Water Resources Engineering MCQ Test - Set 09 - ObjectiveBooks

# Practice Test: Question Set - 09

1. Unit Hydrograph theory was enunciated by
(A) Merril Bernard
(B) W.W. Horner
(C) Le-Roy K. Shermen
(D) Robert E. Horten

2. The ratio of rate of change of the discharge of an outlet to the rate of change of the discharge of distributing channel is called
(A) Proportionality
(B) Flexibility
(C) Setting
(D) Sensitivity

3. Pick up the correct equation from the following:
(A) Run off = Surface run off + Ground water flow
(B) Run off = Surface run off - Ground water flow
(C) Run off = Surface run off / Ground water flow
(D) Run off = Surface run off × Ground water flow

4. A repelling groyne is aligned
(A) Pointing upstream
(B) Pointing downstream
(C) Perpendicular to bank
(D) Parallel to bank

5. Precipitation caused by lifting of an air mass due to the pressure difference, is called
(A) Cyclonic precipitation
(B) Convective precipitation
(C) Orographic precipitation
(D) None of these

6. A 6 hours storm had 4 cm of rainfall and the resulting runoff was 2 cm. If <j) index remains at the same value, the runoff due to 10 cm rainfall in 12 hours in the catchment is
(A) 4.5 cm
(B) 6.0 cm
(C) 7.5 cm
(D) 9.0 cm

7. The deficiency in rain catch due to vertical acceleration of air forced upward over the gauge, is
(A) Greater for heavy rain
(B) Greater for lighter rain
(C) Greater for large drops
(D) Lesser for small rain drops

8. Presence of tail water in a gravity dam
(i) Increases the principal stress
(ii) Decreases the principal stress
(iii) Increases the shear stress
(iv) Decreases the shear stress
(A) (i) and (iii)
(B) (i) and (iv)
(C) (ii) and (iii)
(D) (ii) and (iv)

9. If y is the depth of water at any section, then the mean velocity is
(A) 0.1 y
(B) 0.2 y
(C) 0.3 y
(D) 0.6 y

10. As compared to crest of the normal portion of the weir, the crest of the under sluice portion of weir is kept at
(A) Lower level
(B) Higher level
(C) Same level
(D) Any of the above depending on the design

11. If S is the potential infiltration, P is rainfall in cm in a drainage of a soil with fair pasture cover, the direct run off Q in cm is given by
(A) Q = (P - 0.1 S)2/(P + 0.4 S)
(B) Q = (P - 0.2 S) 2/(P + 0.6 S)
(C) Q = (P - 0.2 S) 2/(P + 0.8 S)
(D) Q = (P - 0.2 S) 2/(P + 0.2 S)

12. In a Sarda type fall, rectangular crest is used for discharge upto
(A) 6 cumecs
(B) 10 cumecs
(C) 14 cumecs
(D) 20 cumecs

13. A well penetrates to 30 m below the static water table. After 24 hours of pumping at 31.40 litres/minute, the water level in a test well at a distance of 80 m is lowered by 0.5 m and in a well 20 m away water is lowered by 1.0 m. The transmissibility of the aquifer, is
(A) 1.185 m2/minute
(B) 1.285 m2/minute
(C) 1.385 m2/minute
(D) 1.485 m2/minute

14. A hydroelectric scheme operating under a head of 80 m will be classified as