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What are the trickiest question is asked in an interview?

This was asked in the UPSC civil services interview. The candidate was of engineering background.
Why does milk overflow when boiled while water does not?
This was asked in the UPSC civil services interview. The candidate was of engineering background.
His answer was, When milk is boiled, the water/moisture in it becomes vapour. But it is trapped under the top creamy layer of milk. So, the vapour tries to push out, spilling out the milk. In case of boiling water, vapour freely evaporates.
That's spot on.
He became an IPS officer. He mentioned this in his success story in the newspaper, adding that he was surprised by the question.

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