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Question (41)

QN006322

Which statement is correct about energy?

(A) Energy can be created permanently
(B) Energy has no units
(C) Energy can change from one form to another
(D) Energy is always visible

Correct Answer: C

Explanation:

Energy changes from one form to another

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Question (42)

QN006323

A body with kinetic energy 200 J moves with velocity 10 m/s. Its mass is:

(A) 2 kg
(B) 4 kg
(C) 6 kg
(D) 8 kg

Correct Answer: B

Explanation:

200 = ½ × m × 100, so m = 4 kg

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Question (43)

QN006324

Which form of energy is used in battery-operated toys?

(A) Chemical and electrical energy
(B) Nuclear energy only
(C) Sound energy only
(D) Heat energy only

Correct Answer: A

Explanation:

Batteries store chemical energy and provide electrical energy

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Question (44)

QN006325

The SI unit of all forms of energy is:

(A) Watt
(B) Newton
(C) Joule
(D) Pascal

Correct Answer: C

Explanation:

Joule is the SI unit of energy

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Question (45)

QN006326

A pendulum at its highest position possesses maximum:

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

Correct Answer: B

Explanation:

Height is maximum at extreme position

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Question (46)

QN006327

Which activity demonstrates conversion of muscular energy into mechanical energy?

(A) Sleeping
(B) Running
(C) Reading
(D) Watching television

Correct Answer: B

Explanation:

Muscular energy produces motion during running

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Question (47)

QN006328

A 0.5 kg ball moving at 20 m/s has kinetic energy:

(A) 25 J
(B) 50 J
(C) 100 J
(D) 200 J

Correct Answer: C

Explanation:

KE = ½ × 0.5 × 400 = 100 J

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Question (48)

QN006329

Which energy transformation occurs in a loudspeaker?

(A) Sound → Electrical
(B) Electrical → Sound
(C) Mechanical → Heat
(D) Heat → Light

Correct Answer: B

Explanation:

Loudspeaker converts electrical energy into sound

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Question (49)

QN006330

The energy stored in water held behind a dam is mainly:

(A) Sound energy
(B) Gravitational potential energy
(C) Chemical energy
(D) Nuclear energy

Correct Answer: B

Explanation:

Stored water has gravitational potential energy

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Question (50)

QN006331

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 (41)

Which statement is correct about energy?

Explanation:

Link:

Question (42)

A body with kinetic energy 200 J moves with velocity 10 m/s. Its mass is:

Explanation:

Link:

Question (43)

Which form of energy is used in battery-operated toys?

Explanation:

Link:

Question (44)

The SI unit of all forms of energy is:

Explanation:

Link:

Question (45)

A pendulum at its highest position possesses maximum:

Explanation:

Link:

Question (46)

Which activity demonstrates conversion of muscular energy into mechanical energy?

Explanation:

Link:

Question (47)

A 0.5 kg ball moving at 20 m/s has kinetic energy:

Explanation:

Link:

Question (48)

Which energy transformation occurs in a loudspeaker?

Explanation:

Link:

Question (49)

The energy stored in water held behind a dam is mainly:

Explanation:

Link:

Question (50)

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

Explanation:

Link:

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