Question

For each of the two vernier callipers P and Q, 1 MSD = 1mm. For P, 10 VSD = 8 MSD and for Q, 20 VSD = 15 MSD. The vernier callipers that gives more accurate reading is ____________.
A. P
B. Q
C. Both P and Q give equal accurancy.
D. Data insufficient.

Answer 1

Correct Answer - A
For P and Q 1 MSD = 1mm
For P 10 VSD = 8 MSD = 8 mm
1 VSD = 0.8 mm
` L.C = 1 MSD- 1 VSD = = 1-0.8= 0.2 mm`
`"For" Q 20 VSD = 15 MDS = 15mm` ltBrgt 1 VSD = 0.75 mm
L.C = 1 MSD - 1 VSD = 1 - 0.75 = 0.25 mm
L.c. of is less than Q. Therefore, the reading of P is more accurate than Q.