Test: Environmental Engineering - 6

__________ plant emits large amount of SO₂ as an air pollutant.

Noise pollution level in a chemical plant is expressed in

The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels.

The most commonly used chemical coagulant in water treatment is

The biological decomposition of organic substances in wastes controlled conditions is called

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

Smog is not formed due to the presence of __________ in the atmosphere.

Pick out the correct statement.

Which of the following is not a source of ozone emission in the atmosphere ?

Oceans act as sinks for atmospheric gases including carbon dioxide whose concentration in the atmosphere is increased by the

Pick out the correct statement.

The upper layer of atmosphere is called the

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

Pick out the wrong statement

Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by

5-200 μm size particles are called

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

The effect of increase in carbon dioxide level of the atmosphere and its profound effect on our climate is called the

Arsenic pollutant is not generated in____industries.

The resistance of water to the passage of light through it is a measure of the

Color test of water is done with an instrument called

Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gas-air mixture), rendering it the property of the most explosive gas ?