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Free MCQs with Answers | Military Brat Defence Academy

Q: A reaction that releases heat is called:

Correct Answer: B. exothermic. An exothermic reaction releases heat.

Q: The gas essential for ordinary combustion is:

Correct Answer: B. oxygen. Oxygen supports ordinary combustion.

Q: The most abundant gas in air is:

Correct Answer: B. nitrogen. Nitrogen is the most abundant gas in air.

Q: Pure water at room temperature has pH close to:

Correct Answer: C. 7. Pure water is approximately neutral.

Q: Hardness of water is commonly due to salts of:

Correct Answer: B. calcium and magnesium. Calcium and magnesium salts cause hardness.

Q: Highly reactive metals are commonly extracted using:

Correct Answer: A. electrolysis. Electrolysis is used for highly reactive metals.

Q: An atom has atomic number 6. Its number of protons is:

Correct Answer: A. 6. Atomic number equals the number of protons.

Q: A solution has pH 2. It is:

Correct Answer: A. acidic. A pH below 7 indicates an acidic solution.

Q: The region around a magnet where magnetic effect is experienced is called:

Correct Answer: B. magnetic field. It is the magnetic field.

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QID #1144747 Agniveer Army Technical 2027 Mock Test Series Agniveer Army Technical Online Mock Test 16 Medium

A reaction that releases heat is called:

Correct Answer: B. exothermic
An exothermic reaction releases heat.

Question: A reaction that releases heat is called:

A. endothermic

B. exothermic

C. reversible only

D. neutral

Correct Answer: B. exothermicExplanation: An exothermic reaction releases heat.

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QID #1144746 Agniveer Army Technical 2027 Mock Test Series Agniveer Army Technical Online Mock Test 16 Medium

The gas essential for ordinary combustion is:

Correct Answer: B. oxygen
Oxygen supports ordinary combustion.

Question: The gas essential for ordinary combustion is:

A. nitrogen

B. oxygen

C. argon

D. neon

Correct Answer: B. oxygenExplanation: Oxygen supports ordinary combustion.

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QID #1144745 Agniveer Army Technical 2027 Mock Test Series Agniveer Army Technical Online Mock Test 16 Medium

The most abundant gas in air is:

Correct Answer: B. nitrogen
Nitrogen is the most abundant gas in air.

Question: The most abundant gas in air is:

A. oxygen

B. nitrogen

C. carbon dioxide

D. argon

Correct Answer: B. nitrogenExplanation: Nitrogen is the most abundant gas in air.

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QID #1144744 Agniveer Army Technical 2027 Mock Test Series Agniveer Army Technical Online Mock Test 16 Medium

Pure water at room temperature has pH close to:

Correct Answer: C. 7
Pure water is approximately neutral.

Question: Pure water at room temperature has pH close to:

A. 2

B. 5

C. 7

D. 12

Correct Answer: C. 7Explanation: Pure water is approximately neutral.

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QID #1144743 Agniveer Army Technical 2027 Mock Test Series Agniveer Army Technical Online Mock Test 16 Medium

Hardness of water is commonly due to salts of:

Correct Answer: B. calcium and magnesium
Calcium and magnesium salts cause hardness.

Question: Hardness of water is commonly due to salts of:

A. sodium and potassium

B. calcium and magnesium

C. silver and gold

D. carbon only

Correct Answer: B. calcium and magnesiumExplanation: Calcium and magnesium salts cause hardness.

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QID #1144742 Agniveer Army Technical 2027 Mock Test Series Agniveer Army Technical Online Mock Test 16 Medium

Highly reactive metals are commonly extracted using:

Correct Answer: A. electrolysis
Electrolysis is used for highly reactive metals.

Question: Highly reactive metals are commonly extracted using:

A. electrolysis

B. simple filtration

C. sedimentation

D. evaporation only

Correct Answer: A. electrolysisExplanation: Electrolysis is used for highly reactive metals.

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QID #1144741 Agniveer Army Technical 2027 Mock Test Series Agniveer Army Technical Online Mock Test 16 Medium

An atom has atomic number 6. Its number of protons is:

Correct Answer: A. 6
Atomic number equals the number of protons.

Question: An atom has atomic number 6. Its number of protons is:

A. 6

B. 7

C. 5

D. 12

Correct Answer: A. 6Explanation: Atomic number equals the number of protons.

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QID #1144740 Agniveer Army Technical 2027 Mock Test Series Agniveer Army Technical Online Mock Test 16 Medium

A solution has pH 2. It is:

Correct Answer: A. acidic
A pH below 7 indicates an acidic solution.

Question: A solution has pH 2. It is:

A. acidic

B. basic

C. neutral

D. metallic

Correct Answer: A. acidicExplanation: A pH below 7 indicates an acidic solution.

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QID #1144739 Agniveer Army Technical 2027 Mock Test Series Agniveer Army Technical Online Mock Test 16 Medium

An element X has valency 1. If oxygen has valency 2, which statement is useful while writing the simplest oxide formula?

Correct Answer: A. Criss-cross the valencies and simplify the ratio
The criss-cross method uses valencies to obtain the simplest combining ratio.

Question: An element X has valency 1. If oxygen has valency 2, which statement is useful while writing the simplest oxide formula?

A. Criss-cross the valencies and simplify the ratio

B. Add the valencies only

C. Ignore oxygen's valency

D. Use atomic masses instead

Correct Answer: A. Criss-cross the valencies and simplify the ratioExplanation: The criss-cross method uses valencies to obtain the simplest combining ratio.

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QID #1144738 Agniveer Army Technical 2027 Mock Test Series Agniveer Army Technical Online Mock Test 16 Medium

The region around a magnet where magnetic effect is experienced is called:

Correct Answer: B. magnetic field
It is the magnetic field.

Question: The region around a magnet where magnetic effect is experienced is called:

A. electric field

B. magnetic field

C. gravitational field

D. thermal field

Correct Answer: B. magnetic fieldExplanation: It is the magnetic field.

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QID #1144737 Agniveer Army Technical 2027 Mock Test Series Agniveer Army Technical Online Mock Test 16 Medium

Electrical resistance is measured in:

Correct Answer: B. Ohm
Resistance is measured in ohms.

Question: Electrical resistance is measured in:

A. Ampere

B. Ohm

C. Volt

D. Watt

Correct Answer: B. OhmExplanation: Resistance is measured in ohms.

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QID #1144736 Agniveer Army Technical 2027 Mock Test Series Agniveer Army Technical Online Mock Test 16 Medium

A sample has mass 360 g and volume 60 cm³. Density is:

Correct Answer: A. 6 g/cm³
Density = mass/volume.

Question: A sample has mass 360 g and volume 60 cm³. Density is:

A. 6 g/cm³

B. 21600 g/cm³

C. 0.166667 g/cm³

D. 420 g/cm³

Correct Answer: A. 6 g/cm³Explanation: Density = mass/volume.

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QID #1144735 Agniveer Army Technical 2027 Mock Test Series Agniveer Army Technical Online Mock Test 16 Medium

A wave has frequency 50 Hz and wavelength 3 m. Its speed is:

Correct Answer: A. 150 m/s
Wave speed v=fλ.

Question: A wave has frequency 50 Hz and wavelength 3 m. Its speed is:

A. 150 m/s

B. 16.6667 m/s

C. 53 m/s

D. 0.06 m/s

Correct Answer: A. 150 m/sExplanation: Wave speed v=fλ.

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QID #1144734 Agniveer Army Technical 2027 Mock Test Series Agniveer Army Technical Online Mock Test 16 Medium

A current of 2 A flows through a resistance of 4 Ω. The voltage is:

Correct Answer: A. 8 V
Ohm's law: V = IR.

Question: A current of 2 A flows through a resistance of 4 Ω. The voltage is:

A. 8 V

B. 6 V

C. 2 V

D. 0.5 V

Correct Answer: A. 8 VExplanation: Ohm's law: V = IR.

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QID #1144733 Agniveer Army Technical 2027 Mock Test Series Agniveer Army Technical Online Mock Test 16 Medium

A force of 42 N moves an object 2 m in the force direction. Work done is:

Correct Answer: A. 84 J
Work = force × displacement.

Question: A force of 42 N moves an object 2 m in the force direction. Work done is:

A. 84 J

B. 44 J

C. 21 J

D. 168 J

Correct Answer: A. 84 JExplanation: Work = force × displacement.

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QID #1144732 Agniveer Army Technical 2027 Mock Test Series Agniveer Army Technical Online Mock Test 16 Medium

An object has initial velocity 4 m/s and acceleration 3 m/s² for 2 s. Final velocity is:

Correct Answer: A. 10 m/s
Use v = u + at.

Question: An object has initial velocity 4 m/s and acceleration 3 m/s² for 2 s. Final velocity is:

A. 10 m/s

B. 8 m/s

C. 6 m/s

D. 13 m/s

Correct Answer: A. 10 m/sExplanation: Use v = u + at.

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QID #1144731 Agniveer Army Technical 2027 Mock Test Series Agniveer Army Technical Online Mock Test 16 Medium

The binary representation of decimal 10 is:

Correct Answer: B. 1010
10 in binary is 1010.

Question: The binary representation of decimal 10 is:

A. 1001

B. 1010

C. 1100

D. 1110

Correct Answer: B. 1010Explanation: 10 in binary is 1010.

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QID #1144730 Agniveer Army Technical 2027 Mock Test Series Agniveer Army Technical Online Mock Test 16 Medium

A bag has 2 red and 4 blue balls. Probability of drawing a red ball is:

Correct Answer: A. 2/6
Probability = favorable outcomes / total outcomes.

Question: A bag has 2 red and 4 blue balls. Probability of drawing a red ball is:

A. 2/6

B. 4/6

C. 1/6

D. 1/6

Correct Answer: A. 2/6Explanation: Probability = favorable outcomes / total outcomes.

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QID #1144729 Agniveer Army Technical 2027 Mock Test Series Agniveer Army Technical Online Mock Test 16 Medium

The median of 28, 31, 34, 37, 40 is:

Correct Answer: B. 34
For five ordered values, the median is the third value.

Question: The median of 28, 31, 34, 37, 40 is:

A. 31

B. 34

C. 37

D. 40

Correct Answer: B. 34Explanation: For five ordered values, the median is the third value.

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QID #1144728 Agniveer Army Technical 2027 Mock Test Series Agniveer Army Technical Online Mock Test 16 Medium

If the angle of elevation of the top of a pole is 45° and the observer is 20 m away, the pole's height (ignoring eye height) is:

Correct Answer: B. 20 m
tan45°=1, so height equals horizontal distance.

Question: If the angle of elevation of the top of a pole is 45° and the observer is 20 m away, the pole's height (ignoring eye height) is:

A. 10 m

B. 20 m

C. 20√2 m

D. 40 m

Correct Answer: B. 20 mExplanation: tan45°=1, so height equals horizontal distance.

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