Chapter-wise MCQ Questions

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Question-1. Air is a/an

  1. None of these
  2. element
  3. mixture
  4. compound
Answer-1

Question-2. If burning splinter is taken close to the gas jar filled with oxygen, taken gas formed is

  1. carbon monoxide
  2. nitrogen dioxide
  3. sulphur dioxide
  4. carbon dioxide
Answer-2

Question-3. In which of the following cities would there be maximum water vapour in the air on a sunny day in December?

  1. Mumbai
  2. Bangalore
  3. Delhi
  4. Srinagar
Answer-3

Question-4. Nitrogen is used

  1. All
  2. in preserving tinned foods
  3. in electric bulbs
  4. as a refrigerant
Answer-4

Question-5. Oxygen is consumed from atmosphere in the following process

  1. cultivation of land
  2. combustion of fuel
  3. absorbed by green plants during photosynthesis
  4. biological fixation by symbiotic bacteria
Answer-5

Question-6. Photosynthesis by plant releases

  1. NO<sub>2</sub>
  2. CO
  3. CO<sub>2</sub>
  4. O<sub>2</sub>
Answer-6

Question-7. The atmospheric layer nearest the earth's surface is the

  1. mesosphere
  2. troposphere
  3. stratosphere
  4. ionosphere
Answer-7

Question-8. The constituent of air that supports combustion is

  1. None of these
  2. oxygen
  3. nitrogen
  4. carbon dioxide
Answer-8

Question-9. The percentage composition of oxygen in air is

  1. None of these
  2. 1/4 of the volume
  3. 1/5 of the above volume
  4. 1/6th of the volume
Answer-9

Question-10. Which gas makes up major part of the air?

  1. Argon
  2. Hydrogen
  3. Helium
  4. Nitrogen
Answer-10

Question-11. Which of the following component of air cannot be taken directly by plants?

  1. None
  2. Nitrogen
  3. Carbon dioxide
  4. Oxygen
Answer-11

Question-12. Which of the following is a variable component of air ?

  1. Water vapour
  2. Carbon dioxide
  3. Nitrogen
  4. Oxygen
Answer-12

Question-13. Which of the following is second layer of atmosphere?

  1. Mesosphere
  2. Stratosphere
  3. Thermosphere
  4. Troposphere
Answer-13

Question-14. Which of the following represents correct order of abundance of various gases in air?

  1. Carbon dioxide> Nitrogen> Oxygen > Argon
  2. Nitrogen> Oxygen> Carbon dioxide> Argon
  3. Nitrogen> Oxygen> Argon> Carbon dioxide
  4. Oxygen > Nitrogen> Carbon dioxide> Argon
Answer-14

Question-15. Wind mill is used

  1. All
  2. to draw water from tubewells
  3. to generate electricity
  4. to run flour mills
Answer-15



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