MCQ
The unit of specific resistance is
  • A
    $Ohm/c{m^2}$
  • B
    $Ohm/cm$
  • $Ohm - cm$
  • D
    ${(Ohm - cm)^{ - 1}}$

Answer

Correct option: C.
$Ohm - cm$
c
(c) $R = \rho \frac{L}{A} \Rightarrow \rho = \frac{{RA}}{L} = ohm \times cm$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

A steel wire of lm long and $1\,m{m^2}$ cross section area is hang from rigid end. When weight of $1\,kg$ is hung from it then change in length will be given ..... $mm$ $(Y = 2 \times {10^{11}}N/{m^2})$
Two full turns of the circular scale of screw gauge cover a distance of $1\,mm$ on scale. The total number of divisions on circular scale is $50$. Further, it is found that screw gauge has a zero error of $+0.03\,mm$. While measuring the diameter of a thin wire a student notes the main scale reading of $3\,mm$ and the number of circular scale division in line, with the main scale is $35$. The diameter of the wire is .......... $mm$
Sound wave travels with a velocity of $300\, m\, s^{-1}$ through a gas. $9\, beats$ are produced in $3\, s$ when two waves pass through it simultaneously. If one of the waves has $2\, m$ wavelength, the wavelength of the other wave is ..... $m$
Two samples $A$ and $B$ are initially kept in the same state. Sample $A$ is expanded through an adiabatic process and the sample $B$ through an isothermal process. The final volumes of the samples are the same. The final pressures in $A$ and $B$ are $p_A$ and $p_B$ respectively.
If the time period of a two meter long simple pendulum is $2\, s$, the acceleration due to gravity at the place where pendulum is executing $S.H.M.$ is
In the figure a container is shown to have a movable (without friction) piston on top. The container and the piston are all made of perfectly insulating material allowing no heat transfer between outside and inside the container. The container is divided into two compartments by a rigid partition made of a thermally conducting material that allows slow transfer of heat. The lower compartment of the container is filled with $2$ moles of an ideal monatomic gas at $700 \ K$ and the upper compartment is filled with $2$ moles of an ideal diatomic gas at $400$

K. The heat capacities per mole of an ideal monatomic gas are $C_v=\frac{3}{2} \ R, C_p=\frac{5}{2} R$, and those for an ideal diatomic gas are $C _{ v }=\frac{5}{2} \ R , C _{ P }=\frac{7}{2} R$.

$1.$ Consider the partition to be rigidly fixed so that it does not move. When equilibrium is achieved, the final temperature of the gases will be :

$(A)$ $550 \ K$ $(B)$ $525 \ K$ $(C)$ $513 \ K$ $(D)$ $490 \ K$

$2.$ Now consider the partition to be free to move without friction so that the pressure of gases in both compartments is the same. Then total work done by the gases till the time they achieve equilibrium will be:

$(A)$ $250 \ R$ $(B)$ $200 \ R$ $(C)$ $100 \ R$ $(D)$ $-100 \ R$

Give the answer question $1$ and $2.$

In a simple pendulum experiment for determination of acceleration due to gravity $(g)$, time taken for $20$ oscillations is measured by using a watch of $1\, second$ least count. The mean value of time taken comes out to be $30\,s$. The length of pendulum is measured by using a meter scale of least count $1\, mm$ and the value obtained is $55.0\, cm$. The percentage error in the determination of $g$ is close to  ........... $\%$
A motor car is going due north at a speed of 50km/h. It makes a 90° left turn without changing the speed. The change in the velocity of the car is about:
Two gases have the same initial pressure, volume and temperatue. They expand to the same final volume, one adiabatically and the other isothermally
A liquid of mass $1$ $kg$ is filled in a flask as shown in figure. The force exerted by the flask on the liquid is $(g = 10\  m/s^2)$[Neglect atmospheric pressure]: