Question:
The vernier scale used for measurement has a positive zero error of 0.2 mm. If while taking a measurement it was noted that '0' on the vernier scale lies between 8.5 cm and 8.6 cm, vernier coincidence is 6, then the correct value of measurement is ___________ cm. (least count = 0.01 cm)
The vernier scale used for measurement has a positive zero error of 0.2 mm. If while taking a measurement it was noted that '0' on the vernier scale lies between 8.5 cm and 8.6 cm, vernier coincidence is 6, then the correct value of measurement is ___________ cm. (least count = 0.01 cm)
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Observed reading = main scale + coincidence x least count; subtract the positive zero error.
Updated On: Nov 4, 2026
- 8.58 cm
- 8.54 cm
- 8.56 cm
- 8.36 cm
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The Correct Option is B
Solution and Explanation
Main scale reading = 8.5 cm; vernier coincidence = 6, least count = 0.01 cm.
Observed reading = \(8.5+6\times0.01=8.56\) cm.
Positive zero error = 0.2 mm = 0.02 cm, and correct reading = observed - zero error.
Correct value = \(8.56-0.02=8.54\) cm.
Answer: (2) 8.54 cm
Observed reading = \(8.5+6\times0.01=8.56\) cm.
Positive zero error = 0.2 mm = 0.02 cm, and correct reading = observed - zero error.
Correct value = \(8.56-0.02=8.54\) cm.
Answer: (2) 8.54 cm
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