Download App

3. current electricity — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics3. current electricity1 Mark
MCQ
For a metallic wire, the ratio $V/i$ ($V = $ the applied potential difference, $i$ = current flowing) is
  • A
    Independent of temperature
  • ✓
    Increases as the temperature rises
  • C
    Decreases as the temperature rises
  • D
    Increases or decreases as temperature rises, depending upon the metal
✓

Answer

Correct option: B.
Increases as the temperature rises
b
(b) As $\frac{V}{i} = R$ and $R \propto$ temperature

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

Explore more

More "M.C.Q (1 Marks)" from 3. current electricity→3. current electricity — all question types→Physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

A radioactive sample is $a-$emitter with half life $138.6$ days is observed by a student to have $2000$ disintegration$/\sec.$ The number of radioactive nuclei for given activity are
→
If two bulbs of wattage 25 and 100 respectively each rated at 220 volt are connected in series with the supply of 440 volt, then which bulbs will fuse
→
Magnetic field due to 0.1 A current flowing through a circular coil of radius 0.1 m and 1000 turns at the centre of the coil is
→
The focal length of a concave mirror is $f$. An object is placed at a distance $x$ from the focus. The magnification is
→
The potential energy of a system of two charges is negative when:
→
An electric dipole is placed as shown in the figure.The electric potential (in $10^2\,V$ ) at point $P$ due to the dipole is $\left(\in_0=\right.$ permittivity of free space and $\left.\frac{1}{4 \pi \in_0}=K\right)$ :
→
A thin plano-convex lens acts like a concave mirror of focal length 0.2 m when silvered from its plane surface. The refractive index of the material of the lens is 1.5. The radius of curvature of the convex surface of the lens will be
→
A man wearing glasses of focal length $+1m$ cannot clearly see beyond $1m:$
→
In a metre-bridge when a resistance in the left gap is $2\  \Omega$ and unknown resistance in the right gap, the balance length is found to be $40\  \mathrm{~cm}$. On shunting the unknown resistance with $2\  \Omega$, the balance length changes by :
→
Which of the following is an example of a molecule whose centre of mass of positive and negative charges does not coincide each other?
→