1. : The study of groundwater flow towards wells is called:
(A) Hydrogeology
(B) Well hydraulics
(C) Irrigation engineering
(D) Soil physics
2. : The equation for steady radial flow in a confined aquifer is given by:
(A) Darcy–Weisbach equation
(B) Thiem’s equation
(C) Dupuit’s equation
(D) Manning’s equation
3. : The governing equation for steady radial flow in an unconfined aquifer is:
(A) Thiem’s equation (unconfined form)
(B) Bernoulli’s equation
(C) Hooghoudt’s equation
(D) Hazen–Williams equation
4. : In Dupuit’s assumption, it is considered that:
(A) Flow lines are vertical
(B) Flow lines are horizontal and velocity is proportional to slope of water table
(C) Flow is turbulent
(D) Head loss is negligible
5. : The drawdown in a pumping well is defined as:
(A) Difference between static water level and pumping water level
(B) Depth of aquifer
(C) Radius of influence
(D) Cone of depression radius
6. : The region around a pumping well affected by lowering of water table is called:
(A) Recharge basin
(B) Cone of depression
(C) Piezometric surface
(D) Perched zone
7. : The discharge of a confined aquifer well is directly proportional to:
(A) Transmissibility
(B) Logarithm of radius of influence
(C) Difference in piezometric heads
(D) All of the above
8. : A well fully penetrating a confined aquifer gives:
(A) Maximum discharge
(B) Minimum discharge
(C) No discharge
(D) Same discharge as partially penetrating well
9. : The transmissivity of an aquifer is given by:
(A) K × b
(B) K / b
(C) K × i
(D) b / K
10. : The storage coefficient of a confined aquifer is typically in the range:
(A) 0.1 – 0.3
(B) 10⁻³ – 10⁻⁵
(C) 0.5 – 0.8
(D) 0.05 – 0.1
11. : The safe yield of a well means:
(A) Maximum water extraction without causing long-term decline
(B) Maximum pump capacity
(C) Total storage of aquifer
(D) Daily requirement of crops
12. : In a pumping test, the radius of influence increases with:
(A) Increase in pumping rate
(B) Higher transmissibility of aquifer
(C) Longer pumping duration
(D) All of the above
13. : The specific capacity of a well is defined as:
(A) Discharge per unit drawdown
(B) Discharge per unit head
(C) Head loss per unit discharge
(D) Storage per unit decline
14. : A partially penetrating well in an aquifer causes:
(A) More drawdown for same discharge compared to full penetration
(B) Less drawdown for same discharge
(C) Equal drawdown as fully penetrating well
(D) No drawdown
15. : The unsteady radial flow equation in confined aquifers is given by:
(A) Thiem’s equation
(B) Theis’ equation
(C) Dupuit’s equation
(D) Bernoulli’s equation
16. : The Jacob straight-line method is used for:
(A) Estimating transmissibility and storage coefficient from pumping test data
(B) Calculating drawdown in an unconfined aquifer
(C) Designing canals
(D) Measuring soil porosity
17. : A tubewell that taps both confined and unconfined aquifers is called:
(A) Gravity well
(B) Strainer well
(C) Collector well
(D) Combination well
18. : The efficiency of a well is defined as ratio of:
(A) Theoretical drawdown to actual drawdown
(B) Actual drawdown to theoretical drawdown
(C) Specific yield to porosity
(D) Storage to transmissibility
19. : Well losses are mainly due to:
(A) Entrance resistance and turbulence
(B) Friction in aquifer pores
(C) Pump efficiency
(D) Soil porosity only
20. : The discharge from a well is maximum when located at:
(A) Center of aquifer
(B) Upstream side of recharge boundary
(C) Near a recharge boundary (river or canal)
(D) Near an impermeable boundary
21. : The critical velocity in well hydraulics is:
(A) Velocity at which laminar flow changes to turbulent in porous medium
(B) Maximum velocity at pump impeller
(C) Seepage velocity through aquifer
(D) Velocity in confined aquifer only
22. : Step-drawdown tests are conducted to evaluate:
(A) Aquifer properties and well losses separately
(B) Only transmissibility
(C) Safe yield of aquifer
(D) Soil permeability
23. : The cone of depression becomes wider if:
(A) Pumping rate is high and aquifer is less permeable
(B) Pumping rate is low
(C) Aquifer transmissibility is very high
(D) Aquifer is artesian
24. : The storage coefficient of an unconfined aquifer is approximately equal to:
(A) Specific retention
(B) Specific yield
(C) Porosity
(D) Transmissibility
25. : The main disadvantage of over-pumping wells in coastal aquifers is:
(A) Waterlogging
(B) Saltwater intrusion
(C) Improved recharge
(D) Cone of depression reduction