Environmental Engineering in CE MCQs

Question 1

Brown spots in fabrics will be caused by washing with water containing large amount of .

Accepted Answer

Iron

Answer

Zinc

Answer

Iodine

Answer

Bromine

Question 2

Soluble silica present in boiler feed water can be removed by

Accepted Answer

Anion exchanger

Answer

Coagulation

Answer

Filtration

Answer

Preheating it

Question 3

Deaeration of high pressure boiler feed water is done to reduce

Accepted Answer

Its dissolved oxygen content

Answer

Foaming from boilers

Answer

Its silica content

Answer

Caustic embrittlement

Question 4

Salt content in sea water is about __________ percent.

Accepted Answer

3.5

Answer

0.5

Answer

1

Answer

10

Question 5

Thermal pollution due to excessive heat & temperature in the working place causes

Accepted Answer

All of the above

Answer

Reduction in working efficiency of manpower

Answer

Fatigue

Answer

High breathing rate

Question 6

Which of the following processes is involved in the biochemical treatment of sewage effluents?

Accepted Answer

Oxidation

Answer

Reduction

Answer

Dehydration

Answer

Fermentation

Question 7

Ionisation potential employed in the industrial electrostatic precipitator is of the order of

Accepted Answer

30 to 70 kV DC

Answer

30 to 70 kV AC

Answer

230 V AC

Answer

230 V DC

Question 8

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

Accepted Answer

Both A & B

Answer

With greater number of blades

Answer

Of increased diameter

Answer

Neither A nor B

Question 9

Growth of __________ is promoted by the presence of manganese in water.

Accepted Answer

Micro-organisms

Answer

Files

Answer

Algae

Answer

Mosquitoes