Question

why the bulb of thermometer should not touch the sides of beaker

Answer 1

It's important to not touch the sides of the test tube with the thermometer because touching it to the sides of the test tube fractures the glass and does not  allow for correct temperature measurements.
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Answer 2

Explanation:

The thermometer should not touch the sides or the base of the container as the container may not have the same temperature as the solution (especially if the container is not a very good conductor of heat). Thus, having the thermometer touch the container may give an inaccurate reading.