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प्रश्न
What is energy?
उत्तर १
The ability or capacity to do work is called energy.
उत्तर २
Energy is defined as the capacity to do work. S.I unit of work is Joule.
संबंधित प्रश्न
A certain household has consumed 250 units of energy during a month. How much energy is this in joules?
Write true or false of the following statement.
Potential energy changes into kinetic energy when it is put to use
Fill in the blank
The S.I.unit of energy is ______
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
When a bulb lights up on passing current, the change of energy is
Select the correct alternatives
The correct statement is
State the unit of energy and define it.
What do you mean by conservation of mechanical energy? State the condition when does it hold.
Give a reason for the following.
The efficiency of a machine is always less than 100%.
Name two units of power bigger than watt.
Name the quantity whose unit is :
(a) kilowatt
(b) kilowatt-hour
If the energy of a ball falling from a height of 10 metres is reduced by 40%, how high will it rebound?
The capacity that an object has for doing work is called ______.
Can you tell?
When can we say that displacement has taken place?
Which one of the following requires wind energy?
Define energy?
Which one of the following is not the unit of energy?
The weight of a person on planet A is about half that on the earth. He can jump up to 0.4 m in height on the surface of the earth. How high he can jump on planet A?
Define kilowatt hour.
