Introduction to Air Pollutants & Troposhpheric Pollutants

Q. The pollutants which come directly in the air from sources are called primary pollutants. Primary pollutants are sometimes converted into secondary pollutants. Which of the following is the secondary pollutant?

1. CO
2. PAN
3. $S{O}_2$
4. Aerosol

Q. Name the regions of the atmosphere where oxygen and ozone play key roles respectively-

Q. The most abundant hydrocarbon pollutant is-

1. ethane
2. methane
3. propane
4. butane

Q.

Which of the following statements about control of particulate pollution is not correct?

1. Gravity settling chamber removes larger particles from the air

2. Cyclone collector removes fine particles in the diameter range 5-20 m

3. Wet scrubbers are used to wash away all types of particulate matter

4. In electrostatic precipitator, the particulates are made to acquire positive charge which then attracted by negative electrode and removed.

Q. Which of the followings is incorrect?

1. The lowest region of atmosphere is known as Troposphere.
2. CO gas forms highly stable complex with blood known as carboxyhaemoglobin.
3. Water vapor present in the atmosphere acts as greenhouse gas.
4. Rain having pH value less than 7 is known as acid rain.

Q. Atmospheric pollution is generally studied as

Q. Recently discovered micro organisms capable of metabolising chlorinated hydrocarbons possess

1. Enzyme dehalogenase

2. Peroxybenzoyl nitrate

3. Cobalamine

4. Carboxyharmoglobin

Q.

Particulate air pollutants include:

1. Dust

2. Smoke

3. Smog

4. All of these

Q. Which of the following is not a green house gas?

1. Carbon dioxide
2. water vapour
3. methane
4. oxygen gas

Q. Incomplete combustion of petrol or diesel oil in automobile engines can bes best detected by testing the fuel gases for the presence of-

1. carbon monoxide and water vapour
2. carbon monoxide
3. nitrogen dioxide
4. sulphur dioxide

Q.

The chief consumer (sink) for $C\stackrel{.}{l}$ and $C\stackrel{.}{l}O$ which cause ozone deplection is

1. $S{O}_2$
2. $N{O}_2$

3. $C{H}_2$

4. Both b and c

Q. The mesosphere (literally middle sphere) is the third highest layer in our atmosphere, occupying the region _____ km to _______ km above the surface of the Earth.

1. 50, 85
2. 50, 80
3. 56, 75
4. none of these

Q.

Which of the following statements about control of particulate pollution is not correct?

1. Gravity settling chamber removes larger particles from the air

2. Cyclone collector removes fine particles in the diameter range 5-20 m

3. Wet scrubbers are used to wash away all types of particulate matter

4. In electrostatic precipitator, the particulates are made to acquire positive charge which then attracted by negative electrode and removed.

Q.

Identify the wrong statements in the following

1. Chlorofiuorocarbons are responsible for ozone layer depletion

2. Greenhouse effect is responsible for global warming

3. Ozone layer does not permit infrared radiation from the sun to reach the earth

4. Acid rains is mostly because of oxides of nitrogen and sulphur.

Q. Which of the following is the major air pollutant?

1. ${\text{CO}}_2$
2. ${\text{NO}}_2$
3. $\text{CO}$
4. ${\text{SO}}_2$

Q. Which one of the following is not a common component of Photochemical song ?

1. Ozone
2. Acrolein
3. Peroxyacetyl nitrate
4. Chlorofluorocarbons

Q. Height of Mesosphere above the earth's surface in ( Km)__________.

1. 0--10
2. 50--85
3. 10--50
4. 85--100

Q.

Which one of the following is not a greenhouse gas?

1. nitrogen

2. CFCs

3. methane

4. carbon dioxide