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Environmental Engineering Online Exam Quiz

Important questions about Environmental Engineering. Environmental Engineering MCQ questions with answers. Environmental Engineering exam questions and answers for students and interviews.

1. Oil and grease present in an emulsified state in waste water discharged from industries can be removed by

Options

A : biological oxidation.

B : skimming off.

C : settling out using chemical reagents.

D : chlorination.

2. Presence of soluble organics in polluted water causes

Options

A : undesirable plants growth.

B : depletion of oxygen.

C : fire hazards.

D : explosion hazards.

3. Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan

Options

A : with greater number of blades.

B : of increased diameter.

C : both (a) & (b).

D : neither (a) nor (b).

4. Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly __________ substances.

Options

A : radioactive

B : organic

C : inorganic

D : none of these

5. Foaming and priming in boiler operation can be reduced by reduction in __________ in feed water.

Options

A : turbidity

B : color (Hazen)

C : total solids

D : all (a), (b) & (c)

6. COD of raw municipal sewage may be in the range of about __________ mg/litre.

Options

A : 1-2

B : 5-10

C : 90-120

D : 1500-2500

7. Noise level during normal conversation among men is about __________ decibles.

Options

A : 10

B : 45

C : 90

D : 115

8. Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in

Options

A : coagulation and flocculation of colloids.

B : oxidation of carbonaceous matter to CO 2 .

C : nitrification or oxidation of ammonia derived from breakdown of nitrogeneous organic matter to the nitrite and eventually to the nitrate.

D : all (a), (b) and (c).

9. Iron & manganese present in the polluted water is removed by

Options

A : simple filtration.

B : oxidation followed by settling & filtration.

C : chemical coagulation.

D : chlorination only.

10. The main industrial source of emission of hydrogen sulphide air pollutant is

Options

A : petroleum refineries.

B : coal based thermal power plants.

C : pulp and paper plant.

D : metallurgical roasting & smelting plant.

1. Fresh sewage is __________ in nature.

Options

A : acidic

B : neutral

C : alkaline

D : highly acidic

2. The earth's atmosphere is an envelope of gases present upto a height of about __________ kms.

Options

A : 10

B : 200

C : 1000

D : 2000

3. Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gas-air mixture), rendering it the property of the most explosive gas?

Options

A : Hydrogen

B : Acetylene

C : Carbon monoxide

D : Ammonia

4. A standard test for determination of hardness in water is termed as __________ test.

Options

A : EDTA

B : electometric

C : total count

D : presumptive

5. Which of the following is not a weightless pollutant?

Options

A : SPM

B : Thermal pollution

C : Radioactive rays

D : Noise pollution

6. Aerosols present in atmospheric air may be

Options

A : positively charged.

B : negatively charged.

C : neutral.

D : combination of all (a), (b) & (c).

7. Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by

Options

A : quenching of hot coke.

B : discharging in the river stream.

C : filtration and recycling for cooling coke oven gas.

D : none of these.

8. For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than __________ ppm.

Options

A : 10000

B : 5

C : 500

D : 1000

9. In a sedimentation tank, the detention period for water ranges from __________ hours.

Options

A : 2 to 4

B : 8 to 12

C : 16 to 20

D : 24 to 32

10. The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels.

Options

A : 60

B : 90

C : 105

D : 120

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