Question : What does the 'ozone layer' absorb?

Option 1: Infrared rays

Option 2: Ultraviolet rays

Option 3: X - rays

Option 4: Gamma - rays

Question : The maximum biological damage is produced by

Option 1: X-rays

Option 2: gamma-rays

Option 3: beta-rays

Option 4: alpha-rays

Question : Which of the following radiations has the least wavelength?

Option 1: X-rays

Option 2: α-rays

Option 3: γ-rays

Option 4: β-rays

Question : 'Greenhouse effect' means

Option 1: Cultivation of crops in a greenhouse to conserve heat

Option 2: Trapping of solar energy due to carbon dioxide gases

Option 3: Trapping of solar energy by the Earth's upper surface

Option 4: Increase of heat due to atmospheric pollution

Question : Magnetic keepers are used to protect magnets from:

Option 1: Earth's magnetic field

Option 2: effect of other magnets

Option 3: self-demagnetisation

Option 4: demagnetisation due to heating