999+ Physics Questions Answers Explanation MCQ

Q:

Which of the following is an example of thermoplastics?

A) Bakelite	B) Melamine
C) PVC	D) No option is correct

Answer & Explanation Answer: C) PVC

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Q:

An anemometer measures which of the following ?

A) Speed of light	B) Speed of wind
C) Speed of water current	D) Speed of satellites

Answer & Explanation Answer: B) Speed of wind

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Q:

The frequency of direct current is _____________

A) Zero	B) 50 HZ
C) 60 HZ	D) 100 HZ

Answer & Explanation Answer: A) Zero

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Q:

Weight (W) of a body can be given by the formula

A) W = mv	B) W = mf
C) W = ms	D) W = mg

Answer & Explanation Answer: D) W = mg

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Q:

An example of longitudinal waves (in gas as a medium) is ______.

A) heat waves	B) radio waves
C) electromagnetic waves	D) sound waves

Answer & Explanation Answer: D) sound waves

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Q:

Why boiling point of water decreases at high altitudes?

A) Because of high temperature	B) Because of low atmospheric pressure
C) Because of low temperature	D) Because of high atmospheric pressure

Answer & Explanation Answer: B) Because of low atmospheric pressure

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Q:

A broadcasting station transmits waves with a frequency of $71 x 10^{4}$ Hz and a speed of $3 x 10^{8}$ m/s. The wavelength of the wave is

A) 324.6 m	B) 422.5 m
C) 208.4 m	D) 418.8 m

Answer & Explanation Answer: B) 422.5 m

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Q:

What is the unit of the physical quantity Entropy?

A) watt per kelvin	B) newton per kelvin
C) pascal per kelvin	D) joule per kelvin

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