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Online Tests
ECAT Pre General Science Physics Chapter 4 Work and Energy Online Test MCQs With Answers
Question # 1
When velocity of moving body is doubled, the quantity which is also doubled is its:
Choose an answer
K.E.
Acceleration
Momentum
P.E.
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Question # 2
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 # 3
Tick the conservation force:
Choose an answer
Tension in a string
Air resistance force
Elastic spring
Frictional force
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Question # 4
Work has the dimension as that of:
Choose an answer
Torque
Angular momentum
Linear momentum
Power
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Question # 5
If work is done at the rate of 2 k j per second, then total work done is half an hour will be:
Choose an answer
0.5 Kwn
2 Kwh
1 Kwh
None of these
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Question # 6
Work done along a closed path in a gravitational field is:
Choose an answer
Maximum
Minimum
Zero
Unity
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Question # 7
Work is a always done on a body when
Choose an answer
A force acts on it
It moves through certain distance
None of A or B is correct
Both A and B are correct
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Question # 8
Escape velocity from surface of Moon as compared to that from Earth surface is:
Choose an answer
Greater
Smaller
Equal
None of thes
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Question # 9
The work done on the body will be zero if:
Choose an answer
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 # 10
In the force applied is parallel to the direction of motion, then work done is:
Choose an answer
Maximum
Minimum
Zero
None of these
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Question # 11
When two protons are brought are brought closer potential energy of both of them:
Choose an answer
Increases
Decreases
Remains same
None of these
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Question # 12
The consumption of energy by a 60 W bulb in 2 minutes is:
Choose an answer
2 watt-hour
120 watt-hour
30 watt-hour
None of these
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Question # 13
The work done by a force keeping an object in circular motion with constant speed is:
Choose an answer
Zero J.
0.1 J
1 J
0.01 J
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Question # 14
Most of the geysers occur in:
Choose an answer
Volcanic regions
Magnetic regions
Northern region
None of these
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Question # 15
Work done in lower and bucket into the well is:
Choose an answer
Zero
Positive
Negative
None of these
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Question # 16
When a body moves against the force of friction on a horizontal plane, the work done by the body is:
Choose an answer
Positive
Negative
Zero
None of these
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Question # 17
In the force applied to parallel to the direction of motion, then the work done is:
Choose an answer
Positive
Negative
Zero
None of these
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Question # 18
Which one is conservative force
Choose an answer
Electric force
Frictional force
Normal force
Air resistance
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Question # 19
A solar cell converts energy of the Sun into:
Choose an answer
Heat energy
Magnetic energy
Light energy
Sound energy
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Question # 20
When a force of 0.5 N displaces a body through a distance of 2m in the direction of force, the work done is:
Choose an answer
0.5 J
2 J
0.25 J
1 J
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Question # 21
The ultimate source of money sources of energy is:
Choose an answer
Sun
Air
Water
Petroleum
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Question # 22
A body moves a distance of 10 m along a straight line under the action of a force of 5 N and work done is 25J. the angle which the force makes with the direction of motion will be:
Choose an answer
60
°
90
°
30
°
0
°
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Question # 23
Teh consumption of energy by a 1000 watt heater in half an hour is:
Choose an answer
5 Kwh
0.5 Kwh
2.5 Kwh
3.2 Kwh
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Question # 24
Work done by the force of friction is always
Choose an answer
Positive
Zero
Negative
Maximum
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Question # 25
Work done is maximum when angle between force and displacement is:
Choose an answer
0
°
90
°
180
°
None of these
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Question # 26
The commercial unit of electrical energy is :
Choose an answer
K Watt
KWH
Horse power
Joule
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Question # 27
When force and displacement are perpendicular to each other than work is equal to
Choose an answer
Unity
Infinity
Zero
-Fd
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Question # 28
The value of escape velocity of Earth planet comes out to be:
Choose an answer
11 m/sec
11 km/sec
11 km/hour
11 cm/sec
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Question # 29
If force and displacement are in opposite direction, the work done is taken as:
Choose an answer
Positive work
Negative work
Zero work
Infinte work
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Question # 30
The angle between centripetal force and displacement of the body moving in a circle is:
Choose an answer
0
°
90
°
180
°
None of these
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