Name the part of the vernier calipers which is used to measure the external diameter of a tube.
A
Depth robe
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B
Retainer
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C
Inside small jaw
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D
Outside large jaws
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Solution
The correct option is C Outside large jaws The outside large jaws, marked as 1, 1(AB) in the figure, are used to measure the thickness or external diameter of the tubes, cylinders or spheres.