- (A) carbon dioxide
- (B) oxygen
- (C) hydrogen
- (D) nitrogen
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- (A) 10 to 15
- (B) 20 to 25
- (C) 30 to 35
- (D) 40 to 50
- (A) applied chlorine
- (B) residual chlorine
- (C) sum of applied and residual chlorine
- (D) difference of applied and residual chlorine
- (A) less than that of slow sand filters
- (B) in between the filtration rate of slow sand filters and rapid sand filters
- (C) greater than that of rapid sand filters
- (D) equal to that of slow sand filters
- (A) 0.2 to 0.4
- (B) 0.4 to 1.0
- (C) 2 to 4
- (D) 5 to 7
- (A) Both A and R are true and R is the correct explanation of A
- (B) Both A and R are true but R is not the correct explanation of A
- (C) A is true but R is false
- (D) A is false but R is true
- (A) 0.25 to 0.35 mm
- (B) 0.35 to 0.60 mm
- (C) 0.60 to 1.00 mm
- (D) 1.00 to 1.80 mm
- (A) dissolved organic substances
- (B) dissolved solids and dissolved gases
- (C) floating solids and dissolved inorganic solids
- (D) bacteria and colloidal solids
- (A) does not require alkalinity in water for flocculation
- (B) does not affect pH value of water
- (C) increases pH value of water
- (D) decreases pH value of water
- (A) 2 to 4
- (B) 4 to 6
- (C) 6 to 8
- (D) 8 to 10
