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Physics Class 11 - Chapter 4
Work And EnergyTest - 5
1.
One mega watt hour is equal to?
a) 36x10
12
J
b) 36x10
8
J
c) 36x10
10
J
d) 36x10
6
J
2.
The source of geothermal energy is?
a) All of these
b) Decay of radioactive element in the earth
c) Compression of material in the earth
d) Residual lost in the earth
3.
Power of a any body is?
a) ts ability to do work
b) Rate of doing work
c) All of these
d) Its maximum strength
4.
Which of the following is conservative force?
a) Magnetic
b) Gravitational
c) All of these
d) Electric
5.
When two protons are brought together?
a) Potential energy increases
b) Kinetic energy increases
c) Kinetic energy decreases
d) Potential energy decreases
6.
The relation between escape velocity and orbital velocity is?
a) V
esc
=2V
o
b) V
esc
=V
o
c) V
esc
=1.41V
o
d) V
es
=1/2V
o
7.
The escape velocity from earth surface in kms-1 is?
a) 7.5kms
b) 4.5kms
c) 11kms
d) 9.6kms
8.
If moon radius is 1600 km and g on its surface is 1.6ms-2,then the escape velocity on the moon is?
a) 50.6ms
b) 85ms
c) None of these
d) 100ms
9.
The consumption of energy by a 60 watt bulb in 2 sec is?
a) 120J
b) 40J
c) 0.02J
d) 65J
10.
Work has the dimension as that of?
a) Acceleration
b) Force
c) Velocity
d) Torque
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