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- 1. Multiple Choice
Oxygen percentage in Earth is.......
21%
78%
1%
- 2. Multiple Choice
Manganese dioxide is.........
Making oxidation
Making combustion
A catalyst
- 3. Multiple Choice
Ozon layer is a layer consist of.....
1 atom of oxygen
2 atoms of oxygen
3 atoms of oxygen
- 4. Multiple Choice
We can use oxygen for mechanical ventilation in hospitals
True
False
- 5. Multiple Choice
Iron rusting is an example for......
Combustion
Preparing oxygen in laboratory
Oxidation
- 6. Multiple Choice
.................... is saving the oxygen percentage in Earth
Oxygen tanks
Photosynthesis process
Respiration system
- 7. Multiple Choice
Oxygen is colorless gas
True
False
- 8. Multiple Choice
The mass of burned object is............. the object before burning
Less than
Greater than
Equal
- 9. Multiple Choice
Divers are using ...........
Oxygen cylinder
Ozone
Nitrogen
- 10. Multiple Choice
Photosynthesis needs
Sun, oxygen, water
Sun, carbon dioxide, water
Sun, food, water
- 11. Multiple Choice
Oxygen can't help in burning
True
False
- 12. Multiple Choice
The atmosphere consists of
Oxygen
Carbon dioxide
Nitrogen
All of the above
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