Multiple choice

In a cup, tea cools from 90 degree Celsius to 80 degree Celsius in exactly 1 minute. It will cool from 70 degree Celsius to 60 degree Celsius in

  1. less than one minute

  2. exactly one minute

  3. nearly one minute

  4. more than one minute
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The time required to cool down a liquid is directly proportional to the heat to be extracted. The evaporation produces cooling effect. More is the evaporation rate, more easily the liquid becomes cool.

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