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Q.

A screw gauge with a pitch of 0.3 mm and a circular scale with 100 divisions is used to measure the thickness of a thin sheet of steel.  What is the thickness of the sheet if main scale reading is 1mm and the 30th division coincides with the main scale line. (There is no zero error)?

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a

1.9 mm

b

1.09 mm

c

1.1 mm

d

1.99 mm

answer is B.

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Detailed Solution

Least count = pitch  no. of division on circular scale =0.3mm100=0.003mm Measured value =1mm+30×0.003mm=1.09mm
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