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Question (21)

QN006352

Which example best represents mechanical energy?

(A) Hot iron rod
(B) Moving cricket ball
(C) Burning candle
(D) Glowing bulb

Correct Answer: B

Explanation:

Moving objects possess kinetic energy.

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Question (22)

QN006353

A 2 kg object has kinetic energy 64 J. Its speed is:

(A) 4 m/s
(B) 6 m/s
(C) 8 m/s
(D) 10 m/s

Correct Answer: C

Explanation:

64 = ½ × 2 × v², so v = 8 m/s.

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Question (23)

QN006354

At the lowest point of a swing, the energy is mainly:

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

Correct Answer: C

Explanation:

Velocity is maximum at lowest point.

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Question (24)

QN006355

A body of mass 8 kg raised to height 3 m has potential energy:

(A) 24 J
(B) 120 J
(C) 240 J
(D) 480 J

Correct Answer: C

Explanation:

PE = 8 × 10 × 3 = 240 J.

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Question (25)

QN006356

Which statement is correct about mechanical energy?

(A) It can never change form
(B) It includes only kinetic energy
(C) It may convert between kinetic and potential forms
(D) It is measured in watts

Correct Answer: C

Explanation:

Mechanical energy changes between KE and PE.

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Question (26)

QN006357

A 1 kg object moving at 12 m/s has kinetic energy:

(A) 36 J
(B) 72 J
(C) 144 J
(D) 288 J

Correct Answer: B

Explanation:

KE = ½ × 1 × 12² = 72 J.

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Question (27)

QN006358

A coconut falling from a tree shows conversion of:

(A) Electrical energy into heat energy
(B) Potential energy into kinetic energy
(C) Sound energy into light energy
(D) Chemical energy into nuclear energy

Correct Answer: B

Explanation:

Falling converts PE into KE.

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Question (28)

QN006359

A body possesses 150 J potential energy at height 5 m. Its mass is:

(A) 2 kg
(B) 3 kg
(C) 5 kg
(D) 15 kg

Correct Answer: B

Explanation:

m = 150 ÷ (10 × 5) = 3 kg.

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Question (29)

QN006360

If mass doubles and velocity remains same, kinetic energy becomes:

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

Correct Answer: C

Explanation:

KE is directly proportional to mass.

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Question (30)

QN006361

A roller coaster at the top of a hill possesses maximum:

(A) Heat energy
(B) Potential energy
(C) Sound energy
(D) Electrical energy

Correct Answer: B

Explanation:

Greater height gives greater potential energy.

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Question (21)

Which example best represents mechanical energy?

Explanation:

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Question (22)

A 2 kg object has kinetic energy 64 J. Its speed is:

Explanation:

Link:

Question (23)

At the lowest point of a swing, the energy is mainly:

Explanation:

Link:

Question (24)

A body of mass 8 kg raised to height 3 m has potential energy:

Explanation:

Link:

Question (25)

Which statement is correct about mechanical energy?

Explanation:

Link:

Question (26)

A 1 kg object moving at 12 m/s has kinetic energy:

Explanation:

Link:

Question (27)

A coconut falling from a tree shows conversion of:

Explanation:

Link:

Question (28)

A body possesses 150 J potential energy at height 5 m. Its mass is:

Explanation:

Link:

Question (29)

If mass doubles and velocity remains same, kinetic energy becomes:

Explanation:

Link:

Question (30)

A roller coaster at the top of a hill possesses maximum:

Explanation:

Link:

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