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प्रश्न
Which of the following sources of energy are not derived from the sun?
Biomass, Wind, Ocean thermal energy, Geothermal energy, Nuclear fuels, Hydroelectricity, Wave energy, Coal, Petroleum, Tidal energy
उत्तर
The forms of energy that are not derived from the sun are geothermal energy, nuclear energy, hydroelectricity and energy obtained from coal and petroleum.
Geothermal energy is the heat energy obtained from the fission of radioactive materials present in the hot rocks inside the earth. Nuclear energy comes from the nucleus of an atom. Hydroelectricity is obtained from the flow of water.
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संबंधित प्रश्न
Name two energy sources that you would consider to be renewable. Give reasons for your choices.
Name any four fractions obtained from petroleum which are used as fuels.
Why is LPG considered a good fuel?
Apart from cattle dung, what other substances can be added to a biogas plant?
Compare and contrast biomass and hydroelectricity as sources of energy.
Which of the following is not an example of a biomass energy source?
(a) wood
(b) biogas
(c) atomic energy
(d) cow-dung
What is the main difference between renewable and non-renewable energy resources?
Make a list of conventional and non-conventional sources of energy. Give a brief description of harnessing one nonconventional source of energy.
The underlined word in the following sentence have been jumbled up. Write them in their correct form.
Nutsgilh is an example of inexhaustible natural resources.
Complete the crossword in figure with the help of the clues :
Across
1. Fuels obtained from dead remains of living organisms. (6, 5)
2. A process by which the various constituents of petroleum are separated. (8)
3. A porous black substance obtained from coal. (4)
4. Another name for motor fuel. (6)
Down
5. The substance obtained by carbonisation. (4)
6. Fuel for heavy motor vehicles. (6)
7. A petroleum product used for road surfacing. (7)
8. Dead remains of sea animals got converted into it. (9)
