What is it called when both jaws of a Vernier caliper are in contact but the zero of the main scale does NOT match the zero of the Vernier scale?

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  1. Positive error
  2. Zero error
  3. No error
  4. Negative error

Answer (Detailed Solution Below)

Option 2 : Zero error
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Explanation:

Zero error

When the fixed jaw and sliding jaw are closed, but the zero on the vernier scale coincides with zero on the main scale. Then the vernier caliper does not have zero error.

F1 Krupalu Madhu 15.09.20 D1

When the fixed jaw and sliding jaw are closed, but the zero on the vernier scale does not coincide with zero on the main scale. Then the vernier caliper said to have zero error.

There are two types of error

  1. Positive error
  2. Negative error

Positive zero error

  • Positive zero error occurs if zero on the vernier scale lies on right side of zero on the main scale.
  • If the error is positive, correction is negative.

F1 Krupalu Madhu 15.09.20 D2

Negative zero error

  • A negative zero error occurs if zero on the vernier scale lies on the left side of zero on the main scale.
  • If the error is negative, correction is positive.

F1 Krupalu Madhu 15.09.20 D3

Important Points

Zero error is always subtracted from the observed readings. 

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