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प्रश्न
Explain the following observations very briefly
An empty glass in fact is not empty.
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उत्तर
In an empty glass there is always air present which covers up the space therefore, it cannot be said empty. Air is transparent, weightless and doesn’t have a definite shape or volume, thus, we cannot see it.
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संबंधित प्रश्न
Briefly state the importance of Water vapour.
Fill in the blank
Green plants need ________________to prepare food.
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
State whether the following statement is ‘true’ or ‘false’. If false write the correct statement.
Photosynthesis is a process by which green plants prepare their own food in the presence of sunlight and chlorophyll.
What happens if the percentage of oxygen in the air reaches to 70%?
The constituent of air that supports combustion is _____.
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 |
Solvay process is a method to manufacture
“Air is not an elementary substance, but a composition”. Why?
Make sentences using the given set of words.
99%, oxygen, nitrogen, air, together
