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Which surfaces are the bad emitters of radiation?

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What are the types of change?

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Write down few examples of plastic. Also state the shapes of plastics?

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Define liquid fertilizers?

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What the colours scheme of rainbow?

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Define refractive index and write its equation?

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State the harmful effect of improper use of fertilizers?

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Prove with the help of an experiment that water is a bad conductor of heat?

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What is meant by conduction?

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Write the use of plastic bags and paper bags?

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What do you know about margarine?

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What does a binocular uses to see distant objects?

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How plastic cause the pollution? Write the way to deal it?

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How can we obtain other colours?

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Define critical angle?

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Why convection is not possible in solids?

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Define the spectrum of light?

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What is thermal energy ?

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What is meant by total internal reflection?

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Why do we use periscope?

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