Test: Quality Control of Water Supply - 1 | 10 Questions MCQ Test Environmental Engineering Civil Engineering (CE)

QUESTION: 1

The standard turbidity produced by one mg of silicon dioxide (silica) in one litre of distilled water, is called

A.
one Jackson turbidity unit (JTU)
B.
one Formazin turbidity unit (FTU)
C.
one Nephelometry turbidity unit (NTU)
D.
None of the above

Solution:

QUESTION: 2

Pick up the correct statement(s)

A.
turbidimeters are frequently used to measure turbidities of raw supplies
B.
turbidimeters are frequently installed on line in treatment plant, to measure turbidities of sedimented filtered waters
C.
Nephelometers are frequently used to check and measure the turbidites of final disinfected supplies
D.
All of the above

Solution:

QUESTION: 3

One True Colour Unit (TCU) is the colour produced by

A.
one mg of formazin in one litre of distilled water
B.
one mg of silicon in one litre of distilled water
C.
one mg of ferric silicon in one litre of distilled water
D.
one mg of platinum as chloroplatinate ions in one litre of distilled water

Solution:

QUESTION: 4

The threshold odour number (TON) for a water sample of 40 ml, diluted to standard 200 ml mixture, in which odour is just barely detectable to the sense of smell, is

A.
8
B.
5
C.
50
D.
None of these

Solution:

Threshold odour number represents the dilution ratio at which the odour is hardly detectable,
TON = 200/40 = 5

QUESTION: 5

Water is considered ‘hard’, if its hardness is of the order of

A.
50 ppm
B.
100ppm
C.
200 ppm
D.
300 ppm

Solution:

Water with hardness upto 75 ppm are considered soft while those with 200 ppm and above are considered hard. In between the waters are considered as moderately hard.

QUESTION: 6

Higher quantities of copper, more than 2.5 mg/l or so, may cause diseases pertaining to

A.
kidneys
B.
lungs
C.
lever
D.
arsenic

Solution:

High quantities of copper are likely to affect human lungs and other respiratory organs.

QUESTION: 7

The maximum allowable concentration of iron in water is

A.
1.0 ppm
B.
0.05 ppm
C.
0.3 ppm
D.
0.03 ppm

Solution:

Higher concentration of iron above 0.3 ppm causes discolouration of clothes and incrustation in water mains.

QUESTION: 8

The commonly used indicator for measuring iron concentration in water is

A.
Eriochrome black T
B.
1,10, phenanthroline
C.
Phenolphthalein
D.
Blue litmus

Solution:

Eriochrome black T is used to measure hardness. Phenolphthalein is used to measure alkalinity. Blue litmus is used to measure acidity of water.

QUESTION: 9

The maximum safe permissible limit of chlorides in domestic water supplies is

A.
0.5 mg/l
B.
2.5 mg/l
C.
250 mg/l
D.
100 mg/l

Solution:

QUESTION: 10

Breweries and distilleries preferably require

A.
hard water
B.
soft water
C.
potable water
D.
None of these

Solution:

Test: Quality Control of Water Supply - 1

10 Questions MCQ Test Environmental Engineering | Test: Quality Control of Water Supply - 1

The standard turbidity produced by one mg of silicon dioxide (silica) in one litre of distilled water, is called

Pick up the correct statement(s)

One True Colour Unit (TCU) is the colour produced by

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