What is the SI unit of calorific value of fuels?

Write the name of a gas which increases atmospheric temperature. [1] OR Fill in the blank : [1] __ radiation, coming from the sun is prevented by the ozone layer from falling on the earth's surface.

Mention one fuel which is alternative to fossil fuel

Which layer of atmosphere has the greatest density? (a) Troposphere (b) Stratosphere (c) Mesosphere (d) Thermosphere

What is global warming?

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

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