Embibe Experts Solutions for Chapter: Experimental Physics, Exercise 1: Exercise 1

The diameter of a wire is measured with a screw gauze having least count $0.01 \mathrm{mm}$. Which of the following correctly expresses the diameter 

What is vernier constant

The vernier of a circular scale is divided into $30$ divisions which coincide against $29$ divisions of main scale. Each main scale division is $0.5°$. The least count of the instrument is 

What is the reading of micrometer screwgauge shown in figure :-

In a vernier calipers the main scale and the vernier scale are made up different materials. When the room temperature increases by $\mathrm{\Delta }T°\mathrm{C}$, it is found the reading of the instrument remains the same. Earlier it was observed that the front edge of the wooden rod placed for measurement crossed the $N^{\mathrm{th}}$ main scale division and $N+2 \mathrm{MSD}$  coincided with the $2^{\mathrm{nd}} \mathrm{VSD}$. Initially, $10 \mathrm{VSD}$  coincided with$9 \mathrm{MSD}$. If coefficient of linear expansion of the main scale is ${\alpha }_1$ and that of the vernier scale is ${\alpha }_2$ then what is the value of $\frac{{\alpha }_1}{{\alpha }_2}$ ? (Ignore the expansion of the rod on heating)

Consider the $MB$ shown in the diagram, let the resistance $X$ have temperature coefficient ${\alpha }_1$ and the resistance from the $RB$ have the temperature coefficient ${\alpha }_2.$ Let the reading of the meter scale be $10 \mathrm{cm}$ from the $\mathrm{LHS}$. If the temperature of the two resistance increase by small temperature $\mathrm{\Delta }$$T$ then what is the shift in the position of the null point? Neglect all the other changes in the bridge due to temperature rise.

In a meter bridge experiment, the one meter long wire used must possess

In a screw gauge, there are $100$ divisions in circular scale and each main scale division is of $1 \mathrm{mm}$. With no gap between the jaws, ${98}^{\mathrm{th}}$ divisions coincides with the main scale and zero of main scale is not visible. While measuring the diameter of a ball, the circular scale is between $3 \mathrm{mm}$ mark and $4 \mathrm{mm}$ mark. ${76}^{\mathrm{th}}$ division of circular scale coincides with the reference line. Select the correct alternative