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Q 1.
When the energy is possessed in motion there will be?
Ans.
Kinetic energy.
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Q 2.
When the energy is possessed in motion there will be?
Ans.
Kinetic energy.
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Q 3.
When the energy is possessed in motion there will be?
Ans.
Kinetic energy.
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Q 4.
When two identical bodies are in motion, the body will higher velocity has?
Ans.
Higher kinetic energy.
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Q 5.
Formula of work done?
Ans.
Force × displacement.
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Q 6.
Find the energy in kwh consumed in 10 hours by four devices of power 500W each?
Ans.
20 kwh.
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Q 7.
An electric heater is rated 1500 W. How much energy it use in 10 hours?
Ans.
15 kwh.
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Q 8.
A mass of 10 kgs is at a point A on a table. It is moved to a point B. If the line joining A and B is horizontal, what will be the work done?
Ans.
Zero.
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Q 9.
When a ball is eventually stops on reaching the ground its kinetic energy is?
Ans.
Zero.
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Q 10.
How many watts have 1 horse power?
Ans.
746 watt.
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Q 11.
Combination of kinetic and potential energy is called?
Ans.
Mechanical energy.
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Q 12.
How much the work done by the force of gravity on a satellite moving around the earth?
Ans.
Zero.
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Q 13.
Energy used in 1 hour at the rate of 1 kw is called?
Ans.
1 KWH.
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Q 14.
1 joule is equal to?
Ans.
1 Newton × 1 metre.
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Q 15.
If the displacement of the object is zero, how much work is done by the object?
Ans.
Zero.
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Q 16.
Name the unit of work?
Ans.
Joule.
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Q 17.
What will be the weight of freely failing body?
Ans.
Zero.
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Q 18.
SI unit of power?
Ans.
Watt.
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Q 19.
Define power?
Ans.
Rate of doing work is called power.
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Q 20.
Name two types of energy?
Ans.
Mechanical and Kinetic energy.
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Q 21.
Energy can only be transformed from one form to another, it can neither be created nor destroyed. This statement shows which law of Energy?
Ans.
Law of conservation of energy.
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