Civil Engineering - Water Supply Engineering

41. 

The bacterias which require free oxygen for their survival, are called

A. Aerobic bacterias
B. Anaerobic bacterias
C. Faculative bacteria
D. None of these.

Answer: Option A

Explanation:

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42. 

Maximum threshold number permitted for indicating the odour of public water supplies, is

A. 1
B. 2
C. 3
D. 4
E. 5

Answer: Option C

Explanation:

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43. 

45 litres of water per person per day, is provided in

A. office buildings
B. hotels
C. hostels
D. nurse's homes.

Answer: Option A

Explanation:

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44. 

Turbidity of water may be caused due to

A. Suspended clay
B. Suspended silt
C. finely divided organic material
D. all the above.

Answer: Option D

Explanation:

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45. 

Pick up the correct statement from the following :

A. Water with hardness upto 75 ppm is considered soft
B. Water with hardness more than 200 ppm is considered hard
C. Water needed for laundaries should contain hardness less than 75 ppm
D. To provide taste during drinking, water should possess hardness between 75 to 120
E. All the above.

Answer: Option E

Explanation:

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