Discussion
Assertion (A) : A little gap is left between iron rails.
Reason (R) : Iron expands in summer.
Answer: A
Correct answer: Both A and R are true and R is the correct explanation of A.
Iron expands when heated, so rails laid tight in cool weather would buckle on a hot day. The gap left between lengths gives the metal room to expand, which is exactly why it is there. Both are true and R explains A.
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