Chemical Engineering - Environmental Engineering

1. 

The term Biological Oxygen Demand (BOD) is used in relation to

A. potable water
B. cooling water
C. distilled water
D. industrial effluents

Answer: Option D

Explanation:

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2. 

The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant ?

A. Chlorine
B. Alkalis
C. Benzene hexachloride
D. Alkyl benzene sulphonate (ABS)

Answer: Option A

Explanation:

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3. 

Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of

A. ozone and iodine.
B. chlorine or its compounds.
C. ultraviolet light for irradiation of water.
D. all (a), (b) & (c).

Answer: Option D

Explanation:

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4. 

Which of the following processes is involved in the biochemical treatment of sewage effluents ?

A. Oxidation
B. Reduction
C. Dehydration
D. Fermentation

Answer: Option A

Explanation:

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5. 

Infective bacteria in water is killed by the __________ process.

A. sterilisation
B. aeration
C. disinfection
D. none of these

Answer: Option A

Explanation:

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