
Physics 12th ICSE
QuizĀ by BIBEKANANDA ROUT
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A new flashlight cell of emf 1.5 volts gives a current of 15 amps, when connected directly to an ammeter of resistance 0.04 ā¦. The internal resistance of cell is
A torch bulb rated as 4.5 W, 1.5 V is connected as shown in the figure. The emf of the cell needed to make the bulb glow at full intensity is

In meter bridge, the balancing length from left end when standard resistance of 1 ⦠is in right gap is found to be 20 cm. The value of unknown resistance is
A Daniel cell is balanced on 125 cm length of a potentiometer wire. When the cell is short circuited with a 2 ⦠resistance, the balancing length obtained is 100 cm. Internal resistance of the cell will be
A network of resistors is connected to a 16 V battery with internal resistance of 1⦠as shown in the Fig. Compute the equivalent resistance of the network.

In a meter bridge as shown, the balance point is found to be at 39.5 cam from the end A, when the resistor Y is of 12.5 ā¦. Determine the balance point of the bridge above if X and Y are interchanged.

The figure below shows a 2.0 V potentiometer used for the determination of internal resistance of a1.5 V cell. The balance point of the cell in open circuit is 76.3 cm. When a resistor of 9.5 ⦠is used in the external circuit of the cell, the balance point shifts to 64.8 cm length of the potentiometer wire. Determine the internal resistance of the cell.

Equal potentials are applied on an iron and copper wire of same length. In order to have same current flow in the wire, the ratio (riron/rcopper) of their radii must be [Given that specific resistance of iron = 1.0 x 10-7 ā¦m and that of copper = 1.7 x 10-8 ā¦m]
The V-i graph for a conductor at temperature T1 and T2 are as shown in the figure. (T2 ā T1) is proportional to

Length of a hollow tube is 5 m, its outer diameter is 10 cm and thickness of its wall is 5 mm. If resistivity of the material of the tube is 1.7 x 10-8 ⦠m, then the resistance of the tube will be

Five resistances are combined according to the figure. The equivalent resistances between the points X and Y will be

A wire of resistance 0.5 ā¦m-1 is bent into a circle of radius 1m. The same wire is connected across a diameter AB as shown in the fig. The equivalent resistance is

A metal rod of length 10 cm and a rectangular cross-section of 1cm x ½ cm is connected to a battery across opposite faces. The resistance will be
Kirchhoffās II law for the electric network is based on:
Determine the electric current through branch BD of the electric network:

WSB experiment is most sensitive, when:
In a Whetstoneās bridge, all the four arms have equal resistance R. If resistance of the galvanometer arm is also R, then equivalent resistance of the combination is-
For a cell of e.m.f. 2 V, a balance is obtained for 50 cm of the potentiometer wire. If the cell is shunted by a 2 ohm resistor and the balance is obtained across 40 cm of the wire, then the internal resistance of the cell is :
For a cell, the terminal potential difference is 3.6 V, when the circuit is open. If the potential difference reduces to 3 V, when cell is connected to a resistance of 5 Ī©, the internal resistance of cell is (in ohm) :
The temperature coefficient of resistance for a wire is 00125 /ĖC . At 27°K its resistance is 1 ohm. The temperature at which the resistance becomes 2 ohm is
Drift velocity vd varies with the intensity of electric field as per the relation :
A cell of internal resistance 3 ohm and emf 10 volt is connected to a uniform wire of length 500 cm and resistance 3 ohm. The potential gradient in the wire is:
In a Whetstoneās bridge, all the four arms have equal resistance R. If resistance of the galvanometer arm is also R, then equivalent resistance of the combination is
Across a wire of length l and thickness d, a P.D of V is applied. If the P.D. is doubled then the drift velocity becomes-
Which is the dimensional formula for resistance from the given below?
Two electric bulbs whose resistances are in the ratio of 1:2 are connected in parallel to a constant voltage source the power dissipated in them have the ratio-
The resistance of a copper coil is 4. 64Ī© at40 0C and 5.6Ī© at 100 0C. Its resistance at 0 0C will be-
A uniform wire is cut into 10 segments increasing in length in equal steps. The resistance of shortest segment is R and the resistance of the other segments increases in steps of 6 Ī©. If the resistance of the longest segment is 3R, then the value of R is:
Current provided by a battery is maximum when
An energy source will supply a constant current into the load if its internal resistance is
If in the experiment of Wheatstone's bridge, the positions of cells and galvanometer are interchanged, then balance points will
For comparing the e.m.f.'s of two cells with a potentiometer, a standard cell is used to develop a potential gradient along the wires. Which of the following possibilities would make the experiment unsuccessful
The resistance of an ideal ammeter is
A galvanometer has 30 divisions and a sensitivity 16ļA / div. It can be converted into a voltmeter to read 3 V by connecting
A 10 m long wire of 20ļ resistance is connected with a battery of 3 volt e.m.f. (negligible internal resistance) and a 10 ļ resistance is joined to it is series. Potential gradient along wire in volt per meter is

Specific resistance of a conductor increases with :ā
The voltage V and current I graph for a conductor at two different temperaturesT1Ā and T2Ā are shown in the figure. The relation betweenT1Ā and T2Ā is

When no current flows through a conductor :-
What is the effect on the product of resistivity and conductivity of a conductor when its temperature is increased?