(1): when a liquid in a container is heated first the level of the liquid falls down and then rises .
(2): when the liquid in a container is heated first the container undergoes expansion and generally, the expansion of the liquid is greater than that of solid.

Both 1 and 2 are true and 2 is the correct explanation of 1

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Both 1 & 2 are true but 2 is not the correct explanation of 1.

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1 is true but 2 is false

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1 is false but 2 is true

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Solution

The correct option is A Both 1 and 2 are true and 2 is the correct explanation of 1
The heating becomes from heating the container. When initially heat is given, the container begins to expand. Until the heat reaches the liquid, the container expansion results in decrease in level of liquid.
Once the heat starts reaching the liquid, the liquid expands more than the vessel and thus the level increases then.

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(1): when a liquid in a container is heated first the level of the liquid falls down and then rises . (2): when the liquid in a container is heated first the container undergoes expansion and generally, the expansion of the liquid is greater than that of solid.

(1): when a liquid in a container is heated first the level of the liquid falls down and then rises .
(2): when the liquid in a container is heated first the container undergoes expansion and generally, the expansion of the liquid is greater than that of solid.