Physics 2017 JAMB Past Questions - Question 19: The inner diameter of a small test tube can be measured accurately using a

Correct Answer

B

Explanation

micrometer or a caliper. Both tools are commonly used for measuring the dimensions of small objects with high precision. To measure the inner diameter of a small test tube, you can follow these steps:

1. Ensure that the test tube is clean and free from any debris or substances that may affect the measurement accuracy.

2. Open the micrometer or caliper and set it to the appropriate measurement range. Make sure it is set to measure the inner diameter.

3. Gently insert the measuring jaws of the micrometer or caliper into the test tube until they make contact with the inner walls.

4. Close the jaws of the measuring tool until they firmly grip the inner walls of the test tube. Be careful not to apply excessive force that could damage the test tube.

5. Read the measurement value displayed on the micrometer or caliper. This value represents the inner diameter of the test tube.

6. Repeat the measurement a few times to ensure accuracy and take the average of the readings for a more precise result.

Remember to handle the test tube and measuring tools with care to avoid any damage or inaccuracies in the measurement.