MCQ
Ohm's law is true
- ✓For metallic conductors at low temperature
- BFor metallic conductors at high temperature
- CFor electrolytes when current passes through them
- DFor diode when current flows
✓
Answer
Correct option: A.
For metallic conductors at low temperature
a
(a) Because with rise in temperature resistance of conductor increase, so graph between $V$ and $i$ becomes non linear.
(a) Because with rise in temperature resistance of conductor increase, so graph between $V$ and $i$ becomes non linear.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
In the circuit shown here, assuming threshold voltage of diode is negligibly small, then voltage $\mathrm{V}_{\mathrm{AB}}$ is correctly represented by :
The number density of free electrons in copper is nearly $8 \times 10^{28}\,m ^{-3} . A$ copper wire has its area of cross section $=2 \times 10^{-6}\,m ^2$ and is carrying a current of $3.2\,A$. The drift speed of the electrons is $.....\times 10^{-6}\,ms ^{-1}$.
→When photon of wavelength ${\lambda _1}$ is incident on a metal surface then speed of ejected fastest electron is $v_1\, m/s$. If photon of wavelength ${\lambda _2}$ incident on the same metal then speed of ejected fastest electron is $v_2\, m/s$. Value of $v_2^2 - v_1^2$ will be
→The length of a given cylindrical wire is increased to double of its original length. The percentage increase in the resistance of the wire will be..... $\%$.
→In the reported figure, two bodies $A$ and $B$ of masses $200\, {g}$ and $800\, {g}$ are attached with the system of springs. Springs are kept in a stretched position with some extension when the system is released. The horizontal surface is assumed to be frictionless. The angular frequency will be $.....\,{rad} / {s}$ when ${k}=20 \,{N} / {m} .$
→Three infinitely long linear charges of charge density $\lambda $ , $\lambda $ and $-2\lambda $ are placed in space. A point in space is specified by its perpendicular distance $r_1 , r_2 $ and $ r_3$ respectively from the linear charges. For the points which are equipotential
→In a photoelectric effect experiment the threshold wavelength of incident light is $380\, nm$, If the wavelength of the incident light is $260\,nm$, the maximum kinetic energy of emitted electrons will be: .............. $eV$
→Given $E$ (in $eV$) $ = \frac{{1237}}{{\lambda \left( {in\,nm} \right)}}$
Newton's second law gives the measure of
An ideal gas is in thermodynamic equilibrium. The number of degrees of freedom of a molecule of the gas in $n$. The internal energy of one mole of the gas is $U_n$ and the speed of sound in the gas is $v_n$. At a fixed temperature and pressure, which of the following is the correct option?
→A conducting loop is placed in a uniform magnetic field with its plane perpendicular to the field. An $emf$ is induced in the loop if
→$(a)$ It is translated (inside the field)
$(b)$ It is rotated about its axis
$(c)$ It is rotated about a diameter
$(d)$ It is deformed