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
The correct
answer is
- (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
- (A) Low
head scheme
- (B) Medium
head scheme
- (C) High
head scheme
- (D) None
of the above
15. In nature water may occur as
- (A) Liquid
- (B) Solid
- (C) Vapours
- (D) All
the above