GATE CE Air Pollution PYQs & Answers — Page 2

Questions 11–20 of 29. Imported answers require independent review unless marked reviewed.

Which of the following statements is/are TRUE in relation to the Maximum Mixing Depth (or Height) '

' in the atmosphere?

Your answerSelect all correct options. You can choose more than one.

is always equal to the height of the layer of unstable air

Ventilation coefficient depends on

A smaller

will have a smaller air pollution potential if other meteorological conditions remain same

Vertical dispersion of pollutants occurs up to

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A process equipment emits 5 kg/h of volatile organic compounds (VOCs). If a hood placed over the process equipment captures 95% of the VOCs, then the fugitive emission in kg/h is

Your answerChoose one option.

0.25

4.75

2.50

0.48

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A sample of air analyzed at 25 °C and 1 atm pressure is reported to contain 0.04 ppm of SO

. Atomic mass of S = 32, O = 16.

The equivalent SO

concentration (in μg/m

) will be __________. (round off to the nearest integer)

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The liquid forms of particulate air pollutants are

Your answerChoose one option.

dust and mist

mist and spray

smoke and spray

fly ash and fumes

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Which of the following statement(s) is/are correct?

Your answerSelect all correct options. You can choose more than one.

Increased levels of carbon monoxide in the indoor environment result in the formation of carboxyhemoglobin and the long term exposure becomes a cause of cardiovascular diseases.

Volatile organic compounds act as one of the precursors to the formation of photochemical smog in the presence of sunlight.

Long term exposure to the increased level of photochemical smog becomes a cause of chest constriction and irritation of the mucus membrane.

Increased levels of volatile organic compounds in the indoor environment will result in the formation of photochemical smog which is a cause of cardiovascular diseases.

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Read the statements given below. (i) Value of the wind profile exponent for the ‘very unstable’ atmosphere is smaller than the wind profile exponent for the ‘neutral’ atmosphere. (ii) Downwind concentration of air pollutants due to an elevated point source will be inversely proportional to the wind speed. (iii) Value of the wind profile exponent for the ‘neutral’ atmosphere is smaller than the wind profile exponent for the ‘very unstable’ atmosphere. (iv) Downwind concentration of air pollutants due to an elevated point source will be directly proportional to the wind speed. Select the correct option.

Your answerChoose one option.

(i) is False and (iii) is True

(i) is True and (iv) is True

(ii) is False and (iii) is False

(ii) is False and (iv) is False

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A baghouse filter has to treat 12 m³/s of waste gas continuously. The baghouse is to be divided into 5 sections of equal cloth area such that one section can be shut down for cleaning and/or repair, while the other 4 sections continue to operate. An air-to-cloth ratio of 6.0 m³/min-m² cloth will provide sufficient treatment to the gas. The individual bags are of 32 cm in diameter and 5 m in length. The total number of bags (in integer) required in the baghouse is ________.

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A gas contains two types of suspended particles having average sizes of 2 μm and 50 μm. Among the options given below, the most suitable pollution control strategy for removal of these particles is

Your answerChoose one option.

settling chamber followed by bag filter

electrostatic precipitator followed by venturi scrubber

electrostatic precipitator followed by cyclone separator

bag filter followed by electrostatic precipitator

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A gaseous chemical has a concentration of 41.6 μmol/m

in air at 1 atm pressure and temperature 293 K. The universal gas constant

is 82.05×10

atm)/(mol K). Assuming that ideal gas law is valid, the concentration of the gaseous chemical (in ppm, round off to one decimal place), is _____.

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Which one of the following options contains ONLY primary air pollutants?

Your answerChoose one option.

Hydrocarbons and nitrogen oxides

Hydrocarbons and ozone

Ozone and peroxyacetyl nitrate

Nitrogen oxides and peroxyacetyl nitrate

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GATE CE Air Pollution PYQs

Question 50

Question 22

Question 61

Question 13

Question 17

Question 32

Question 51

Question 17

Question 53

Question 9