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प्रश्न
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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उत्तर
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संबंधित प्रश्न
Write true or false of the following statement.
In an electric fan, electrical energy changes into the mechanical energy.
Write true or false of the following statement.
Potential energy changes into kinetic energy when it is put to use
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 the commercial unit of measurement of energy.
How many joules are there in one kilowatt-hour?
A cell converts one form of energy into another form. Name the two forms.
If the energy of a ball falling from a height of 10 metres is reduced by 40%, how high will it rebound?
What energy transfer happen in a car engine?
