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What is moveable pulley?

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Describe the image formationn by concave mirror.

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How does innner ear works?

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Compare the regular and diffuse reflection.

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Write two uses of periscope.

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What is kinetic energy?

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How were asteroids formed?

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Why pulleys are used?

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What do you know about the person who first entered the space?

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Define meteoroid?

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What do you know about Ceres and Vesta?

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Prove that water is a universal solvent?

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How does sound produced? Explain.

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Give the structure of pin-hole camera?

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Compare charactersitics of the images formed by a plane mirror and a pinho;le camera

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Why does sodium form a chemical bond with chlorine?

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What is an element .Also give example?

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What are the uses of convex mirror?

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Describe the funtions of gear systems.

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How can sound be harmful and helpful?

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