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a
i→c;ii→a,c; iii→c; iv→d
b
i→d;ii→a,c;iii→b;iv→c,d
c
i→d; ii→a; iii→c,d; iv→a
d
i→c,d; ii→a,c; iii→a; iv→d
answer is B.
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Detailed Solution
Backlash error is caused by loose fittings, wear and teat, etc. in the screw mechanisms.Zero error may be positive or negative but will always be subtracted.In vernier callipers, least count is the difference between 1 MSD and 1 VSD.Error in screw gauge may be positive or negative and may be due to loose fitting of the circular scale.