Chemical Engineering - Environmental Engineering

1. 

Presence of non-biodegradable substances, like alkyl benzene sulphonate (ABS) from the detergents in polluted water stream causes

A. fire hazards.
B. explosion hazards.
C. persistent foam.
D. depletion of dissolved oxygen.

Answer: Option C

Explanation:

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2. 

Pick out the wrong statement.

A. The concentric layer in atmosphere which contains about 70% of the total mass of atmosphere and characterised by a steady decrease in temperature is called stratosphere.
B. Stratosphere is rich in ozone and is located just above the troposphere.
C. Troposphere is a turbulent dusty zone containing much of water vapor and clouds.
D. The earth's atmosphere is an envelope of gases extending upto a height of about 200 kms.

Answer: Option A

Explanation:

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3. 

Radioactive solid nuclear wastes are disposed off by

A. high temperature incineration.
B. pathological incineration.
C. pyrolysis.
D. underground burial in concrete containers.

Answer: Option D

Explanation:

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4. 

Growth of __________ is promoted by the presence of manganese in water.

A. files
B. algae
C. micro-organisms
D. mosquitoes

Answer: Option C

Explanation:

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5. 

Average human body contains about __________ percent water by weight.

A. 20
B. 40
C. 70
D. 85

Answer: Option C

Explanation:

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