Class VI

The layer of air around the earth is called 
  1. Atmosphere 
  2. Hydrosphere 
  3. Lithosphere 
  4. Stratosphere 
Which component of the air is used in fire extinguishers ? 
  1. Oxygen 
  2. Nitrogen 
  3. Carbon-di-oxide 
  4. Argon 
Air is 
  1. A mixture 
  2. A compound 
  3. An element 
  4. An electrolyte 
Which gas is taken by plants to prepare their food 
  1. Oxygen 
  2. Nitrogen 
  3. Carbon Dioxide 
  4. Hydrogen 
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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