A screw gauge has 50 divisions on its circular scale. The circular scale is 4 units ahead of the pitch scale marking, 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
A
negative, 
B
positive, 
C
positive, 0.1 mm
D
positive, 
Text Solution
Verified by ExpertsThe correct answer is:
B
Given that, number of divisions on circular scale
Least count of screw gauge
Since, circular scale is 4 units ahead of the pitch scale marking which means screw gauge has positive zero error.
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