You should avoid holding a thermometer by the bulb because it can lead to an inaccurate temperature reading. The heat from your hand can affect the thermometer’s reading, causing it to show a higher temperature than the actual one. Additionally, holding the bulb can damage the thermometer, especially if it is made of glass. To get the most accurate reading, it is best to hold the thermometer by the stem and ensure the bulb is properly immersed in the liquid or object being measured.

This question related to Chapter 7 Science Curiosity Class 6th NCERT.
From the Chapter 7. Temperature and its Measurement.
Give answer according to your understanding.