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Class 9th Computer Science Model Question Paper – 2080

 Group A 1. Answer the following questions in one sentence:     (6x1=6) a) List any two features of a computer system. b) Why are…

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Paper Chromatography: Separate Dyes & Determine Rf Values

THEORY: Chromatography is a simple technique of separating micro-quantities of substances in…

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Detecting Oxygen in Air: Presence & Percentage by Volume

THEORY: Burning is one of the most familiar examples of chemical changes.…

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How to Demonstrate the Presence of Carbon Dioxide in Air

THEORY: The presence of carbon dioxide in air can be shown by…

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How to Demonstrate the Presence of Water Vapor in Air

METHOD 1 THEORY: The presence of moisture or water vapour in air…

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