Chemical Engineering - Environmental Engineering

1. 

In water treatment plant, zeolite process is used to remove the __________ of water.

A. acidity
B. alkalinity
C. hardness
D. iron & zinc

Answer: Option C

Explanation:

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2. 

For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than __________ ppm.

A. 10000
B. 5
C. 500
D. 1000

Answer: Option B

Explanation:

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3. 

Fresh sewage is __________ in nature.

A. acidic
B. neutral
C. alkaline
D. highly acidic

Answer: Option C

Explanation:

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4. 

In a sedimentation tank, the detention period for water ranges from __________ hours.

A. 2 to 4
B. 8 to 12
C. 16 to 20
D. 24 to 32

Answer: Option A

Explanation:

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5. 

On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because

A. of clotting of blood.
B. of jamming of respiratory tract.
C. it forms carboxyhaemoglobin by combining with haemoglobin of blood, thereby making it incapable of absorbing oxygen.
D. it forms CO2 by combining with oxygen present in the blood.

Answer: Option C

Explanation:

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