Class X

Layer which protects earth from being hit by meteoroids is
  1. Troposphere
  2. Mesosphere
  3. Thermosphere
  4. Stratosphere
Reformation of ozone in stratosphere is powered by
  1. UV radiation
  2. atmospheric oxygen
  3. sunlight
  4. heat
Temperature variation in stratosphere is about
  1. -5°C to 50°C
  2. 10°C to 20°C
  3. -5°C to -55°C
  4. -55°C to -5°C
Amount of Nitrogen (N2) present in dry air is
  1. 20%
  2. 78%
  3. 48%
  4. 68%
Compound which is responsible for acid rain is
  1. Sulfur
  2. Sulfur dioxide
  3. Sulfur trioxide
  4. nitrogen
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