Which of the following is not a valid precaution for using the clinical thermometer?
A
The reading should be initially below 35 deg C.
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B
Carefully hold the bulb while taking the reading.
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C
Proper line of sight for mercury to be maintained while taking reading.
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D
Should be washed before and after use.
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Solution
The correct option is B Carefully hold the bulb while taking the reading. Option - C is not a valid precaution, because we should not touch the bulb while taking the reading.