Environmental Engineering

A. less and more
B. less and less
C. more and less
D. more and more

A. particle size is decreased
B. the surface area of tank is increased
C. the depth of tank is decreased
D. none of the above

A. 10 to 25
B. 50
C. 75
D. 100

A. B
B. 2B
C. 4B
D. 8B

where B is the width of the tank

A. 1 mg/litre
B. 10 mg/litre
C. 100 mg/litre
D. 1000 mg/litre

A. total alkalinity
B. total hardness
C. total hardness – total alkalinity
D. non carbonate hardness

A. starch iodide method
B. orthotolidine method
C. both (A) and (B)
D. none of the above

A. standard silica scale
B. standard cobalt scale
C. standard platinum scale
D. platinum cobalt scale

A. 0.1 mg/litre
B. 1.5 mg/litre
C. 5 mg/litre
D. 10 mg/litre

A. calcium carbonate
B. magnesium carbonate
C. sodium carbonate
D. calcium hydroxide