Question

the distance about 50 cm is measured using a metre stick having mm division.the percentage error is?
(a) 0.2% (b) 0.4% (c) 0.02% (d) 0.002%

Answer 1

least count = 1 mm = 0.1 cm
distance measured = 50 cm

% error = (least count/distace measured)*100 = (0.1/50)*100 = 0.2%

Answer 2

least count = 1 mm = 0.1 cm
distance measured = 50 cm
% error = (least count/distace measured)*100
            = (0.1/50)*100 = 0.2%