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What are luminous objects?

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What are the uses of concave lens?

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What do you know Comet Halley?

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How sound is important for whales and dolphins?

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What is pin-hole camera and who invented it?

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Define artificial satellite?

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What is a convex mirror?

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Could sound from a radio travel through aroom with no air? expalin.

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What is asteroid belt?

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What is plane mirror?

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Which planets have their own satellites?

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How can sound be harmful and helpful?

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How we see images in plane mirror?

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Why sound travel faster in solids ?

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How does sound produced? Explain.

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

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Prove that sound is a form of energy?

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Describe the image formationn by concave mirror.

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Compare the speed of sound in solids, liquids and gaseous mediums.

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Compare the regular and diffuse reflection.

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