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प्रश्न
How do astronauts breathe when they go beyond the earth’s atmosphere?
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उत्तर
It is because nitrogen tires hold pressure longer as compared to compressed air. Nitrogen gas in the tire escapes more slowly than compressed air does.
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संबंधित प्रश्न
What is air pollution ? What are the harmful effects of sulphur dioxide, nitrogen dioxide and hydrogen sulphide present in the air ?
Answer the question put against the following constituents of air :
Carbon dioxide : “Although carbon dioxide plays no role in respiration, all life would come to an end if there is no carbon dioxide in air.” Support this statement with relevant facts.
Name three noble gases present in the air. State their one industrial use
What are fuels?
Write ‘true’ or ‘false for the following;
The major component of air is oxygen.
Name the following:
The main, rare (inert) gas present in air.
Name the following:
The component of air which is present more in industrial areas.
Give word equation for the following conversion:
Nitrogen of the air to nitric oxide
Arrange the following statements in correct sequence
- Plants manufacture food by a process called photosynthesis.
- Plants require energy for their growth.
- Plants take in oxygen and release carbon dioxide just as animals.
- Plants take carbon dioxide from the atmosphere, use chlorophyll in the presence of sunlight and prepare food.
- Such oxygen is available to animals and human beings for breathing.
- During this process, oxygen is released by plants.
“Air is not an elementary substance, but a composition”. Why?
