Question

The internal and external diameters of a hollow cylinder are measured with the help of a Vernier callipers . Their values are `4.23 +- 0.01 cm and 3.87 +- 0.01 cm`, respectively . The thickness of the wall of the cylinder is
A. `(0.34 +- 0.02)cm`
B. `(0.17 +- 0.02)cm`
C. `(0.17 +- 0.01)cm`
D. `(0.34 +- 0.01)cm`

Answer 1

Correct Answer - c
`D = (4.23 +- 0.01)cm`
`d = (3.89 +- 0.01)cm`
`Delta t =(D - d)2 = [(4.23 +- 0.01) - (3.89 +- 0.01)//2`
`= [(4.23 - 3.89 +- (0.01 + 0.01)//2`
`= (0.34 +- 0.02 )]//2cm = (0.17 +- 0.01) cm`