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How does sound travel? Explain.

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Explain the principle of reflection in a kaleidoscope?

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Explain with the help of experiment that which transmits sound more efficiently ,air or water?

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Investigate the image formation by convex and concave mirrors?

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Describe image formation by a plane mirror.

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Write a note on orbits of artificial satelites?

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What happens when light falls on the surface of non-luminous objects?

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Expalin that how do satellites tell us where we are.

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Design a activity to make an optical instrument using mirror?

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Describe the uses of various satellites in space.

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

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What is meant by heat energy?

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How a saturated solution is formed?

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What do you know about gold?

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What is "block and tackle"?

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Why things don't sink in " Dead Sea"?

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What is moveable pulley?

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What do you know about gear?

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How compound machines are different from simple machines?

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Define law of conservation of enrgy

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