The least count of the main scale of a vernier caliper is $0.05 \mathrm{cm}$. If there are $50$divisions on the vernier scale and they are equal to $49$divisions of the main scale then the vernier constant is

To determine the spring constant of a spring following graph is plotted. The graph shows the variation of mass $m$ in pan versus the extension $\left(e\right)$.

Following ray diagram is obtained by a student in laboratory. What is the refracting angle $A$ of the prism

This circuit can be used to determine the resistance $x$if the

In a carbon resistor the colour code is as following

Red Orange Yellow Golden

the resistance of resistor is

Consider the following circuit, the device in the box is not known. When the key is closed, the galvanometer initially gives some deflection but finally it decays to zero

In an experiment of determination of focal length of a lens with the help of optical bench, a student obtained the following curve for convex lens.