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प्रश्न
Why is the use of wood as a fuel not advisable although wood is a renewable source of energy?
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उत्तर
Wood is obtained from trees. Hence, trees need to be cut down for wood to be used as a fuel.
Also, burning wood releases a lot of smoke which pollutes the atmosphere.
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संबंधित प्रश्न
What is meant by a renewable source of energy? Give two examples of renewable sources of energy.
State two important uses of natural gas
Explain why, natural gas is considered to be a good fuel.
Fossil fuels are energy rich compounds of an element X which were originally made by the plants with help of sun's energy.
Name the element X.
Choose the correct answer.
Windmills have been used for many centuries in
Why are fossil fuels called non-renewable sources of energy?
Choose the odd one:
Exhaustible natural resources are
Fill in the blanks and complete the story.
About 300 million years ago, the earth had dense ______ in low lying wetland areas. Due to natural processes like ______, these forests got buried under the ______. As more ______ deposited over them, they were compressed. The ______ also rose as they sank deeper and deeper. Under high ______ and high ______, dead plants got slowly converted into coal.
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)
