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प्रश्न
Observe the picture given in Fig. carefully and answer the following questions.
What is covering the nose and mouth of the police man?
उत्तर
A mask is covering his nose and mouth.
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संबंधित प्रश्न
Suggest five measures to prevent air pollution.
What is nitrogen-fixation?
Name the main components of air.
Classify Calcium oxide. Also give a balanced equation to prepare it.
Fill in the blank
The supporter of combustion in air is _____.
Explain the importance of nitrogen of the air for plant growth.
“Air is not an elementary substance, but a composition”. Why?
Nitrogen gas is so cold that moisture in the air condenses on it, creating a dense fog.
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.
(i) Bubbles of air came out from the bottle.
(ii) Some water entered the bottle.
(iii) Nitrogen gas came out in the form of bubbles and oxygen got dissolved in water.
(iv) 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 airplanes.
