Environmental Engineering in CE MCQs

Question 1

The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is

Accepted Answer

Cavitation

Answer

Pipe vibrations

Answer

Boundary layer separation

Answer

Fluctuation in liquid flow

Question 2

Pick out the wrong statement.

Accepted Answer

A bag filter incurs very small pressure drop and is very efficient for removal of sub-micronic dust particles from flue gases at very high temperature

Answer

A slight haze at the top of chimney indicates good combustion in the furnace

Answer

Electrostatic precipitator is the most efficient dust collection equipment for removal of sub-micronic dust particles present in flue gas

Answer

None of these

Question 3

Removal of __________ results from the disinfection of water.

Accepted Answer

Bacteria

Answer

Turbidity

Answer

Odour

Answer

Hardness

Question 4

Inhalation of lead compounds present in the automobile exhausts (using leaded petrol) causes

Accepted Answer

All of the above

Answer

Blood poisoning

Answer

Anaemia

Answer

Nervous system disorder

Question 5

Polyvinyl chloride containers are not suitable for storing

Accepted Answer

Foodstuffs

Answer

Woolen clothes

Answer

Metallic powder

Answer

None of these

Question 6

In the context of the chemical process industries, the term BOD is normally associated with the

Accepted Answer

Characterisation of liquid effluents

Answer

Characterisation of solid wastes

Answer

Organic concentration in gaseous effluents

Answer

Characterisation of boiler feed water

Question 7

Which of the following is not a weightless pollutant?

Accepted Answer

SPM

Answer

Thermal pollution

Answer

Radioactive rays

Answer

Noise pollution

Question 8

Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of __________ present in it.

Accepted Answer

Potassium cyanide

Answer

Coal ash

Answer

Ortho-xylene

Answer

None of these

Question 9

Which of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters?

Accepted Answer

Ra-226

Answer

I-131

Answer

Sr-90

Answer

Au-198