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Give the structure of pin-hole camera?

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Write the name of parts of comet

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Define a mirror?

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What is microscope and how it works?

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How covering the ears can keep a person from hearing a sound?

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How does innner ear works?

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What is satellite receiving station?

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How were asteroids formed?

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What are the uses of convex mirror?

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Write two uses of periscope.

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How sound traveks in air?

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Define reflection?

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What happens when a comet comes near the sun?

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What is regular reflection?

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What are heavenly bodies?

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What are the types of reflecting surface?

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Name the first two men who stepped on the moon?

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Why sound energy needs a medium?

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Define meteoroid?

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What do you know about Ceres and Vesta?

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