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प्रश्न
Make sentences using the given set of words.
99%, oxygen, nitrogen, air, together
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उत्तर
Nitrogen and oxygen together make up 99% of the air.
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संबंधित प्रश्न
Tick (√ ) the most appropriate answer.
Magnesium burns with a dazzling white flame to form magnesium oxide, a powdery mass. The colour of magnesium oxide is :
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The composition of air was discovered by Lavoisier.
Name the following:
An inert gas which has a low boiling point and is used for producing very low temperatures
State whether the following statement is ‘true’ or ‘false’. If false write the correct statement.
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The Scottish chemist ______ discovered carbon dioxide is present in air.
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| 2. | Coastal areas | b. | Humidity |
| 3. | Rainy season | c. | Carbon dioxide |
| 4. | Windy places | d. | water vapour |
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State whether the following statement is true or false. If false, correct them.
Air helps in the movements of sailing yachts and gliders but plays no role in the flight of birds and aeroplanes.
A list of words is given in a box. Use appropriate words to fill up the blank in the following statement.
A weather cock shows the ______ in which the air is moving at that place.
Observe the picture given in figure carefully and answer the following questions.
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- Can you comment on air quality of the place shown in the figure?
