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What are constellations?Also describe the importance of constellations.

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Write a short note on spiral and elliptical galaxies?

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Write the disadvantage of series circuits?

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What are the different ways to transfer heat?

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On which factors, the brightness of a star depends on? Explain them?

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Where optical fibres are used?

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

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Sound waves are longitudnal waves . Elaborate it.

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How does vegetables oil change into fat?Also write down its equation ?

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What is wave?Also describe different types of waves?

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What can happen to the light passing through prism?

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How fertilizers cause water pollution?

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Where frozen water is found?

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Shortly describe the transfer of heat in solids?

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Describe how periscope works by using the principal of total internal reflection?

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A good absorber of heat is a good radiator of heat. Prove it by an experiment.

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What is meant by manure?

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Describe harmful effects of improper use of fertilizers.

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What is vacuum flask?

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Define chemical fertilizers. How it is prepared?

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