999+ Physics Questions Answers Explanation MCQ

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:

A sound wave has a frequency of 4 kHz and a wavelength of 40 cm. The time taken by the sound wave to travel a distance of 3.2 km is

A) 0.5 s	B) 2.0 s
C) 4.0 s	D) 1.0 s

Answer & Explanation Answer: B) 2.0 s

Explanation:

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Q:

The force ultimately responsible for mass movement

A) erosion	B) gravity
C) deposition	D) weathering

Answer & Explanation Answer: B) gravity

Explanation:

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Q:

Which one of the following is the value of one nanometer?

A) 10-7 cm	B) 10-6 cm
C) 10-4 cm	D) 10-3 cm

Answer & Explanation Answer: A) 10-7 cm

Explanation:

1 nanometer (nm) of length

Equals: 0.00000010 centimetres (cm) in length.

This is equal to 10^-7 cm.

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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

Explanation:

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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:

Due to an acceleration of 4 m/s2 the velocity of a body increases from 10 m/s to 30 m/s in a certain period. Find the displacement (in m) of the body in that period.

A) 200	B) 250
C) 100	D) 125

Answer & Explanation Answer: C) 100

Explanation:

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Q:

Which among the following is false about displacement?

A) It can be positive, negative or zero	B) Displacement is never greater than Distance
C) Its SI unit is meter	D) It is always positive

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