Small gaps are left between the lengths of steel rail on a railway track in order to

let rainwater drain awayCorrect answerYour answerreduce the weight of the trackCorrect answerYour answerallow the rails to expand in hot weather without bendingCorrect answerYour answermake the wheels click so that the driver can judge speedCorrect answerYour answer

Show the answer and explanation

CorrectNot quiteAnswer C

Correct answer: C

Solids expand when heated. A long steel rail can grow by several millimetres on a hot day.
Without gaps, the expanding rails would push on each other and buckle.

Concept: Thermal expansion of solids
Typical timeTypical: 60 s
Your timeYours: —

The rule this testsHeat and temperature

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Small gaps are left between the lengths of steel rail on a railway track in order to

Explanation