_____________ present in air is a supporter of combustion .
Nitrogen
Carbon dioxide
Argon
Oxygen
___________ is used on stage to produce the effect of clouds.
Carbondioxide gas
Solid carbon dioxide
Liquid ammonia
Liquid Oxygen
Carbon dioxide gas
________ is a chemical based product.
Super conductors
Energy
Matter
Fuel
A generalized trend of observation made on a system is called
Hypothesis
Theory
Law
Concept
---------is a form of knowledge gained by careful observation and experimentation.
Science
Political Science
Social science
Physical science.
The air we breathe out is called ____________ air.
Liquefied
Exhaled
Inhaled
Gaseous
_____________ is produced from respiration by animals and human beings, burning of fuels etc.
Noble gases
Air can be liquefied by cooling under
Low pressure
High pressure
Atmospheric pressure
High temperature
_________ is the process in which the bubbles formed in a liquid when heated reach the surface and burst, and allow the vapour to escape into the atmosphere.
Dissolution
Evaporation
Boiling
Condensation.
