Experimental Physics

Which of the following measurements require 'index correction' ?

A potentiometer wire $\mathrm{AB}$ having length $L$ and resistance $12r$ is joined to a cell $D$ of emf $\epsilon\,$ and internal resistance $r$. Acell $C$ having EMF$\epsilon\,/2$ and internal resistance $3r$ is…

In a meter bridge experiment, the circuit diagram and the corresponding observation table are shown in figure. S. No. $R\left(\Omega\,\right)$ $l\left(cm\right)$ 1. 2. 3. 4. $1000$ $100$ $10$ $1$ $60$ $13$ $1.5$ $1.0$…

In an experiment to find out the diameter of wire using screw gauge, the following observation were noted: (a) Screw moves $0.5 \mathrm{mm}$ on main scale in one complete rotation (b) Total divisions on circular scale…

In a vernier callipers, each $\mathrm{cm}$ on the main scale is divided into $20$ equal parts. If tenth vernier scale division coincides with nineth main scale division. Then the value of vernier constant will be…

Diameter of a steel ball is measured using a Vernier calipers which has divisions of 0.1 cm on its main scale (MS) and 10 divisions of its Vernier scale (VS) match 9 divisions on the main scale. Three such measurements…

The Vernier constant of Vernier callipers is$0.1\mathrm{mm}$ and it has zero error of $\left(-0.05\mathrm{cm}\right)$. While measuring diameter of a sphere, the main scale reading is $1.7\mathrm{cm}$ and coinciding…

A student in the laboratory measures thickness of a wire using screw gauge. The readings are $1.22\mathrm{mm},1.23\mathrm{mm},1.19\mathrm{mm}$ and $1.20\mathrm{mm}$. The percentage error is $\frac{x}{121}%$. The value…

A travelling microscope is used to determine the refractive index of a glass slab. If 40 divisions are there in $1\mathrm{cm}$ on main scale and $50$ Vernier scale divisions are equal to $49$ main scale divisions, then…

The one division of main scale of vernier callipers reads $1\mathrm{mm}$ and $10$ divisions of Vernier scale is equal to the $9$ divisions on main scale. When the two jaws of the instrument touch each other the zero of…

In a screw gauge, there are $100$ divisions on the circular scale and the main scale moves by $0.5\mathrm{mm}$ on a complete rotation of the circular scale. The zero of circular scale lies $6$ divisions below the line…

The least count of a screw guage is 0.01 mm . If the pitch is increased by $75 \%$ and number of divisions on the circular scale is reduced by $50 \%$, the new least count will be _____ $\times 10^{-3} \mathrm{~mm}$