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Name the main component of air.
Concept: undefined >> undefined
Very Short Answer Type Question:
Name the method by which we get salt from ocean water.
Concept: undefined >> undefined
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What is the source of oxygen gas in air?
Concept: undefined >> undefined
What is the percentage of nitrogen in air?
Concept: undefined >> undefined
Very Short Answer Type Question:
Define condensation.
Concept: undefined >> undefined
What is the percentage of oxygen in air?
Concept: undefined >> undefined
What is the source of carbon dioxide in air?
Concept: undefined >> undefined
Very Short Answer Type Question:
Write opposite process of evaporation.
Concept: undefined >> undefined
Mention one necessary condition for the combustion to take place.
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Short Answer Type Question:
What is mixture?
Concept: undefined >> undefined
Why is air considered as a mixture?
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Short Answer Type Question:
Write various methods of separation of components from their mixture.
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Short Answer Type Question:
Define the term handpicking.
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Short Answer Type Question:
What do you mean by threshing? Where is it used?
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Short Answer Type Question:
Write three methods of separation.
Concept: undefined >> undefined
What happens if the percentage of oxygen in the air reaches to 70%?
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What happens if the percentage of carbon-dioxide increases in the air?
Concept: undefined >> undefined
Why is carbon-dioxide gas used to extinguish fire?
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How will you prove that soil contains air in it?
Concept: undefined >> undefined
Why do we see the sky and air clear and clean after rainfall?
Concept: undefined >> undefined
