999+ Physics Questions Answers Explanation MCQ

Q:

The instrument that measures the ______________ is called an anemometer.

A) wind speed	B) pressure
C) humidity	D) rainfall

Answer & Explanation Answer: A) wind speed

Explanation:

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Q:

Which type of electromagnetic radiation has the longest wavelength?

A) UV rays	B) Radio waves
C) X rays	D) Infrared waves

Answer & Explanation Answer: B) Radio waves

Explanation:

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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

Explanation:

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Q:

The weight of a boy on the surface of the moon is 300 N. The weight of the same boy on the surface of the earth will be

A) 300 N	B) 50 N
C) 1800 N	D) 5 N

Answer & Explanation Answer: C) 1800 N

Explanation:

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Q:

Which of the following glows with special colour depending on the nature of gas in the fluorescent tube?

A) Plasma	B) Hydrogen
C) Helium	D) Bose-Einstein condensate

Answer & Explanation Answer: A) Plasma

Explanation:

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Q:

Work done by a passenger standing on a platform holding a suitcase weighing 10kg is

A) 980 J	B) 98 J
C) 0 J	D) 100 J

Answer & Explanation Answer: C) 0 J

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Q:

HEPA filters are used to remove microbes from

A) human tissues	B) air
C) medical instruments	D) liquids

Answer & Explanation Answer: B) air

Explanation:

High-efficiency particulate air (HEPA), also known as high-efficiency particulate absorbing and high-efficiency particulate arrestance, is an efficiency standard of air filter.

hepa-filters1596516018.png image

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Q:

Cryogenics is a branch of Physics that deal with ______.

A) very high temperatures	B) very low temperatures
C) growth of extremely small crystals	D) growth of extremely large crystals

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