The process of coating an iron with zinc is called
Galvanizing
Elector plating
Nitrating
Leaching
Co2 gas is
Lighter than air
Heavier than air
Neither lighter nor heavier
None of these
Which is used in welding?
Oxy-hydrogen
Oxy chlorine
Oxy nitrogen
Ox y fluorine
Which air pollutant is not released by the automobiles?.
So2
Co
Fly ash
Hydrocarbon
The region closest to earth surface is
Stratosphere
Mesosphere
Thermosphere
Troposphere
Automobiles can reduce the carbon monoxide and other pollutant by the installation of
Tyres
Horns
Double Seats
Catalytic converter
The inert gas used in weather balloon is
He
Rn
Kr
Ar
Green house effect is caused by
U.V Rays
I.R rays
X-rays
R-rays
