1 >>Chlorine demand of water is equal to ?
- (A) applied chlorine
- (B) residual chlorine
- (C) sum of applied and residual chlorine
- (D) difference of applied and residual chlorine
2 >>The process in which the chlorination is done beyond the break point is known as ?
- (A) prechlorination
- (B) post chlorination
- (C) super chlorination
- (D) break point chlorination
3 >>The percentage of chlorine in fresh bleaching powder is about ?
- (A) 10 to 15
- (B) 20 to 25
- (C) 30 to 35
- (D) 40 to 50
4 >>The treatment of water with bleaching powder is known as ?
- (A) prechlorination
- (B) super chlorination
- (C) dechlorination
- (D) hypochlorination
5 >>The suitable method for disinfection of swimming pool water is ?
- (A) ultra violet rays treatment
- (B) lime treatment
- (C) by using potassium permanganate
- (D) chlorination
6 >>Which of the following chemical compounds can be used for dechlorination of water ? ?
- (A) carbon dioxide
- (B) bleaching powder
- (C) sulphur dioxide
- (D) chloramines
7 >>In chlorination, with the rise in temperature of water, death rate of bacteria ?
- (A) increases
- (B) decreases
- (C) remains unaffected
- (D) none of the above
8 >>As compared to higher pH values, the contact period required for efficient chlorination at lower pH values is ?
- (A) smaller
- (B) larger
- (C) same
- (D) none of the above
9 >>Disinfection efficiency is ?
- (A) reduced at higher pH value of water
- (B) unaffected by pH value of water
- (C) increased at higher pH value of water
- (D) highest at pH value equal to 7
10 >>In limesoda process ?
- (A) only carbonate hardness is removed
- (B) only noncarbonated hardness is removed
- (C) lime reduces the carbonate hardness and sodaash removes the noncarbo �nate hardness
- (D) lime reduces the noncarbonated hardness and sodaash removes the carbo�nate hardness
11 >>Which of the following compounds is widely used for algae control ? ?
- (A) sodium sulphate
- (B) copper sulphate
- (C) sodium chloride
- (D) calcium chloride3
12 >>Activated carbon is used for ?
- (A) disinfection
- (B) removing hardness
- (C) removing odours
- (D) removing corrosiveness
13 >>As compared to cast iron pipes, steel pipes are ?
- (A) heavier
- (B) stronger
- (C) costlier
- (D) less susceptible to corrosion
14 >>The suitable layout of a distribution system for irregularly growing town is ?
- (A) dead end system
- (B) grid iron system
- (C) radial system
- (D) ring system
15 >>The layout of distribution system in which water flows towards the outer periphery is ?
- (A) ring system
- (B) dead end system
- (C) radial system
- (D) grid iron system
16 >>The suitable layout of distribution system for a city with roads of rectangular pattern is ?
- (A) grid iron system
- (B) dead end system
- (C) ring system
- (D) radial system
17 >>The commonly used material for water supply pipes, which has the properties of being strong, not easily corroded and long life but is heavy and brittle is ?
- (A) steel
- (B) cast iron
- (C) copper
- (D) reinforced cement concrete
18 >>The method of analysis of distribution system in which the domestic supply is neglected and fire demand is considered is ?
- (A) circle method
- (B) equivalent pipe method
- (C) electrical analysis method
- (D) Hardy cross method
19 >>Which of the following methods of analysis of water distribution system is most suitable for long and narrow pipe system ? ?
- (A) circle method
- (B) equivalent pipe method
- (C) Hardy cross method
- (D) electrical analysis method
20 >>The type of valve which is provided to control the flow of water in the distribution system at street corners and where the pipe lines intersect is ?
- (A) check valve
- (B) sluice valve
- (C) safety valve
- (D) scour valve
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