Environmental Engineering in CE MCQs

Question 1

Corrosion in boilers can be prevented by

Accepted Answer

All of the above

Answer

Deaeration of feed water

Answer

Enhancing pH of feed water by adding alkali

Answer

Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion

Question 2

Iron & manganese present as pollutant in water can not be removed by

Accepted Answer

Chlorination

Answer

Ion exchange process

Answer

Oxidation followed by settling & filtration

Answer

Lime soda process or manganese zeolite process

Question 3

Which of the following is the most widely used disinfectant in water treatment?

Accepted Answer

Chlorine

Answer

Irradiation of water by ultraviolet light

Answer

Cation exchanger

Answer

Coagulation

Question 4

The widest explosive limit is of __________ , thereby making it the most explosive gas.

Accepted Answer

Acetylene

Answer

Petrol vapor

Answer

Hydrogen

Answer

Carbon monoxide

Question 5

Siderosis is a disease caused by the inhalation of __________ dust.

Accepted Answer

Iron

Answer

Coal

Answer

Silica

Answer

None of these

Question 6

'Pneumoconiosis' is a disease caused by the inhalation of __________ dust.

Accepted Answer

Coal

Answer

Uranium ore

Answer

Iron ore

Answer

Lime

Question 7

Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of

Accepted Answer

CFC (chloro fluoro carbon)

Answer

CO2

Answer

SO2

Answer

Hydrocarbons

Question 8

Scale formation in boiler is controlled by

Accepted Answer

Reduction in hardness, silica & alumina in feed water

Answer

Preheating of feed water

Answer

Keeping the pH value of feed water just below 7

Answer

Eliminating H2S in feed water

Question 9

Pick out the wrong statement.

Accepted Answer

Sulphur dioxide is the main pollutant emitted from the exhaust of petrol driven automobiles

Answer

Catalytic converter is fitted in automobiles to reduce carbon monoxide concentration in exhaust emissions

Answer

Inhalation of pollutant carbon monoxide results in death by asphyxiation

Answer

Decomposition of plants containing chlorophyll is a natural source of carbon monoxide in atmosphere