Multiple choice

Water pipes in hilly areas often burst on a cold frosty night, because _____.

  1. the material of which pipes are made contracts due to cold and so breaks

  2. water in the pipes freezes and on freezing water expands, so pipes

  3. burst makes the pipes rusty, so they break

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Water expands when it freezes (unlike most materials). This expansion creates immense pressure inside pipes, causing them to burst. Pipes don't contract and break, nor does rust cause sudden bursting at night.

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