In standard vernier callipers, when the jaws are in contact with each other if the 5th division on the main scale coincides with the 4th division on the vernier scale, then the zero error is negative.

True

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False

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Solution

The correct option is A True
When the jaws are in contact each other, if zero on main scale coincides the zero on main scale, there is no zero error. For a calipers, 5 th division on main scale coincides with 4th division on vernier scale can happen when zero on vernier is left to the zero of main scale at time of contact jaws. This is called negative zero error. Thus, given statement is true.

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