Multiple Choice Questions on Water Treatment - ObjectiveBooks

Multiple Choice Questions on Water Treatment

Practice Test: Question Set - 23

1. The nitrate concentration in domestic water supplies, is generally limited to
    (A) 10 ppm
    (B) 15 ppm
    (C) 30 ppm
    (D) 45 ppm

2. Carbonates in water produce
    (A) Temporary hardness
    (B) Permanent hardness
    (C) Acidity
    (D) Alkanity

3. Ground water from artesian wells
    (A) Contains no suspended materials
    (B) Contains dissolved salts
    (C) May be saltish and hard
    (D) All the above

4. Alum is a
    (A) Coagulant
    (B) Flocculent
    (C) Catalyst
    (D) Disinfectant

5. Sluice valves are fitted in a distribution system
    (A) Along straight length of pipes at suitable intervals
    (B) At the junctions of the pipes
    (C) At the branching off points of sub-mains
    (D) All the above

6. The ratio of maximum hourly consumption and average hourly consumption of the maximum day, is
    (A) 1.2
    (B) 1.5
    (C) 1.8
    (D) 2.7

7. If the average daily demand of a city of 50,000 population, is 20 m.l.d., the maximum daily demand is
    (A) 24 mld
    (B) 30 mld
    (C) 36 mld
    (D) 54 mld

8. Aqueducts are generally designed
    (A) Circular
    (B) Rectangular
    (C) Horse shoe section
    (D) All the above

9. Water losses in water supply, is assumed as
    (A) 5 %
    (B) 7.5 %
    (C) 10 %
    (D) 15 %

10. The requirement of water per capita per day, is
    (A) 90 liters
    (B) 120 liters
    (C) 250 liters
    (D) 400 liters

11. The maximum permitted loss of head in a rapid sand filter, is
    (A) 1 m
    (B) 2 m
    (C) 3 m
    (D) 4 m

12. Mud balls may be removed by
    (A) Breaking and washing
    (B) Washing the filter with a solution of caustic soda
    (C) Removing, cleaning and replacing the damaged sand
    (D) All the above

13. The lowest outlet sluice in a dam is provided
    (A) Below the dead storage
    (B) On the top level of dead storage
    (C) On the top level of useful storage
    (D) At the centre of the dam

14. The strainer type tube well, is unsuitable for
    (A) Coarse gravels
    (B) Fine sandy strata
    (C) Clean gravels
    (D) None of these

15. Cast iron pipes are generally preferred to, because
    (A) Of moderate cost
    (B) Of ease to join
    (C) Of longer life
    (D) All the above

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