Question : Removal of carbon particles from air involves the principles of

Option 1: Precipitation

Option 2: Filtration

Option 3: Electrophoresis

Option 4: Sedimentation

Question : The antiparticle of an electron is

Option 1: Positron

Option 2: Proton

Option 3: Alpha particles

Option 4: Beta particles

Question : The major constituent of air is

Option 1: Nitrogen

Option 2: Carbon dioxide

Option 3: Oxygen

Option 4: Hydrogen

Question : The major harmful gas emitted by automobile vehicle which causes air pollution is

Option 1: Carbon monoxide

Option 2: Methane

Option 3: Carbon dioxide

Option 4: Ozone gas

Question : Which of the following is most important for absorption of heat radiated from the Sun as well as from the Earth?

Option 1: Carbon dioxide

Option 2: Oxygen

Option 3: Carbon monoxide

Option 4: Nitrogen

Question : Which of the following gases is most toxic ?

Option 1: Carbon dioxide

Option 2: Carbon monoxide

Option 3: Sulphur dioxide

Option 4: Chlorine