Civil Engineering MCQs

A. 1) scraping and removal in filters slow sand
B. 2) back washing in slow sand filters
C. 3) scraping and removal in filters rapid sand
D. 4) back washing in rapid sand filters

A. Excessive negative head
B. Mud ball formation
C. Higher turbidity in the effluent
D. Low temperature

A. 1) slower filtration rate
B. 2) higher filtration rate
C. 3) lesser efficiency in removal of bacteria
D. 4) higher efficiency in removal of bacteria

A. 50 to 60
B. 100 to 150
C. 500 to 600
D. 1400 to 1500

A. Sulphuric acid
B. Copper sulphate
C. Lime
D. Sodium permanganate

A. 1 to 2 minutes
B. 30 to 45 minutes
C. 2 to 6 hours
D. 2 to 6 days

A. 1) increase in turbidity of water
B. 2) decrease in turbidity of water
C. 3) increase in temperature of water
D. 4) decrease in temperature of water

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

A. Depth of tank
B. Surface area of tank
C. Both depth and surface area of tank
D. None of the above

A. 500 to 750 litres/hour/ m2
B. 1000 to 1250 litres/hour/ m2
C. 1250 to 1500 litres/hour/m2
D. 1500 to 2000 litres/hour/m2