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Q: Which of the following statements is INCORRECT?
  • A. Surface sources of water are generally contaminated and cannot be used without treatment.
  • B. The natural outflow of groundwater at the Earth’s surface is said to form a spring.
  • C. A cavity type tube well draws water from the bottom as well as from the sides of the well.
  • D. Infiltration well is a sub-surface source of water.
Correct Answer: Option C - The surface supplies are generally contaminate and cannot be used without any treatment. • The natural outflows of ground water takes place through springs and river bed, when the ground water pressure is higher than surface water. Sub-surface source of water–Aquifers, artesian well, infiltration well, infiltration gallery etc. Cavity type:- In this type of tube well, water contribution to bore hole takes place through the bottom layer only. It is similar to the category of deep well of open well type.
C. The surface supplies are generally contaminate and cannot be used without any treatment. • The natural outflows of ground water takes place through springs and river bed, when the ground water pressure is higher than surface water. Sub-surface source of water–Aquifers, artesian well, infiltration well, infiltration gallery etc. Cavity type:- In this type of tube well, water contribution to bore hole takes place through the bottom layer only. It is similar to the category of deep well of open well type.

Explanations:

The surface supplies are generally contaminate and cannot be used without any treatment. • The natural outflows of ground water takes place through springs and river bed, when the ground water pressure is higher than surface water. Sub-surface source of water–Aquifers, artesian well, infiltration well, infiltration gallery etc. Cavity type:- In this type of tube well, water contribution to bore hole takes place through the bottom layer only. It is similar to the category of deep well of open well type.