Chemical Engineering - Environmental Engineering

1. 

Pick out the wrong statement pertaining to 'green house' for the plants.

A. 'Green house' (made of glass) allows visible sunlight (i.e., short wavelength solar radiation like ultra-violet rays) to pass through the glass and heat up the soil thereby warming up plants inside it.
B. The emitted longer wavelength radiation (e.g., infrared) is partly reflected and partly absorbed by the glass of the green house.
C. 'Green house effect' in earth's atmosphere is due to increasing CO2 level in atmosphere. where CO2 acts like the glass of 'green house' thereby warming up the earth's surface.
D. 'Green house' is colder than the outside atmosphere.

Answer: Option D

Explanation:

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2. 

In water treatment, alum[Al2(SO4)3] is used for the process of

A. filtration
B. coagulation
C. sedimentation
D. disinfection

Answer: Option B

Explanation:

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3. 

Pick out the one which is not a chemical coagulant.

A. Aluminium sulphate
B. Ferrous sulphate
C. Hydrated lime
D. Chloramine

Answer: Option D

Explanation:

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4. 

Presence of iron and manganese in water causes

A. reduction in its dissolved oxygen content.
B. discoloration of bathroom fixtures.
C. temporary hardness.
D. none of these.

Answer: Option B

Explanation:

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5. 

Septic tanks are used for the __________ of the deposited solids.

A. separation
B. anaerobic decomposition
C. aerobic decomposition
D. none of these

Answer: Option B

Explanation:

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