Question
Question: When the jaw of vernier callipers are in contact the zero of the vernier scale lies left of the firs...
When the jaw of vernier callipers are in contact the zero of the vernier scale lies left of the first division of the main scale and fourth division coincides with main scale. The minimum reading which this instrument can give is 0.01 cm. A cylinder's diameter is measured by this then it reads 1 cm on the main scale and 5th division of the vernier coincides with the 15th division of the main scale. The radius is –
A
(a) 10.1mm
A
(b) 10.15 mm
A
(c) 5.075 mm
A
(d) 5.050 mm
Explanation
Solution
(d)
Sol. LC = 0.1 mm
MSR = 1 cm = 10 mm
VCR = 5 × 0.1 = 0.5 cm
l = 4 × 0.1 = 0.4 cm
2r = 10 + 0.5 – 0.4 = 10.1 mm
r = 5.05 mm