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Current through battery of emp 6 V will be

1. 8 A
2. 6 A
3. 2 A
4. 4 A

The current in 9$\mathrm{\Omega }$ resister is

1. 2 A
2. 1 A
3. 3 A
4. 4 A

If potential difference between terminals to R${}_1$ is V, then potential difference across R${}_2$ is

1. 3 V
2. 2 V
3. V
4. 4 V

The potential difference between points A and B in the following circuit diagram will be

1. 8 V
2. 6 V
3. 4 V
4. 2 V

In the given circuit diagram. Find the value of current in resistance R.


1. 2 A
2. $\frac{3}{2}$A
3. 1 A
4. 4 A

In the given circuit, the equivalent resistance between point A and B is

1. $\frac{10}{3}\Omega$
2. $\frac{5}{3}\Omega$
3. $\frac{24}{57}\Omega$
4. $\frac{57}{24}\Omega$

In the circuit shown, a meter bridge is in its balanced
state. The meter bridge wire has a resistance
0.1 ohm/cm. The value of unknown resistance X and
the current drawn from the battery of negligible resistance is

1. 6$\mathrm{\Omega }$ , 5 amp
2. 4$\mathrm{\Omega }$ , 0.1 amp
3. 4$\mathrm{\Omega }$ , 1.0 amp
4. 12$\mathrm{\Omega }$ , 0.5 amp

Resistance of A is 5 times of the resistance of B. Heat produced in A by Joule’s law is H. Then heat produced in B in same time interval is

1. 5 H
2. 25 H
3. $\frac{\mathrm{H}}{5}$
4. $\frac{\mathrm{H}}{25}$

The switches S${}_1$ and S${}_2$ are open. If now S${}_1$ is closed but S${}_2$ remain open, then current through the battery 

1. Increases by 1 A
2. Remain same
3. Increases by 5 A
4. Increases by 11 A

Two sources of emf 6V and internal resistance 3$\mathrm{\Omega }$ and 2$\mathrm{\Omega }$ are connected to an external resistance R as shown. If potential difference across source A is zero, then value of R is

1. 1$\mathrm{\Omega }$
2. 2$\mathrm{\Omega }$
3. 3$\mathrm{\Omega }$
4. 4$\mathrm{\Omega }$

The circuit as shown in figure. The ratio of current ${\mathrm{i}}_1/{\mathrm{i}}_2$

1. 2
2. 8
3. 0.5
4. 4

The resistance of a wire is 10$\mathrm{\Omega }$ . Its length is increased by 10% by stretching. The new resistance will now be nearly
1. 12$\mathrm{\Omega }$
2. 1.2$\mathrm{\Omega }$
3. 13$\mathrm{\Omega }$
4. 11$\mathrm{\Omega }$

Find the equivalent resistance across AB

1. 1$\mathrm{\Omega }$
2. 2$\mathrm{\Omega }$
3. 3$\mathrm{\Omega }$
4. 4$\mathrm{\Omega }$

Reading in the ideal ammeter A is

1. 2 A
2. 3.33 A
3. 1.25 A
4. 3.75 A

${\mathrm{\epsilon }}_1$ = 10V , ${\mathrm{\epsilon }}_2$ = 20V, ${\mathrm{r}}_1$ = 2$\mathrm{\Omega }$, ${\mathrm{r}}_2$ = 3$\mathrm{\Omega }$, R = 5$\mathrm{\Omega }$ potential difference across R is

1. 5 V
2. 10 V
3. 15 V
4. 20 V

In the circuit shown in figure if power dissipated in 9$\mathrm{\Omega }$ resister is 144W, then potential difference across 3.6$\mathrm{\Omega }$ resister will be

1. 36 V
2. 18 V
3. 9 V
4. Zero

A battery of internal resistance r, when connected across 2$\mathrm{\Omega }$ resister supplies a current of 4A, when the same battery is connected across a 5$\mathrm{\Omega }$ resistor, it supplies a current of 2A. The value of r is
1. 2$\mathrm{\Omega }$
2. 1$\mathrm{\Omega }$
3. 0.5$\mathrm{\Omega }$
4. Zero

In the circuit shown in figure find the value of r (internal resistance of the cell) for which power transferred by the cell is maximum

1. 4$\mathrm{\Omega }$
2. 12$\mathrm{\Omega }$
3. 16$\mathrm{\Omega }$
4. 8$\mathrm{\Omega }$

For the circuit shown in figure, the value of R must be

1. 3$\mathrm{\Omega }$
2. 4$\mathrm{\Omega }$
3. 5$\mathrm{\Omega }$
4. 6$\mathrm{\Omega }$

If I be the current limit of a fuse wire of length $\mathcal{l}$ and radius r, then select the appropriate relation
1. l $\propto$ $\mathcal{l}$
2. l $\propto$ ${\mathrm{r}}^2$
3. l $\propto$ ${\mathcal{l}}^0$
4. l $\propto$ ${\mathrm{r}}^0$

Property possessed by only ferromagnetic substance is :
1. Attracting magnetic substance
2. Hysteresis
3. Susceptibility independent of temperature
4. Directional property

The area of B–H loop for soft iron, as compared to that for steel is :-
1. More
2. Less
3. Equal
4. None of the above

The liquid in the watch glass in the following figure is:

1. Ferromagnetic
2. Paramagnetic
3. Diamagnetic
4. Nonmagnetic

The value of magnetic susceptibility for super–conductors is :-
1. Zero
2. Infinity
3. +1
4. –1

If the magnetic susceptibility of a magnetic material is – 0.004 then its nature will be :-
1. Diamagnetic
2. Paramagnetic
3. Ferromagnetic
4. Non magnetic

The area of hysteresis loop of a material is equivalent to 250 Joule. When 10 kg material is magnetised by an alternating field of 50Hz then energy lost inone hour will be if the density of material is 7.5 gm/cm${}^3$.
1. 6 x 10${}^4$ Joule
2. 6 x 10${}^4$ Erg
3. 3 x 10${}^2$ Joule
4. 3 x 10${}^2$ E

The coercivity of a bar magnet is 100A/m. It is to be demagnetised by placing it inside a solenoid of length 100 cm and number of turns 50. The current flowing the solenoid will be :-
1. 4A
2. 2A
3. 1A
4. zero

The magnetic susceptibility of a paramagnetic material at –73°C is 0.0075 then its value at –173°C will be :-
1. 0.0045
2. 0.0030
3. 0.015
4. 0.0075

The dipole moment of each molecule of a paramagnetic gas is 1.5x10${}^{-23}$ A-m${}^2$. the temperature of gas is 27°C and the number of molecules per unit volume in it is 2.0x10${}^{26}$ m${}^{-3}$. The maximum possible intensity of magnetisation in the gas will be (in A/m) :-
1. 3 x 10${}^3$
2. 4 x 10${}^{-3}$
3. 5 x 10${}^5$
4. 6 x 1

Diamagnetic substance are :-
1. Feebly attracted by magnets
2. Strongly attracted by magnets
3. Feebly repelled by magnets
4. Strongly repelled by magnets