Class 10 - Physics - Sources of Energy
(a) A sunny day. (b) A cloudy day. (c) A hot day. (d) A windy day.
Correct option: - (b) a cloudy day.
A solar water heater uses solar energy to heat water. On a cloudy day, the sunlight does not reach the ground. Therefore solar energy is not available for the solar heater to work properly.
Which of the following is not an example of a bio-mass energy source?
(a) wood (b) gobar-gas (c) nuclear energy (d) coal
Correct option: - (c) nuclear energy.
Bio-mass is a source of energy which is obtained from plant materials and animal wastes. Nuclear energy is released by nuclear fission and fusion reaction.
Wood is a plant material, gobar gas is formed from animal dung and coal is a fossil fuel obtained from buried remains of plants and animals.
Most of the sources of energy we use represent stored solar energy. Which of the following is not ultimately derived from the Sun’s energy?
(a) geothermal energy (b) wind energy (c) nuclear energy (d) bio-mass.
Correct option: - (c) nuclear energy
Nuclear energy is released during nuclear fission and fusion. It is derived from Sun’s energy. But geothermal, wind energy and bio-mass they are the sources of energy which are derived either directly or indirectly from the sun’s energy.
Compare and contrast fossil fuels and the Sun as direct sources of energy.
Fossil fuels and sources of energy from the sun both are natural sources.
Compare and contrast bio-mass and hydroelectricity as sources of energy.
Contrast between bio-gas and hydroelectricity are as follows:-
Bio-mass and hydroelectricity both are non-conventional sources of energy.
Working cost of both sources is very low.
What are the limitations of extracting energy from —?
(a) The wind? (b) Waves? (c) Tides?
Limitations of extracting energy from waves:-
Limitations of extracting energy from tides:-
On what basis would you classify energy sources as:-
(a) Renewable and non-renewable?
(b) Exhaustible and inexhaustible?
Are the options given in (a) and (b) the same?
Options (a) and (b) are same.
For example: - Solar, bio-mass, ocean, geothermal and hydro energy sources.
Sources which are not replenished after their consumption and their stock are limited are known as non-renewable sources of energy.
For example: - Fossil fuels (coal, petrol, natural gas, etc.)
What are the qualities of an ideal source of energy?
The qualities of an ideal source of energy are as follows:-
What are the advantages and disadvantages of using a solar cooker? Are there places where solar cookers would have limited utility?
Advantages of a Solar Cooker:-
Disadvantages of a Solar Cooker:-
What are the environmental consequences of the increasing demand for energy?
What steps would you suggest to reduce energy consumption?
A few environmental consequences are following:-
Steps that can be taken to reduce energy consumption are following:-