Class VI

The burning of fuel produces harmful 
  1. Smog 
  2. Fog 
  3. Nitrogen 
  4. Smoke 
A gas is colourless, odourless, heavier than air and extiguishes fire . Name the gas ? 
  1. Nitrogen 
  2. Carbon Dioxide 
  3. Hydrogen 
  4. Oxygen 
Which one of the following has the major part in air?
  1. Nitrogen
  2. Oxygen
  3. Carbon Dioxide
  4. Helium
Wind blows at a very high speed under which of these conditions? 
  1. Storm 
  2. Winter 
  3. Summer 
  4. Monsoon 
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 . 
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