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प्रश्न
What are fossil fuels?
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उत्तर
Fuels formed in the geological past from the remains of living organisms and plants etc. Examples of fossil fuels are coal, petroleum, and natural gas, etc.
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संबंधित प्रश्न
Name two energy sources that you would consider to be renewable. Give reasons for your choices.
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?
What is the difference between a renewable and a non-renewable source of energy? Explain with examples.
Explain why, natural gas is considered to be a good fuel.
Why is LPG considered a good fuel?
Explain how, sun is considered to be the ultimate source of fossil fuels
The ultimate source of energy stored in fossil fuels is:
(a) moon
(b) earth
(c) sun
(d) sea
Name the constituents of biogas.
Apart from cattle dung, what other substances can be added to a biogas plant?
One of the following is not required in the formation of biogas in a biogas plant. This is:
(a) cow-dung
(b) water
(c) oxygen
(d) anaerobic bacteria
What type of nuclear reaction is responsible for the liberation of energy:
in the sun?
What are non-renewable resources of energy? Give two examples of such resources.
Why is the use of wood as a fuel not advisable although wood is a renewable source of energy?
State whether the following is True or False.
China, the USA, and Spain are major producers of wind energy.
Name a few major producers of petroleum in the world.
Describe the four major types of coal.
Who is the odd one out?
Coal is one of the ______ used to cook food.
Why petrol is exhaustible natural resource, whereas sunlight is not? Explain.
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)
