Question

Choose the wrong statement for zero error and zero correction :

• A. If the zero of the vernier scale does not coincide with the zero of the main scale then the instrument is said to be having a zero error.
• B. Zero correction has a magnitude equal to zero error but sign is opposite to that of the 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 zero of main scale

Answer 1

Answer: (C)

if the zero line of the vernier scale is not coinciding with the main scale the zero error exists. Knowing the zero error necessary correction can be made to find correct measurement. Such a correction is called zero correction.
In positive zero error zero of vernier scale lies to right of the zero of the main scale.