AIR AROUND US

Air contains__________ particles
1. dust
2. liquid
3. solid
4. no
Major part of air is constitued by
1. nitrogen
2. carbondioxide
3. oxygen
4. inert gases
Which of the following gas helps in burning?
1. nitrogen
2. oxygen
3. carbondioxide
4. carbonmonoxide
The components of air which are harmful to living beings
1. nitrogen and carbondioxide
2. dust and water vapour
3. dust and smoke
4. smoke and water vapour
What is the ratio of nitrogen to oxygen in air ?
1. 2:5
2. 4:1
3. 5:8
4. 2:4
Air is not present in which of the following?
1. space
2. water
3. atmosphere
4. empty glass
Wind doesnot help in movement in which of the following?
1. windmill
2. weather cock
3. ceiling fan
4. dispersal of seeds
There is ...... of oxygen at higher altitudes
1. availability
2. defficiency
3. non availability
4. excess availability
Which of the following doesnot require air?
1. rotate windmill
2. burn a candle
3. movement of ceiling fan
4. oxygen cycle
In take of oxygen and giving out oxygen is called
1. respiration
2. breathing
3. life cycle
4. oxygen cycle