Embibe Experts Solutions for Chapter: Experiments in Physics, Exercise 2: Exercise-2

The number of circular divisions on the shown screw gauge is 50 . It moves, $0.5 \mathrm{~mm}$ on main scale for one complete rotation. Main scale reading is 2 . The diameter of the ball is:

The density of a solid ball to be determined in an experiment. The diameter of the ball is measured with a screw gauge, whose pitch is $0.5 \mathrm{mm}$ and there are $50$ divisions on the circular scale. The reading on the main scale is $2.5 \mathrm{mm}$ and that on the circular scale is $20$ divisions. If the measured mass of the ball has a relative error of $2\%$, the relative percentage error in the density is, 

Two full turns of the circular scale of a screw gauge cover a distance of $1 \mathrm{mm}$ on its main scale. The total number of divisions on the circular scale is $50$. Further, it is found that the screw gauge has a zero error of $-0.03 \mathrm{mm}$. While measuring the diameter of a thin wire, a student noted the main scale reading as $3 \mathrm{mm}$ and the number of circular scale divisions in line with the main scale as $35$. The diameter of the wire is,

An experiment is performed to find the refractive index of glass using a travelling microscope. In this experiment, the distance is measured by,