# The pitch and the number of divisions, on the circular scale, for a given screw gauge are 0.5 mm and 100 respectively.  When the screw gauge is fully tightened without any object, the zero of its circular scale lies 3 divisions below the mean line.  The reading of the main scale and the circular scale, for a thin sheet, are 5.5 mm and 48 respectively, the thickness of this sheet is: a. 5.755m b. 5.725mm c. 5.740m d. 5.950mm

## Question ID - 50186 :- The pitch and the number of divisions, on the circular scale, for a given screw gauge are 0.5 mm and 100 respectively.  When the screw gauge is fully tightened without any object, the zero of its circular scale lies 3 divisions below the mean line.  The reading of the main scale and the circular scale, for a thin sheet, are 5.5 mm and 48 respectively, the thickness of this sheet is: a. 5.755m b. 5.725mm c. 5.740m d. 5.950mm

3537

Answer Key : (b) -

LC=

LC=0.5 10−2 mm

+Ve error = 3 0.5 10−2 mm

=1.5 10−2 mm =0.015 mm

Reading=MSR +CSR − (+ve error)

=5.5 mm + (48 0.5 10−2) − 0.015

=5.5+ 0.24 −0.015=5.725 mm

Next Question :

A particle having the same charge as of electron moves in a circular path of radius 0.5 cm under the influence of magnetic field of 0.5T.  If an electric field of 100 V/m makes it to move in a straight path, then the mass of the particle is  (Given charge of electron=1.6 10−19C)

 a. 2.0 10−24kg b. 1.6 10−19kg c. 1.6 10−27kg d. 9.1 10−31kg