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- 1. Multiple Choice
When a body falls freely towards the earth, then its total energy
(a) increases
(b) decreases
(c) remains constant
(d) first increases and then decreases
- 2. Multiple Choice
A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car
(a) does not change
(b) becomes twice to that of initial
(c) becomes 4 times that of initial
(d) becomes 16 times that of initial
- 3. Multiple Choice
In case of negative work the angle between the force and displacement is
(a)
(b)
(c)
(d )
- 4. Multiple Choice
An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass is 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same
(a) acceleration
(b) momenta
(c) potential energy
(d) kinetic energy
- 5. Multiple Choice
A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be (g =10 m s–2)
J
J
0.6 J
zero
- 6. Multiple Choice
Which one of the following is not the unit of energy?
(a) joule
(b) newton metre
(c) kilowatt
(d) kilowatt hour
- 7. Multiple Choice
The work done on an object does not depend upon the
(a) displacement
(b) force applied
(c) angle between force and displacement
(d) initial velocity of the object
- 8. Multiple Choice
Water stored in a dam possesses
(a) no energy
(b) electrical energy
(c) kinetic energy
(d) potential energy
- 9. Multiple Choice
A body is falling from a height h. After it has fallen a height , it will possess
(a) only potential energy
(b) only kinetic energy
(c) half potential and half kinetic energy
(d) more kinetic and less potential energy
- 10. Multiple Choice
The number of joules contained in 1kWh is
- 11. Multiple Choice
Two army persons A and B each of weight of 500N climb up a rope through a height of 10m.
A takes 20s while B takes 40s to achieve this task. what is ratio of the power of person A and B?
1:2
1:4
2:1
14:1
- 12. Multiple Choice
If speed of a car becomes 2 times, its kinetic energy becomes
4 times
8 times
16 times
12 times
- 13. Multiple Choice
Mechanical energy of a body includes
Kinetic energy only
Potential energy only
kinetic energy and potential energy
None of these
- 14. Multiple Choice
Commercial unit of energy is
Joule
kWh
Watt
Newton
- 15. Multiple Choice
When a coil spring is compressed, the work is done on the spring. the elastic potential energy
Increases
Decreases
Disappears
Remain unchanged
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