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प्रश्न
What should be the characteristic of a source of energy?
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उत्तर
A good source of energy should have the following characteristics:
(i) It should do a large amount of work per unit mass or volume.
(ii) It should have a high calorific value.
(iii) It should be easily accessible over a long period of time.
(iv) It should be economical and easy to store and transport.
(v) It should be safe and convenient to use.
संबंधित प्रश्न
State two advantage of producing hydroelectricity.
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A boy does work when he pushes against a brick wall. (yes/no).
An electric motor drives a machine which lifts a mass of 4 kg through a height of 10 m in 5 s at a constant speed. Assuming g = 10 ms-2, calculate
(i) the amount of work done, (ii) the power of the machine.
Fill in the boxe to show the corresponding energy transformation.

State the energy changes which take place when An electric bulb glows when it is connected to a source of electric current.
