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All India Exam - 2017
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Q6 of 40 Page 1

Explain two main advantages associated with water harvesting at the community level.

The two advantages are:

a. Recharging of wells increases the level of ground water.


b. The water can be stored in the rainy season and we can use it when there are no rains or when there is water scarcity.


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4

An object is placed at a distance of 30 cm from a concave lens of focal length 15 cm. List four characteristics (nature, position, etc.) of the image formed by the lens.

5

State two advantages of conserving (i) forests, and (ii) wild-life.

7

Write the structural formula of ethanol. What happens when it is heated with an excess of conc. H2SO4 at 443 K? Write the chemical equation for the reaction stating the role of conc. H2SO4 in this reaction.

8

Distinguish between esterification and saponification reactions with the help of the chemical equations for each. State one use of each (i) esters, and (ii) saponification process.

Questions · 40
All India Exam - 2017
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