JEE Questions for Physics Current Electricity I Quiz 18 - MCQExams.com

Two wires of the same material and equal length are joined in parallel combination. If one of them has half the thickness of the other and the thinner wire has a resistance of 8 ohms, the resistance of the combination is equal to

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  • 2)
    Physics-Current Electricity I-65892.png

  • Physics-Current Electricity I-65893.png

  • Physics-Current Electricity I-65894.png
A uniform wire of resistance 9Ω is cut into 3 equal parts. They are connected in the form of equilateral triangle ABC. A cell of e.m.f. 2 V and negligible internal resistance is connected across B and C. Potential difference across AB is
  • 1 V
  • 2 V
  • 3 V
  • 0.5 V
Out of five resistances of resistance R Ω. each 3 are connected in parallel and are joined to the rest 2 inseries. Find the resultant resistance

  • Physics-Current Electricity I-65897.png
  • 2)
    Physics-Current Electricity I-65898.png

  • Physics-Current Electricity I-65899.png

  • Physics-Current Electricity I-65900.png
In the circuit shown, if a conducting wire is connected between point A and B, the current in this wire will
Physics-Current Electricity I-65902.png
  • Be zero
  • Flow from B to A
  • Flow from A to B
  • Flow in the direction which will be decided by the value of V

Physics-Current Electricity I-65904.png

  • Physics-Current Electricity I-65905.png
  • 2 ohm

  • Physics-Current Electricity I-65906.png
  • 3 ohm
In the circuit, the potential difference across PQ will be nearest to
Physics-Current Electricity I-65908.png
  • 9.6 V
  • 6.6 V
  • 4.8 V
  • 3.2 V
Three resistors are connected to form the sides of a triangle ABC, the resistance of the sides AB, BC and CA are 40 ohm, 60 ohm and 100 ohm respectively. The effective resistance between the points A and B in ohm will be
  • 32
  • 64
  • 50
  • 200
Two wires of the same dimensions but resistivitiesρ1 and ρ2 are connected in series. The equivalent resistivity of the combination is

  • Physics-Current Electricity I-65911.png
  • 2)
    Physics-Current Electricity I-65912.png

  • Physics-Current Electricity I-65913.png

  • Physics-Current Electricity I-65914.png
Three unequal resistors in parallel are equivalent to a resistance 1 ohm. If two of them are in the ratio 1 : 2 and if no resistance value is fractional, the largest of the three resistances in ohm is
  • 4
  • 6
  • 8
  • 12
A 3 volt battery with negligible internal resistance is connected in a circuit as shown in the figure. The current I, in the circuit will be
Physics-Current Electricity I-65917.png
  • 1/3 A
  • 1 A
  • 1.5 A
  • 2 A
Find the equivalent resistance between the points a and b
Physics-Current Electricity I-65919.png
  • 2 Ω
  • 4 Ω
  • 8 Ω
  • 16 Ω
The potential difference between point A and B is
Physics-Current Electricity I-65921.png

  • Physics-Current Electricity I-65922.png
  • 2)
    Physics-Current Electricity I-65923.png

  • Physics-Current Electricity I-65924.png
  • 0
In the network shown in the figure, each of the resistance is equal to 2 Ω The resistance between thepoints A and B is
Physics-Current Electricity I-65925.png
  • 1 Ω
  • 4 Ω
  • 3 Ω
  • 2 Ω
In the arrangement of resistances shown below, theeffective resistance between points A and B is
Physics-Current Electricity I-65927.png
  • 20Ω
  • 30Ω
  • 90Ω
  • 110Ω
In the Wheatstone\'s bridge shown, P = 2 Ω, Q = 3 Ω, R = 6 Ω and S = 8 Ω. In order to obtain balance, shunt resistance across \'S\' must be
Physics-Current Electricity I-65929.png
  • 2Ω
  • 3Ω
  • 6Ω
  • 8Ω
In the given figure, equivalent resistance between A and B will be
Physics-Current Electricity I-65931.png

  • Physics-Current Electricity I-65932.png
  • 2)
    Physics-Current Electricity I-65933.png

  • Physics-Current Electricity I-65934.png

  • Physics-Current Electricity I-65935.png
In the circuit shown in figure, the current drawn from the battery is 4A. If 10 Ω resistor is replaced by 20 Ω resistor, then current drawn from the circuit will be
Physics-Current Electricity I-65937.png
  • 1 A
  • 2 A
  • 3 A
  • OA
When a wire of uniform cross-section a, length l and resistance R is bent into a complete circle, resistance between any two of diametrically opposite points willbe

  • Physics-Current Electricity I-65938.png
  • 2)
    Physics-Current Electricity I-65939.png
  • 4R

  • Physics-Current Electricity I-65940.png
For the network shown in the figure the value of the current i is
Physics-Current Electricity I-65942.png

  • Physics-Current Electricity I-65943.png
  • 2)
    Physics-Current Electricity I-65944.png

  • Physics-Current Electricity I-65945.png

  • Physics-Current Electricity I-65946.png
Five equal resistances each of resistance R are connected as shown in the figure. A battery of V volts is connected between A and B. The current flowing in AFCEB will be
Physics-Current Electricity I-65948.png

  • Physics-Current Electricity I-65949.png
  • 2)
    Physics-Current Electricity I-65950.png

  • Physics-Current Electricity I-65951.png

  • Physics-Current Electricity I-65952.png
The equivalent resistance and potential difference between A and B for the circuit is respectively
Physics-Current Electricity I-65954.png
  • 4 Ω, 8 V
  • 8 Ω, 4 V
  • 2 Ω, 2 V
  • 16 Ω, 8 V
In a Wheatstone\'s bridge all the four arms have equal resistance R. If the resistance of the galvanometer arm is also R, the equivalent resistance of the combinationas seen by the battery is
  • R/2
  • R
  • 2R
  • R/4
For what value of unknown resistance X, the potential difference between B and D will be zero in the circuit shown in the figure?
Physics-Current Electricity I-65956.png
  • 4Ω
  • 6Ω
  • 2Ω
  • 5Ω
Which arrangement of four identical resistances should be used to draw maximum energy from a cell of voltage V?

  • Physics-Current Electricity I-65958.png
  • 2)
    Physics-Current Electricity I-65959.png

  • Physics-Current Electricity I-65960.png

  • Physics-Current Electricity I-65961.png
A wire has a resistance of 6 Ω. It is cut into two parts and both half values are connected in parallel. The new resistance is ....
  • 12 Ω
  • 1.5 Ω
  • 3 Ω
  • 6 Ω
The total current supplied to the circuit by the battery is
Physics-Current Electricity I-65963.png
  • 1A
  • 2A
  • 4A
  • 6A
An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the lengths and radii of the wires are in the ratio of 4/3 and 2/3, then the ratio of the currents passing through the wire will be
  • 3
  • 1/3
  • 8/9
  • 2
You are provided three resistances 2 Ω, 3 Ω and 6 Ω. How will you connect them so as to obtain the equivalent resistance of 4Ω?

  • Physics-Current Electricity I-65966.png
  • 2)
    Physics-Current Electricity I-65967.png

  • Physics-Current Electricity I-65968.png
  • None of these
When a resistance of 2 ohm is connected across the terminals of a cell, the current is 0.5 A. When the resistance is increased to 5 ohm, the current is 0.25 A. The e.m.f. of the cell is
  • 1.0 V
  • 1.5 V
  • 2.0 V
  • 2.5 V
In circuit shown below, the resistances are given in ohm and the battery is assumed ideal with emf equal to 3 volt. The voltage across the resistance R4 is
Physics-Current Electricity I-65970.png
  • 0.4 V
  • 0.6 V
  • 1.2 V
  • 1.5 V
The equivalent resistance between the points A and B in the following circuit is
Physics-Current Electricity I-65972.png
  • 3.12 Ω
  • 1.56 Ω
  • 6.24 Ω
  • 12.48 Ω
In the circuit shown, the current through 8 ohm is same before and after connecting E. The value of E is
Physics-Current Electricity I-65974.png
  • 12 V
  • 6 V
  • 4 V
  • 2 V
If power dissipated in the 9 Ω resistor in the circuit shown is 36 Watt, the potential difference across the 2 Ω resistor is
Physics-Current Electricity I-65976.png
  • 2 volt
  • 4 volt
  • 8 volt
  • 10 volt
The magnitude and direction of the current in the circuit will be
Physics-Current Electricity I-65978.png
  • 7/3 A from a to b through e
  • 7/3 A from b to a through e
  • 1A from b to a through e
  • 1A from a to b through e
By a cell a current of 0.9 A flows through 2 ohm resistor and 0.3 A through 1 ohm resistor. The internal resistance of the cell is
  • 0.5 Ω
  • 1.0 Ω
  • 1.2 Ω
  • 2.0 Ω
A student measures the terminal potential difference(V) of a cell (of e.m.f E and internal resistance r) as a function of the current (I) flowing through it. The slope, and intercept, of the graph between V and I,then, respectively, equal
  • E and –r
  • –r and E
  • r and –E
  • –E and r
A cell of e.m.f. E is connected with an external resistance R, then p.d. across cell is V. The internal resistance of cell will be

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  • 2)
    Physics-Current Electricity I-65983.png

  • Physics-Current Electricity I-65984.png

  • Physics-Current Electricity I-65985.png
Kirchhoff s first law i.e. ∑i = 0 at a junction is based on the law of conservation of
  • Charge
  • Energy
  • Momentum
  • Angular momentum
The figure below shows currents in a part of electric circuit. The current is p
Physics-Current Electricity I-65988.png
  • 1.7 amp
  • 3.7 amp
  • 1.3 amp
  • 1 amp
See the electrical circuit shown in this figure. Which of the following equations is a correct equation for it?
Physics-Current Electricity I-65990.png
  • ε1– (i1 + iR –i1 r1 = 0
  • ε2 – i1r2 – ε1 – i1r1 = 0
  • –ε2 – (ii + iR – i2r2 = 0
  • ε1 – (i1 + iR + i1r1 = 0
Five conductors are meeting at a point x as shown in the figure. What is the value of current in fifth conductor?
Physics-Current Electricity I-65991.png
  • 3 A away from x
  • 1 A away from x
  • 4 A away from x
  • 1 A towards x
In the circuit shown, A and V are ideal ammeter and voltmeter respectively. Reading of the voltmeter will be
Physics-Current Electricity I-65993.png
  • 2 V
  • 1 V
  • 0.5 V
  • Zero
When a resistance of 2 ohm is connected across the terminals of a cell, the current is 0.5 ampere. When the resistance is increased to 5 ohm, the current is 0.25 ampere. The internal resistance of the cell is
  • 0.5 ohm
  • 1.0 ohm
  • 1.5 ohm
  • 2.0 Ω
A 5 V battery with internal resistance 2 Ω and a 2 V battery with internal resistance 1 Ω are connected toa 10 Ω resistor as shown in the figure
Physics-Current Electricity I-65995.png
  • 0.03 A P1 to P2
  • 0.03 A P2 to P1
  • 0.27 A P1 to P2
  • 0.27 A P2 to P1
A 50 V battery is connected across a 10 ohm resistor. The current is 4.5 ampere. The internal resistance ofthe battery is
  • Zero
  • 0.5 ohm
  • 1.1 ohm
  • 5.0 ohm
The potential difference in open circuit for a cell is 2.2 volt. When a 4 ohm resistor is connected between its two electrodes the potential difference becomes 2 volt. The internal resistance of the cell will be
  • 1 ohm
  • 0.2 ohm
  • 2.5 ohm
  • 0.4 ohm
A new flashlight cell of e.m.f. 1.5 volt gives a current of 15 amp, when connected directly to an ammeter of resistance 0.04 52 . The internal resistance of cell is
  • 0.04 Ω
  • 0.06 Ω
  • 0.10 Ω
  • 10 Ω
A cell whose e.m.f. is 2 V and internal resistance is 0.1 Ω a, is connected with a resistance of 3.9 Ω. The voltage across the cell terminal will be
  • 0.50 V
  • 1.90 V
  • 1.95 V
  • 2.00 V
The reading of a high resistance voltmeter when a cell is connected across it is 2.2 V. When the terminals of the cell are also connected to a resistance of 5Ω the voltmeter reading drops to 1.8 V. Find the internalresistance of the cell
  • 1.2 Ω
  • 1.3Ω
  • 1.1 Ω
  • 1.4 Ω
n identical cells each of e.m.f. E and internal resistance r are connected in series. An external resistance R is connected in series to this combination. The currentthrough R is

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  • 2)
    Physics-Current Electricity I-66004.png

  • Physics-Current Electricity I-66005.png

  • Physics-Current Electricity I-66006.png
0:0:1


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