JEE PYQ: Experimental Physics Question 2
Question 2 - 2021 (17 Mar 2021 Shift 1)
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)
(1) 8.36 cm
(2) 8.54 cm
(3) 8.58 cm
(4) 8.56 cm
Show Answer
Answer: (2)
Solution
Positive zero error $= 0.2$ mm $= 0.02$ cm. Main scale reading $= 8.5$ cm. Vernier scale reading $= 6 \times 0.01 = 0.06$ cm. Final reading $= 8.5 + 0.06 - 0.02 = 8.54$ cm.
BETA
