Olympiad – Class VI – Science - Che - Air around us

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Question - 1

Which of the following processes need oxygen?

  • A Combustion
  • B Respiration
  • C Oxidation
  • D All of the above

Question - 2

Which of the following statements is true regarding the earth's atmosphere?

  • A It gets denser with an increase in the altitude.
  • B It gets thinner with an increase in the altitude.
  • C It remains the same.
  • D It contains no solid particles.

Question - 3

When we heat water, we find bubbles coming from it. This shows that

  • A water contains air.
  • B air contains water.
  • C water itself converts into bubbles.
  • D water contains dissolved minerals.

Question - 4

Which of the following plays a very important role in the oxygen cycle?

  • A Birds 
  • B Animals
  • C Plants
  • D Soil

Question - 5

Mountaineers carry oxygen cylinders with them because

  • A oxygen supports combustion.
  • B oxygen is less at higher altitudes.
  • C more oxygen is needed to cook food.
  • D oxygen does not support combustion.

Question - 6

Which of the following can show the direction of the wind?

  • A An anemometer
  • B A wind mill
  • C A windvane
  • D A barometer

Question - 7

Which of the constituents of air on increasing, causes global warming?

  • A Nitrogen
  • B Oxygen
  • C Inert gases
  • D Carbon dioxide

Question - 8

The percentage of water vapour present in air is called

  • A density.
  • B mass.
  • C humidity.
  • D solubility.

Question - 9

Plants require nitrogen for

  • A reproduction.
  • B photosynthesis.
  • C transpiration.
  • D their growth.

Question - 10

Which of the following gases cause the harmful greenhouse effect?

  • A Hydrogen 
  • B Oxygen
  • C Carbon dioxide
  • D Nitrogen