More from Mohd Muaaz Ansari

Question 4 :
Which physical quantity cannot be determined with the help of potentiometer?<br>

Question 5 :
There are three resistance $5\Omega\, ,\, 6\Omega$ and $8\Omega$connected inparallel to a battery of 15 V and of negligible resistance. The potential drop across $6\Omega$ resistance is

Question 6 :
Assertion(A) : The e.m.f of the cell in secondary circuit must be less than e.m.f of cell in primary circuit in potentiometer.<br/>Reason (R): Balancing length cannot be more than length of potentiometer wire.<br/>

Question 7 :
An electric bulb is rated 220 volt and 100 watt, Power consumed by it when operated on 110 volt is :

Question 8 :
What happens to the current in the external circuit when a battery ages?

Question 11 :
There are three resistance 5$\Omega$, 6$\Omega$ and 8$\Omega$connected inparallel to a battery of 15 V and of negligible resistance.The potential drop across 6$\Omega$resistance is

Question 13 :
An electricity bulb of 100 watt is connected to supply of electricity of 220V. Resistance of filament is

Question 14 :
State whether True or False<br/>It is&#160;possible that a battery has some constant value of emf but the potential difference between the plates is zero.

Question 15 :
The internal resistance of a cell of emf $1.5V$, if it can deliver a maximum current of $3 A$ &#160;is<br/>

Question 16 :
On which one of the following the emf of a cell does not depend :&#160;

Question 17 :
A room has AC run hours a day at a voltage of $220$V. The wirng of the room consists of Cu of $1$mm radius and a length of $10$m. Power consumption per day is $10$ commercial units . The fraction of it goes in the joule heating in wires is: $\rho_{cu}=1.7\times10^{-8}\Omega m$

Question 20 :
By increasing the temperature, the specific resistance of a conductor and a semiconductor.

Question 21 :
Formula of internal resistance of primary cell in the form of balancing length is $\left \{l_{1} and l_{2} \text {are the balancing lengths in open and closed circuit respectively}\right \}$.

Question 22 :
Two resistances $R_1$ and $R_2$ are made of different materials. The temperature coefficient of the material of $R_1$ is $\alpha$ and that of material of $R_2$ is $-\beta$. The material of $R_1$ and $R_2$ will not change with temperature if $\displaystyle \frac {R_1}{R_2}$ equal to

Question 23 :
A potentiometer circuit has been set up for finding the internal resistance of a given cell. The main battery,used across the potentiometer wire, has an emf of 2.0 V and a negligible internal resistance. Thepotentiometer wire itself is 4 m long. When the resistance, R, connected acrose the given cell, has valuesof<br>(i) infinity (ii) $9.5\Omega$<br>The 'balancing lengths, on the potentiometer wire are found to be 3m and 2.85 m, respectively.The value of internal resistance of the cell is

Question 24 :
Two resistors, $R_1$ and$R_2$, are identical, but the potentialdifference across$R_1$is half the potential differenceacross$R_2$. What is the ratio of the current in$R_1$to thecurrent in$R_2$?

Question 25 :
The resistance of a wire at temperature $30 ^{\circ}\ C$ is found to be $10\ \Omega$. Now to increase the resistance by $10\%,$ the temperature of the wire must be $($ The temperature coefficient of resistanceof the material of the wire is $0.002\; {^{\circ}C}^{-1}$ and reference temperature is $0 ^{\circ}\ C)$.

Question 26 :
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 27 :
The resistance of a galvanometer is 10$\Omega $ . It gives full-scale deflection when 1 m A current is passed. The resistance connected in series for converting it into a voltmeter of 2.5 V will be

Question 28 :
The Kirchhoff's first law ($\sum$i=0) and secondlaw ($\sum$iR=$\sum$E), where the symbols have their usual meanings, are respectively based on :

Question 29 :
A given resistor has the following colour code of the various strips on it :Brown, black, green and silver. The value of its resistance in ohm is

Question 30 :
Assertion: Total current entering a circuit is equal to leaving the circuit by Kirchhoff's law. Reason: It is based on conservation of energy.