In modern thermometer, mercury is used as it is a __________ liquid.

Viscous

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Heavy

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Reflective

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None of these

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Solution

The correct option is C Reflective
In modern thermometer, mercury is used as it is a reflective liquid. It is bright and opaque, so it’s easy to see movement of mercury inside the capillary tube and to read accurately. Even mercury does not wet the glass. So, if temperature is falling then you do not get inaccurate readings. It is also good conductor of heat. So, it reacts quickly to change in temperature.

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Which of the following is not a reason for using mercury as a liquid for thermometer?

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