999+ Physics Questions Answers Explanation MCQ

Q:

The work done by centripetal force is ______.

A) positive	B) zero
C) negative	D) unity

Answer & Explanation Answer: B) zero

Explanation:

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Q:

Calculate the frequency (in Hz) of a sound wave of wavelength 5 m travelling with a speed of 360 m/s.

A) 1800	B) 36
C) 900	D) 72

Answer & Explanation Answer: D) 72

Explanation:

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Q:

Friction is caused by the ______________ on the two surfaces in contact.

A) irregularities	B) smoothness
C) densities	D) gaps

Answer & Explanation Answer: A) irregularities

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Q:

When body is accelerated--

A) Its velocity never changes.	B) Its speed will always change.
C) Its direction always changes.	D) Its speed may or may not change.

Answer & Explanation Answer: D) Its speed may or may not change.

Explanation:

Uniform circular motion, that is constant speed along a circular path, is an example of a body experiencing acceleration resulting in velocity of a constant magnitude but the change of direction

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Q:

Sextant is an instrument used in which of the following ?

A) Gynaecology	B) Navigation
C) Birth control	D) Medical treatment

Answer & Explanation Answer: B) Navigation

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Q:

Find the power of a convex lens if the image formed is at a distance of 20 cm from the lens when the object is placed on the other side of the lens at 25 cm from the optical centre?

A) 1 diopters	B) -9 diopters
C) 9 diopters	D) -1 diopters

Answer & Explanation Answer: C) 9 diopters

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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:

A galvanometer can be converted into a voltmeter by connecting with it a

A) high resistance in parallel	B) low resistance on parallel
C) high resistance on series	D) low resistance in series

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