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प्रश्न
Name the quantity whose unit is :
(a) kilowatt
(b) kilowatt-hour
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उत्तर
(a) Power is the quantity whose unit is kilowatt (kW).
(b) Energy is the quantity whose unit is kilowatt- hour (kWh).
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संबंधित प्रश्न
Write true or false of the following statement.
One form of energy cannot be converted into another form.
Match the following columns
| COLUMN A | COLUMN B |
| 1. Running water | 1. heat energy |
| 2. Burning | 2. vibrations |
| 3.Energy | 3.atom bomb |
| 4.Sound energy | 4.kinetic energy |
| 5.Nuclear energy | 5.joule |
Select the correct alternatives
The correct statement is
State the unit of energy and define it.
State two factors on which the potential energy of a body at a certain height above the ground depends.
What do you mean by conservation of mechanical energy? State the condition when does it hold.
Match the following:
| Column A | Column B |
| (a) Needle | (1) class II lever |
| (b) Doorknob | (2) inclined plane |
| (c) Ramp | (3) Class I lever |
| (d) Lemon crusher | (4) Wheel and axle |
| (e) Seesaw | (5) wedge |
Name two units of power bigger than watt.
If the energy of a ball falling from a height of 10 metres is reduced by 40%, how high will it rebound?
We make useful objects from a variety of substances. Another use of substances is that we get energy from some of them.
When we have run a long distance, we feel tired. We have to stop. Why is that?
