Pick up the correct statement from the following : Due to boiling, the bacterias

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Question
Pick up the correct statement from the following :
Options
A. Due to boiling, the bacterias present in water can be destroyed
B. Lime may be used for softening hard water
C. Excess lime when added to water, raises the pH value of water
D. the bacterias do not survive in water having pH value exceeding 9.5
E. All the above.

Correct Answer

All the above.

Water Supply Engineering problems

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5. Pick up the correct statement from the following :
Options
A. The ratio of the total sediment deposited in the reservoir to the total sediment flowing in the river, is called trap efficiency
B. The ratio of the reservoir capacity to the total inflow of water in it, is generally called capacity inflow ratio
C. Small capacity reservoirs on large rivers generally, silt less
D. Large capacity reservoirs on small rivers generally silt more
E. All the above.

9. Rapid sand filter
Options
A. should be preceeded by coagulation and sedimentation
B. uses rapid sand as filter media
C. is used after slow sand filtering has been done
D. can combine disinfection also.

10. Pick up the correct statement from the following :
Options
A. Copper pipes are highly resistant to acidic and alkaline water
B. Wrought iron pipes are lighter than cast iron pipes
C. Wrought iron pipes corrode quickly and are less durable
D. Wrought iron pipes coated with zinc, are called galvanised iron pipes
E. All the above.

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