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Why a small gap is left between the iron...

Why a small gap is left between the iron rails of railway tracks ?

A

gaps give the space to the tracks to expand in summer heat.

B

gaps hold the tracks firmly.

C

to produce gently rhythmic sound when the train moves on the track.

D

it is customary to level the gaps.

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The correct Answer is:
A
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MTG IIT JEE FOUNDATION-TEMPERATURE AND HEAT-EXERCISE (MULTIPLE CHOICE QUESTIONS)
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  2. We cannot use mercury thermometer at low temperatures because

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  10. When a substance changes its state from solid to liquid

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