Physics Questions

Q:

Sound travels at a speed of 333 m/s in the air, thus, in 1 s, a distance of 333 m is travelled by

A) source B) disturbace
C) particles D) receiver
 
Answer & Explanation Answer: B) disturbace

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Q:

Which of the following glows with special colour depending on the nature of gas in the fluorescent tube?

A) Plasma B) Hydrogen
C) Helium D) Bose-Einstein condensate
 
Answer & Explanation Answer: A) Plasma

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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:

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

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Q:

With reference to gravity, what is G called?

A) Gravitational constant B) Gravitational attraction
C) Gravitational force D) Acceleration due to gravity
 
Answer & Explanation Answer: A) Gravitational constant

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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

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Q:

The pitch of a sound depends on its ____.

A) frequency B) wavelength
C) amplitude D) timbre
 
Answer & Explanation Answer: A) frequency

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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

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