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Define melting, boiling and freezing.

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Explain water cycle in detail?

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Why the things contract on cooling?

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What is the importance of polar star?

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How do static charges build up?

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Write disadvantages of friction.

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Define load and effort?

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Explain electrical circuit and its component.

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Give the reason for friction between two surfaces

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The four actions which are only possible because of friction are:

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Why sunlight is important for plants?

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Venus is very similar to earth in size. Why it is unlikely to support life?

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How do solids differ from liquids with regard to particle arrangement?

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How air pollution effects humans?

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What do you know about first kind of lever?

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Compare the light wave with sound wave

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Name the gas which shields us from dangerous ultra-violet rays of the sun.

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Why is it difficult to compress any solid?

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How many types of rocks are there?

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Prove that light travels in a straight line?

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