999+ Physics Questions Answers Explanation MCQ

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

Explanation:

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Q:

The reflection formed by the plane mirror is ________________.

A) vertical inversion	B) a real image
C) lateral inversion	D) an enlarged image

Answer & Explanation Answer: C) lateral inversion

Explanation:

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Q:

Assuming that the charge of an electron is $1.6 x 10^{- 19} C$ , the number of electrons passing through a section of wire per second when the wire carries a current of 1 A is

A) 6.25 x 1018 C	B) 1.6 x 10-19 C
C) 1.6 x 1019 C	D) 0.625 x 1017 C

Answer & Explanation Answer: A) 6.25 x 1018 C

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Q:

What is the unit of the physical quantity "Capacitance"?

A) weber	B) farad
C) tesla	D) ohm

Answer & Explanation Answer: B) farad

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Q:

Calculate the pressure (in Pa) if a thrust of 800 N is applied to an area of 16 m2.

A) 128	B) 100
C) 64	D) 50

Answer & Explanation Answer: D) 50

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Q:

Which one of the following statements is not correct?

A) The response of the ear to sound of increasing intensity is approximately logarithmic.	B) The sensitivity of the human ear does not vary with the frequency of the sound.
C) When two or more waves traverse the same medium, the displacement of any element of the medium is the algebraic sum of the displacements due to each wave.	D) Longitudinal waves can travel in all media-solids, liquids and gases.

Answer & Explanation Answer: B) The sensitivity of the human ear does not vary with the frequency of the sound.

Explanation:

The human ear can respond to minute pressure variations inthe air if they are in the audible frequency range, roughly 20 Hz -20 kHz. In fact, tests conducted show an increased sensitivity in the 3000 Hz range which is the optimal amplification frequency in the human ear. So, the sensitivity of the human ear varies with the frequency of the sound.

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Q:

In an optical fibre the signal is transmitted

A) in a straight line path	B) In a curved path
C) due to total internal reflection	D) Due to refraction

Answer & Explanation Answer: D) Due to refraction

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2 1034

Q:

If the force applied on the object is in the direction of its motion, the speed of the object __________.

A) increases	B) stops
C) decreases	D) no effect

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