Class X

Ozone gas (O3) has
  1. pleasant odor
  2. unpleasant odor
  3. no odor
  4. orange color
Gas responsible for global warming is
  1. oxygen
  2. carbon dioxide
  3. carbon monoxide
  4. oxygen
Thermosphere is situated above
  1. 12 km
  2. 50 km
  3. 80 km
  4. 10 km
At every 1 km increase in altitude, air gets about
  1. 10°C cooler
  2. 6.5°C hotter
  3. 6.5°C cooler
  4. 20°C cooler
Amount of Nitrogen (N2) present in dry air is
  1. 20%
  2. 78%
  3. 48%
  4. 68%
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