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Which is the hardest matter on earth?

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Design a activity to make an optical instrument using mirror?

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What is microscope and how it works?

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Draw ray diagrams for light reflected from a plane mirror at different angles of incidence?

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How smog is produced?

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What do you know about German silver?

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Why sound energy needs a medium?

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Expalin how abiotic factors affect the ability of plants to create their own food.

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Explain the properties and uses of nitrogen gas in air?

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How carbon dioxide gas is important?

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Can the components of a mixture be easily seprated?

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What is a symbol?

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Give three states in which elements exist?

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Give some uses of rare gases?

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Differentiate between prey and predator.Also give example?

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What is homogenous mixture?

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What are abiotic components of environment?Explain.

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Define reflection?

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Describe various techniques to separate mixtures.

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Write a note on orbits of artificial satelites?

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