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Question (21)

QN0026336

The Work-Energy Theorem states that:

(A) Work done is always zero
(B) Energy can neither be created nor destroyed
(C) Work done on an object equals change in its kinetic energy
(D) Power equals work done per second

Correct Answer: C

Explanation:

Work done by net force equals change in kinetic energy.

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Question (22)

QN0026337

The formula for kinetic energy is:

(A) mv
(B) ½mv²
(C) mgh
(D) Fd

Correct Answer: B

Explanation:

Kinetic energy = ½mv².

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Question (23)

QN0026338

A 4 kg object moving at 5 m/s has kinetic energy:

(A) 20 J
(B) 25 J
(C) 50 J
(D) 100 J

Correct Answer: C

Explanation:

KE = ½ × 4 × 5² = 50 J.

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Question (24)

QN0026339

If velocity of a body doubles, its kinetic energy becomes:

(A) Double
(B) Half
(C) Four times
(D) Eight times

Correct Answer: C

Explanation:

Kinetic energy depends on square of velocity.

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Question (25)

QN0026340

A force does –150 J of work on an object. The kinetic energy of the object:

(A) Increases by 150 J
(B) Decreases by 150 J
(C) Becomes zero
(D) Remains constant

Correct Answer: B

Explanation:

Negative work reduces kinetic energy.

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Question (26)

QN0026341

A body of mass 5 kg has kinetic energy 250 J. Its speed is:

(A) 5 m/s
(B) 10 m/s
(C) 15 m/s
(D) 20 m/s

Correct Answer: B

Explanation:

250 = ½ × 5 × v², so v = 10 m/s.

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Question (27)

QN0026342

A moving cricket ball is stopped by a fielder. The kinetic energy of the ball is converted mainly into:

(A) Light energy
(B) Sound energy only
(C) Heat and deformation
(D) Chemical energy

Correct Answer: C

Explanation:

Energy changes into heat and slight deformation.

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Question (28)

QN0026343

A bullet of mass 0.02 kg moving at 100 m/s has kinetic energy:

(A) 10 J
(B) 20 J
(C) 50 J
(D) 100 J

Correct Answer: D

Explanation:

KE = ½ × 0.02 × 100² = 100 J.

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Question (29)

QN0026344

A body loses 400 J kinetic energy due to friction. Work done by friction is:

(A) 400 J
(B) –400 J
(C) Zero
(D) 200 J

Correct Answer: B

Explanation:

Friction does negative work.

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Question (30)

QN0026345

A moving truck has greater kinetic energy than a bicycle moving at same speed because the truck has:

(A) Greater height
(B) Greater mass
(C) Greater colour intensity
(D) Greater temperature

Correct Answer: B

Explanation:

Kinetic energy depends on mass and velocity.

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Question (21)

The Work-Energy Theorem states that:

Explanation:

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Question (22)

The formula for kinetic energy is:

Explanation:

Link:

Question (23)

A 4 kg object moving at 5 m/s has kinetic energy:

Explanation:

Link:

Question (24)

If velocity of a body doubles, its kinetic energy becomes:

Explanation:

Link:

Question (25)

A force does –150 J of work on an object. The kinetic energy of the object:

Explanation:

Link:

Question (26)

A body of mass 5 kg has kinetic energy 250 J. Its speed is:

Explanation:

Link:

Question (27)

A moving cricket ball is stopped by a fielder. The kinetic energy of the ball is converted mainly into:

Explanation:

Link:

Question (28)

A bullet of mass 0.02 kg moving at 100 m/s has kinetic energy:

Explanation:

Link:

Question (29)

A body loses 400 J kinetic energy due to friction. Work done by friction is:

Explanation:

Link:

Question (30)

A moving truck has greater kinetic energy than a bicycle moving at same speed because the truck has:

Explanation:

Link:

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