1. 1. Ground water is a ………… resource of the earth.
(replenishable, scarce, evenly distributed)
2. ………………………. Is the greatest user of ground water
(agriculture, rural water supply, industry)
3. The Prime factors to be considered in any ground water investigation programme are:
(a) Zones of occurrence and recharge.
(b) Opportunity for recharge.
(c) Hydraulic connection between recharge and discharge areas.
(d) Balancing annual extraction and recharge.
(e) Optimum spacing of wells.
(f) All the above factors.
(g) None of these factors.
4. Conjuctive use of ground and surface water helps
(a) Prevent water logging
(b) More area to be irrigated
(c) Supplemental irrigation.
(d) All the above factors
(e) None of these factors
5. Economic use of water can be obtained by
(a) Volumetric sale of water
(b) Charging a crop – wise water rate per hectare of crop
(c) Lining the water courses
(d) Matching the soil-water-plant relationship, the crop pattern and planning.
(e) Landshaping andproviding adequate drainage.
(f) Using imoproved seeds and fertilizers.
(g) All the above answers.
(h) None of these answers.
6. Ground water legislation is needed to
(a) Check indiscriminate draining of ground water
(b) Check pollution of ground water.
(c) Maximise irrigation efficiency
(d) Limit the use of water
(e) All the above answers
(f) None of these answers
7. Infra-red radiations can be utilized for demarcating the areas of:
(a) Surface water and ground water
(b) Underground fresh water and salt water.
8. Porosity is significant in the storage function of rocks while permeability indicates the water
yield property of rocks, hence the yield from wells.
9. Wells are spaced for a part in hard rocks than in alluvial areas.
2. 10. An open well may become dry if a borewell is drilled very close to it and pumped continuously.
11. Favourable sites for well sinking are
(a) Valley region rather than the top of the hillock
(b) Bald hillocks with xerophytes
(c) Thick vegetation
(d) Presence of phreatophytes
(e) Joints and faults in rocks
(f) Presence of dykes
(g) Anticlinal folds
(h) Synclinal folds
(i) Aras below tank bunds
(j) None of the above locations
12. A perchaed water table
(a) May lie below the ground water table.
(b) May lie above the ground water table.
(c) Gives a fair amount of sustained yield.
(d) Is deceptive and the yield from them is short-lived.
13. Artesian conditions may be formed
(a) Due to the presence of a broadly synclinal water bearing formation.
(b) When the well is sunk at the exposed ground surface at the higher level called the recharge
area.
(c) When the well is sunk in the though of the synclinal valley
(d) Usually at the crest of an anticlinal water bearing formation.
(e) At all the above location.
14. A spring may be formed when a sloping permeable bed is
(a) Interrupted by a dyke
(b) Interrupted by an impermeable bed due to the presence of a fault.
(c) Interrupted by the naturally sloping ground surface or hill side.
(d) Always well below ground level with no interruptions.
15. The specific yield of a formation may be more than its porosity
16. Land subsidence may be caused by excessive pumpage of artesian aquifers
17. The transmissibility of a confined aquifer depends upon the depth of the water table while that
of the water table aquifer does not.
18. Flow through a coarse gravelly sand aquifer is entirely laminar
19. Closer the water table contour spacings, higher the gradiengts of subsoil flow and higher the
permeabilities, and hence more gradients are the well sites
20. Storage coefficient is the same as the specific yield for water table aquifer.
21. The annual ground water storage in an area is equal to
(a) Land area X drop in ground water table
(b) Land area X rise in ground water table X porosity of formation
(c) Involved area of aquiferXmaximum seasonal fluctuation in ground water table X specific
yield of aquifer
3. 22. The velocity at which a tracer would more is
(a) The same as the seepage velocity given by Darcy’s law
(b) 1/nth times the seepage velocity, where n is the porosity (fraction) of the function.
23. The seepage (ground water flow) is calculated as
(a) Cross – sectional area of aquifer X slope of ground water table X permeability of the aquifer
(b) Cross – Sectional area of aquifer X slope of ground water table X transmissibility of the
aquifer
(c) Width of aquifer X slope of piezometric surface X transmissibility of aquifer (artesian)
(d) Width of aquifer X slope of ground water table X permeability of aquifer
(e) None of the above methods
24. For laminar flow in a medium sand aquifer, the Reynolds number is
(a) < 200
(b) <1
(c) 1 to 10
(d) <50
25. The storage coefficient of an aquifer is
(a) Attributable to the compressibility of the aquifer skeleton and the pore water
(b) Attributable to the compressibility of the aquifer skeleton and expansibility of the pore
water
(c) Attributable to the expansibility of the aquifer skeleton and the pore water
(d) The volume of water released from a vertical column of aquifer of unit cross-sectional area
due to a unit decline of piezometric head
(e) The volume of water taken into storage in a vertical column of aquifer of unit cross-sectional
area due to a unit increase in piezometric head
26. The volume of water released from storage the entire aquifer due to a unit decline of
piezometric head.
