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
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B
reading a wrong value
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C
any leakage of mercury
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D
the fall of the mercury level
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Solution
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.