- (A) increasing the depth of tank
- (B) decreasing the depth of tank
- (C) increasing the surface area of tank
- (D) decreasing the surface area of tank
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- (A) 1 to 2 minutes
- (B) 30 to 45 minutes
- (C) 2 to 6 hours
- (D) 2 to 6 days
- (A) sulphuric acid
- (B) copper sulphate
- (C) lime
- (D) sodium permanganate
- (A) 50 to 60
- (B) 100 to 150
- (C) 500 to 600
- (D) 1400 to 1500
- (A) excessive negative head
- (B) mud ball formation
- (C) higher turbidity in the effluent
- (D) low temperature
- (A) 0.1 ppm
- (B) 0.01 ppm
- (C) 0.001 ppm
- (D) 0.0001 ppm
- (A) 5 litres/sec
- (B) 50 litres/sec
- (C) 500 litres/sec
- (D) 1000 litres/see
- (A) suspended impurities
- (B) dissolved impurities
- (C) both suspended and dissolved impuri¬ties
- (D) none of the above
- (A) hardness in water
- (B) turbidity in water
- (C) dissolved oxygen in water
- (D) residual chlorine in water
- (A) 2
- (B) 5
- (C) 7
- (D) 10
