Question 2 :
On which one of the following the emf of a cell does not depend : 
Question 4 :
At what temperature would the resistance of a copper conductor be double its resistance at $0^o$C? Given $\alpha$ for copper is $3.9\times 10^{-3}$ $^oC^{-1}$.
Question 5 :
An amount of electrical energy consumed in a circuit per unit time is
Question 6 :
A $24 \,V$ battery having internal resistor of $ X \,\Omega$ is connected to a $4\, \Omega$ resistor, causing a current of $5\,A$. Find out the value of $X$?
Question 7 :
Two resistors of resistance $\displaystyle { R }_{ 1 }$ and$\displaystyle { R }_{ 2 }$ having$\displaystyle { R }_{ 1 }>{ R }_{ 2 }$ are connected in parallel. For equivalent resistance R, the correct statement is
Question 8 :
Why is the Wheatstone bridge better than the other methods of measuring resistances?
Question 9 :
Two non ideal batteries are connected in series. Consider the following statements<br>(A) The equivalent emf is larger than either of the two emfs.<br>(B)The equivalent internal resistance is smaller than either of the two internal resistances.
Question 10 :
Assertion : Material used in the construction ofa standard resistance is constantan or manganin<br>Reason : Temperature coefficients of constantan and Magnanin arevery small<br>
Question 12 :
If n resistance (each R) are connected in parallel then the resultant will be
Question 13 :
A 24V potential difference is applied across a parallel combination of four 6 ohm resistor. The current in each resistor is:<br/>
Question 14 :
Which color band in the color coding of aresistor has the tolerance $\pm2$%?
Question 16 :
Potentiometer wire of length 1 m is connected in series with 490 $\Omega$ resistance and 2 V battery. If 0.2 mV/cm is the potential gradient, the resistance of the potentiometer wire is<br>
Question 17 :
Two cells of same emf E but different internal resistances $r_1$ and $r_2$ are connected in series with an external resistance $R$. The potential drop across the first cell is found to be zero. The external resistance $R$ is <br/>
Question 18 :
Which of the following is not the advantage of Carbon resistors?
Question 19 :
Assertion (A) :In a metrebridge ; Copper wire is connected in the left gap and silicon is connected in the right gap. When the temperature of both wires increase, balancing point shifts to right.<br/>Reason (R) :Temperature coeficient of copper is (-)Ve and that of silicon is (+) Ve.<br/>
Question 20 :
A 30V-90W lamp is operated on a 120 V DC line. A resistor is connected in series with the lamp in order to glow it properly. The value of resistance is
Question 21 :
Five cells of emf 1.5V and internal resistance 0.2 ohm are connected in series. The maximum current that can be delivered is<br/>
Question 22 : <p>A battery of emf  $ \in $ and internal resistance r is used in a circuit with variable external resistance R .The value of R for which power consumed in it is maximum will be.</p>
Question 23 :
A battery of 20 cells (each having e.m.f. 1.8 volt and internal resistance 0.1 ohm) is charged by 220 volts and the charging current is 15A. The resistance to be put in the circuit is<br>
Question 24 :
If three resistors of resistance $2\Omega, 4\Omega$ and $5 \Omega$ are connected inparallel then the total resistance of the combination will be
Question 25 :
At what temperature will the resistance of a copper wire become three times its value at $0^{\circ}C$[Temperature coefficient of resistance for copper $=4\times 10^{-3}per^{\circ}C$] :-<br>
Question 26 :
When a battery sends current through the resistances <span class="MathJax"><span class="math"><span class="mrow"><span class="msubsup"><span class="mi">$R<span class="mn">_1$ and $R_2<span class="MJX_Assistive_MathML">R$, the internal resistance of battery is :<br/>
Question 27 :
Electric current is due to flow of charge carriers in the conductors. Which of the following is/are correct?<br>
Question 28 : <p>A potentiometer wire has length $4$m and resistance $8\Omega$.What should be the resistance that must be connected in series with the wire and an accumulator of emf $2$V, so as to get a potential gradient $1$mV per cm on the wire?</p>
Question 29 :
A dynamo develops $0.5 A$ at $6 V$, the power delivered is ______.
Question 30 :
A cell of constant $emf$ first connected of a resistance $R_{1}$ and then connected to a resistance $R_{2}$. If power delivered in both cases is same then the internal resistance of the cell is:
