A block measured by a broken scale is 50 cm long. Its actual length is 35 cm. The zero error is

120 mm

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150 mm

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16 cm

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18 cm

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Solution

The correct option is B 150 mm
Zero error is the error that occurs when the length of an object is measured using a scale that has a damaged zero mark or broken left end.

Given,
Actual value = $35 c m$ ,
Measured value = $50 c m$ .

Zero error = Measured value - actual value
Zero error = $50 c m - 35 c m = 15 c m$

Thus, the zero error is 15 cm or 150 mm

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