From the following, who was the first women speaker of Lok Sabha?
Sushma Swaraj
Margret Alva
Meera Kumar
Meera Kumar
Helium is added to the oxygen supply of deep sea divers because it is............
less poisonous than nitrogen
lighter than nitrogen
readily miscible with oxygen
readily miscible with oxygen
Why does ice covered in sawdust not melt quickly?
Sawdust does not allow the air to touch the ice
The water is absorbed by sawdust
Sawdust is a bad conductor of heat
Sawdust is a bad conductor of heat
SMOG is a combination of
Air and water vapour
Water and smoke
Fire and water
Fire and water
Why is Carbon Monoxide a pollutant?
Reacts with haemoglobin
Makes nervous system inactive
It reacts with Oxygen
It reacts with Oxygen
Chernobyl disaster is the result of pollution by
Oil spill
Acid rain
Carbon dioxide
Carbon dioxide
Which one of the following weeds is effective in controlling water pollution caused by industrial effluents?
Parthenium
Elephant grass
Water hycinth
Water hycinth
Activated Charcoal is used to remove colouring matter from pure substances by _____________
Bleaching
Oxidation
Adsorption
Adsorption