Which of the following statements is true for a thermometer?

Coefficient of cubical expansion of liquid must be greater than that of bulb material

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Coefficient of cubical expansion of liquid may be equal to that of bulb material

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Coefficient of cubical expansion of liquid must be less than of bulb material

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None of the above

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Solution

The correct option is A Coefficient of cubical expansion of liquid must be greater than that of bulb material
During the heat transfer from a body to the thermometer, the bulb and the liquid in the thermometer both expand. The expansion of the liquid must be greater than that of the bulb because the liquid has to rise in the capillary tube.
Therefore, the coefficient of cubical expansion of the liquid must be greater than that of the bulb material.
The correct option is A.

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