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प्रश्न
Name two forms of sea energy.
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उत्तर
Two forms of sea energy are:
- Tidal energy
- Wave energy
संबंधित प्रश्न
What is a source of energy? What are the two main categories of the sources of energy?
Which of the following is not a renewable source of energy?
(a) wind
(b) flowing water
(c) fossil fuels
(d) fuel wood
A good fuel is one which possesses:
(a) high calorific value and low ignition temperature
(b) high calorific value and high ignition temperature
(c) high calorific value and moderate ignition temperature
(d) low calorific value and moderate ignition temperature
The ultimate source of energy stored in fossil fuels is:
(a) moon
(b) earth
(c) sun
(d) sea
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.
Which of the following is needed for the formation of biogas from cow-dung and which not?
Water, Oxygen
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
State the main difference between the renewable and non-renewable 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)
