E. Coli bacterias die in water having pH greater than 5.5 6.5 7.5 8.5

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Question
E. Coli bacterias die in water having pH greater than
Options
A. 5.5
B. 6.5
C. 7.5
D. 8.5
E. 9.5

Correct Answer

9.5

Water Supply Engineering problems

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2. A pressure conduit laid under ground, may not be subjected to
Options
A. internal pressure of water
B. pressure due to external load
C. longitudinal temperature stress
D. longitudinal stresses due to unbalanced pressure to bends
E. none of these.

3. The equation in which Q is yearly run off in cm, P is yearly total rainfall in cm, H is difference of R.L.s. of lowest and highest points and A is area of catchment in square metres, is known as
Options
A. English formula
B. Khosla's formula
C. Justin's formula
D. Vermule's formula.

4. The main draw-back of centrifugal pump, is
Options
A. necessity of priming
B. discharge from pump varies with the load of water
C. for high heads, efficiency is low up to 50%
D. the suction lift is limited to 6 m
E. all the above.

5. Disinfection of water with ozone is not good because
Options
A. it vanishes before water reaches the consumers
B. it removes the colour, taste and odour from water as bacterias
C. it adds taste to the water
D. it is more efficient than chlorine in killing bacterias
E. none of these.

9. Pick up the incorrect statement from the following :
Options
A. An impervious layer a few metres below the water table in the sub-soil, is generally called Mota layer (6) Mota layer is very useful to give structural support to open deep wells
B. A bore hole is generally provided in the mota layer for deep wells
C. Shallow wells are always of less depth as compared to deep wells
D. None of these.

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