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प्रश्न
Briefly state the importance of Oxygen.
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उत्तर
Oxygen in the air is essential for respiration and burning.
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संबंधित प्रश्न
State three uses of water vapour in the air.
Statement given below is incorrect. Write the correct statement :
Carbon dioxide gas allows the earth to radiate out heat rapidly.
Write ‘True’ or ‘False’ in front of following statement.
The area where a lot of fuel burns has more percentage of carbon dioxide.
Tick (√) the most appropriate answer.
The humans pollute the air by :
Statement given below is incorrect. Write the correct statement :
Potassium nitrate on strong heating decomposes into potassium nitrite and nitrogen gas.
The diagrams below represents an experiment to show the presence of a component of air.
- State why air is sucked from – outlet ‘B’ and not from outlet “A”
- State why the air is sucked ‘slowly’ from the outlet “B”
- State the observation seen after completion of the experiment.
- State the reason for the above observation seen.
- Name another component which if present in air as a pollutant would have given a similar observation
_____ gas turns lime water milky.
Match the following
| 1. | Moving Air | Photosynthesis |
| 2. | Layer in which we live | Troposphere |
| 3. | Stratosphere | Wind |
| 4. | Oxygen | Ozone layer |
| 5. | carbon-di-oxide | Combustion |
What is not true about air?
Write just a few sentences for an imaginary situation if any of the following gases disappear from the atmosphere.
Carbon dioxide
