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Question (11)

QN006242

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 decreases kinetic energy

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Question (12)

QN006243

An object initially has 80 J kinetic energy. After 30 J of negative work, its final kinetic energy is:

(A) 110 J
(B) 50 J
(C) 80 J
(D) 30 J

Correct Answer: B

Explanation:

Final KE = 80 – 30 = 50 J

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Question (13)

QN006244

A car gains 5000 J kinetic energy while accelerating. According to the work-energy theorem, work done on the car is:

(A) 0 J
(B) –5000 J
(C) 2500 J
(D) 5000 J

Correct Answer: D

Explanation:

Work done equals gain in kinetic energy

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Question (14)

QN006245

A 1 kg ball moving with speed 10 m/s has kinetic energy:

(A) 5 J
(B) 10 J
(C) 50 J
(D) 100 J

Correct Answer: C

Explanation:

KE = ½ × 1 × 10² = 50 J

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Question (15)

QN006246

Which quantity is always positive for a moving object?

(A) Work done
(B) Displacement
(C) Kinetic energy
(D) Force

Correct Answer: C

Explanation:

Kinetic energy cannot be negative

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Question (16)

QN006247

A body moving at 6 m/s has kinetic energy 72 J. Its mass is:

(A) 2 kg
(B) 3 kg
(C) 4 kg
(D) 6 kg

Correct Answer: C

Explanation:

72 = ½ × m × 36, so m = 4 kg

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Question (17)

QN006248

A truck and a bicycle move with the same speed. Which has greater kinetic energy?

(A) Bicycle
(B) Truck
(C) Both equal
(D) Cannot be determined

Correct Answer: B

Explanation:

Greater mass gives greater kinetic energy

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Question (18)

QN006249

Exact definition: “The work done by the net force acting on an object is equal to”

(A) Its momentum
(B) Its force
(C) Change in kinetic energy
(D) Product of force and time

Correct Answer: C

Explanation:

Statement of work-energy theorem

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Question (19)

QN006250

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 transforms into heat and deformation

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Question (20)

QN006251

A 2 kg object moving with speed 4 m/s comes to rest. The work done on it is:

(A) 16 J
(B) –16 J
(C) 8 J
(D) –8 J

Correct Answer: B

Explanation:

Initial KE = 16 J, final KE = 0, work = –16 J

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Question (11)

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

Explanation:

Link:

Question (12)

An object initially has 80 J kinetic energy. After 30 J of negative work, its final kinetic energy is:

Explanation:

Link:

Question (13)

A car gains 5000 J kinetic energy while accelerating. According to the work-energy theorem, work done on the car is:

Explanation:

Link:

Question (14)

A 1 kg ball moving with speed 10 m/s has kinetic energy:

Explanation:

Link:

Question (15)

Which quantity is always positive for a moving object?

Explanation:

Link:

Question (16)

A body moving at 6 m/s has kinetic energy 72 J. Its mass is:

Explanation:

Link:

Question (17)

A truck and a bicycle move with the same speed. Which has greater kinetic energy?

Explanation:

Link:

Question (18)

Exact definition: “The work done by the net force acting on an object is equal to”

Explanation:

Link:

Question (19)

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

Explanation:

Link:

Question (20)

A 2 kg object moving with speed 4 m/s comes to rest. The work done on it is:

Explanation:

Link:

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