Physics 2007 JAMB Past Questions - Question 31: Use a liquid with a high melting point. II. Use a liquid of high volume expansivity. III. Use a capillary tube of large diameter. Which of the above best describes how the sensitivity of a liquid-in-glass thermometer can be enhanced?

Correct Answer

B

Explanation

Using a liquid of high volume expansively II onlyThe sensitivity of a liquid-in-glass thermometer can be enhanced by using a liquid with a high volume expansivity, which is option II.

1. Using a liquid with a high melting point (option I) may not necessarily enhance sensitivity, as it primarily affects the upper temperature limit of the thermometer but doesn't directly impact sensitivity.

2. Using a liquid with high volume expansivity (option II) is crucial because it means the liquid will expand or contract significantly with changes in temperature. This expansion or contraction results in noticeable movements of the liquid in the thermometer, making it more sensitive to temperature changes.

3. Using a capillary tube of large diameter (option III) typically doesn't enhance sensitivity. In fact, a smaller capillary tube may offer better sensitivity as it allows for more precise measurement of the liquid's movement.

So, option II, using a liquid with high volume expansivity, is the best choice for enhancing the sensitivity of a liquid-in-glass thermometer.