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a
If the zero of vernier scale does not coincide with the zero of the main scale, then the vernier callipers is said to be having zero error
b
Zero correction has a magnitude equal to zero error but sign is opposite to that of zero error.
c
Zero error is positive when the zero of vernier scale lies to the left of the zero of the main scale
d
Zero error is negative when the zero of vernier scale lies to the left of the zero of the main scale
answer is C.
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