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Q: Which of the following is a sub-surface source of water supply?
  • A. Streams
  • B. Tube well
  • C. Reservoir
  • D. Dam
Correct Answer: Option B - Water beneath the land surface occurs in two principle zones, the unsaturated zones and the saturated zone. • In the unsaturated zone, the voids that is, the spaces between grains of gravel, sand, silt, clay and cracks within rocks contain both air and water, these water is sub-surface source of water such as aquifer, artesian well, infiltration well, infiltration gallery, tube well etc.
B. Water beneath the land surface occurs in two principle zones, the unsaturated zones and the saturated zone. • In the unsaturated zone, the voids that is, the spaces between grains of gravel, sand, silt, clay and cracks within rocks contain both air and water, these water is sub-surface source of water such as aquifer, artesian well, infiltration well, infiltration gallery, tube well etc.

Explanations:

Water beneath the land surface occurs in two principle zones, the unsaturated zones and the saturated zone. • In the unsaturated zone, the voids that is, the spaces between grains of gravel, sand, silt, clay and cracks within rocks contain both air and water, these water is sub-surface source of water such as aquifer, artesian well, infiltration well, infiltration gallery, tube well etc.