Environmental Engineering - Civil Engineering - Civil Engineering Questions and Answers

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The percentage of chlorine in fresh bleaching powder is about

10 to 15

20 to 25

30 to 35

40 to 50

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For a country like India, where rainfall is mainly confined to one season, the suitable sewerage system will be

Separate system

Combined system

Partially combined system

Partially separate system

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Dissolved oxygen in streams is

Maximum at noon

Minimum at noon

Maximum at midnight

Same throughout the day

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If the time of concentration is 9 minutes, then the intensity of rainfall according to British Ministry of Health formula will be

4 mm/hr

10 mm/hr

20 mm/hr

40 mm/hr

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For normal sludge, the value of sludge index for Indian conditions is

0 to 50

50 to 150

150 to 350

350 to 500

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The most common cause of acidity in water is

Carbon dioxide

Oxygen

Hydrogen

Nitrogen

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The length of rectangular sedimentation tank should not be more than
(Where ‘B’ is the width of the tank)

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Septic tank is a
(i) Settling tank
(ii) Digestion tank
(iii) Aeration tank

Only (i)

(i) and (ii)

(i) and (iii)

Only (iii)

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Double filtration is used

To increase the filtration slow sand filters capacity of

To increase the filtration rapid sand filters capacity of

For isolated buildings like pools, hotels etc swimming

All of the above