The Air Around Us (Set 4)

  • Please choose the best answer for each question.
    • 1. Which of the following has a varying amount?
      • A) Oxygen
      • B) Nitrogen
      • C) Carbon dioxide
      • D) Dust particles
    • 2. Which of the following gases will increased in a closed stadium full of people?
      • A) Oxygen
      • B) Nitrogen
      • C) Rare gases
      • D) Carbon dioxide
    • 3. Which of the following statements is not true?
      • A) Air is a compound
      • B) Earth is surrounded by a layer of air known as atmosphere
      • C) The high percentage of nitrogen in air helps dilute the reactivity of oxygen
      • D) The constituents of air have variable ratios
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