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Q.

A screw gauge has 50 divisions on its circular scale. The circular scale is 4 units ahead of the pitch scale making, prior to use. Upon one complete rotation of the circular scale, a displacement of 0.5 mm is noticed on the pitch scale. The nature of zero error involved, and the least count of the screw gauge, are respectively :

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a

Negative, 2  μm

b

Positive, 10 μm

c

Positive, 0.1 mm 

d

Positive, 0.1 μm

answer is B.

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Detailed Solution

No. of division on circular scale of screw gauge = 50 

Pitch = 0.5 mm
Least count of screw gauge 
 =pitchNo.  of  division  on  circular  scale=0.550mm=10  μm
 
And nature of zero error is positive because the circular scale is 4 units ahead of the pitch scale making, prior to use, when studs are in contact.
 

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