ICSE Class 9 Answered

(a) What do you understand by the term zero error in vernier callipers? (b) When does a vernier callipers have (i) positive zero error (ii) negative zero error ? (c) State the correction if (i) positive error is 7 div (ii) negative error is 7 div. Least count is 0.01 cm.

Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM

Expert Answer

(a)Zero error of vernier: If the zero of vernier scale and zero of the main scale do not coincide, when the external jaws of verniers are closed, the vernier is said to have zero error.

(b) (i) Positive zero error of vernier: If the zero of the vernier scale is on the right hand side of the zero of main scale, the error is said to be positive error.

(ii) Negative zero error of vernier: If the zero of the vernier scale is on the left hand side of the zero of main scale, the error is said to be negative error.

(ii) Correction= +(7 x 0.01cm) = +0.07 cm.

Answered by | 04 Jun, 2014, 03:23: PM