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प्रश्न
Explain the following observations very briefly
The arrow of weather cock points towards a particular direction at a particular moment.
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उत्तर
A weather cock is an instrument which is used to indicate the direction in which air is moving. It consists of an arrow, mounted at its centre of gravity so it can move freely about a vertical axis.
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संबंधित प्रश्न
What is greenhouse effect?
What is wind?
Name two important processes supported by oxygen present in air.
Mention five causes of air pollution.
State four steps to be taken to control air pollution.
Tick (√) the correct alternative from the choice given for the following statement.
Respiration
Why is it said that-
Air is a homogeneous mixture of various gases.
Fill in the blank:
The gas evolved as a product of combustion as well as respiration is ______.
About 78% of the volume of air is ______.
State whether the following statement is true or false. If false, correct them.
Air does not occupy any space.
