999+ Physics Questions Answers Explanation MCQ

Q:

As per Newton's law of gravitation, the force between two bodies is ________.

A) directly proportional to the product of their masses	B) directly proportional to the distance between them
C) directly proportional to the product of their radius	D) directly proportional to the product of forces

Answer & Explanation Answer: A) directly proportional to the product of their masses

Explanation:

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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:

Terminal velocity ________.

A) first increases before decreasing	B) is constant
C) first decreases before increasing	D) always keeps on increasing

Answer & Explanation Answer: B) is constant

Explanation:

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Q:

A body in equilibrium _______.

A) can move with constant acceleration	B) is always at rest
C) can move with constant velocity	D) can move with variable acceleration

Answer & Explanation Answer: C) can move with constant velocity

Explanation:

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Q:

While watching 3D movies at the theater, we have to wear special glasses because?

A) The glasses allow our left and right eyes to see different images	B) 3-D movies use special colors which cannot be sensed by the human eye
C) 3-D movies are brighter than ordinary movies and can hurt our eyes if seen directly	D) The glasses allow both the eyes to see similar images

Answer & Explanation Answer: A) The glasses allow our left and right eyes to see different images

Explanation:

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Q:

In a hydrogen atom, an electron moves in an orbit of radius $5.0 x 10^{- 11}$ m with a speed of $2.2 x 10^{6}$ m/s. What is the equivalent current? (Electronic charge = $1.6 x 10^{- 19}$ C)

A) 0.112 mA	B) 112 mA
C) 11.2 mA	D) 1.12 mA

Answer & Explanation Answer: D) 1.12 mA

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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.

Explanation:

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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 same as that of earth and radius is twice as that of earth is _________________.

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

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