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Chemical Engineering - Environmental Engineering

Exercise : Environmental Engineering - Section 4
1.
Pick out the wrong statement pertaining to 'green house' for the plants.
'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.
The emitted longer wavelength radiation (e.g., infrared) is partly reflected and partly absorbed by the glass of the green house.
'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.
'Green house' is colder than the outside atmosphere.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
2.
In water treatment, alum[Al2(SO4)3] is used for the process of
filtration
coagulation
sedimentation
disinfection
Answer: Option
Explanation:
No answer description is available. Let's discuss.
3.
Pick out the one which is not a chemical coagulant.
Aluminium sulphate
Ferrous sulphate
Hydrated lime
Chloramine
Answer: Option
Explanation:
No answer description is available. Let's discuss.
4.
Presence of iron and manganese in water causes
reduction in its dissolved oxygen content.
discoloration of bathroom fixtures.
temporary hardness.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
5.
Septic tanks are used for the __________ of the deposited solids.
separation
anaerobic decomposition
aerobic decomposition
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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