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Question (31)

QN006262

A scooter moving at 8 m/s has kinetic energy 3200 J. Its mass is:

(A) 25 kg
(B) 50 kg
(C) 75 kg
(D) 100 kg

Correct Answer: D

Explanation:

3200 = ½ × m × 64, so m = 100 kg

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Question (32)

QN006263

The SI unit of kinetic energy is:

(A) Watt
(B) Joule
(C) Newton
(D) Pascal

Correct Answer: B

Explanation:

SI unit of energy is joule

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Question (33)

QN006264

A body initially at rest gains kinetic energy of 72 J. Net work done on it is:

(A) 0 J
(B) 36 J
(C) 72 J
(D) –72 J

Correct Answer: C

Explanation:

Work done equals gain in kinetic energy

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Question (34)

QN006265

A stone moving at high speed can break glass because it possesses:

(A) Potential energy
(B) Heat energy
(C) Kinetic energy
(D) Magnetic energy

Correct Answer: C

Explanation:

Moving objects possess kinetic energy

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Question (35)

QN006266

A 6 kg object moving at 3 m/s is stopped. Work done by braking force is:

(A) –27 J
(B) 27 J
(C) –54 J
(D) 54 J

Correct Answer: A

Explanation:

Initial KE = ½ × 6 × 9 = 27 J, final KE = 0

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Question (36)

QN006267

A moving object has kinetic energy 98 J and mass 2 kg. Its speed is:

(A) 5 m/s
(B) 7 m/s
(C) 9.9 m/s
(D) 14 m/s

Correct Answer: C

Explanation:

v = √(2 × 98 / 2) = √98 ≈ 9.9 m/s

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Question (37)

QN006268

Which graph concept is related to work-energy theorem?

(A) Area under velocity-time graph
(B) Area under force-displacement graph
(C) Slope of displacement-time graph
(D) Slope of velocity-time graph

Correct Answer: B

Explanation:

Area under force-displacement graph gives work done

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Question (38)

QN006269

A player kicks a football at rest. The ball moves because:

(A) Its mass decreases
(B) Work done increases kinetic energy
(C) Gravity disappears
(D) Air pressure changes

Correct Answer: B

Explanation:

Work done transfers kinetic energy to the ball

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Question (39)

QN006270

A body moving with speed 12 m/s has kinetic energy 144 J. Its mass is:

(A) 1 kg
(B) 2 kg
(C) 3 kg
(D) 4 kg

Correct Answer: B

Explanation:

144 = ½ × m × 144, so m = 2 kg

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Question (40)

QN006271

If the speed of an object becomes half, its kinetic energy becomes:

(A) Half
(B) Double
(C) One-fourth
(D) Four times

Correct Answer: C

Explanation:

KE ∝ v²

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Question (31)

A scooter moving at 8 m/s has kinetic energy 3200 J. Its mass is:

Explanation:

Link:

Question (32)

The SI unit of kinetic energy is:

Explanation:

Link:

Question (33)

A body initially at rest gains kinetic energy of 72 J. Net work done on it is:

Explanation:

Link:

Question (34)

A stone moving at high speed can break glass because it possesses:

Explanation:

Link:

Question (35)

A 6 kg object moving at 3 m/s is stopped. Work done by braking force is:

Explanation:

Link:

Question (36)

A moving object has kinetic energy 98 J and mass 2 kg. Its speed is:

Explanation:

Link:

Question (37)

Which graph concept is related to work-energy theorem?

Explanation:

Link:

Question (38)

A player kicks a football at rest. The ball moves because:

Explanation:

Link:

Question (39)

A body moving with speed 12 m/s has kinetic energy 144 J. Its mass is:

Explanation:

Link:

Question (40)

If the speed of an object becomes half, its kinetic energy becomes:

Explanation:

Link:

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