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 dose not play any role in rising up the balloon . 
  4. Hot air contains water vapours which push up the balloon . 
Which of the following components of air is present in the largest amount in the atmosphere ? 
  1. Nitrogen 
  2. Oxygen 
  3. Water vapour 
  4. Carbon dioxide 
A gas is colourless, odourless, heavier than air and extiguishes fire . Name the gas ? 
  1. Nitrogen 
  2. Carbon Dioxide 
  3. Hydrogen 
  4. Oxygen 
The blanket of gases that surrounds the earth is called _ . 
  1. Air 
  2. Atmosphere 
  3. Lithosphere 
  4. Biospehere 
A gas is colourless, odourless, heavier than air and extinguishes fire. Name the gas?
  1. Nitrogen
  2. Carbon Dioxide
  3. Hydrogen
  4. Oxygen
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