question_answer

Which of the following is most accurate?

A) A screw gauge of least count 0.001 mm

B)  A screw gauge having pitch 1 mm and 50 divisions on circular scale

C)  A vernier callipers of least count 0.01 mm

D)  Vernier callipers having 20 divisions on the sliding scale (vernier scale) coinciding 19 divisions on the main millimetre scale