Physics Questions

Q:

A good cricket fielder while catching a fast moving ball moves his hand along with the ball because ___.

A) He decreases the time of contact therefore increasing the force of contact B) He increases the time of contact thereby reducing the force of contact
C) He is afraid to take the ball and thus takes his hand out. D) He decreases the time of contact therefore reducing the force of contact
 
Answer & Explanation Answer: B) He increases the time of contact thereby reducing the force of contact

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Q:

Why does a sprinter keep running even after crossing the finishing line?

A) He wants to make sure that he crosses the line B) Inertia of rest takes some time to make him stop
C) Inertia of motion keeps him moving D) Friction between his shoes and the ground causes him to move beyond the line
 
Answer & Explanation Answer: C) Inertia of motion keeps him moving

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Q:

The speed of light in vacuum is estimated as ___ meters/second.

A) 3.00 x 108 B) 3.10 x 108
C) 3.12 x 108 D) 3.15 x 108
 
Answer & Explanation Answer: A) 3.00 x 108

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Q:

In which of the following activities is work NOT done?

A) Ashwin is standing on the platform B) Ashwin is running
C) Ashwin is walking D) Ashwin is climbing a bus
 
Answer & Explanation Answer: A) Ashwin is standing on the platform

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Q:

One horse power is

A) 68 watts B) 746 watts
C) 786 watts D) 764 watts
 
Answer & Explanation Answer: B) 746 watts

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Q:

What is the amount of work done when a body moves under a force of 1 N at a distance of 1 meter in the direction of the force?

A) 1 Joule B) 0.01 Joules
C) 100 Joules D) 10 Joules
 
Answer & Explanation Answer: A) 1 Joule

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Q:

Mechanical energy is equal to

A) Kinetic energy + Chemical energy B) Kinetic energy + Potential energy
C) Kinetic energy + Heat energy D) Kinetic energy + Electrical energy
 
Answer & Explanation Answer: B) Kinetic energy + Potential energy

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Q:

____ is used in periscope.

A) Plane mirror B) Prism
C) Concave lens D) Convex lens
 
Answer & Explanation Answer: A) Plane mirror

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