What is the role of ultraviolet (UV) radiation in the water

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What is the role of ultraviolet (UV) radiation in the water purification systems?

1. It inactivates/kills the harmful microorganisms in water.

2. It removes all the undesirable odours from the water.

3. It quickens the sedimentation of solid particles, removes turbidity and improves the clarity of water.

Which of the statements given above is/are correct?

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1. ?? ???? ??? ???????? ???????????? ?? ????????? / ????? ???

2. ?? ???? ?? ??? ???????? ??? ?? ??????? ???

3. ?? ??? ???? ?? ?????? ?? ??? ???? ??, ?????? ??? ???? ?? ?? ???? ?? ???????? ??? ????? ???? ???

??? ??? ?? ????? ??? ?? ??? ?? ??? ?? / ????

[Ecology and Environment 2011-16 New Without Errors,UPSC IAS Prelims 2012]

A 1 only

1 ही

B 2 and 3 only

2 और 3 ही

C 1 and 3 only

केवल 1 और 3

D 1, 2 and 3

1, 2 और 3

Water turbidity (i.e., the amount of suspended & colloidal solids contained ...

???? ?? ????????? (??????, ??????? ???? ?? ??? ???? ??? ????? ??????? ?? ???????...

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