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Environmental Engineering in CE

Environmental Engineering in CE
Septic tank is a(i) Settling tank(ii) Digestion tank(iii) Aeration tank

(i) and (ii)
(i) and (iii)
Only (i)
Only (iii)

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Environmental Engineering in CE
Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gas-air mixture), rendering it the property of the most explosive gas?

Carbon monoxide
Ammonia
Hydrogen
Acetylene

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Environmental Engineering in CE
Presence of excess flourine in water causes

Tooth decay
Dental cavity
Fluorosis
Respiratory disease

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Environmental Engineering in CE
Shouting by a man at his full voice corresponds to a voice level of about __________ decibels.

25
50
120
80

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Environmental Engineering in CE
TLV of aldrin in public water supply system is about __________ μg/litre.

17
0.5
357
1097

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Environmental Engineering in CE
Inhalation of lead compounds present in automobile exhaust (using leaded petrol) causes

Blood poisoning
Anaemia
All of these
Nervous system disorder

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