Q11 of 51 Page 426

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

In older days the energy of the wind was used for sailing purposes on a large scale as the wind used to drive the boat or raft in the direction of wind.

Water was used in water wheels which were used to grind the wheat into flour and also the water steam used in steam engine.




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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?

 10

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

 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?

 13

people living on hills often get sunburns on their skin. Which component of sunlight is responsible for this effect? Why is this effect generally not observed near sea level?