When the flask is heated the liquid level at A falls slightly before it rises; this is because the ............... expands first.

Flask

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bowl

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cup

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saucer

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Solution

The correct option is A Flask
This is because the glass gets hot first and so expands and the volume of the beaker therefore increases. This means that the water level will drop. Then the water starts getting hotter, it expands more than the glass and so the water level rises.Hence, Option A is correct. The rest of the options do not express this condition, hence incorrect.

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