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Q:

A man lifts a luggage of 25 kg from the ground and puts it on the head, 2.5 m above the ground. If the value of g = 10 m/s2, then the value of work done by him on the luggage is

A) 22.5 J B) 225 J
C) 625 J D) 220 J
 
Answer & Explanation Answer: C) 625 J

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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:

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:

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:

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:

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:

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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0 939
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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