Name the part of the vernier calipers which is used to measure thickness of a pencil.
A
Lower jaws of vernier calipers
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B
Upper jaws of vernier calipers
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C
Lock screw of vernier calipers
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D
Thumb screw of vernier calipers
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Solution
The correct option is A Lower jaws of vernier calipers The lower jaws marked as 1(AB) in the figure are used to measure the thickness or external diameter of the pencil, tubes etc.