Click the correct answer (True or False).
Click the correct answer.
Which of the following gases is not a component of air?
Oxygen
Sulphur
Nitrogen
Carbon dioxide
Which of the following is used as a refrigerant?
Nitrogen
Sulphur
Water vapour
Carbon dioxide
How is water vapour formed?
Due to boiling
Due to evaporation
Due to boiling and evaporation
Due to melting
What are the by-products of respiration?
Carbon dioxide and water
Oxygen and water
Nitrogen and carbon dioxide
Oxygen and nitrogen
Which of the following is/are not the cause(s) of air pollution?
Burning of fossil fuels
Emissions from vehicles
Release of chemicals by industries and factories
Planting trees
Click the correct answer.
Air is a
of gases.
Mixture
Ball
Balloon
Blanket
The chemist who proved that air is a mixture of gases was
.
Dalton
Lavoisier
Bohr
Chadwick
The level of
in the atmosphere also plays a role in determining the global temperature.
oxygen
carbon dioxide
nitrogen
hydrogen
is widely used as a cooking fuel and to keep warm.
Dry wood
Charcoal
Dry ice
Oxygen
Chlorophyll is a
pigment.
green-coloured
brown-coloured
red-coloured
black-coloured
is an example of natural pollution source.
Oceans
Trees
Volcanoes
Vehicles
results in reduced fertility of the soil.
Rainfall
Drought
Flood
Acid rain
