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प्रश्न
What is a source of energy? What are the two main categories of the sources of energy?
उत्तर
A source of energy is that which provides a required amount of energy in a convenient form for a long time.
There are basically two types of sources of energy:
a) Renewable source of energy
b) Non-renewable source of energy
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संबंधित प्रश्न
Which fossil fuels were formed by the buried remains of small plants and animals?
The main constituent of petroleum gas is:
(a) methane
(b) ethane
(c) butane
(d) propane
The energy in petrol originally came from the sun. Explain how it got into petrol.
What are the two ways in which cow-dung can be used as a fuel? Which of them is better and why?
Name the major component of biogas.
Fill in the blank
_______is the coal with the highest percentage of coal.
Can you tell?
What is ‘green energy’?
Can you tell?
Which forms of energy from the sun are used in solar energy devices?
Why is there a need for harnessing non-conventional sources of energy? How can energy be harnessed from the sea in different ways?
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)
