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  4. 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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Q. 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 $=0.01\,\,cm )$

JEE MainJEE Main 2021Physical World, Units and Measurements

Solution:

Positive zero error $=0.2\, mm$
Main scale reading $=8.5\, cm$
Vemier scale reading $=6 \times 0.01=0.06\, cm$
Final reading $=8.5+0.06-0.02=8.54\, cm$