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Air: Composition, Properties, and Pollution

Questions about atmospheric layers, composition of air, air pollution causes, and chemical processes involving atmospheric gases.

9 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Which is the lowest portion of the Earth's atmosphere?

  1. Ionosphere
  2. Stratosphere
  3. Troposphere
  4. Thermosphere
Question 2 Multiple Choice (Single Answer)

Which of the following statements is correct?

  1. Carbon dioxide allows the Earth to radiate heat rapidly at night.
  2. Percentage of carbon dioxide in air varies form 0.03% to 0.04%.
  3. Radon is not a cancer causing radioactive gas.
  4. A combustible substance combines with nitrogen to liberate heat energy.
Question 3 Multiple Choice (Single Answer)

Which of the following causes air pollution?

  1. Thermal power stations
  2. Coal factories
  3. Nuclear plants
  4. All of the above
Question 4 Multiple Choice (Single Answer)

Which of the given statements about components of air is/are correct?
(i) Nitrogen helps in diluting the effect of carbon dioxide.
(ii) Oxygen supports combustion and burning.
(iii) Noble gases are present in large quantities in air.
(iv) Water vapours are present in large quantities in air.

 

  1. Only (i) and (ii)
  2. <span style="font-family:">Only<span style="font-family:"> (ii) and (iii)
  3. <span style="font-family:">Only<span style="font-family:"> (ii)
  4. <span style="font-family:">Only<span style="font-family:"> (ii) and (iv)
Question 5 Multiple Choice (Single Answer)

A beaker full of lime water kept in air for about one hour turns milky. It is due to the presence of which gas?

  1. Nitrogen
  2. Methane
  3. Oxygen
  4. Carbon dioxide
Question 6 Multiple Choice (Single Answer)

Which of the following facts justifies the given characteristics of air?
“The components retain their original properties”

  1. Amount of water vapours in air is higher in monsoon than that in the summer.
  2. Oxygen elements support burning. Oxygen present in the air supports burning too.
  3. There is no release or absorption of energy if a sample of air is prepared.
  4. Nitrogen and oxygen can be separated by boiling and condensing the liquid air.
Question 7 Multiple Choice (Single Answer)

With which of the following gases does a substance combine during combustion to produce a new substance along with energy?

  1. Nitrogen
  2. Carbon dioxide
  3. Oxygen
  4. Hydrogen
Question 8 Multiple Choice (Single Answer)

Which of the following statements is correct about natural gas?

  1. It occurs in nature in solid form.
  2. It causes air pollution.
  3. It is expensive than petrol.
  4. It is supplied by pipelines as compressed natural gas (CNG).
Question 9 Multiple Choice (Single Answer)

Which of the following processes removes oxygen from the atmosphere?

  1. Volcanic eruption
  2. Combustion
  3. Photosynthesis
  4. None of these
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