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प्रश्न
State four ways for the judicious use of energy.
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उत्तर
Four ways for the judicious use of energy:
(a) The fossil fuels such as coal, petroleum, natural gas should be used only for the limited purposes when there is no other alternative source of energy available.
(b) The wastage of energy should be avoided.
(c) Efforts must be made to make use of energy for community or group purposes.
(d) The cutting of trees must be banned and more and more new trees must be roped to grow.
संबंधित प्रश्न
What is geothermal energy?
What name is given to the heat energy obtained from hot rocks inside the earth?
State two disadvantages of geothermal energy.
Write true or false of the following statement.
The energy of flowing water can be converted into electric energy (electricity).
Give one relevant example for the following transformation of energy :
Electrical energy to light energy.
State the changes in form of energy while producing hydro electricity.
Name the energy changes for the following:
bicycle brakes
What kind of energy is possessed in a situation when?
A stone, in a stretched catapult.
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 is taken from a height h to 2h. What is the increase in its potential energy?
