Explore topic-wise MCQs in Environmental Science.

This section includes 17 Mcqs, each offering curated multiple-choice questions to sharpen your Environmental Science knowledge and support exam preparation. Choose a topic below to get started.

1.

Chlorides are estimated by titration with a standard silver nitrate solution by using _______as indicator.

A. Potassium manganate
B. Potassium chloride
C. Potassium chromate
D. Potassium dichromate
Answer» D. Potassium dichromate
Discussion
2.

State whether the following statement is True or False.Gelatin liquefying bacteria are helpful in the manufacturing of photographic films.

A. True
B. False
Answer» B. False
Discussion
3.

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

A. 10-6
B. 10-7
C. 10-8
D. 10-9
Answer» D. 10-9
Discussion
4.

State whether the following statement is True or False.Carbonate hardness can be removed by adding lime to water.

A. True
B. False
Answer» B. False
Discussion
5.

What is the indicator used in EDTA method?

A. Potassium chromate
B. Potassium dichromate
C. Potassium chloride
D. Erio chrome, black T
Answer» E.
Discussion
6.

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?

A. Clark's method
B. Hehner's method
C. Versenate method
D. EDTA method
Answer» B. Hehner's method
Discussion
7.

Which of the following statement is/are correct regarding coliform bacteria?1. It is gram negative2. It is rod shaped bacteria3. It is a harmless aerobic microorganism

A. 1, 2, 3
B. 2, 3
C. 1, 3
D. 1,2
Answer» B. 2, 3
Discussion
8.

State whether the following statement is True or False.Threshold odour number testing is preferred in hot water.

A. True
B. False
Answer» C.
Discussion
9.

Which of the following statement is wrong regarding turbidity?

A. It is an extent to which light is absorbed by particles in the water
B. It is expressed in ppm
C. It depends on the fineness of particle present in the water
D. Turbidity rod is a laboratory method to measure turbidity
Answer» E.
Discussion
10.

Which of the following statement is wrong regarding permanent hardness?

A. It is also called carbonate hardness
B. It is due to the presence of sulfates, chlorides and nitrates of calcium and magnesium
C. It cannot be removed by boiling
D. It requires special methods of water softening to get removed
Answer» B. It is due to the presence of sulfates, chlorides and nitrates of calcium and magnesium
Discussion
11.

If the PO value is 6, what does it imply?

A. No perceptible odour
B. Very faint odour
C. Very distinct odour
D. Extremely strong odour
Answer» E.
Discussion
12.

If the acid and gas are formed in the multiple tube fermentation technique, the test is _____

A. Positive
B. Continued
C. Negative
D. Discarded
Answer» B. Continued
Discussion
13.

The permissible limit of pH preferred for potable water is ___ppm.

A. 6.5-9
B. 7-8.5
C. 10-14
D. 0-7
Answer» B. 7-8.5
Discussion
14.

One JTU is equivalent to turbidity produced by

A. 1mg of fine silica dissolved in 1L of distilled water
B. 1g of fine silica dissolved in 1L of distilled water
C. 1g of fine silica dissolved in 1ml of distilled water
D. 1mg of fine silica dissolved in 1ml of distilled water
Answer» B. 1g of fine silica dissolved in 1L of distilled water
Discussion
15.

Which bacteria results in the corrosion of iron and steel pipes embedded in soil?

A. Escherichia coli bacteria
B. Bacterium coli bacteria
C. Iron bacteria
D. Sulphur bacteria
Answer» E.
Discussion
16.

The range of temperature of water that is required to do the temperature test is__ 0C.

A. 10-25
B. 0-25
C. 10-30
D. 20-30
Answer» B. 0-25
Discussion
17.

One degree of hardness is equivalent to ___ ppm

A. 2
B. 1
C. 10
D. 100
Answer» C. 10
Discussion