Question

Find the zero error in figure given

• A. 0.3 mm
• B. -0.3 mm
• C. -0.7 mm
• D. 0.7 mm

Answer 1

The correct option is A 0.3 mm

Since, the zero of vernier scale is ahead of zero of main scale. So the error is positive zero error.

Least count of the vernier calliper $L.C.=0.1mm$

Since the $3rd$ division matches with the main scale division.

Zero error $=n\times L.C.=3\times 0.1=0.3mm$