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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
(i) The conversion of part of the energy into an undesirable form is called ______________.
(ii) For a given height h, __________________ the length l of the inclined plane, lesser will be the effort required.
Write true or false of the following statement.
The energy of flowing water can be converted into electric energy (electricity).
Name the type of energy (kinetic or potential) possessed by the following:
A moving bus.
Select the renewable and non-renewable sources of energy from the following:
Wood
Name the energy changes for the following:
electric ball
Show that the quantity 2K/v2 has the unit of mass, where K is the kinetic energy of the body.
Name the form of energy in which potential energy can change.
What kind of energy is possessed in a situation when?
A shooting arrow.
A body of mass 50 kg has a momentum of 3000 kg−1 ms. Calculate:
(j) the kinetic energy of the body.
(ii) the velocity of the body.
Unit of calorific value of a substance is ____________.
