Water Treatment MCQ – Environmental Engineering

61. Compared to Lime soda process, Zeolite process has advantages in terms of the following, except

1. Better removal of hardness
2. Plant is compact and small
3. Skilled supervision is not required
4. Economy

62. Chlorides are normaly present in water in the form of

1. Zinc chloride
2. Ferric chloride
3. Mercuric chloride
4. Sodium chloride

63. What is the equivalent calcium carbonate concentration of 110 mg/L of CaCl₂?

1. 58.5 mg/L
2. 50 mg/L
3. 117 mg/L
4. 100 mg/L

64. Which one of the following is used to kill the pathogens?

1. Oxidation
2. Chlorination
3. Nitrification
4. Ozone

65. To make potable water by killing harmful pathogens present in water is termed as

1. Purification
2. Disinfection
3. Sterilization
4. Chlorination

66. Lime-soda process is adopted to remove from water

1. temporary hardness
2. odour and taste
3. permanent hardness
4. lead

67. Normal dosage of chlorine in public water supply scheme is

1. 0.5 to 1.0 mg/L
2. 1.5 to 2.5 mg/L
3. 0.2 to 0.5 mg/L
4. 0.05 to 0.2 mg/L

68. Objectionable tastes and odours can be removed from water by

1. aeration
2. coagulation
3. application of activated carbon
4. any of the above

69. Which of the following can be used disinfection of swimming pools?

1. chlorine
2. bromine
3. ultraviolet rays
4. any of these