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Environmental Engineering in CE

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?

Hydrogen
Carbon monoxide
Acetylene
Ammonia

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Environmental Engineering in CE
The widest explosive limit is of __________ , thereby making it the most explosive gas.

Hydrogen
Acetylene
Carbon monoxide
Petrol vapor

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Environmental Engineering in CE
Turbidity of water is an indication of the presence of

Dissolved gases
Dissolved solids
Floating solids
Suspended inorganic matter

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Environmental Engineering in CE
Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about __________ decibels.

75
120
95
140

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Environmental Engineering in CE
Infective bacteria in water is killed by the __________ process.

Sterilisation
Disinfection
None of these
Aeration

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Environmental Engineering in CE
Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur?

Thermosphere
Stratosphere
Troposphere
None of these

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