Free Printable ENV Water supply engineering

1.

The permissible limit of Nitrate in drinking water as per IS 10500 : 2012

a)

45mg/l

b)

0.3mg/l

c)

0

d)

0.15mg/l

2.

Titrant $AgNO_3$ and indicator $K_2CrO_4$ is used in the measurement of which of the following water quality parameter?

a)

Nitrogen content

b)

Chloride content

c)

Fluoride content

d)

Dissolved oxygen

3.

Match the metal ions and the commonly used indicators

i) Iron ii) Manganese iii) Fluoride

a) Ammonium persulphate + Nitricacid
b) 1, 10 Phenanthroline
c) Zirconium -alizarin

a)

a b c

b)

a c b

c)

b a c

d)

c a b

4.

The permissible limit of chlorine content in drinking water in the absence of alternate source as per IS 10500: 2012

a)

250 ppm

b)

1000 ppm

c)

0.2 ppm

d)

1 ppm

5.

The permissible limit of iron in drinking water in the absence of alternate source as per IS 10500: 2012

a)

1 ppm

b)

2 ppm

c)

0.3 ppm

d)

0.9 ppm

6.

In the design of a plain sedimentation tank, the ratio of discharge to surface area will give

a)

Overflow velocity

b)

Flow-through velocity

7.

Copperas is

a)

$FeSO_4.\ 7H_2O$

b)

$FeSO_4.\ 18H_2O$

c)

$Fe_2\left(SO_4\right)_3.\ 7H_2O$

d)

$FeCl_3.\ 7H_2O$

8.

Uniformity coefficient of sand used in slow sand gravity filter

a)

1.8 to 3

b)

3 to 3.9

c)

1 to 1.8

d)

3.9 to 5.2

9.

Backwashing in Rapid sand gravity filter is done once in every

a)

12-24 hrs

b)

24-48 hrs

c)

48-36 hrs

d)

36-72 hrs

10.

Electro Katadyn process in the treatment of drinking water is done with

a)

Ag

b)

Hg

c)

Au

d)

Br

11.

Which of the following are correct

a)

Plain chlorination: is done after filtration

b)

Pre chlorination: is done before sedimentation

c)

Pre chlorination: is done before filtration

d)

Post chlorination: is done after filtration

12.

Chemicals used in Nalgonda process

a)

Lime

b)

Bleaching powder

c)

Alum

d)

Copper sulphate

13.

Alum will work as a coagulant at its best when pH is in range

a)

6.5-8.5

b)

5-6.5

c)

<6.5

d)

>8.5

14.

Fluoride content in drinking water must be in the range

a)

<1 ppm

b)

1-2 ppm

c)

1-1.5 ppm

d)

>2 ppm

15.

Find the odd man out

a)

Globe valve

b)

Ball valve

c)

Gate valve

d)

Butterfly valve

ENV Water supply engineering

Total questions: 15

Worksheet time: 6mins

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