Environmental Engineering - Interview Questions | Exam2Win

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61. Which of the following is not a water borne disease ?

A. dysentery

B. cholera

C. typhoid

D. maleria

Explanation:

62. Alum as a coagulant is found to be most effective when pH range of water is

A. 2 to 4

B. 4 to 6

C. 6 to 8

D. 8 to 10

Explanation:

63. The detention period in coagulation tanks is usually kept as

A. 1 to 2 minutes

B. 30 to 45 minutes

C. 2 to 6 hours

D. 2 to 6 days

Explanation:

64. Air binding phenomena in rapid sand filters occur due to

A. excessive negative head

B. mud ball formation

C. higher turbidity in the effluent

D. low temperature

Explanation:

65. The chemical most commonly used to increase speed of sedimentation of sewage is

A. sulphuric acid

B. copper sulphate

C. lime

D. sodium permanganate

Explanation: