A generalized trend of observation made on a system is called
Hypothesis
Theory
Law
Concept
___________ is used on stage to produce the effect of clouds.
Carbon dioxide gas
Solid carbon dioxide
Liquid ammonia
Liquid Oxygen
Carbondioxide gas
___________ is also called internal respiration.
Respiration
Breathing
Cellular respiration
Burning
Air can be liquefied by cooling under
Low pressure
High pressure
Atmospheric pressure
High temperature
The air we breathe out is called ____________ air.
Liquefied
Exhaled
Inhaled
Gaseous
_________ 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.
______________ is the process in which a substance combines chemically with oxygen with simultaneous evolution of heat and light.
Reduction
Combustion
Rusting
Percentage by volume of oxygen in air is
78.1%
20.1%
0.03%
0.93%
____________ is used in aerated drinks.
Oxygen
Hydrogen
Carbon dioxide
Sulphur dioxide
