A student uses a screw gauge to measure the diameter of a wire. However it has a zero error as shown below when it is used to take a reading, it must be corrected by

adding 0.2 mm

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subtracting 0.2 mm

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adding 0.2 mm

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subtracting 0.02 mm

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Solution

The correct option is D
subtracting 0.02 mm

In this case, zero error is positive because zero is below the datum line. So, the correct reading will be obtained by subtracting 0.02 mm.

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A student uses a screw gauge to measure the diameter of a wire. However it has a zero error as shown below when it is used to take a reading, it must be corrected by

The correct option is D subtracting 0.02 mm In this case, zero error is positive because zero is below the datum line. So, the correct reading will be obtained by subtracting 0.02 mm.

The correct option is D
subtracting 0.02 mm

In this case, zero error is positive because zero is below the datum line. So, the correct reading will be obtained by subtracting 0.02 mm.