One should read the thermometer by keeping the level of mercury along the line of sight, in order to avoid________.

damage to our eyes

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parallax error

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tilting of our head

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fall of mercury level

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Solution

The correct option is B
parallax error

Parallax error is a displacement or difference in the apparent position of an object when viewed along two different lines of sight. To avoid parallax error, it is always advised to make record thermometer measurements along the line of sight or eye level.

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