When current supplied by a cell to a circuit is 0.3 ,A, its termi… - Vidyadip

MCQ

When current supplied by a cell to a circuit is $0.3 \,A$, its terminal potential difference is $0.9 \,V$. When the current supplied becomes $0.25 \,A$, its terminal potential difference becomes $1.0 \,V$. The internal resistance of the cell is ............ $\Omega$

A
$0.5$
✓
$2$
C
$1.2$
D
$1$

✓

Answer

Correct option: B.

$2$

b
(b)

$V=E-ir$

$0.9=E-0.3 r$

$1=E-0.25 r$

$0.1=0.05 r$

$r=2 \Omega$

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

In Young's double slit experiment, the fringe width is $1 \times {10^{ - 4}}m$if the distance between the slit and screen is doubled and the distance between the two slit is reduced to half and wavelength is changed from $6.4 \times {10^{ - 7}}m$ to $4.0 \times {10^{ - 7}}m$, the value of new fringe width will be

A semiconductor $X$ is made by doping a germanium crystal with arsenic $(Z=33)$ . A second semiconductor $Y$ is made by doping germanium with indium $(Z=49)$. The two are joined end to end and connected to a battery as shown. Which of the following statements is correct

The capacity of a parallel plate air condenser is $2 \mu F.$ If a dielectric of dielectric constant $4$ is introduced between the plates, its new capacity is:

If a star can convert all the He nuclei completely into oxygen nuclei. The energy released per oxygen nuclei is $[$Mass of He nucleus is $4.0026$ amu and mass of Oxygen nucleus is $15.9994$ amu$]:$

The true value of angle of dip at a place is $60^o$, the apparent dip in a plane inclined at an angle of $30^o$ with magnetic meridian is

A hollow copper sphere A and a solid sphere B of equal radius are charged with the same potential. The true statement is:

Two thick wires and two thin wires, all of the same materials and same length form a square in the three different ways $P$, $Q$ and $R$ as shown in fig with current connection shown, the magnetic field at the centre of the square is zero in cases

Amplitude modulated wave is represented by

$V _{ AM }=10\left[1+0.4 \cos \left(2 \pi \times 10^{4} t \right)\right] \cos \left(2 \pi \times 10^{7} t \right) \text {. }$

The total bandwidth of the amplitude modulated wave is

Long distance short-wave radio broadcasting uses

Number of electrons in one coulomb of charge will be