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1 a, 2 d, 3 b, 4 d, 5 a
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1.Ans. (b) Linear expansion.
2.Ans. (a) Thermal expansion.
3.Ans. (b) Expansion of rails during summer.
4.Ans. (a) Brass on the outer surface.
5.Ans. (d) Both (b) and (c).
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