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

any damage to eyes

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reading a wrong value

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any leakage of mercury

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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.

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