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Question: Answered & Verified by Expert
A student measured the length of a rod and wrote it as 3.50 cm. Which instrument did he use to measure it ?
PhysicsExperimental PhysicsJEE MainJEE Main 2014 (06 Apr)
Options:
  • A A meter scale
  • B A vernier calliper where the 10 divisions in vernier scale matches with 9 division in main scale and main scale has 10 divisions in 1 cm
  • C A screw gauge having 100 divisions in the circular scale and pitch as 1 mm
  • D A screw gauge having 50 divisions in the circular scale and pitch as 1 mm
Solution:
2416 Upvotes Verified Answer
The correct answer is: A vernier calliper where the 10 divisions in vernier scale matches with 9 division in main scale and main scale has 10 divisions in 1 cm
As per given data the Vernier has a least count of 0.01 cm, which is consistent with the information given in question.

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