Test: Environmental Engineering - 8 - Civil Engineering (CE) MCQ

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

Presence of a certain minimum quantity of flourine is desirable in potable water to prevent

Pick out the wrong statement.

Which of the following is not an air pollutant ?

Presence of high concentration of ozone and smog in atmospheric air causes the

Algae growth in water is controlled by

__________ is removed from water by lime-soda process.

Most of the bacteria in sewage are

Which of the following is the most major constituents of air pollutants ?

Shouting by a man at his full voice corresponds to a voice level of about __________ decibels.

Carbonaceous particles having size less than 1 μm are called

__________ substances present in sewage are removed in grit chamber during sewage treatment.

The type of bacteria which is active in trickling filter during biological treatment of sewage is the __________ bacteria.

Presence of dissolved impurities of __________ is responsible for the red brownish color of water.

TLV of aldrin in public water supply system is about __________ μg/litre.

A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from __________ ppm.

Removal of __________ is accomplished by aeration of water.

Green house effect is accentuated by

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

High concentration of carcinogenic hydrocarbon pollutants in atmospheric air causes

World environment day is observed every year on the 5th of

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