Class X

Atmosphere is divided in to
  1. 2 layers
  2. 3 layers
  3. 1 layer
  4. 4 layers
Amount of Nitrogen (N2) present in dry air is
  1. 20%
  2. 78%
  3. 48%
  4. 68%
Ozone (O?) comprises of
  1. one oxygen atom
  2. 2 oxygen atoms
  3. 3 oxygen atoms
  4. 4 oxygen atoms
Thermosphere is situated above
  1. 12 km
  2. 50 km
  3. 80 km
  4. 10 km
When ozone absorbs UV radiation, energy is converted in to
  1. light
  2. sound
  3. heat
  4. electricity
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