Assertion : If the distance between parallel plates of a capacitor is halved and dielectric constant is three times, then the capacitance becomes $6\,times$.
Reason : Capacity of the capacitor does not depend upon the nature of the material.
AIIMS 1997, Easy
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We know that capacity of capacitor is directly proportional to dielectric constant and inversely proportional to distance. So, the net effect of making distance halved and making dielectric constant three times will be capacity becoming six times. As nature of the material (dielectric constant) is a factor influencing the capacity, therefore, Reason is incorrect.
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