Experimental Physics

Which of the following measurements require 'index correction' ?

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…

In a meter bridge experiment. a resistance of $9 \Omega$ is connected in the left gap and an unknown resistance greater than $9 \Omega$ is connected in the right gap. If the resistance in the gaps are interchanged, the…

$N$ divisions on the main scale of a vernier calipers coincide with $\left(N+1\right)$ divisions of the vernier scale. If each division of main scale is $a$units, then the least count of the calipers is

With a resistance of 'X' in the left gap and a resistance of 9 $\Omega\,$ in the right gap of meter bridge, the balance point is obtained at 40 cm from the left end. In what way and to which resistance $3\Omega\,$…

In meter bridge experiment, null point was obtained at a distance ' $l$ ' from left end. The values of resistances in the left and right gap are doubled and then interchanged. The new position of the null point is

Two resistance $\mathrm{X}$ and $\mathrm{Y}$ are connected in the two gaps of a meterbridge and the null points is obtained at $20 \mathrm{~cm}$ from zero end. When the resistance of $20 \Omega$ is connected in series…

In a resonance tube experiment, a tuning fork resonates with air column of length $12 \mathrm{~cm}$ and again resonates when air column is $38 \mathrm{~cm}$ long. The end correction will (b)

In a meter bridge experiment null point is obtained at $l \mathrm{~cm}$ from the left end. If the meter bridge wire is replaced by a wire of same material but twice the area of across-section, then the null point is…

A meter scale is supported on a wedge at its centre of gravity. A body of weight ' $w$ ' is suspended from the 20 cm mark and another weight of 25 gram is suspended from 74 cm mark balances it and the meter scale…

A simple pendulum has a periodic time ' $\mathrm{T}_1$ ' when it is on the surface of earth of radius ' $R$ '. Its periodic time is ' $T_2$ ' when it is taken to a height ' $R$ ' above the earth's surface. The value of…

A glass convex lens is of refractive index $1 \cdot 55$ with both faces of same radius of curvature. What will be the radius of curvature if focal length is to be $20 \mathrm{~cm}$ ?