Question

Statement I: One should hold the lab thermometer vertically upright in order to measure the temperature of liquid correctly.
Statement II: The bulb of the lab thermometer should touch the bottom of the container containing the liquid while measuring the temperature.

• A. Statement I is incorrect and statement II is correct.
  
• B. Statement I is correct and statement II is incorrect.
• C. Both statements are correct.
• D. Both statements are incorrect.

Answer 1

The correct option is B Statement I is correct and statement II is incorrect.

The correct steps to use a lab thermometer are as follows:
1. Take the liquid in a beaker.
2. Dip the thermometer in liquid so that the bulb is immersed in liquid but does not touch the bottom or side of the beaker.
3. Hold the thermometer vertically upright, wait till the mercury in the capillary tube becomes steady. Note the reading. That is the temperature of the liquid at that time.
Therefore, statement I is correct and statement II is incorrect.