My Report (&Account)

Water Quality Test – 1

Correct Answer: 2 points | Wrong: -1 point
Grades: A* (100% score) | A (80%-99%) | B (60%-80%) | C (40%-60%) | D (0%-40%)

1. In which method of determining total hardness of water is based on the premise that hardness producing substance react with soap and form insoluble compounds before lather is produced?

Versenate method

EDTA method

Hehner’s method

Clark’s method

2. Which of the following statement is wrong regarding permanent hardness?

It is due to the presence of sulfates, chlorides and nitrates of calcium and magnesium

It cannot be removed by boiling

It requires special methods of water softening to get removed

It is also called carbonate hardness

3. Carbonate hardness can be removed by adding lime to water.

True

False

4. Given list 1 and list 2, find which of the following pair is correctly matched?

List 1 (Chemical substance)	List 2 (Permissible limit in ppm)
A. Lead	1. 0.05
B. Phenol	2. 0.001
C. Zinc	3. 0.01
D. Chromium	4. 5
	5. 0.2

A-5

B-3

C-4

D-2

5. What is the indicator used in EDTA method?

Erio chrome, black T

Potassium chloride

Potassium chromate

Potassium dichromate

6. One degree of hardness is equivalent to ___ ppm.

100

7. What can be filled in place of the question mark in the following table?

Degree of hardness	Nature of water
1	Extremely soft water
2	Very soft water
3	Soft water
9	?

Reasonably soft water

Excessive hard water

Hard water

Very hard water

8. What is the concentration of H+ ions in moles/L in water if the pOH value is 6?

10^-9

10^-6

10^-8

10^-7

9. Chlorides are estimated by titration with a standard silver nitrate solution by using _______ as an indicator.

Potassium dichromate

Potassium chloride

Potassium chromate

Potassium manganate

10. The permissible limit of pH preferred for potable water is ___ ppm.

6.5-9

10-14

0-7

7-8.5

Start practicing “1000 MCQs on Environmental Engineering”, and once you are ready, you can take tests on all topics by attempting our “Environmental Engineering Test Series”.

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Manish Bhojasia - Founder & CTO at Sanfoundry

Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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