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प्रश्न
Why are fossil fuels called non-renewable sources of energy?
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उत्तर
Fossil fuels (coal, petrol, diesel etc.) are exhaustible i.e. if these are once finished can not be regenerated over a reasonable period of time. That is why fossil fuels are called non-renewable sources of energy.
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संबंधित प्रश्न
What is the function of anaerobic micro-organisms such as anaerobic bacteria in a biogas plant?
The constituent of biogas which makes it an excellent fuel is:
(a) butane
(b) methane
(c) propane
(d) ethane
Can you tell?
Which forms of energy from the sun are used in solar energy devices?
Which part of the solar cooker is responsible for greenhouse effect?
Choose the odd one:
Make a list of conventional and non-conventional sources of energy. Give a brief description of harnessing one nonconventional source of energy.
Various materials which are obtained from nature are called natural resources. Which of the following is not a natural resource?
Air is a natural resource and cannot be exhausted by human activities. It is known as inexhaustible natural resource. Which of the following is another inexhaustible natural resource?
Sunlight and air are inexhaustible natural resources. Comment.
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)
