Question

One should read a thermometer by keeping the level of its mercury along one's line of sight, in order to avoid ________.

• A. any damage to eyes
• B. reading a wrong value
• C. any leakage of mercury
• D. the fall of the mercury level

Answer 1

The correct option is B reading a wrong value

When a person does not read a thermometer by keeping the level of the mercury along his/her line of sight, there is a high possibility for him/her to observe or read a wrong value. To avoid this error, it is always advisable to record a thermometer's measurements, while keeping the mercury level parallel to the eye level.