Advertisements
Advertisements
प्रश्न
MULTIPLE CHOICE TYPE
In an electric cell which in use, the change in energy is from:
विकल्प
Electrical to mechanical
Electrical to chemical
Chemical to mechanical
Chemical to electrical
Advertisements
उत्तर
Chemical to electrical
Hint: When current is drawn from an electric cell, the chemical energy stored in it changes into electrical energy.
संबंधित प्रश्न
Derive a relationship between S.I. and C.C.S. unit of work
A weight lifter lifted a load of 200 kgf to a height of 2.5 m in 5 s. Calculate:
- the work done, and
- the power developed by him. Take g = 10 N kg-1
A vessel containing 50 kg of water is placed at a height 15 m above the ground. Assuming the gravitational potential energy at ground to be zero, what will be the gravitational potential energy of water in the vessel? (g = 10 m s-2)
How many watts equal one horse power?
Distinguish between work and power.
Fill in the boxe to show the corresponding energy transformation.

Give an example
Chemical energy changes to heat energy.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
Food grains are getting dried in the sun.
State whether work is done or not, by writing yes or no, in the following case:
A boy climbs up 20 stairs.
