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प्रश्न
The ultimate source of energy stored in fossil fuels is:
(a) moon
(b) earth
(c) sun
(d) sea
उत्तर
sun
The sun is the ultimate source of energy stored in all fossil fuels.
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संबंधित प्रश्न
Name any one hydrocarbon fraction obtained during the fractional distillation of petroleum which is used as a domestic fuel.
What are fossil fuels? Give three examples of fossil fuels.
State whether the following is True or False.
Coal takes millions of years to form.
Name a few major producers of petroleum in the world.
State the main difference between the renewable and non-renewable sources of energy.
Name the major constituent of natural gas.
In a hydro power plant ______.
Why is there a need for harnessing non-conventional sources of energy? How can energy be harnessed from the sea in different ways?
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)
