Air Pollution

Q.

Contamination of air by unwanted substances is called ______.

1. air utilisation

2. air pollution

3. air purification

4. air conservation

Q. Read the given paragraph carefully and fill in the blanks by choosing the appropriate option.

___(i)___ is a thick, dark, strong-smelling liquid found deep in the earth. Unrefined (i) is called ___(ii)___ and ___(iii)___ gets collected over (i) inside the earth. During fractional distillation of (i), the fraction with ___(iv)___boiling point condenses in the uppermost region and uncondensed ___(v)___ comes out of the fractionating tower.

1. (i)–Kerosene; (ii)–Petrol;
   (iii)-Hydrogen gas; (iv)-Lowest;
   (V)-Methane gas
2. (i)-Petroleum; (ii)–Crude oil;
   (iii)-Natural gas; (iv)-Lowest;
   (V)-Petroleum gas
3. (i)–Petrol; (ii)–Petroleum;
   (iii)-Methane gas; (iv)-Highest;
   (V)-Natural gas
4. (i)-Petrol; (ii)-Petroleum;
   (iii)-Hydrogen gas; (iv)-Highest;
   (V)-Natural gas

Q.

Which of the following represents the correct composition of air by volume?

1. Nitrogen - 21%, oxygen - 78% and other gases such as carbon dioxide, argon, methane, ozone and water vapour are present in small quantities.

2. Nitrogen - 60%, oxygen - 38% and other gases such as carbon dioxide, argon, methane, ozone and water vapour are present in small quantities.

3. Nitrogen - 21%, oxygen - 78% and other gases such as carbon dioxide, argon, methane, ozone and water vapour are present in small quantities.

4. ​Nitrogen - 38%, oxygen - 60% and other gases such as carbon dioxide, argon, methane, ozone and water vapour are present in small quantities.

Q. Which of the following is not a source of air pollution?

1. Burning of firewood
2. Automobile exhaust
3. Windmills
4. Power plants

Q. Alina was asked to list the causes of air pollution. She made the following list:
A. Burning of Coal
B. Burning of Liquefied Petroleum Gas
C. Burning of Compressed Natural Gas
D. Exhaust from factories and industries
Which are the correct causes in this list?

1. A, B and C
2. All of the above
3. A and B
4. Only A

Q.

What is the best method to avoid pollution, if you are using plastic bags?

1. Throw the plastic bags into the river

2. Bury the plastic bags in the soil

3. Use biodegradable plastic bags

4. Burn the plastic bags in a rubbish dump

Q.

Identify the chemical formula of Ozone gas.

1. [O]

2. $O_2$

3. $O_3$

4. $O_{1.5}$

Q. Sulphur oxides combine with water vapour to produce sulphuric acid.

1. False
2. True

Q.

Which of the following gas is released by refrigerators and air conditioners?

1. Water gas

2. Chlorofluorocarbons

3. Hydrochloric acid

4. Methane

Q. Use of electric cars can reduce air pollution.

1. False
2. True