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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:

____ 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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Q:

The repeated reflection that results in persistence of sound is called

A) echo B) reflection
C) rarefaction D) reverberation
 
Answer & Explanation Answer: D) reverberation

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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:

This is NOT a use of a concave mirror?

A) As rear view mirrors B) In torches
C) As shaving mirrors D) In headlights
 
Answer & Explanation Answer: A) As rear view mirrors

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Q:

Which of the following physical quantities changes or tends to change the state of rest or of uniform motion of a body in a straight line?

A) Force B) Mass
C) Momentum D) Inertia
 
Answer & Explanation Answer: A) Force

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Q:

Sound is a

A) Electromagnetic wave B) Surface wave
C) Mechanical wave D) Tidal wave
 
Answer & Explanation Answer: C) Mechanical wave

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Q:

An electric motor converts

A) Mechanical energy into electrical energy B) Thermal energy into electrical energy
C) Electrical energy into mechanical energy D) Radiant energy into electrical energy
 
Answer & Explanation Answer: C) Electrical energy into mechanical energy

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