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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.
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संबंधित प्रश्न
State the energy change in the following device while in use:
A loudspeaker
Fill in the blank
The energy possessed by a body due to its motion is called ______ energy.
Give one example of a body that has potential energy, due to its position at a height.
What do you understand by the kinetic energy of a body?
A light mass and a heavy mass have equal momentum. Which will have more kinetic energy?
(Hint : Kinetic energy K = P2/2m where P is the momentum.)
State two characteristic which a source of energy must have.
Name two examples in which the mechanical energy of a system remains constant.
The following are some of the energy transformations.
A. Electrical to light
B. Work to heat
C. Chemical to light
D. Electrical to sound
E. Mechanical to electrical
Identify the energy transformation that takes place in the following by inserting the corresponding letter in the shape provided.
(i) A candle flame
(ii) A torch is lighted
(iii) A microphone is used in a meeting
(iv) A cycle dynamo
(v) A piece of metal is being filed
State the energy changes which take place when:
Water stored in dams rotates turbine connected to a dynamo.
