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Question (21)

QN006252

A force acting on an object increases its speed from 2 m/s to 6 m/s. The kinetic energy:

(A) Decreases
(B) Remains same
(C) Increases
(D) Becomes zero

Correct Answer: C

Explanation:

Increase in speed increases kinetic energy

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Question (22)

QN006253

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:

v = √(2KE/m) = √(500/5) = 10 m/s

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Question (23)

QN006254

If no work is done on a moving object, its kinetic energy:

(A) Must increase
(B) Must decrease
(C) Remains constant
(D) Becomes negative

Correct Answer: C

Explanation:

Zero work means no change in kinetic energy

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Question (24)

QN006255

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 (25)

QN006256

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:

Loss in kinetic energy means negative work

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Question (26)

QN006257

Which situation best demonstrates the work-energy theorem?

(A) A wall standing still
(B) A moving car speeding up after engine force acts
(C) A book lying on a table
(D) A lamp glowing

Correct Answer: B

Explanation:

Work done changes kinetic energy

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Question (27)

QN006258

A 3 kg body moving at 2 m/s gains 24 J energy. Its final kinetic energy is:

(A) 6 J
(B) 24 J
(C) 30 J
(D) 36 J

Correct Answer: C

Explanation:

Initial KE = 6 J, final KE = 6 + 24 = 30 J

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Question (28)

QN006259

Initial kinetic energy of a body is 100 J. If 40 J work is done against motion, final kinetic energy becomes:

(A) 140 J
(B) 100 J
(C) 60 J
(D) 40 J

Correct Answer: C

Explanation:

Final KE = 100 – 40 = 60 J

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Question (29)

QN006260

A 10 kg object moving at 2 m/s has kinetic energy:

(A) 10 J
(B) 20 J
(C) 40 J
(D) 80 J

Correct Answer: B

Explanation:

KE = ½ × 10 × 2² = 20 J

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Question (30)

QN006261

Which factor affects kinetic energy most strongly?

(A) Temperature
(B) Velocity squared
(C) Shape
(D) Colour

Correct Answer: B

Explanation:

Kinetic energy depends on square of velocity

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Question (21)

A force acting on an object increases its speed from 2 m/s to 6 m/s. The kinetic energy:

Explanation:

Link:

Question (22)

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

Explanation:

Link:

Question (23)

If no work is done on a moving object, its kinetic energy:

Explanation:

Link:

Question (24)

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

Explanation:

Link:

Question (25)

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

Explanation:

Link:

Question (26)

Which situation best demonstrates the work-energy theorem?

Explanation:

Link:

Question (27)

A 3 kg body moving at 2 m/s gains 24 J energy. Its final kinetic energy is:

Explanation:

Link:

Question (28)

Initial kinetic energy of a body is 100 J. If 40 J work is done against motion, final kinetic energy becomes:

Explanation:

Link:

Question (29)

A 10 kg object moving at 2 m/s has kinetic energy:

Explanation:

Link:

Question (30)

Which factor affects kinetic energy most strongly?

Explanation:

Link:

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