999+ Physics Questions Answers Explanation MCQ

Q:

The speed of sound in air at $0^{°}$ is

A) 331 m/s	B) 330 m/s
C) 330 ms	D) 331 ms

Answer & Explanation Answer: A) 331 m/s

Explanation:

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Q:

Calculate the power (in W) of an engine if it can perform 120 J of work in 3 seconds.

A) 360	B) 80
C) 180	D) 40

Answer & Explanation Answer: D) 40

Explanation:

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Q:

Quality of transmission depends upon

A) Nature of signal only	B) Nature of medium only
C) Both (A) and (B)	D) Neither A nor B

Answer & Explanation Answer: C) Both (A) and (B)

Explanation:

Quality of transmission is governed both by nature of signal and nature of communication channel/medium.

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Q:

We obtain average _____________ by dividing the total energy consumed by the total time taken.

A) force	B) power
C) torque	D) momentum

Answer & Explanation Answer: B) power

Explanation:

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Q:

Sound becomes hazardous noise pollution at decibels?

A) above 120 db	B) above 80 db
C) above 50 db	D) above 30 db

Answer & Explanation Answer: A) above 120 db

Explanation:

Sound intensity is measured in decibels(db). Sound pollution above 120 db becomes more hazardous and have adverse affects on human life.

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Q:

If a body weighs 12N on the surface of the earth, how much will it weigh on the surface of the moon where acceleration due to gravity is only one-sixth of that on earth's surface?

A) 12N	B) 2N
C) 10N	D) 6N

Answer & Explanation Answer: B) 2N

Explanation:

Weight is mass x g. Since mass is constant and g is only ${\frac{1}{6}}^{t h}$ of that on the earth. The weight on the moon is only ${\frac{1}{6}}^{t h}$ of that on the earth.

Therefore 2N i.e (b) is the answer.

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Q:

Which of the following is a bad conductor of heat?

A) Wood	B) Diamond
C) Water	D) Mica

Answer & Explanation Answer: A) Wood

Explanation:

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Q:

A person is sitting in a moving train and is facing the engine. He tosses up a coin and the cion fals behind him. It can be concluded that the train is moving:

A) forward and loosing speed	B) forward and gaining speed
C) forward and uniform speed	D) backward with uniform speed

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