999+ Physics Questions Answers Explanation MCQ

Q:

If the acceleration due to gravity on the surface of earth is g, then the acceleration due to gravity on the surface of a planet whose mass is double that of earth and radius is same as that of earth is _________________.

A) 2g	B) g
C) g/2	D) 4g

Answer & Explanation Answer: A) 2g

Explanation:

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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

Answer & Explanation Answer: A) increases

Explanation:

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Q:

Warm air is ______.

A) heavier than cold air hence warm air rises up	B) lighter than cold air hence warm air moves down
C) lighter than cold air hence warm air rises up	D) heavier than cold air hence warm air moves down

Answer & Explanation Answer: C) lighter than cold air hence warm air rises up

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Q:

Through which does light travel best?

A) water	B) air
C) vacuum	D) none

Answer & Explanation Answer: C) vacuum

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:

Which one of the following is not a property of electromagnetic waves?

A) Electromagnetic waves do not show interference and diffraction.	B) Oscillating electric field and magnetic field are perpendicular to each other.
C) Electromagnetic waves are transverse waves	D) Electromagnetic waves do not require a medium to propagate.

Answer & Explanation Answer: A) Electromagnetic waves do not show interference and diffraction.

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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 the equation of motion $2 as = v^{2} - u^{2}$ , s represents _________________.

A) speed	B) displacement
C) velocity	D) acceleration

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