Physics (AS & A Level) · May / June 2025 · Paper 14 · Question 3

Calipers are used to determine the thickness of the wall of a glass tube. The following measurements are made. internal diameter of the tube = (10.0 ± 0.1) mm external diameter of the tube = (12.0 ± 0.1) mm What is the thickness of the wall of the tube?

1. A(1.0 ± 0.1) mm
2. B(1.0 ± 0.2) mm
3. C(2.0 ± 0.1) mm
4. D(2.0 ± 0.2) mm

As printed in the paper