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WorksheetsLesson 15 Air Around Us
Total questions: 15
Worksheet time: 4mins
What are the properties of air?
Air occupies space.
Air conducts electricity.
Air has no colour and one can see through it.
Air (oxygen) does not support burning.
What is the formula of nitrogen?
N₂
H₂O
O₂
SO₂
____+____= CO₂
N₂F₂ + O₂
CF₂N₂ + SiH₂F
O₂ + C₂
C + O₂
Which of the following are flammable?
Water Vapour
Helium
Hydrogen
Oxygen
What is the percentage of oxygen in air?
21%
78%
99%
1%
Air is
a opaque object
a pure substance
a mixture
anything, that depends on the place where it is found
This air pollution causes various problems including _____ and _____.
smog
Plastic rain
acid rain
Voog
Draw a picture of that part of the plant which exchange oxygen and carbon dioxide from air?
Envelope of air that surrounds the earth is known as
biosphere
ecosystem
environment
atmosphere
O₂ is a supporter of
Rusting
combustion
smoke
dust
The formula for (a) is CO₂
The importance of nitrogen is__________.
All the living things need nitrogen compounds for their growth. The humans use nitrogen gas of the air to make proteins.
All the living things need nitrogen compounds for their growth. The animals use nitrogen gas of the air to make proteins.
All the living things need nitrogen compounds for their growth. The plants use nitrogen gas of the air to make calcium.
All the living things need nitrogen compounds for their growth. The plants use nitrogen gas of the air to make proteins.
Since the late ____s, air power has also been used to generate electricity.
1800
1900
1700
2000
The formula to write (a) is Ar.
__________ is an important _____ gas that helps to trap heat in our atmosphere. Without it, our planet would be inhospitably cold.
Oxygen, Greenhouse
Carbon dioxide, Natural
Argon, Natural
Carbon dioxide, Greenhouse
