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  4. Assertion Houses made of concrete roofs get very hot during summer days. Reason Thermal conductivity of concrete is much smaller than that of metal.

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Q. Assertion Houses made of concrete roofs get very hot during summer days.
Reason Thermal conductivity of concrete is much smaller than that of metal.

Thermal Properties of Matter

Solution:

Houses made of concrete roofs get very hot during summer days, because thermal conductivity of concrete (though much smaller than that of a metal) is still not small enough.
Therefore, Assertion and Reason are correct but Reason is not the correct explanation of Assertion.