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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
Compare and contrast fossil fuels and the Sun as direct sources of energy
"The ignition temperature of a fuel is 80°C". What does this mean?
Write a short note on the pollution caused by burning fossil fuels.
Explain how, sun is considered to be the ultimate source of fossil fuels
The main constituent of petroleum gas is:
(a) methane
(b) ethane
(c) butane
(d) propane
The natural gas consists mainly of:
(a) methane
(b) ethane
(c) propane
(d) butane
The aviation fuel which is used in the engines of jet aeroplanes is:
(a) diesel
(b) kerosene
(c) petrol
(d) CNG
A substance X is added to LPG cylinders while filling so as to make the detection of leakage of LPG from the cylinder easy.
Name the substance X.
Compare the sun and the fossil fuels as the sources of energy.
Apart from cattle dung, what other substances can be added to a biogas plant?
Name the biomass which is still widely used as a source of heat energy in many household of our country.
Why is biogas considered an ideal fuel for domestic use?
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
The gravitational pull of the moon cause the sea-water to rise periodically.
(a) What name is given to the condition of the sea when water to rise periodically.
(b) What name is given to the condition of the sea when its raised water recedes?
(c) What name is given to the energy which can be harnessed from this natural phenomenon?
(d) Draw labelled diagram to show how this energy can be harnessed from this natural
Renewable source of energy is :
Fill in the blank
Coal, petroleum, and natural gas are _________fuels.
Name two forms of sea energy.
Coal is one of the ______ used to cook food.
Write True/False against the following statement.
Resources which are present in unlimited quantity in nature are called exhaustible natural resources.
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)
