Water Treatment MCQ – Environmental Engineering

41. With what substance would water be treated to remove algae?

1. alum
2. copper sulphate
3. polyphosphate
4. greensand

42. First stage of water treatment is

1. plain sedimetation
2. coagulation
3. filtration
4. disinfection

43. Which of the following treatments is especially applicable to the removal of tastes resulting from dissolved gases?

1. Lime
2. Activated carbon
3. Fluorine
4. Chloramines

44. Which of the following is NOT an advantage of chloramines-ammonia treatment of water?

1. It is less effective than chlorine alone
2. It prevents bad taste and odour
3. There is no danger of overdose
4. Quantity of chlorine required is reduced especially if organic matter is present in large amounts

45. The suitable layout for a water supply distribution system, for an irregularly grown town, is

1. radial system
2. grid iron system
3. dead-end system
4. ring system

46. The amount of potassium permanganate required for disinfection purpose is

1. 1-2 mg/L
2. 5-7 mg/L
3. 0.1-0.5 mg/L
4. 10-12 mg/L
5. 20-25 mg/L

47. Which one of the following type of treatments will be used for neutralization of alkaline effluent?

1. Lime stone treatment
2. Caustic lime treatment
3. Carbon dioxide treatment
4. Hydrochloric acid treatment

48. By using the lime-soda process of water softening

1. Lime reduces the carbonate hardness while soda reduces the non-carbonate hardness
2. Lime reduces the non-carbonate hardness while soda reduces the carbonate hardness
3. Only carbonate hardness is removed
4. Only non-carbonate hardness is removed

49. As compared to lime soda process, the zeolite process

1. is bulky
2. is costlier
3. leads to large quantity of sludge formation
4. requires careful and skilled supervision

50. To prepare chlorinated cuppers coagulant, the proportion of chlorine : coppers is

1. 1 : 7.8
2. 1 : 9.2
3. 1 : 10.5
4. 1 : 12.5