Environmental Engineering in CE MCQs

Question 1

Ozone is

Accepted Answer

Both B & C

Answer

A primary pollutant

Answer

A secondary pollutant

Answer

Impervious to ultra-violet rays

Question 2

Pick out the wrong statement

Accepted Answer

Carbon monoxide present in the two stroke petrol engine exhaust is much less as compared to that emitted from a four stroke engine

Answer

Low ozone layer thickness in polar regions is due to cold climatic conditions

Answer

Amount of unburnt hydrocarbons emitted by two stroke petrol engine is more as compared to that emitted by a four stroke engine

Answer

Mercury as a pollutant can enter the blood stream & the digestive system/ lungs and is responsible for causing minamate disease

Question 3

High noise level in a chemical plant can be controlled by the

Accepted Answer

All of the above

Answer

Suppression of noise at the source itself

Answer

Path control of noise

Answer

Protection of operating personnel

Question 4

Which of the following fine dust removal equipments is the most efficient?

Accepted Answer

Electrostatic precipitator

Answer

Bag filter

Answer

Scrubber

Answer

Cyclone separator

Question 5

When the concentration of SO2 in air is greater than __________ ppm, it gives a pungent smell.

Accepted Answer

4

Answer

0.01

Answer

0.1

Answer

1

Question 6

Aerobic biological oxidation ponds used for the purification of polluted water

Accepted Answer

All of the above

Answer

Destroys/removes pathogen from the sewage

Answer

Is not very effective for nonbiodegradable substances (e.g. ABS) containing effluents

Answer

Destroys/removes pathogen much more effectively if the sewage is chlorinated

Question 7

Lagoons used for purification of polluted water

Accepted Answer

All of the above

Answer

Are large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds

Answer

Use micro-organisms/bacteria in presence of dissolved oxygen

Answer

Gives an excellent final effluent (with 3 to 4 lagoons arranged in series) having suspended solid < 1 mg/litre and BOD = 3.8 mg/litre

Question 8

Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre)?

Accepted Answer

Activated carbon adsorption

Answer

Lagooning

Answer

Biological oxidation pond

Answer

Chemical coagulation

Question 9

Presence of __________ bacteria in water causes disease like typhoid.

Accepted Answer

Pathogenic

Answer

Aerobic

Answer

Anaerobic

Answer

Non-pathogenic