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प्रश्न
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)
उत्तर
Across
1. Fossil fuels
2. Refining
3. Coke
4. Petrol
Down
5. Coal
6. Diesel
7. Bitumen
8. Petroleum
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संबंधित प्रश्न
Name two energy sources that you would consider to be renewable. Give reasons for your choices.
Write any two advantages of using biogas.
Which of the following is not an example of a biomass energy source?
(a) wood
(b) biogas
(c) atomic energy
(d) cow-dung
The fuel which is not obtained from biomass is:
(a) firewood
(b) cow-dung cakes
(c) coke
(d) charcoal
State the main difference between the renewable and non-renewable sources of energy.
Tidal energy is ______ type of energy.
In a hydro power plant ______.
Choose the odd one:
Write True/False against the following statement.
Oxygen in air is an exhaustible natural resource.
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.
