Physics Questions

Q:

Which among the following is a vector quantity?

A) Heat B) Angular momentum
C) Work D) Time
 
Answer & Explanation Answer: B) Angular momentum

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Q:

An object at rest will remain at rest and an object in motion will remain in motion until and unless it is acted upon by an external force. This is Newton's

A) First law B) Second law
C) Third law D) Fourth law
 
Answer & Explanation Answer: A) First law

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Q:

What is the unit of the physical quantity "Young's modulus"?

A) newton B) erg
C) joule D) pascal
 
Answer & Explanation Answer: D) pascal

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Q:

What is the resistance (in ohm) of an electrical component if a current of 0.5 A passes through it on application of 20 V of potential difference across it?

A) 10 B) 20
C) 80 D) 40
 
Answer & Explanation Answer: D) 40

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Q:

Even after sunset, the air near the Earth's surface continue to receive heat due to

A) Insolation B) Terrestrial Radiation
C) Conduction D) Convection
 
Answer & Explanation Answer: B) Terrestrial Radiation

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Q:

A bullet of mass 10gm is fired with a velocity of 40 m/s from a gun of mass 8 kg. Find the recoil velocity (in m/s) of the gun.

A) 2 B) 0.1
C) 4 D) 0.05
 
Answer & Explanation Answer: D) 0.05

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Q:

For every action, there is an equal and opposite reaction, is Newton's

A) First law B) Second law
C) Third law D) Fourth law
 
Answer & Explanation Answer: C) Third law

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Q:

The colour of a thin film is due to

A) Scattering B) Dispersion
C) Diffraction D) Interference
 
Answer & Explanation Answer: D) Interference

Explanation:

In physics, interference is a phenomenon in which two waves superpose to form a resultant wave of greater, lower, or the same amplitude. The color bands in thin films are a result of wavelength dependent interference caused by the close spacing of the surfaces of the film.

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