Assertion :While laying railway tracks, a small gap is left between adjacent rails.The iron rails expand in summer, and the gap allows space for the expansion. Reason: Because substance show contraction on heating and expansion on cooling

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
In summer, when the atmospheric temperature is very high, solid iron tracks expand thus filling the gap, left between two adjacent tracks. This gap avoids the bending of adjacent tracks. This is thermal expansion of solids. Therefore, substance shows expansion on heating and contraction on cooling.
The assertion is correct but reason is incorrect.

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