Class VI

A gas is colourless, odourless, heavier than air and extinguishes fire. Name the gas?
  1. Nitrogen
  2. Carbon Dioxide
  3. Hydrogen
  4. Oxygen
Which gas present in atmosphere allows substances to burn?
  1. Nitrogen
  2. Carbon Dioxide
  3. Oxygen
  4. Ozone
Clothes dry faster when there is ______ water vapour in air
  1. less
  2. more
  3. either less or more
  4. none of these
Which one of the following statement is TRUE?
  1. Air is opaque.
  2. Air is made of one substance only.
  3. Air contains water vapour.
  4. Air contains large amount of inert gases.
Removal of water from plant bodies in the form of vapours is called _______.
  1. Photosynthesis
  2. Respiration
  3. Transpiration
  4. Condensation
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