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प्रश्न
Fill in the blank
Solar cells use the power supplied by the ______.
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उत्तर
Solar cells use the power supplied by the Sunlight.
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संबंधित प्रश्न
What are the disadvantages of fossil fuels?
On what basis would you classify energy sources as
(a) renewable and non-renewable?
(b) exhaustible and inexhaustible?
Are the options given in (a) and (b) the same?
"The calorific value of cooking gas (LPG) is 50 kJ/g". What does it mean?
"The ignition temperature of a fuel is 80°C". What does this mean?
A non-renewable source of energy is:
(a) wood
(b) alcohol
(c) hydrogen gas
(d) natural gas
What is the composition of liquefied petroleum gas (LPG)?
Which gaseous fuel is being used increasingly in transport vehicles like cars and buses these days?
Explain why, natural gas is considered to be a good fuel.
What are the disadvantages of burning fossil fuels?
The ultimate source of energy stored in fossil fuels is:
(a) moon
(b) earth
(c) sun
(d) sea
Compare the sun and the fossil fuels as the sources of energy.
Which of the following is needed for the formation of biogas from cow-dung and which not?
Water, Oxygen
Why is biogas considered an ideal fuel for domestic use?
Suggest a safe and efficient method for the disposal of biowastes and sewage materials. How is this method advantageous to us?
Write any two advantages of using biogas.
Give an account of the use of solar energy.
Why are fossil fuels called non-renewable sources of energy?
Write True/False against the following statement.
Resources which are present in unlimited quantity in nature are called exhaustible natural resources.
Imagine that all the exhaustible natural resources are exhausted by human activities. Do you think survival of living beings would be possible? If yes, why? If not, why not?
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)
