Explain the following:

A glass stopper stuck in the neck of a bottle can be removed by pouring hot water on the neck of the bottle.

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Solution

Hot water is poured on the neck of the bottle while removing a glass stopper stuck in the neck of a bottle. On pouring hot water on the neck of the bottle, the neck expands and glass stopper in it gets space to loosen and makes it easy to remove the stopper.

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Explain the following:

(a) The telephone wires break in winter.

(b) Iron rims are heated before they are fixed on the wooden wheels.

(d) A glass stopper stuck in the neck of a bottle can be removed by pouring hot water on the neck of the bottle.

(e) A cement floor is laid in small pieces with gaps in between.

Explain the following : 1.telephone wires sag in summer

2.iron rims are heated before they are fixed on wooden wheels

3. The are left between the successive rails on a railway track

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5. A glass stopper stuck in the neck of a bottle can be removed by pouring hot water on the neck of the bottle

The internal diameter of the neck of the water bottle can be measured by

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