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प्रश्न
What is energy?
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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.
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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.
One form of energy cannot be converted into another form.
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
The correct statement is
State the unit of energy and define it.
What is potential energy ? State its unit.
State two factors on which the potential energy of a body at a certain height above the ground depends.
Define the term efficiency of a machine.
Give a reason for the following.
The efficiency of a machine is always less than 100%.
Name the commercial unit of measurement of energy.
Name the quantity whose unit is :
(a) kilowatt
(b) kilowatt-hour
What is the common name of '1 kWh' of electrical energy?
A certain household consumes 650 units of electricity in a month. How much is this electricity in joules?
If the energy of a ball falling from a height of 10 metres is reduced by 40%, how high will it rebound?
Can you tell?
What should be taken into account for measuring work?
We make useful objects from a variety of substances. Another use of substances is that we get energy from some of them.
There is a car. Its tank is full of fuel but it does not move. Why is that?
Observe the picture and put a tick (✓) if work is done and put a cross (x) if work is not done.
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The work done on an object does not depend upon the
