Civil Engineering - Water Supply Engineering

6. 

The transitional middle portion of a logistic curve follows

A. a geometric growth
B. a logarithmic growth
C. a first over curve
D. a constant rate.

Answer: Option D

Explanation:

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7. 

Pick up the correct statement from the following :

A. Excess quantities of iron and manganese in water, cause discolouration of clothes
B. Lead and barium salts have toxic effect
C. Arsenic and selenium are poisonous to human health
D. Higher copper content affects the lungs
E. All the above.

Answer: Option E

Explanation:

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8. 

Pick up the incorrect statement from the following regarding fire hydrants

A. Fire hydrants are fitted in water mains at 100 m to 150 m apart at fire
B. The minimum water pressure hydrants, is kept 1.5 kg/cm2
C. The water at pressure 1 to 1.5 kg/cm2 is made available for 4 to 5 hours for constant use
D. None of these.

Answer: Option D

Explanation:

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9. 

The specific retention is least in case of

A. Clay
B. Sand
C. Silt
D. Coarse gravel.

Answer: Option D

Explanation:

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10. 

B.O.D. of treated water should be

A. 10 ppm
B. 25 ppm
C. 20 ppm
D. 30 ppm
E. Nil.

Answer: Option E

Explanation:

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