Please help me with the following question.

Dear student,

(a)  Data is entered upto 3 decimal place. hence least count is 0.01 mm

(b)  Least count is 0.01 mm so the instrument is screw gauge.
 
(c) error is ±0.01 mm 
 
(d) percentage error = (0.01/2.70) × 100 = 0.37%


Regards

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