Civil Engineering MCQs

A. Sodium sulphate
B. Copper sulphate
C. Sodium chloride
D. Calcium chloride

A. Only carbonate hardness is removed
B. Only non-carbonate hardness is re-moved
C. Lime reduces the carbonate hardness and soda-ash removes the non-carbo¬nate hardness
D. Lime reduces the non-carbonate hard-ness and soda-ash removes the carbo¬nate hardness

A. Smaller
B. Larger
C. Same
D. None of the above

A. Carbon dioxide
B. Bleaching powder
C. Sulphur dioxide
D. Chloramines

A. Prechlorination
B. Super chlorination
C. Dechlorination
D. Hypochlorination

A. Prechlorination
B. Post chlorination
C. Super chlorination
D. Break point chlorination

A. 1) decreasing the time of contact
B. 2) decreasing the temperature of water
C. 3) increasing the temperature of water
D. The correct answer is ?

A. To increase the filtration slow sand filters capacity of
B. To increase the filtration rapid sand filters capacity of
C. For isolated buildings like pools, hotels etc swimming
D. All of the above

A. Removal of turbidity
B. Removal of hardness
C. Killing of disease bacteria
D. Complete sterilisation

A. 24 – 48 hours
B. 10-12 days
C. 2-3 months
D. 1-2 year