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प्रश्न
Choose the correct answer.
Windmills have been used for many centuries in
विकल्प
the USA
the Netherlands
Russia
India
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उत्तर
Windmills have been used for many centuries in the Netherlands
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संबंधित प्रश्न
Give the names of two energy sources that you would consider to be exhaustible. Give reasons for your choices.
"The calorific value of cooking gas (LPG) is 50 kJ/g". What does it mean?
State any four characteristics of a good source of energy.
Most of the fuels contain carbon as one of the constituents. Name a fuel which has very high calorific value but not contain carbon.
State two important uses of natural gas
Why is LPG considered a good fuel?
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 fuel formed by the buried remains of large land plants?
The ultimate source of energy stored in fossil fuels is:
(a) moon
(b) earth
(c) sun
(d) sea
What is the function of anaerobic micro-organisms such as anaerobic bacteria in a biogas plant?
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
A certain form of energy is available due to the difference in the temperature of water at the surface of the ocean and its deeper levels.
(a) Name the form of energy.
(b) Is this energy ultimately derived from the sun or not?
(c) Explain how this form of energy can be converted into electricity.
(d) What is the minimum temperature difference in water at the surface of ocean and its deeper level which is required to operate power plants based on is energy?
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
The world's known coal reserves are expected to last for about:
(a) 200 years
(b) 400 years
(c) 500 years
(d) 100 years
What is meant by the renewable and non-renewable sources of energy? State two differences between them, giving two examples of each
Who is the odd one out?
Choose the incorrect statement regarding wind power
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 |
Why petrol is exhaustible natural resource, whereas sunlight is not? Explain.
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)
