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प्रश्न
Fill in the blank
_______is the coal with the highest percentage of coal.
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उत्तर
Anthracite is coal with the highest percentage of coal.
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संबंधित प्रश्न
Why are we looking at alternate sources of energy?
Define ignition temperature of a fuel.
"The ignition temperature of a fuel is 80°C". What does this mean?
What is the main constituent of:
(1) petroleum gas?
(2) natural gas?
Why is the leakage of LPG detected easily although it is odourless? State the steps to be taken in case its leakage is detected in the kitchen.
Which fossil fuels were formed by the buried remains of small plants and animals?
What are the two ways in which cow-dung can be used as a fuel? Which of them is better and why?
Most of the sources of energy that we sue represent stored solar energy. Which of the following is not ultimately derived from the sun's energy?
(a) wind energy
(b) geothermal energy
(c) fossil fuels
(d) biomass
One of the following is not required in the formation of biogas in a biogas plant. This is:
(a) cow-dung
(b) water
(c) oxygen
(d) anaerobic bacteria
The fuel which is not obtained from biomass is:
(a) firewood
(b) cow-dung cakes
(c) coke
(d) charcoal
What type of nuclear reaction is responsible for the liberation of energy:
in a nuclear reactor?
Name five renewable and three non-renewable sources of energy.
Choose the correct answer.
The coal that has the highest percentage of carbon is
What do you know about wind energy?
Why should we conserve the non-renewable sources of energy?
Choose the incorrect statement regarding wind power
Why is there a need to harness non-conventional sources of energy? Give two main reasons.
What are the environmental consequences of using fossil fuels? Suggest the steps to minimise the pollution caused by various sources of energy including non-conventional sources of energy.
Match the items given in Column I with the items of Column II.
| Column I | Column II |
| (a) Used for road surfacing | (i) Black gold |
| (b) Natural gas | (ii) Vaseline and candles |
| (c) Petroleum | (iii) Bitumen |
| (d) Paraffin wax | (iv) CNG |
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)
