What may happen if you keep a clinical thermometer in direct sunlight?

Thermometer may break

The correct answer is option 2. Thermometer may break.

If a clinical thermometer is kept in direct sunlight, the mercury level in the thermometer may rise. This is because exposure to direct sunlight increases the temperature of the thermometer, causing the mercury inside to expand and move up the scale. However, this doesn't necessarily mean that the thermometer will break, become hard, or melt. It is essential to avoid exposing thermometers, especially those with mercury, to direct sunlight or heat sources to ensure accurate temperature readings and prevent damage to the thermometer.