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How do machines help us?

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In which form does light travel?

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Define lever?

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How fog is formed?

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Why does an ice cube melt at room temperature?

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What change will occur in the arrangement of particles of candles on burning it?

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Name the living things that can glow their bodies?

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What is the difference between dew and rain?

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How can we reduce friction?

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How parachutists make their landing safe?

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List down three examples of opaque objects?

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Define melting, boiling and freezing.

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How friction is reduced by using rollersn or wheels?

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Write the properties of gas particles.

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Write down some properties of light?

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On cooling the water, in which state it can be changed?

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

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List down three examples of non-luminous objects?

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Why is it easy to pour a liquid?

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Why are the shadow of the objects in open place formed in different directions at different times of the day?

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