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Question (41)

QN006272

A net force acting opposite to motion causes kinetic energy to:

(A) Increase
(B) Remain same
(C) Decrease
(D) Become infinite

Correct Answer: C

Explanation:

Opposing force does negative work

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Question (42)

QN006273

A train moving with large speed requires long braking distance because it has:

(A) Small momentum
(B) High kinetic energy
(C) Less mass
(D) Zero work done

Correct Answer: B

Explanation:

Greater kinetic energy requires more work to stop

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Question (43)

QN006274

A 2 kg object has kinetic energy 36 J. Its velocity is:

(A) 3 m/s
(B) 4 m/s
(C) 6 m/s
(D) 9 m/s

Correct Answer: C

Explanation:

36 = ½ × 2 × v², so v = 6 m/s

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Question (44)

QN006275

Work-energy theorem connects work done with:

(A) Potential energy only
(B) Momentum only
(C) Change in kinetic energy
(D) Mass only

Correct Answer: C

Explanation:

Work done equals change in kinetic energy

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Question (45)

QN006276

A body of mass 8 kg moving at 5 m/s has kinetic energy:

(A) 40 J
(B) 80 J
(C) 100 J
(D) 200 J

Correct Answer: C

Explanation:

KE = ½ × 8 × 25 = 100 J

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Question (46)

QN006277

Which activity from daily life shows conversion of work into kinetic energy?

(A) Reading a book
(B) Pushing a swing to make it move faster
(C) Sleeping
(D) Watching television

Correct Answer: B

Explanation:

Work done increases motion of swing

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Question (47)

QN006278

A force does 90 J work on a body whose initial kinetic energy is 10 J. Final kinetic energy becomes:

(A) 80 J
(B) 90 J
(C) 100 J
(D) 110 J

Correct Answer: C

Explanation:

Final KE = 10 + 90 = 100 J

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Question (48)

QN006279

A 1.5 kg body moving with velocity 4 m/s has kinetic energy:

(A) 6 J
(B) 12 J
(C) 18 J
(D) 24 J

Correct Answer: B

Explanation:

KE = ½ × 1.5 × 16 = 12 J

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Question (49)

QN006280

Which statement is true about kinetic energy?

(A) It can be negative
(B) It depends on motion
(C) It exists only in gases
(D) It is independent of mass

Correct Answer: B

Explanation:

Kinetic energy exists due to motion

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Question (50)

QN006281

A bicycle moving at 10 m/s has kinetic energy 500 J. If its speed becomes 20 m/s, the new kinetic energy will be:

(A) 1000 J
(B) 1500 J
(C) 2000 J
(D) 4000 J

Correct Answer: C

Explanation:

Doubling speed makes KE four times, so 500 × 4 = 2000 J

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Question (41)

A net force acting opposite to motion causes kinetic energy to:

Explanation:

Link:

Question (42)

A train moving with large speed requires long braking distance because it has:

Explanation:

Link:

Question (43)

A 2 kg object has kinetic energy 36 J. Its velocity is:

Explanation:

Link:

Question (44)

Work-energy theorem connects work done with:

Explanation:

Link:

Question (45)

A body of mass 8 kg moving at 5 m/s has kinetic energy:

Explanation:

Link:

Question (46)

Which activity from daily life shows conversion of work into kinetic energy?

Explanation:

Link:

Question (47)

A force does 90 J work on a body whose initial kinetic energy is 10 J. Final kinetic energy becomes:

Explanation:

Link:

Question (48)

A 1.5 kg body moving with velocity 4 m/s has kinetic energy:

Explanation:

Link:

Question (49)

Which statement is true about kinetic energy?

Explanation:

Link:

Question (50)

A bicycle moving at 10 m/s has kinetic energy 500 J. If its speed becomes 20 m/s, the new kinetic energy will be:

Explanation:

Link:

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