### Civil Engineering - Water Supply Engineering MCQs Part 8

1. Capacity of soil to absorb moisture, is generally known as

A.
permeability
B.
porosity
C.
infiltration capacity
D.
perviousness.

2. At break point of chlorination,

A.
chlorine is used to oxidise
B.
residual chloride is zero
C.
residual chloride is maximum
D.
residual chlorine reappears.

3. The difference in the reservoir level and the lowest point of the water mains is 180 m. The expected pressure due to water hammer is 7.5 kg/cm2 in a pressure conduit of diameter 1 m. Assuming the efficiency of the riveted joints of the pipe as 0.6 and minimum cover 3 mm for corrosion, the thickness of the pipe materials, is

A.
10 mm
B.
15 mm
C.
20 mm
D.
25 mm
E.
30 mm.

4. The factor for the selection of pumping station site, is

A.
distance of the source of contamination or pollution
B.
height above the H.F.L. of the river
C.
future expansion
D.
proximity of the site from the railway station
E.
all the above.

5. Low turbidity of water is detected by

A.
Turbidity tube
B.
Jackson turbidity meter
C.
Baylis turbidimeter
D.
Hellipe turbidimeter
E.
None of these.

6. Pick up the incorrect statement from the following :

A. The pH value of water indicates the logarithm of reciprocal of hydrogen ion concentration in water
B. Higher value of pH means lower hydrogen ion concentration
C. Lower value of pH means higher hydrogen ion contraction
D. Lower value of pH gives alkaline solution
E. None of these.

7. Pick up the correct statement from the following :

A. The volume of underground water extracted by gravity drainage from a saturated soil, is known as yield
B. The ratio of volume drained to the total volume of material drained, is known as specific yield
C. The volume of water retained by the soil against the pull of gravity, is called specific retention or field capacity
D. The sum of specific yield and specific retention, is equal to porosity
E. All the above.

8. Perched acquifers generally occur

A. below water table
B. above water table
C. in acquicludes
D. in artesian acquifers
E. none of these.

9. Silt storage is the same as

B. live storage
C. effective storage
D. none of these.

10. For complete stabilisation of organic matter in polluted water, it takes

A. 5 days
B. 10 days
C. 20 days
D. 30 days
E. 40 days.

11. A pressure conduit carrying water beneath a stream or a canal, is known as

A. sag
B. depressed pipe
C. inverted syphon
D. all the above.

12. Suction lift of a pump depends upon

A. atmospheric pressure
B. water temperature
C. velocity of water in suction pipe
D. frictional losses
E. all the above.

13. For 3.25 x 10-2 cumecs discharging from a well, a pump is installed to lift water against a total head of 30 m. The minimum required horse power, is

A. 10 H.P.
B. 15 H.P.
C. 18 H.P.
D. 20 H.P.
E. 25 H.P.

6. Pick up the incorrect statement from the following :

A. The pH value of water indicates the logarithm of reciprocal of hydrogen ion concentration in water
B. Higher value of pH means lower hydrogen ion concentration
C. Lower value of pH means higher hydrogen ion contraction
D. Lower value of pH gives alkaline solution
E. None of these.

7. Pick up the correct statement from the following :

A. The volume of underground water extracted by gravity drainage from a saturated soil, is known as yield
B. The ratio of volume drained to the total volume of material drained, is known as specific yield
C. The volume of water retained by the soil against the pull of gravity, is called specific retention or field capacity
D. The sum of specific yield and specific retention, is equal to porosity
E. All the above.

8. Perched acquifers generally occur

A. below water table
B. above water table
C. in acquicludes
D. in artesian acquifers
E. none of these.

9. Silt storage is the same as

B. live storage
C. effective storage
D. none of these.

10. For complete stabilisation of organic matter in polluted water, it takes

A. 5 days
B. 10 days
C. 20 days
D. 30 days
E. 40 days.