AIR AROUND US

The gas produced during respiration and used by plants during photosynthesis is
1. nitrogen
2. oxygen
3. helium
4. carbondioxide
The gas that supports burning and is necessary for living organisms
1. carbondioxide
2. nitrogen
3. oxygen
4. inert gases
Used for drawing water from tube wells and run flour mills
1. windmill
2. watermill
3. weather cock
4. watermotor
We feel suffocated in a closed room due to presence of
1. carbondioxide
2. oxygen
3. nitrogen
4. inert gases
Ozone provides a blanket in atmosphere which protects us from
1. dirt
2. smoke
3. UV rays
4. heat strokes
A chemical process which generates energy in the body
1. breathing
2. oxygen cycle
3. respiration
4. digestion
What will happen if level of oxygen in air increases?
1. better living
2. no one will be able to breathe
3. combustion
4. there will be no smoke
When air comes in contact with a cool surface,it gets cooled and fog appears called
1. smoke
2. water vapour
3. water
4. liquid
The content of water vapour present in the air is called
1. humidiy
2. fog
3. liquid
4. water content
What will happen if nitrogen disappears from the atmosphere?
1. no life
2. things will burn fast
3. plants will not be able to make food
4. no one will be able to breathe