Chapter-wise MCQ Questions

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Question-1. Air is a/an

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

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

  1. nitrogen dioxide
  2. sulphur dioxide
  3. carbon dioxide
  4. carbon monoxide
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. Bangalore
  2. Delhi
  3. Srinagar
  4. Mumbai
Answer-3

Question-4. Nitrogen is used

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

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

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

Question-6. Photosynthesis by plant releases

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Question-15. Wind mill is used

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



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