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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)
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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
Why are fossil fuels classified as non-renewable source of energy?
Name two sources of energy that you think are renewable. Give reason for your choice.
The calorific values of three fuels A, B and C are 33 kJ/g, 48 kJ/g and 150 kJ/g, respectively. A is solid, B is liquid and C is a gas at room temperature. One combustion, both A and B produce carbon dioxide while C explodes forming steam. B and C leave no residue after combustion while A leaves behind some solid residue. Which one of the three fuels is the most ideal? Give two reasons to support your answer.
What is meant by conventional sources of energy? Write the names of two conventional sources of energy.
Which fossil fuel formed by the buried remains of large land plants?
A substance X is added to LPG cylinders while filling so as to make the detection of leakage of LPG from the cylinder easy.
How does substance X make the detection of leakage of LPG easy?
Fill in the blank
_______is the coal with the highest percentage of coal.
Choose the correct answer.
The coal that has the highest percentage of carbon is
Acid rain happens because ______.
Why is there a need to harness non-conventional sources of energy? Give two main reasons.
