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When a piece of wire is held diametrically in a screw gauge [pitch =1 ~mm , number of division on circular scale =100] . The readings obtained are as shown: Now if we measure the same with help of vernier callipers [ 1 MSD =1 ~mm , 10 divisions of vernier coinciding with 9 divisions of main scale] having a negative zero error of 0.5 mm , then find which of the following figures correctly represents the reading.

Correct answer

0

Step-by-step solution

From screw gauge z.e. =+0.20 ~mm Dia of chalk =3.5-0.2=3.3 ~mm =0.33 ~cm For vernier callipers, z.e. =-0.05 ~cm Thus it must show 0.33-0.05=0.28 ~cm so (a) is correct

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