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Sources of Water Supply Questions and Answers

1.

The principal source of water in which water can be obtained through direct intake from natural lakes is called ______.

Exam Year(s)

DSSSB JE - 2023,

Answer: B

Water drawn directly from natural lakes, along with rivers, streams, ponds and reservoirs, is a surface water source. Rainwater is collected from the roofs or the ground as precipitation, groundwater is taken from wells and tube wells below the ground, and desalinated water is produced by treating sea or brackish water. None of those is taken by a direct intake from a lake.

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2.

Identify whether the following statements regarding the sources of water for water supply to a village are true or false.

S1: Infiltration galleries are provided for extraction of groundwater from wells in confined aquifers.

S2: The groundwater extracted from tube wells requires less treatment compared to the surface water from rivers.

Exam Year(s)

DSSSB JE - 2023,

Answer: B

S1 is false and S2 is true. Infiltration galleries (horizontal, porous conduits laid in water-bearing ground near a river or lake) collect water from the unconfined aquifer or by seepage from a surface source. They are not used for confined aquifers, which are tapped by wells. S2 is true: water that has filtered through the soil is usually clear and of low turbidity and bacterial count, so groundwater from tube wells needs less treatment than the water of a river, though it may need softening or removal of iron.

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