State one harmful effect of ultraviolet rays.

Identify the greenhouse gas: (a) Oxygen (b) Hydrogen (c) Water vapour (d) Nitrogen

Which layer of atmosphere is susceptible to storm and rain?

Name the greenhouse gas discharged from a refrigerator

What is the unit of concentration of ozone layer?

Chlorine atom (Cl) destroys Ozone molecule (O3) - show with the help of a chemical reaction.

The major constituent of Biogas is (a) CH4 (b) CFC (c) CO2 (d) CO

The amount of which greenhouse gas in the atmosphere increases by the burning of fossil fuel?

What is meant by the calorific value of a sample of coal is 30,000 kJkg-1? OR Why can wind energy be used for sustainable growth development?

Name a gas present in the atmosphere which is not a greenhouse gas.

Which of the following gases helps in the depletion of ozone in the ozone layer? CO2 Ar CFCs He

Which type of energy is transformed to electrical energy in a dynamo?

What is the SI unit of calorific value of fuels?