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?

1.42 mm

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1.6 mm

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1.2 mm

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1.38 mm

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Solution

The correct option is C 1.2 mm
Measured thickness of the pencil (observed reading) = 1.4 mm

Zero error = +0.02 cm = +0.2 mm
[Since 1 cm = 10 mm]

Correct reading = Measured reading - zero error
Hence, Correct reading = 1.4 mm - 0.2 mm = 1.2 mm

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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 ?

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In a vernier callipers, there are 10 divisions on the vernier scale and 1 cm on the main scale is divided in 10 parts. While measuring a length, the zero of the vernier lies just ahead of 1.8 cm mark and 4th division of vernier coincides with a main scale division.

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Name the part of the vernier callipers which is used to measure the following :

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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?

The correct option is C 1.2 mmMeasured thickness of the pencil (observed reading) = 1.4 mm Zero error = +0.02 cm = +0.2 mm [Since 1 cm = 10 mm] Correct reading = Measured reading - zero error Hence, Correct reading = 1.4 mm - 0.2 mm = 1.2 mm

The correct option is C 1.2 mm
Measured thickness of the pencil (observed reading) = 1.4 mm

Zero error = +0.02 cm = +0.2 mm
[Since 1 cm = 10 mm]

Correct reading = Measured reading - zero error
Hence, Correct reading = 1.4 mm - 0.2 mm = 1.2 mm