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Chapter 8 Work Power and Energy - Test 3
1.
The kinetic energy of a body of mass 500 kg with a velocity of 10 m/S
-1
will be
1) 2x10
3
j
2) 2.5 x 10
4
j
3) 2.5 x10
3
J
4) 2x10
5
J
2.
Which unit is equal to joule per second
1) metre
2) newton
3) kilogram
4) watt
3.
If the velocity of a body is doubled then the K.E of the body become
1) Three times
2) Half
3) Double
4) four times
4.
The potential energy of a body depends upon its
1) velocity
2) height
3) Distance
4) Area
5.
The energy of water stored in a dam is
1) potential
2) Electrical energy
3) kinetic
4) Mechanical energy
6.
Work is said to be done when a force produces __________in a body.
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7.
For work a _________ should act on a body
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8.
Work is a ________ quantity.
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9.
If force and displacement are mutually perpendicular to each other then the work done is ______
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10.
In system international the unit of work is ________
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11.
One Joule = one Newton x one ___________
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12.
One mega joule is equal to ___________ Joule.
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13.
__________ is the rate of doing work with respect to time
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14.
In system international the unit of power is ___________
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15.
If one joule of work is done by a body in ___________ second then the power will be one watt.
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