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प्रश्न
State the energy changes which take place when:
A battery lighting up a bulb.
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उत्तर
The electrical energy changes into heat energy and light energy.
संबंधित प्रश्न
Give one relevant example for the following transformation of energy:
Electrical energy to mechanical energy.
What is hydro energy?
A metal ball of mass 2kg is allowed to fall freely from rest from a height of 5m above the ground.
What the kinetic energy of the ball just before it hits the ground ?
Is it possible that a body may possess energy even when it is not in motion?
State the energy changes which take place when:
A bulb glows, when torchlight is switched on.
A body of mass 0.2 kg falls from a height of 10 m to a height of 6 m above the ground. Find the loss in potential energy taking place in the body. [g = 10ms−2]
Two bodies, A and B of equal mass are kept at heights 20 m and 30 m respectively. Calculate the ratio of their potential energies.
A body of mass m falls from a height h1 to a height h2, above the ground (h1 > h2). What is the loss of potential energy?
Match the pairs.
| Group 'A' | Group 'B' | ||
| (1) | Rolling object | (a) | Heat energy |
| (2) | Food | (b) | Atomic energy |
| (3) | Stretched bow | (c) | Kinetic energy |
| (4) | Sunlight | (d) | Potential energy |
| (5) | Uranium |
(e)
|
Chemical energy
|
