

Therefore, this is the decreasing series and sum will be maximum if its last term is positive or zero.

Let there are n positive terms, where Tn is nth term then

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (95)

Hence, we will take 31 terms for maximum sum.

Hence, sum of 31 terms of AP is given by

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (96)

Hence, option 2 will be correct.

Indian Army Agniveer Technical Mock Test - 3 - Question 21

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Two persons are standing on either side of a 1200 m long bridge, if they walk towards each other at the speed of 5 m/min and 10 m/min respectively, in how much time will they meet?

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 21

Given:

The length of the bridge = 1200 m

Concept used:

If two men running in the opposite direction then their speeds are added.

Time = Distance/Speed

Calculation:

According to the above concept,

The speed of two men = (5 + 10) m/min = 15 m/min

Now, Time = Distance/Speed

⇒ Time = 1200/15= 80 min

∴ The required time is 80 min.

Indian Army Agniveer Technical Mock Test - 3 - Question 22

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If Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (99), then the value of x is

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 22

Concept:

The value of the determinant Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (100)can be obtained by expanding along any row or column.

Expanding along the third column, the value of the determinant is

c(dh - eg) - f(ah - bg) + i(ae - bd)

Calculation:

Given, Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (101)

Expanding LHS along column 3,

⇒ 0(x2 + 2x + 2- 2) - 0(1 - 2) + 1(1 - (x2 + 2x + 2)) = 0

⇒ 0 + 0 - x2 - 2x - 1 = 0

⇒ x2 + 2x + 1 = 0

⇒ (x + 1)2 = 0

∴ x = -1

Indian Army Agniveer Technical Mock Test - 3 - Question 23

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If x = 2t and y = 2t2, then what is Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (103)?

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 23

Concept Used:
for parametric curves Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (105), where t is the parameter.

Calculation:\

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (106)= 2

y =Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (107)Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (108)= 4t

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (109)

Indian Army Agniveer Technical Mock Test - 3 - Question 24

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For the function f(x) = x + Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (111), x ∈ [1, 3], the value of c for mean value theorem is

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 24

Concept:

Mean value theorem states that if f(x)is continuous over the interval [a, b] and differentiable over the interval(a, b) then there exists at least one c in (a, b) such that
Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (112)
The mean value theorem statesthere exists at least one c in (a, b) such that
Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (113)
Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (114)

Indian Army Agniveer Technical Mock Test - 3 - Question 25

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What is the maximum value of 3(sin x − cos x) + 4(cos3 x − sin3 x) ?

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 25

Concept:

  • sin3x = 3sinx - 4sin3x
  • cos3x = 4cos3x - 3cosx

Calculation:

f(x) = 3(sin x − cos x) + 4(cos3 x − sin3 x)

f(x) = 3sinx - 3cosx + 4cos3x - 4sin3x

f(x) = (3sinx - 4sin3x) + (4cos3x - 3cosx)

f(x) = sin3x + cos3x

f'(x) = 3cos3x - 3sin3x

Now, f'(x) = 0

3cos3x - 3sin3x = 0

⇒ cos3x - sin3x = 0

⇒ sin3x = cos3x

⇒ tan3x = 1

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (118)

Hence, the maximum value of given function is = Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (119)

= 12+12=2

∴ The correct option is (2)

Indian Army Agniveer Technical Mock Test - 3 - Question 26

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Which among the following does not possess kinetic energy?

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 26

Correct answer is battery

Key Point

CONCEPT:

  • Kinetic energy (KE): The energy possessed by a body by virtue of its motion is called kinetic energy.

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (121)

Where m = mass of the body and v = velocity of the body

EXPLANATION:

  • A ball thrown upwards has some velocity so it has kinetic energy.
  • A battery is always at rest. It doesn't possess kinetic energy. The battery has chemical energy inside it.
  • A moving car has some velocity so it possesses kinetic energy.
  • A flying bird also has some speed. So possess kinetic energy.

Indian Army Agniveer Technical Mock Test - 3 - Question 27

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Which of the following quantities is not a vector?

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 27

The correct answer is Volume.

Key Points

  • Vector:-
    • A vector is a quantity that has both a magnitude and a direction and obeys the triangle law of addition or equivalently the parallelogram law of addition.
    • Some physical quantities that are represented by vectors are displacement, velocity, acceleration, and force.
  • Volume:-
    • Volume is the amount of space occupied by an object.
    • Volume is not a vector quantity as it does not talk about direction but only about magnitude.

Additional Information

  • Displacement:-
    • It is the shortest distance measured from the initial to the final position of an object.
    • It is a vector quantity.
  • Velocity:-
    • Velocity is the speed of an object moving in a definite direction.
    • It can be uniform or variable.
    • It is a vector quantity.
  • Force:-
    • In science, a push or pull on an object is called force.
    • Force is a vector quantity.
    • There are various types of forces:-
      • Muscular Force
      • Friction
      • Magnetic Force
      • Electrostatic Force
      • Gravitational Force

Indian Army Agniveer Technical Mock Test - 3 - Question 28

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The power generated when 2.5 A current flows through a resistor of resistance 10 ohm is:

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 28

correct answer is 62.5 W

Key Points

Concept:

The power consumed by a device s given as, P = VI = I2R

where, V = voltage, R = resistance, I = current

Calculation:

Given:

Current (I) = 2.5 A, Resistance (R) = 10 ohm

Power (P) = VI = I2R = (2.5)2 × 10 = 62.5W

Indian Army Agniveer Technical Mock Test - 3 - Question 29

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Magnitude of displacement in one second is called:

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 29

The correct answer is Speed.

Explanation:

Speed:

  • Speed is given by the distance covered by an object per unit of time.
  • The magnitude of displacement in one second is called speed.
  • Speed measures how fast the body is moving.

speed= total distance /total time

  • The S.I unit of speed is m/s.

Additional Information

Acceleration

  • It is a rate of change of velocity with respect to time.
  • Acceleration is a vector quantity, SI unit is ms-2, and dimension [LT-2].
  • Acceleration is represented by the slope of the velocity-time curve.

Momentum

  • Momentum is defined as the quantity of motion of the body.
  • Momentum has both direction and magnitude.
  • Its direction is the same as that of velocity, v.
  • The SI unit of momentum is kilogram-meter per second (kg m s-1).

Force

  • A push or a pull on an object is called a force.
  • The SI unit of Force is Newton or kg ms-2.
  • It is represented by the symbol N.

Indian Army Agniveer Technical Mock Test - 3 - Question 30

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Which of the following methods is used to calculate a large distance such as between our planet and a star?

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 30

The correct answer is Parallax method.

Key Points

  • Parallax:
    • It ​is the apparent movement or change in the position of an object when seen from two different angles.
      • ​The two points of view have their line of sight, and parallax is measured as half of the angle between the two lines of sight.
    • ​​Instead of measuring distances directly, triangulation involves calculating the angles between two known points and a point to be located.
      • ​Distance measurement by parallax is a special application of the principle of triangulation.
    • ​​The distance of a planet or a star from the earth cannot be measured directly with a metre scale.
      • An important method in such cases is the parallax method.

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (126)

Additional Information

  • Kepler's Laws of Planetary Motion
    • ​Planets move in elliptical orbits with the Sun as a focus.
    • A planet covers the same area of space in the same amount of time no matter where it is in its orbit.
    • A planet's orbital period is proportional to the size of its orbit.

Indian Army Agniveer Technical Mock Test - 3 - Question 31

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A block is submerged partially in water and remaining 1/3 part is outside the water level, then the density of the block is-

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 31

CONCEPT:

  • Archimedes' principle: Every object is bouncing upwards by a force equal to the weight of the fluid the object displaces. This force is also known as the bouncing force.

Fb = ρ g Vf

Where Fb is bouncing force, ρ is the density of the fluid, Vf is the volume of the displaced fluid, and g is the acceleration due to gravity.

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (128)

CALCULATION:

Given that 1/3 part is out of water.

So, 2/3 part is submerged in water.

Let D is the density of the block

The density of wood/Density of Water = Part of block submerged/Total Part

D/1 = (2/3)/1

D = 2/3 = 0.67 g/cm3.

D = 0.67 g/cm3. So option 1 is correct.

Indian Army Agniveer Technical Mock Test - 3 - Question 32

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Which of these waves is a Electromagnetic waves?

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 32

The correct answer is option 4 (None of the above) listed (sound waves, ultrasonic waves, alpha wave) are classified as electromagnetic waves

  • The examples of electromagnetic waves are:
    1. Radio waves.
    2. Microwaves.
    3. Infrared waves.
    4. Visible light.
    5. Ultraviolet.
    6. X-rays.
    7. Gamma rays.
  • Radio waves are electromagnetic waves with maximum wavelength.
  • Infrared ray was discovered by William Herschell.
    • The heat of the sunlight is due to infrared waves.
    • Infrared waves are used in TV remotes.
  • Sound waves are longitudinal waves.
    • It can not travel through a vacuum.
    • The study of sound is called acoustics.
    • Sound travels faster in solids.
    • Sound waves higher than 20 kHz are called Ultrasonic sounds.

Indian Army Agniveer Technical Mock Test - 3 - Question 33

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An average human being can hear sound of minimum frequency upto:

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 33

The correct answer is 20 Hz.Key Points

  • Around 20 Hz to 20 kHz is the frequency range in which people can hear sounds.
  • The majority of tiny mammals are not responsive to low frequencies, only to very high frequencies.
  • For instance, while some bat species are sensitive to tones as high as 200 kHz, their lower frequency threshold is closer to 20 kHz, which is the upper frequency threshold for young individuals with normal hearing.
  • Certain whales can detect infrasonic noises as low as 7 Hz.
  • Elephants can hear sounds at a frequency of 14 to 16 Hz.

Indian Army Agniveer Technical Mock Test - 3 - Question 34

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What is the approximate range of wavelength in case of visible lights?

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 34

The correct answer is 4000 Å to 7000 Å

Key Points

  • The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye.
  • A wavelength is the distance between two consecutive peaks of a wave.
  • The wavelength of the visible spectrum is in the range of 4000 Å to 7000 Å (A is angstrom).
  • The visible spectrum is VIBGYOR (Violet, Indigo, Blue, Green, Yellow, Orange, Red).
  • Violet has the shortest wavelength, at around 380 nanometers, and red has the longest wavelength, at around 700 nanometers in this spectrum.

Additional Information

  • The electromagnetic spectrum is the entire distribution of electromagnetic radiation according to frequency or wavelength.
  • EM radiation is created when an atomic particle, such as an electron, is accelerated by an electric field, causing it to move.
  • The movement produces oscillating electric and magnetic fields, which travel at right angles to each other in a bundle of light energy called a photon.
  • Frequency is the number of waves that form in a given length of time.
  • It is usually measured as the number of wave cycles per second, or hertz (Hz).
  • Electromagnetic radiations with shorter wavelengths than visible are called ultraviolet, X-rays, or gamma rays progressively.
  • Electromagnetic radiations with longer wavelengths than visible are called infrared, microwaves, or radio waves progressively.
  • Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (132)

Indian Army Agniveer Technical Mock Test - 3 - Question 35

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Which of the following relation of value of 'g' at equator and poles of earth is correct?

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 35

The correct answer is Poles > equator

Key Points

  • The force of earth's gravity on the body at the equator is 9.798 m/s2 times the mass of the body, whereas at the poles it is 9.863 m/s2 times the mass of the body.
  • Thus, the force of gravity at Poles is greater than the force of gravity at the Equator.
  • The distance from the poles to the centre of the earth is lesser than the distance from the equator to the centre of the earth. Therefore the acceleration due to gravity is greater at the poles than at the equator.

Additional Information

  • The value of g on earth is maximum at the poles and goes on decreasing as we go towards the equator.
  • The value of 'g' is minimum at the equator because the earth is not a perfect sphere. Its radius is maximum at the equator. Hence, according to the equation g = GM/R2, the equator is the place where g will be minimum.
  • Even on the surface of the Earth, there are local variations in the value of g. These variations are due to latitude (the Earth isn't a perfect sphere; it buldges in the middle), altitude and the local geological structure of the region.

Indian Army Agniveer Technical Mock Test - 3 - Question 36

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What is the purpose of grooves on the soles of shoes?

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 36

The correct answer is a Better grip on the floor.

Key Points

  • The soles of the shoes have grooves in order to increase friction between the surface of the floor and the soles of the shoes.
  • This prevents slipping on the floor.
  • A flat sole or a polished floor will generally reduce the friction between shoe and floor as the flat surfaces slide past each other more easily and thus grooves are necessary to prevent slipping.

Additional Information

  • Friction is the force that opposes the motion of a solid object over another.
  • There are mainly four types of friction: static friction, sliding friction, rolling friction, and fluid friction.
  • The frictional force between two bodies depends mainly on three factors:
    • The adhesion between body surfaces
    • The roughness of the surface
    • Deformation of bodies.
  • Using lubricants such as oil or grease can reduce the friction between the surfaces.

Indian Army Agniveer Technical Mock Test - 3 - Question 37

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It is more convenient to wash clothes in hot water because ______

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 37

The Correct answer is Hot water has lower surface tension.

Key Points

  • Surface tension: Surface tension is a force per unit length acting in the plane of interface between the liquid and the bounding surface.
    • Its unit is ‘N/m’ and the dimensions are [MT-2].
    • Surface tension is a property that arises due to the intermolecular forces of attraction among the molecules of the liquid.
    • Greater are the intermolecular forces of attraction; higher is the surface tension of that liquid.

EXPLANATION :

  • The surface tension decreases as the temperature increases.
  • The surface tension of hot water is very less compared to cold water and thus that makes washing clothes easier in hot water

Indian Army Agniveer Technical Mock Test - 3 - Question 38

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1 Newton (N) is equal to ______.

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 38

Concept:

Force

  • 1 Newton is equal to the pressure with which the force of 1 N is exercised perpendicular to the area of 1 m2
  • 1 N = 1 kg m/s2
  • Newton is the unit of Force.

Pressure

  • 1 Newton per square metre (1 pascal) is equal to the pressure with which force of 1 N is exercised perpendicular to the area of 1 m2
  • 1 Pa = 1 N/m2 .
  • 1 Bar (bar) is the special name for 100000 Pa.

Normal stress (tensile or compressive), Shear stress

  • 1 Newton per square metre (1 pascal) to the mechanical stress with which the force of 1 N is exercised on the area of 1 m2
  • In many branches of engineering, the mechanical stress and strength are specified in N/m2.
  • 1 N/m2 = 1 Pa
  • 1000000 Pa = 1 MPa

Power

  • 1 Watt is equal to the power with which the energy of 1 J is converted during the time of 1 s.
  • The unit watt is also called volt-ampere in the specification of apparent electric power
  • 1 W = 1 J/s = 1 Nm s = 1 VA

Indian Army Agniveer Technical Mock Test - 3 - Question 39

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Convert 1000 N in to dynes.

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 39

Correct answer is 108 dyne

Key Points

Newton:

  • It is the S.I unit of Force.
  • It is equal to the force that would give a mass of one kilogram an acceleration of one meter per second per second and is equivalent to 100,000 dynes.
  • 1000 Newton. = 108 dyne

Additional Information

  • CGS unit: It is the system of measurement where physical quantity is expressed in centimeter, gram and second.
  • The CGS unit of Force is dyne.

1 dyne = 1 gm cm s -2

Indian Army Agniveer Technical Mock Test - 3 - Question 40

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Which of the following statements is INCORRECT regarding the magnetic lines of force?

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 40

Correct answer is They start from the north pole and end at the south pole.

Key Points

CONCEPT:

  • Magnetic field: The magnetic field is a field produced by the magnet.
  • Magnetic field lines: Magnetic fields are represented using magnetic field lines.
    • It is used to visualize the strength and the direction of the magnetic field.
  • Properties of Magnetic Field Lines
    • At a point, the tangent drawn on the magnetic field line gives the direction of the magnetic field at that point.
    • The density of the field lines gives the strength of the field.
    • Inside a magnet, the magnetic field lines go from the south pole to the north pole.
    • Outside magnet, Magnetic field lines appear to emerge or start from the north pole and merge or terminate at the south pole.
    • Magnetic field lines form a closed-loop.
    • Magnetic field lines never intersect with each other.
    • Field lines represent both magnitude and direction at any point on the field.

EXPLANATION:

  • Magnetic field lines outside and inside the magnet are given below in the figure.

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (139)

Indian Army Agniveer Technical Mock Test - 3 - Question 41

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Calcium oxide and water combine to form calcium hydroxide. This is an example of ______ reaction.

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 41

The correct answer is Both combination reaction and exothermic reaction.Key Point

  • The reaction between calcium oxide (CaO) and water (H2O) to form calcium hydroxide (Ca(OH)2) is an example of a combination reaction.
  • A combination reaction is a chemical reaction in which two or more substances combine to form a single new substance.
  • In this case, calcium oxide and water combine to form calcium hydroxide.
  • Here is the chemical equation for the reaction:

CaO + H2O → Ca(OH)2 + Heat

  • Combination reactions are typically exothermic, meaning that they release heat.
  • This is because the bonds in the products are stronger than the bonds in the reactants.
  • In the case of the reaction between calcium oxide and water, the reaction is highly exothermic and releases a lot of heat.
  • Hence, the correct answer is combination and exothermic reaction.

Indian Army Agniveer Technical Mock Test - 3 - Question 42

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What causes Nitrogen to be Inert?

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 42

Concept:

  • The element Nitrogen is the first member of group 15 or V A.
  • Nitrogen is a typical non - metal. It is essential for both plants and animals.
  • The electronic configuration of Nitrogen is 1s22s22p3.
  • Nitrogen consists of mostly 78.1 % of the earth's atmosphere.
  • However, it is not equally abundant in the earth's crust. It is the third most abundant element in the earth's crust.
  • Nitrogen is an important constituent of amino acids in proteins.
  • Nitrates are highly soluble in water.

Explanation:

  • Nitrogen is an inert element, it is a diatomic gas that shows reactivity only at high temperatures.
  • The nitrogen molecule is covalent and non-polar.
  • Nitrogen forms a triple bond with other nitrogen atoms forming N2 molecules.
  • As triple bonds are strong, it is not broken by the collision between the nitrogen molecules at room temperature.
  • Furthermore, its octet is complete and it does not require additional electrons.
  • Only at high temperatures, sufficient energy is provided by the collision to break the triple bond.
  • Thus at high temperatures, nitrogen molecule gets dissociated and shows some reactivity.

Hence, the reason for Nitrogen to be inert is its high bond energy.

Mistake Points

  • Note that multiple bond formation always doesn't necessarily mean that the molecule will be inert.

Indian Army Agniveer Technical Mock Test - 3 - Question 43

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A class of organic compounds that contain an oxygen between two alkyl groups is called:

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 43

The correct answer is ether.Key Points

  • Ether:-
    • It is a class of organic compounds that contains an oxygen atom between two alkyl groups.
    • The general formula for an ether is R-O-R', where .R and R' are alkyl groups
    • Ethers are commonly used as solvents in various industries, including pharmaceuticals, paints, and coatings.
    • Ethers are less reactive than alcohols, aldehydes, and ketones because the C-O bond is relatively stable.

Additional Information

  • Alcohol:-
    • A class of organic compounds that contains a hydroxyl (-OH) group attached to a carbon atom.
    • They are commonly used as solvents, disinfectants, and fuels.
  • Aldehyde:-
    • A class of organic compounds that contains a carbonyl group (-COH) attached to a carbon atom at the end of the molecule.
    • They are commonly used in the production of plastics, resins, and dyes.
  • Ketone:-
    • A class of organic compounds that contains a carbonyl group (-C=O) attached to a carbon atom in the middle of the molecule.
    • They are commonly used in the production of solvents, polymers, and pharmaceuticals.

Indian Army Agniveer Technical Mock Test - 3 - Question 44

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Which one among the following are the correct symbols for the elements gold, tin and lead, respectively?

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 44

The correct answer is Au, Sn, Pb.

Key Points

  • Gold (Au):
    • Gold is a transition metal with the chemical symbol Au, which is derived from the Latin word "aurum".
    • Its atomic number in the periodic table is 79 and it is known for its distinctive yellow color, ductility and high conductivity.
  • Tin (Sn):
    • Tin is a transition metal with the chemical symbol Sn, which is derived from the Latin word "stannum".
    • Its atomic number is 50 and it is commonly used in the production of alloys such as bronze and solder.
  • Lead (Pb):
    • Lead is also a transition metal with the chemical symbol Pb, which is derived from the Latin word "plumbum".
    • Its atomic number is 82 and it is known for its dense and flexible properties.

Additional Information

  • Gallium
    • It has the symbol Ga.
    • Atomic number 31.
  • Astatine
    • It has the symbol At
    • Atomic number 85.
  • Antimony
    • It has the symbol Sb
    • Atomic number 51.

Indian Army Agniveer Technical Mock Test - 3 - Question 45

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Which one among the following contains the most neutrons?

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 45

The correct answer is Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (149)

Key Points

The number of neutrons in an atom can be calculated by subtracting the atomic number (number of protons) from the mass number (total number of protons and neutrons). Let's calculate the number of neutrons for each of the given isotopes:

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (150)
Atomic number (protons) = 26
Mass number (protons + neutrons) = 59
Number of neutrons = Mass number - Atomic number = 59 - 26 = 33 neutrons

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (151)
Atomic number (protons) = 29
Mass number (protons + neutrons) = 61
Number of neutrons = Mass number - Atomic number = 61 - 29 = 32 neutrons

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (152)
Atomic number (protons) = 30
Mass number (protons + neutrons) = 61
Number of neutrons = Mass number - Atomic number = 61 - 30 = 31 neutrons

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (153)
The given ion is Zn2+, which means it has lost 2 electrons compared to a neutral zinc atom. However, the number of protons and neutrons remains the same as in a neutral atom.
Atomic number (protons) = 30
Mass number (protons + neutrons) = 60
Number of neutrons = Mass number - Atomic number = 60 - 30 = 30 neutrons

Among the options given, the isotope with the most neutrons is Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (154) with 33 neutrons.

Indian Army Agniveer Technical Mock Test - 3 - Question 46

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Which of the following is NOT a physical change?

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 46

The Correct Answer is Option 2.: Fermentation of Substances

  • Liquefaction of gases is the process of converting gas into a liquid state.
    • Example: Storage of LPG under high pressure.
  • Fermentation: It is the chemical change in which a substance breaks down into a simpler substance.
    • Alcohol creation is an example of fermentation
  • Vaporization:
    • The process in which a liquid substance changes into a gas state by rapid heating is called vaporization.
  • Melting: It is a physical process in which the substance of solid changes into a liquid.
    • Ice melting into water is an example of this conversion.

Indian Army Agniveer Technical Mock Test - 3 - Question 47

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Which of the following is the isotone of 32Ge76

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 47

The correct answer is 33As77

Concept-:

  • The total number of electrons (or protons) in a neutral atom is called its atomic number, denoted by Z.
  • The total number of protons and neutrons in the nucleus of an atom is known as its Mass Number and is denoted by A.

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (157)
Explanation:

The number of neutrons is calculated by the difference in M-A.

  • The number of neutrons in 32Ge76 is
    76-32 = 44​
  • The number of neutrons in 32Ge77 is
    77 - 32 = 45
  • The number of neutrons in 33As77 is
    77 - 33 = 44
  • The number of neutrons in 36Sc78 is:
    78-36 = 42
  • The number of neutrons in 34Sc77 is:
    77 - 34 = 43
  • We see that the number of neutrons is the same in 32Ge76 and 33As77 and thus they are isotones.

Hence, the isotone of 32Ge76 is 33As77.

Indian Army Agniveer Technical Mock Test - 3 - Question 48

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Which one of the following correctly represents metals in decreasing order of reactivity?

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 48

The Correct answer is Al > Zn > Fe > Cu.

Explanation:

  • The Reactivity series of metals refers to the arrangement of metals in the descending order of their reactivities.
  • ​Features of the Reactivity series:
    • The metals at the top of the reactivity series are powerful reducing agents since they are easily oxidized and get corroded very easily.
    • The reducing ability of the metals grows weaker while traversing down the series.
    • The electro-positivity of the elements also reduces while moving down the reactivity series of metals.
    • All metals that are found above hydrogen in the activity series liberate H2 gas upon reacting with dilute HCl or dilute H2SO4.
    • Metals that are placed higher on the reactivity series have the ability to displace metals that are placed lower from their salt solutions.

Indian Army Agniveer Technical Mock Test - 3 Free MCQ Practice Test with Solutions - Indian Army Agniveer (159)

So, the correct representation of metals in decreasing order of reactivity is Al > Zn > Fe > Cu.

Indian Army Agniveer Technical Mock Test - 3 - Question 49

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Which gas is used to extinguish a fire?

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 49

The correct answer is Carbon dioxide.

Key Points

  • Carbon dioxide
    • Carbon dioxide extinguishers work by displacing oxygen or taking away the oxygen element of the fire triangle.
    • The carbon dioxide is also very cold as it comes out of the extinguisher, so it cools the fuel as well.
    • It is because carbon dioxide does not support combustion.
    • When sprayed on the burning object it stops the supply of oxygen and extinguishes fire.
    • Carbon dioxide is the most commonly used gas for extinguishing fires. Hence, Option 3 is correct.
    • Sodium bicarbonate is used to release a cloud of Co2, especially in class A and class B fires, thus releasing the oxygen and smothering the fire
    • Carbon dioxide is an acidic colorless gas with a density about 53% higher than that of dry air. Carbon dioxide molecules consist of a carbon atom covalently double bonded to two oxygen atoms. It occurs naturally in Earth's atmosphere as a trace gas.
    • Molar mass: 44.01 g/mol
    • Formula: CO2
    • Boiling point: -78.46 °C
    • Soluble in: Wate

Additional Information

  • Nitrogen
    • It is the chemical element with the symbol N and atomic number 7. It was first discovered and isolated by Scottish physician Daniel Rutherford in 1772.
    • Symbol: N
    • Atomic mass: 14.0067 u
    • Atomic number: 7
    • Electron configuration: [He] 2s22p3
    • Electronegativity: 3.04
    • Boiling point: -195.8 °C
  • Oxygen
    • It is the chemical element with the symbol O and atomic number 8.
    • It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds.
    • Symbol: O
    • Atomic mass: 15.999 u
    • Atomic number: 8
    • Electron configuration: [He] 2s²2p⁴
    • Electronegativity: 3.44
    • Discoverers: Joseph Priestley, Antoine Lavoisier, Carl Wilhelm Scheele
  • Argon
    • It is a chemical element with the symbol Ar and atomic number 18.
    • It is in group 18 of the periodic table and is a noble gas. Argon is the third-most abundant gas in the Earth's atmosphere, at 0.934%.
    • Symbol: Ar
    • Atomic mass: 39.948 u
    • Atomic number: 18
    • Electron configuration: [Ne] 3s²3p⁶
    • Boiling point: -185.8 °C
    • Discoverers: William Ramsay, John William Strutt, 3rd Baron Rayleigh

Indian Army Agniveer Technical Mock Test - 3 - Question 50

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Stainless steel is very useful material for our life. In stainless steel, iron is mixed with

Detailed Solution for Indian Army Agniveer Technical Mock Test - 3 - Question 50

Concept:

  • Alloys are the uniform mixtures of two or more metals along with the traces of non-metals.
  • They come under the class of hom*ogeneous mixtures.
  • Various alloys are used in different ways in daily life.

Explanation:

  • Stainless steel is an iron alloy. It is used in making vessels for cooking in homes.
  • Used to make cutlery.
  • Also used to make heavy containers that are useful in industries.
  • In making tooth protective crowns.
  • In making surgical apparatus.
  • This stainless steel has more advantages compared to iron.
  • It is rust-free. Light in weight compared to iron. It has high durability and is long-lasting.

Stainless steel is a hom*ogenous mixture of metals: Fe+, Ni+ Cr+ with very less amount of carbon.

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