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- 1. Fill in the Blank
Name the scientist who experimentally verified the law of conservation of energy.
- 2. Multiple Choice
When a body falls freely towards the Earth, then Its total energy:
Increases
Decreases
Remains constant
First increases then decreases
- 3. Multiple Choice
A 1kg mass has a kinetic energy of 1 joule when it's speed is
.45 m/s
1 m/s
1.4 m/s
4.4 m/s
- 4. Fill in the Blank
Sum of K.E. and P.E. of an object is it's
- 5. Multiple Choice
The speed of a particle is doubled, it's kinetic energy
Remains same
Becomes double
Becomes four times
Becomes half
- 6. Multiple Choice
What is the output energy of a nuclear power plant?
Electrical energy
Kinetic energy
Chemical energy
Heat energy
- 7. Open Ended
The potential energy of a freely falling object decreases progressively. Does this violate the law of conversation of energy. Why?
- 8. Open Ended
What is power? How do you differentiate kilowatt from kilowatt hour? Also Define 1 watt of power
- 9. Open Ended
What is the work done by the force of gravity on a satellite moving round the Earth? Justify your Answer.
- 10. Open Ended
Prove the formula K.E. = 1/2mv^2
- 11. 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
Does not change
Becomes twice to that of initial
Becomes 4 times that of initial
Becomes thrice to that of initial
- 12. Multiple Choice
The kinetic energy of a body is increased most by doubling its:
Speed
Density
Power
Mass
- 13. Multiple Choice
A road roller is rolling on an inclined road. Identify the energy associated with it.
Kinetic energy
Mechanical energy
Potential energy
Electrostatic energy
- 14. Multiple Choice
A car of mass 325kg is moving with 20 m/s . Calculate the Kinetic energy
60 Kj
72 Kj
65 Kj
78 Kj
- 15. Multiple Choice
Which one of the following is not the unit of energy?
Joule
Newton metre
Kilowatt hour
Kilowatt
- 16. Multiple Choice
How much energy does a 100 W electric bulb transfer in 1
minute ?
100 J
600 J
3600 J
6000 J
- 17. Fill in the Blank
__ is defined as the rate of doing work.
- 18. Multiple Choice
Which of the following is a source of energy?
Sun
Nuclear reactions
Tides
All of these
- 19. Multiple Choice
When a force acts on an object and displacement in the object is at an angle of q, maximum work is done, when q is
180°
90°
0°
60°
- 20. Open Ended
Can there be displacement of an object in the absence of any force acting on it? Briefly explain.
- Answer choicesTagsAnswer choicesTags