Water Supply Public Health Engineering Objective Questions - Set 18 - ObjectiveBooks

Water Supply Public Health Engineering Objective Questions - Set 18

Practice Test: Question Set - 18

1. Capacity of soil to absorb moisture, is generally known as
    (A) Permeability
    (B) Porosity
    (C) Infiltration capacity
    (D) Perviousness

2. Average annual rainfall at any station is the average of annual rainfall over a period of
    (A) 7 years
    (B) 14 years
    (C) 28 years
    (D) 35 years

3. If Q is discharge is cubic meters per sec and D is the economical diameter of the pipe. According to Lea
    (A) D = 0.67 to 0.87 √Q
    (B) D = 0.77 to 0.97 √Q
    (C) D = 0.97 to 1.22 √Q
    (D) D = 1.22 to 1.33 √Q

4. The flow of water gets retarded, in
    (A) Settling tank
    (B) Sedimentation tank
    (C) Clarifier
    (D) All the above

5. At the socket and spigot joint,
    (A) Enlarged end of the pipe is called socket
    (B) Normal end of the pipe is called spigot
    (C) Spigot is fitted into the socket
    (D) All the above

6. Yield of a drainage basin is:
    (A) Run off of the area expressed as instantaneous rate
    (B) Average run off over a short period
    (C) Total volume of water flowing annually
    (D) All the above

7. Disappearance of pink color of water of a well due of KMnO4 indicates that water contains
    (A) Acidity
    (B) Alkalinity
    (C) Turbidity
    (D) Organic matter

8. The specific retention is least in case of
    (A) Clay
    (B) Sand
    (C) Silt
    (D) Coarse gravel

9. If w is the weight of water per cubic metre, Q is the discharge in cubic meters per sec and H is the total head, the required water horse power of the pump, is
    (A) wQH/15
    (B) wQH/360
    (C) wQH/220
    (D) wQH/550

10. Pipes are laid parallel
    (A) To increase the capacity of the water supply
    (B) To provide a means of repairing without closing water supply
    (C) To meet the requirement of excessive supply
    (D) All the above

11. The factor affecting per capita demand, is
    (A) Size of the city
    (B) Climatic conditions
    (C) Pressure in water mains
    (D) All the above

12. Filtration of water is done to remove
    (A) Color
    (B) Odour
    (C) Turbidity
    (D) Pathogenic bacteria

13. An ideal sand for filters should be
    (A) Free from dirt and other impurities
    (B) Uniform in nature and size
    (C) Hard and resistant
    (D) All the above

14. Hardness of water is caused due to
    (A) Calcium sulphate
    (B) Magnesium sulphate
    (C) Calcium nitrates
    (D) All the above

15. Normal values of overflow rate for sedimentation tanks using coagulants in litres/hr/m2, generally range between
    (A) 250 to 500
    (B) 500 to 750
    (C) 750 to 1000
    (D) 1000 to 1250

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