Download App

STD 12 - 3. current electricity — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 - 3. current electricity4 Marks
MCQ
$STATEMENT-1$ In a Meter Bridge experiment, null point for an unknown resistance is measured. Now, the unknown resistance is put inside an enclosure maintained at a higher temperature. The null point can be obtained at the same point as before by decreasing the value of the standard resistance. and

$STATEMENT-2$ Resistance of a metal increases with increase in temperature.

  • A
    $STATEMENT-1$ is True, $STATEMENT-2$ is True; $STATEMENT-2$ is a correct explanation for $STATEMENT-1$
  • B
    $STATEMENT-1$ is True, $STATEMENT-2$ is True; $STATEMENT-2$ is $NOT$ a correct explanation for $STATEMENT-1$
  • C
    $STATEMENT - 1$ is True, $STATEMENT-2$ is False
  • ✓
    $STATEMENT -1$ is False, $STATEMENT-2$ is True
✓

Answer

Correct option: D.
$STATEMENT -1$ is False, $STATEMENT-2$ is True
d
$\mathrm{R}_{\text {mlnown }}=\frac{\mathrm{R}(100-\ell)}{\ell}$

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

JEE STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Finger prints are observed by the use of
→
Assertion : In process of photoelectric emission, all emitted electrons do not have same kinetic energy.
Reason : If radiation falling on photosensitive surface of a metal consists of different wavelength then energy acquired by electrons absorbing photons of different wavelengths shall be different.
→
Equation of a progressive wave is given by $y = a\,\sin \pi \,\left[ {\frac{t}{2} - \frac{x}{4}} \right]\,,$ where $t$ is in seconds and $x$ is in meters. The distance through which the wave moves in $8 sec$ is .... $(m)$ (in meter)
→
Assertion $(A):$ An astronaut in an orbiting space station above the earth experience weightlessness.
Reason $(R):$ An object moving around the earth under the influence of earth's gravitational force is in a state of 'free fall'.
→
In an experiment four quantities $a, b, c$ and $d $ are measured with percentage error $1\%, 2\%, 3\%$ and $4\%$ respectively. Quantity $P$ is calculated as follows $P = \frac{{{a^3}{b^2}}}{{cd}}$. $ \%$ error in $P$ is ........ $\%$
→
A heavy solid sphere is thrown on a horizontal rough surface with initial velocity $u$ without rolling. What will be its speed, when it starts pure rolling motion?
→
A stone is shot straight upward with a speed of $20\, m/sec$ from a tower $200\, m$ high. The speed with which it strikes the ground is approximately........$m/sec$
→
In a gravitational field, the gravitational potential is given by, $V =-\frac{ K }{ x }( J / kg )$. The gravitational field intensity at point $(2,0,3)\,m$ is
→
The terminal potential difference of a cell when short-circuited is ($E$ = $E.M.F.$ of the cell)
→
Photoelectric emission is observed from a metallic surface for frequencies ${\nu _1}$ and ${\nu _2}$ of the incident light rays $({\nu _1} > {\nu _2})$. If the maximum values of kinetic energy of the photoelectrons emitted in the two cases are in the ratio of $1:k$, then the threshold frequency of the metallic surface is
→