Q10 of 51 Page 426

For producing electricity, the energy from flowing water is preferred to energy obtained by burning coke. State two reasons for it.

In case of hydro power plant, flowing water causes the turbines to rotate and the water can be refilled due to rains and hence Hydro energy is considered to renewable source of energy. Moreover, hydro energy does not release any kind of environmental pollutants.

Coke, on the other hand, belongs to the category of non-renewable sources of energy and also leads to the evolution of gaseous pollutants.


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8

Name four gases commonly present in biogas. State two advantages of using this gas over fossil fuels.

 9

Of the major requirement of different forms of energies, write which one is the greater requirement of India and which is the least? What is the percentage of the hydro energy requirement of India?

 11

Give a few examples of how our ancestors used the energy possessed by the wind and water.

 12

Out of two solar cookers, one was covered by a plane glass slab and the other was left open. Which of the two solar cookers will be more efficient and why?