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Online Tests
ECAT Pre General Science Physics Chapter 4 Work and Energy Online Test MCQs With Answers
Question # 1
The unit of work in CGS system is
Choose an answer
Joule
Erg
Dyne
Watt
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Question # 2
Which one is conservative force
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Electric force
Frictional force
Normal force
Air resistance
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Question # 3
The work done in moving a body between two points in a conservative field is independent of the
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Direction
Force applied
Path followed by the body
Power
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Question # 4
Work done on a body by gravity in lifting it up to certain height is
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Maximum
Minimum
Zero
Negative
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Question # 5
The commercial unit of electrical energy is :
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K Watt
KWH
Horse power
Joule
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Question # 6
The value of escape velocity of Earth planet comes out to be:
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11 m/sec
11 km/sec
11 km/hour
11 cm/sec
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Question # 7
The amount of coal used since 1945 up till now as compared to that used in the whole of history before that is
Choose an answer
Much more
Very small
No amount at all
None of these
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Question # 8
A field in which the work done is moving a body along closed path is zero is called:
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Nuclear filed
Conservative field
Gravitational field
Non-conservative field
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Question # 9
A solar cell converts energy of the Sun into:
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Heat energy
Magnetic energy
Light energy
Sound energy
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Question # 10
Which force is not a conservative force?
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Frictional force
Gravitational force
Electric force
Elastic spring force
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Question # 11
If one newton force acts on a body and displaces the body through 1m work done on body is
Choose an answer
1 dyne
1 joule
1KJ
1 Watt
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Question # 12
Work-energy principle states that work done on the body by applied force is equal to change in:
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Potential energy
Kinetic nergy
Linear momentum
None of these
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Question # 13
The work done on the body will be zero if:
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No force is applied on the body
Force is applied but no displacement
Angle between F(force) and d(displacement) is 90
°
All of these are correct
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Question # 14
If work is done at the rate of 2 k j per second, then total work done is half an hour will be:
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0.5 Kwn
2 Kwh
1 Kwh
None of these
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Question # 15
If force and displacement are in opposite direction, the work done is taken as
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Positive work
Negative work
Zero work
Infinite work
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