Inert gases are not used in?
a) electric bulbs
b) sign boards
c) photosynthesis
d) weather balloons
Which gas in air is necessary for burning process?
a) oxygen
b) nitrogen
c) carbon dioxide
d) argon
…is necessary in process of burning of wood.
PST ---P-1----18L
a) Air
b) Terpene oil
c) Fuel
d) oil
A greenhouse gas that absorbs energy and maintains earth
temperature is.
a) Carbon dioxide
b) Oxygen
c) Nitrogen
d) argon
Main constituent in air is …………………
a) Nitrogen
b) Oxygen
c) argon
d) Water vapor
On cooling, a liquid will be changed in to ……
a) Dense
b) Solid
c) Liquid
d) Semi-solid
