Question 1 :
A $$4 m$$ long wire of resistance $$8\Omega$$ is connected in series with a batterry of e.m.f. $$2V$$ and a resistor of $$7\Omega$$. The internal resistance of the battey is $$1\Omega$$. What is the potential gradient along the wire?

Question 2 :
A wire of radius r has resistance R. If it is stretched to a radius $$\displaystyle\frac{r}{2}$$, its resistance will be

Question 4 :
Two wires each of radius of cross section $$r$$ but of different materials are connected together end to end (i.e., in series). If the densities of charge carriers in the two wires are in the ratio $$2: 3$$, the drift velocity of electrons&#160;in the two wires will be in the ratio of<br/>

Question 5 :
The potential difference across the terminals of a battery is $$50V$$ when $$11A$$ are drawn and $$60V$$ when $$1A$$ is drawn. The emf and the internal resistance of the battery are<br/>

Question 6 :
A battery having e.m.f $$5\ V$$ and internal resistance $$0.5\Omega$$ is connected with a resistance of $$4.5\Omega$$ then the voltage at the terminals of battery is

Question 7 :
Assertion : Current is passed through a metallicwire, heating it red. When cold water is pouredon half of it, the rest becomes more hot.<br>Reason : Resistance decreases due to thedecreasein temperature and then current through wireincreases.<br>

Question 8 :
A potentiometer wire of length $$10 m$$ is connected in series with a battery. The e.m.f. of a cell balances against $$250 cm$$ length of wire. If length of potentiometer wire is increased by $$1 m$$, the new balancing length of wire will be

Question 10 :
The resistance of a bulb filament is 100$$\Omega $$ at a&#160;temperature of 100$$^{0}$$C. If its temperature&#160;coefficient of resistance be 0.005 per $$^{0}$$C , its&#160;resistance will become 200$$\Omega $$ at a temperature&#160;of :<br/>

Question 11 :
Statement-1: Theresistivity of asemiconductor decreases with increases of temperature<br><br>Statement-2: In aconducting solid, the rate of collision between free electrons and ionsincreases with the increase of temperature<br>

Question 12 :
A piece of copper and a piece of germanium are cooled from room temperature to $$80K$$. Then, which one of the following is correct?

Question 13 :
For a cell Terminal potential difference is $$2.2V$$ when circuit is open and reduces to $$1.8V$$ when cell is connected to a resistance of $$R=5\Omega$$. Determine internal resistance of cell ($$r$$)

Question 14 :
When Cu and Ge are cooled to $$-150^oC$$ then resistance of Cu .... and that of Ge ....<br>

Question 15 :
Copper contains $$8.4\times 10^{28}$$ free electrons$$/m^3$$. A copper wire of cross-sectional area $$7.4\times 10^{-7}m^2$$ carries a current of $$1$$A. The electron drift speed is approximately.

Question 16 :
Electrical power P is given by the expression&#160; P = $$\dfrac{Q \times V}{t}$$. time. What does $$Q$$ and $$V$$ stand for?

Question 17 :
The resistors of resistances $$2 \Omega, 4 \Omega, 5 \Omega$$ are connected in parallel. The total resistance of the combination will be :

Question 18 :
When a battery sends current through a resistance $$R_1$$ for time t,the heat produced in the resistor is Q.When the same battery sends current through another resistance$$R_2$$ for time t, the heat produced in $$ R_2$$ is again Q.The internal resistance of battery is&#160;

Question 19 :
The reading of poteniometer if $$4 V$$ battery is used instead of $$e$$, is

Question 20 :
The electron beam in a television picture tube travels a distance l in evacuated space of the tube. If the speed of the electrons is v and the beam current is i, then the number of electrons in the beam at any instant will be<br>

Question 21 :
A battery of e.m.f. 3.0 V supplies current through a circuit in which the resistance can be changed. A high resistance voltmeter is connected across the battery. When the current is 1.5 A, the voltmeter reads 2.7 V. The internal resistance of the battery is

Question 22 :
Through a semiconductor, an electric current is due to the drift of

Question 23 :
Two resistances are connected in parallel and a current is sent through the combination. The current divides itself:

Question 24 :
A copper wire of cross-sectional area $$2.0mm^{2}$$, resistivity = $$1.7\times 10^{-8}\Omega m$$, carries a current of 1 A. The electric field in the copper wire is:<br/>

Question 25 :
The length of a potentiometer wire is 10m. The distance between the null points on its wire corresponding to two cells comes out to be 60 cm. If the difference of emf's of the cells is 0.4 volt then the potential gradient on potentiometer wire will be<br>

Question 26 :
Assertion: In a meter bridge experiment, a high resistance is always connected in series with a galvanometer. Reason: As resistance increases, current through the circuit increases.

Question 27 :
The resistance of the wire in the platinum resistance thermometer at ice point is $$5\Omega$$ and at steam point is $$5.25\Omega$$. When the thermometer is inserted in an unknown hot bath its resistance is found to be $$5.5\Omega$$. The temperature of the hot bath is?

Question 28 :
Two wires, each of radius r, but of different materials are connected together end to end. If the densities of charge carriers in the two wires are in the ratio 1:4,the ratio ofthe driftvelocity of electrons in the two wires will be . .

Question 29 :
As the temperature of a metallic resistor is increased, the product of resistivity and conductivity:

Question 30 :
An electric circuit contains an operating heating element and a lit lamp. Which statement bestexplains why the lamp remains lit when the heating element is removed from the circuit?<br>

Question 31 :
A current of 1 A is passed through two resistances 1 $$\Omega $$ and 2 $$\Omega $$ connected in parallel. The current flowing through 2 $$\Omega $$ resistor will be

Question 32 :
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" alt=""/>Potentiometer wire Pq of length 1m is connected to a standard cell $$ E_1 $$ Another cell of E2 of emf1.02v/s connected as shown in the circuit diagram with a resistance 'r' and with a switch 's' . With the switch&#160; S open, null position is obtained at a distance of 51 cm from p,Calculate

Question 33 :
A potnetiometer wire, 10 m long, has a resistance of 40 $$\Omega$$. It is connected in series with a resistance box and a 2 V storage cell. If the potential gradient along the wire is 0.1 m V/cm, the resistance unplugged in the box is:

Question 34 :
The temperature coefficient of resistance of a wire is $$0.00125$$ per $$^{0}C$$. At $$300 K$$, its resistance is $$1 ohm$$. This resistance of the wire will be $$2 ohm$$ at&#160; &#160; &#160; &#160;

Question 35 :
The ratio of the concentration of electrons to that&#160;of holes in a semiconductor is $$\dfrac{7}{4}$$, then what is&#160;the ratio of their drift velocities:<br/>

Question 36 :
A potentiometer having the potential gradient of $$2mV/cm$$ is used to measure the difference of potential across a resistance of $$10\Omega$$. If a length of $$50cm$$ of the potentiometer wire is required to get the null points the current passing through $$10\Omega$$ resistor is (in $$mA$$)

Question 37 :
In a meter bridge experiment, null point is obtained at 20 cm from one end of the wire when resistance X is balanced against another resistance Y. If$$ X&lt; Y $$, then where will be the new position of the null point from the same end, if one decides to balance a resistance of 4 X against Y

Question 38 :
The resistance of carbon filament at $$0^0C$$ is $$104 \Omega$$ . It is connected in series to an iron wire. The temperature coefficient of resistivity of carbon and iron are $$-0.0003$$ and $$+0.0052$$ per degree Celsius&#160;respectively. What must be the resistance of iron wire so that the combined resistance does not change with temperature?

Question 39 :
A bulb is connected to a cell. How is the resistance of circuit affected if another identical bulb is connectedin parallel ?

Question 40 :
Assertion: In a series RLC circuit , if $$ V_R , V_L $$ and $$ V_C $$ denote rms voltage across $$ R , L $$ and $$ C $$ respectively and $$ V_S $$ is the rms voltage across the source , then $$ V_S = V_R + V_L + V_C $$ . Reason: In ac circuit , Kirchhoff's voltage law is correct at every instant of time .

Question 41 :
A potential difference of $$2 V$$ exists across a&#160;potentiometer wire of $$2 m$$ length. When the&#160;potential difference across a $$2\Omega $$ resistance of a&#160;second circuit is measured by the potentiometer&#160;wire, it amounts to $$5 mm$$ balancing length. The&#160;current in the second circuit is&#160;<br/>

Question 42 :
What is the expression for the electrical power spent in flow of current through a conductor in terms of resistance and potential difference ?<br>

Question 43 :
$$n$$ identical cells, each of emf $$E$$ and internal resistance $$r$$, are joined in series to form a closed circuit. One of the cell $$A$$ is joined with reversed polarity. The potential difference across each cell except $$A$$, is&#160;

Question 44 :
An electric wire is connected across a cell of e.m.f $$E$$. The current $$I$$ is measured by an ammeter of resistance $$R$$. According to ohm's law

Question 45 :
The temperature coefficient of resistance of a wire is $$0.00125$$ per degree celcius. At $$300K$$ its resistance is $$1$$ ohm.The resistance of the wire will be $$2$$ ohm at following temperature :-<br>

Question 46 :
The electromotive force of a primary cell is $$2$$ volts. When it is short circuited it gives a current of $$4$$ amperes. Its internal resistances in $$ohms$$ is

Question 47 :
A torch battery consists of two cells of $$1.45$$ volts and an internal resistance $$0.15\Omega$$, each cell sending currents through the filament of the lamps having resistance $$1.5$$ ohms. The value of current will be

Question 48 :
Kirchhoff's voltage law states that the algebraic sum of the product of resistance and current in each part of any closed circuit is equal to the algebraic sum of the emf's in that closed circuit.State which law is this.

Question 49 :
Write true or false for the following statements :<br>The resistivity of all pure metals increase with increase in temperature.

Question 50 :
Assertion: The temperature coefficient of resistance is always positive. Reason: On increasing the temperature the resistance of metals and alloys increase.