Environmental Engineering

Question: Insufficient washing of sand grains in a rapid sand filter causes
[A].

air binding

[B].

shrinkage of filtering media

[C].

mud balls

[D].

expansion of filtering media

Answer: Option C

Explanation:

No answer description available for this question.

Question: Brown spots in fabrics will be caused by washing with water containing large amount of .
[A].

iron

[B].

zinc

[C].

iodine

[D].

bromine

Answer: Option A

Explanation:

No answer description available for this question.

Question: Fresh domestic sewage is __________ in color.
[A].

grey

[B].

dark brown

[C].

red

[D].

black

Answer: Option A

Explanation:

No answer description available for this question.

Question: Maximum permissible residual chlorine in treated water should be __________ mg/litre.
[A].

0.001 to 0.01

[B].

02 to 0.3

[C].

2 to 3

[D].

5 to 10

Answer: Option B

Explanation:

No answer description available for this question.

Question: __________ is removed from water by lime-soda process.
[A].

Foul smell and taste

[B].

Iron and manganese

[C].

Temporary hardness

[D].

Permanent hardness

Answer: Option C

Explanation:

No answer description available for this question.

Question: 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:

No answer description available for this question.

Question: Foul odour and bad taste of water is removed by treating with
[A].

alum

[B].

bleaching powder

[C].

activated carbon

[D].

copper sulphate.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Algae growth in water is controlled by
[A].

deoxidation

[B].

chlorination

[C].

bleaching

[D].

aeration

Answer: Option B

Explanation:

No answer description available for this question.

Question: Disinfection of water is done to remove
[A].

color

[B].

bad taste

[C].

foul odour

[D].

bacteria

Answer: Option D

Explanation:

No answer description available for this question.

Question: Hydrogen ion concentration in distilled water is
[A].

10-7

[B].

7 x 10-7

[C].

107

[D].

7 x 107

Answer: Option A

Explanation:

No answer description available for this question.