Class VI

Hot air balloon rises up in the air because?
  1. Hot air is heavier than cold air
  2. Hot air is lighter than cold air
  3. Hot air does not play any role in rising up the balloon
  4. Hot air contains water vapours which push up the balloon.
Which gas is taken by plants to prepare their food 
  1. Oxygen 
  2. Nitrogen 
  3. Carbon Dioxide 
  4. Hydrogen 
Identify the gas
  1. Nitrogen
  2. Oxygen
  3. Carbon Dioxide
  4. Water vapours
Which component of the air is used in fire extinguishers ? 
  1. Oxygen 
  2. Nitrogen 
  3. Carbon-di-oxide 
  4. Argon 
Name the object which is inflated by air 
  1. Table 
  2. Chair 
  3. Balloons 
  4. Buckets 
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