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Question

A boy uses a vernier callipers to measure the thickness of his pencil. He measures it to be 1.4 mm. If the zero error of vernier callipers is + 0.02 cm, what is the correct thickness of pencil?

A
1.3 mm
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B
1.2 mm
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C
1.02 mm
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D
1.20 mm
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Solution

The correct option is B 1.2 mm
Correct thickness of pencil = measured thickness of his pencil 1.4 mm – correction
Correct thickness of pencil = 1.4 mm – (+0.02 cm)
Correct thickness of pencil = 1.4 mm – (+0.2 mm)
Correct thickness of pencil = 1.4 mm – 0.2 mm
Correct thickness of pencil = 1.2 mm

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