Physics Questions

Q:

The rate of change of linear momentum of a body is proportional to the ___________ acting on it.

A) impulse B) torque
C) force D) kinetic energy
 
Answer & Explanation Answer: C) force

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Q:

An example of longitudinal waves (in gas as a medium) is ______.

A) heat waves B) radio waves
C) electromagnetic waves D) sound waves
 
Answer & Explanation Answer: D) sound waves

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Q:

Why boiling point of water decreases at high altitudes?

A) Because of high temperature B) Because of low atmospheric pressure
C) Because of low temperature D) Because of high atmospheric pressure
 
Answer & Explanation Answer: B) Because of low atmospheric pressure

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Q:

The focal length of a concave mirror with a radius of curvature of 20.0 cm is :

A) 20 cm B) 5 cm
C) 10 cm D) 15 cm
 
Answer & Explanation Answer: C) 10 cm

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Q:

If a ball is thrown up, which of the following does not change?

A) Acceleration B) Speed
C) Potential energy D) Distance
 
Answer & Explanation Answer: A) Acceleration

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Q:

During uniform motion of an object along a straight line, the ________ remains constant with time.

A) Time B) Velocity
C) Acceleration D) Distance
 
Answer & Explanation Answer: B) Velocity

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Q:

Which one among the following is not an electro­magnetic wave?

A) X­-Ray B) R­-Ray
C) Cathode Ray D) Infrared Ray
 
Answer & Explanation Answer: C) Cathode Ray

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Q:

The property of metal by which it can be drawn into wires is called _____________.

A) maleability B) viscosity
C) ductility D) tensile strength
 
Answer & Explanation Answer: C) ductility

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