Environmental Engineering in CE MCQs

Question 1

The progressive warming up of the earth's surface is mainly due to the

Accepted Answer

Blanketing effect of CO2 in the atmosphere

Answer

Automobile exhaust

Answer

De-forestation

Answer

Thickening of ozone layer

Question 2

The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the

Accepted Answer

Relative stability

Answer

Bacterial stability factor

Answer

Biological oxygen demand (BOD)

Answer

Oxygen ion concentration

Question 3

Reinglemann chart is used for the measurement of the

Accepted Answer

Smoke density from a chimey

Answer

Combustibles present in automobile exhaust

Answer

Exhaust gas density

Answer

Flue gas temperature

Question 4

Aerosols present in atmospheric air may be

Accepted Answer

Combination of all A, B & C

Answer

Positively charged

Answer

Negatively charged

Answer

Neutral

Question 5

Pick out the wrong statement.

Accepted Answer

None of these

Answer

Biological oxygen demand (BOD) is a characteristic and not a constituent of water

Answer

BOD is a measure of the amount of oxygen which will be demanded & used in 5 days by the biological decomposition of the organic matter present in water stream present as food for the living organi

Answer

BOD is expressed in mg/litre (typically, BOD=2.5 mg/litre for potable water)

Question 6

Fresh domestic sewage is __________ in color.

Accepted Answer

Grey

Answer

Dark brown

Answer

Red

Answer

Black

Question 7

Maximum permissible residual chlorine in treated water should be __________ mg/litre.

Accepted Answer

02 to 0.3

Answer

0.001 to 0.01

Answer

2 to 3

Answer

5 to 10

Question 8

Carbonaceous particles having size less than 1 μm are called

Accepted Answer

Smoke

Answer

Grit

Answer

Aggregates

Answer

Aerosols

Question 9

Pick out the wrong statement.

Accepted Answer

H2S is not at all produced during combustion of sulphur bearing fuels as all the sulphur is oxidised to SO2

Answer

Benzopyrene which causes cancer is present in traces in tobacco, charcoal & petrol driven automobile exhaust

Answer

NO2 is capable of penetrating the troposphere and can absorb both ultraviolet & visible light

Answer

Hydrocarbon pollutants are produced by sweet gum, oak & natural rubber trees