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प्रश्न
Name the following:
An inert gas which has a low boiling point and is used for producing very low temperatures
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उत्तर
Helium
संबंधित प्रश्न
Write ‘true’ or ‘false for the following;
Carbon dioxide is given out during photosynthesis
State what would happen, if the air above the earth contained mainly oxygen and no nitrogen
Complete the statement given below by filling in the blank with the correct word from the words given
___________is an example of a pollutant present in the air.
Name the following:
A process which removes carbon dioxide from the air.
Give word equation for the following conversion:
Nitrogen of the air to nitric oxide
Why is carbon-dioxide gas used to extinguish fire?
How do astronauts breathe when they go beyond the earth’s atmosphere?
What is the presence of harmful substance in the air called?
Boojho took an empty plastic bottle, turned it upside down and dipped its open mouth into a bucket filled with water. He then tilted the bottle slightly and made the following observations.
- Bubbles of air came out from the bottle.
- Some water entered the bottle.
- Nitrogen gas came out in the form of bubbles and oxygen got dissolved in water.
- No bubbles formed, only water entered the bottle.
Which observations is/are correct?
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.
