JEE Questions for Physics Current Electricity I Quiz 11 - MCQExams.com

For driving a current of 2 A for 6 minutes in a circuit, 1000 J of work is to be done. The e.m.f. of the source in the circuit is
  • 1.38 V
  • 1.68 V
  • 2.04 V
  • 3.10 V
Two batteries of e.m.f. 4 V and 8 V with internal resistances 1 Ω and 2 Ω are connected in a circuit with a resistance of 9 Ω as shown in figure. The current and potential difference between the points P and Q are
Physics-Current Electricity I-65231.png

  • Physics-Current Electricity I-65232.png
  • 2)
    Physics-Current Electricity I-65233.png

  • Physics-Current Electricity I-65234.png

  • Physics-Current Electricity I-65235.png
In the shown circuit, what is the potential difference across A and B?
Physics-Current Electricity I-65237.png
  • 50 V
  • 45 V
  • 30 V
  • 20 V
Two cells having e.m.f. 4V, 2V and internal resistances 1 Ω, 1 Ω are connected as shown in figure. Current through 6 Ω resistance is
Physics-Current Electricity I-65238.png
  • 1/3 A
  • 2/3 A
  • 1 A
  • 2/9 A
Electromotive force is the force, which is able to maintain a constant
  • Current
  • Resistance
  • Power
  • Potential difference
A cell of e.m.f 6 V and resistance 0.5 ohm is short circuited. The current in the cell is
  • 3 amp
  • 12 amp
  • 24 amp
  • 6 amp
A storage cell is charged by 5 amp D.C. for 18 hours. Its strength after charging will be
  • 18 AH
  • 5 AH
  • 90 AH
  • 15 AH
In the given circuit the current I1 is
Physics-Current Electricity I-65242.png
  • 0.4 A
  • – 0.4 A
  • 0.8 A
  • – 0.8 A
A current of 2.0 ampere passes through a cell of e.m.f. 1.5 volt having internal resistance of 0.15 ohm. The potential difference measured, in volt, across both the ends of the cell will be
  • 1.35
  • 1.50
  • 1.00
  • 1.20
A battery has e.m.f. 4 V and internal resistance r. When this battery is connected to an external resistance of 2 ohm, a current of 1 amp. flows in the circuit. How much current will flow if the terminals of the battery are connected directly ?
  • 1 amp
  • 2 amp
  • 4 amp
  • Infinite
Two batteries A and B each of e.m.f. 2 V are connected in series to an external resistance R =1 ohm. If the internal resistance of battery A is 1.9 ohm and that of B is 0.9 ohm, what is the potential difference between the terminals of battery A?
Physics-Current Electricity I-65246.png
  • 2 V
  • 3.8 V
  • Zero
  • None of the above
When a resistor of 11 Ω is connected in series with an electric cell, the current flowing in it is 0.5 A. Instead, when a resistor of 5 Ω is connected to the same electric cell in series, the current increases by 0.4 A. The internal resistance of the cell is
  • 1.5 Ω
  • 2Ω
  • 2.5Ω
  • 3.5Ω
Consider four circuits shown in the figure below. In which circuit power dissipated is greatest (Neglect the internal resistance of the power supply)

  • Physics-Current Electricity I-65249.png
  • 2)
    Physics-Current Electricity I-65250.png

  • Physics-Current Electricity I-65251.png

  • Physics-Current Electricity I-65252.png
A cell of constant e.m.f. is first connected to a resistance R1 and then connected to a resistance R2. If power delivered in both cases is equal, then the internal resistance of the cell is

  • Physics-Current Electricity I-65254.png
  • 2)
    Physics-Current Electricity I-65255.png

  • Physics-Current Electricity I-65256.png

  • Physics-Current Electricity I-65257.png
The n rows each containing m cells in series are joined in parallel. Maximum current is taken from this combination across an external resistance of 3 Ω resistance. If the total number of cells used are 24 and internal resistance of each cell is 0.5 Ω then
  • m = 8, n = 3
  • m = 6, n = 4
  • m = 12, n = 2
  • m = 2, n = 12
The figure shows a network of currents. The magnitude of currents is shown here. The current I will be
Physics-Current Electricity I-65260.png
  • 3 A
  • 9 A
  • 13 A
  • 19 A
The maximum power drawn out of the cell from a source is given by (where r is internal resistance)
  • E2/2r
  • E2/4r
  • E2/r
  • E2/3r
Find out the value of current through 2 Ω resistance for the given circuit
Physics-Current Electricity I-65263.png
  • 5 A
  • 2 A
  • Zero
  • 4 A
An energy source will supply a constant current into the load if its internal resistance is
  • Zero
  • Non-zero but less than the resistance of the load
  • Equal to the resistance of the load
  • Very large as compared to the load resistance
The magnitude of i in ampere unit is
Physics-Current Electricity I-65265.png
  • 0.1
  • 0.3
  • 0.6
  • None of the above
A battery of e.m.f. E has an internal resistance ‘r’. A variable resistance R is connected to the terminals of the battery. A current I is drawn from the battery. V is the terminal P.D. If R alone is gradually reduced to zero, which of the following best describes I and V ?
  • I approaches zero, V approaches E
  • I approaches E/r, V approaches zero
  • I approaches E/r, V approaches E
  • I approaches infinity, V approaches E
In the circuit given here, the points A, B and C are 70 V, zero, 10 V respectively. Then
Physics-Current Electricity I-65268.png
  • The point D will be at a potential of 60 V
  • The point D will be at a potential of 20 V
  • Currents in the paths AD, DB and DC are in the ratio of 1 : 2 : 3
  • Currents in the paths AD, DB and DC are in the ratio of 3 : 2 : 1
5 cells, each of e.m.f 0.2V and internal resistance 1 Ω are connected to an external circuit of resistance of 10 Ω. Find the current through external circuit.

  • Physics-Current Electricity I-65270.png
  • 2)
    Physics-Current Electricity I-65271.png

  • Physics-Current Electricity I-65272.png

  • Physics-Current Electricity I-65273.png
In the circuit shown, the current through the 5 Ω. resistor is
Physics-Current Electricity I-65275.png

  • Physics-Current Electricity I-65276.png
  • 2)
    Physics-Current Electricity I-65277.png

  • Physics-Current Electricity I-65278.png

  • Physics-Current Electricity I-65279.png
In meter bridge or Wheatstone bridge for measurement of resistance, the known and the unknown resistances are interchanged. The error so removed is
  • End correction
  • Index error
  • Due to temperature effect
  • Random error
50 Ω and 100 Ω resistors are connected in series. This connection is connected with a battery of 2.4 volt. When a voltmeter of 100 Ω resistance is connected across 100 Ωresistor, then the reading of the voltmeter will be
  • 1.6 V
  • 1.0 V
  • 1.2 V
  • 2.0 V
A 2 volt battery, a 15 Ω resistor and a potentiometer of 100 cm length, all are connected in series. If the resistance of potentiometer wire is 5Ω, then the potential gradient of the potentiometer wire is
  • 0.005 V/cm
  • 0.05 V/cm
  • 0.02 V/cm
  • 0.2 V/cm
An ammeter gives full scale deflection when current of 1.0 A is passed in it. To convert it into 10 A range ammeter, the ratio of its resistance and the shunt resistance will be
  • 1 : 9
  • 1 : 10
  • 1 : 11
  • 9 : 1
The accurate measurement of e.m.f can be obtained using
  • Multimeter
  • Voltmeter
  • Voltameter
  • Potentiometer
In order to pass 10% of main current through a moving coil galvanometer of 99 ohm, the resistance of the required shunt is
  • 9.9 Ω
  • 10 Ω
  • 11 Ω
  • 9 Ω
The potential gradient along the length of a uniform wire is 10 volt/metre . B and C are the two points at 30 cm and 60 cm point on a meter scale fitted along the wire. The potential difference between B and C will be
  • 3 volt
  • 0.4 volt
  • 7 volt
  • 4 volt
Shown in the figure below is a meter-bridge set up with null deflection in the galvanometer.
Physics-Current Electricity I-65286.png
  • 220 Ω
  • 110 Ω
  • 55 Ω
  • 13.75 Ω
The tangent galvanometer, when connected in series with a standard resistance can be used as
  • An ammeter
  • A voltmeter
  • A wattmeter
  • Both ammeter and voltmeter
In Wheatstone\'s bridge P = 9 ohm, Q = 11 ohm, R = 4 ohm and S = 6 ohm. How much resistance must be put in parallel to the resistance S to balance the bridge?
  • 24 Ω
  • 2)
    Physics-Current Electricity I-65288.png
  • 26.4 Ω
  • 18.7 Ω
A Daniel cell is balanced on 125 cm length of a potentiometer wire. Now the cell is short-circuited by a resistance 2 ohm and the balance is obtained at 100 cm. The internal resistance of the Daniel cell is
  • 0.5 ohm
  • 1.5 ohm
  • 1.25 ohm
  • 4/5 ohm
Sensitivity of potentiometer can be increased by
  • Increasing the e.m.f. of the cell
  • Increasing the length of the potentiometer wire
  • Decreasing the length of the potentiometer wire
  • None of the above
Two resistance R1 and another R2of the same material but twice the length and half the thickness are connected in series with a standard battery E of internal resistance r. The balancing point is

  • Physics-Current Electricity I-65292.png
  • 2)
    Physics-Current Electricity I-65293.png

  • Physics-Current Electricity I-65294.png

  • Physics-Current Electricity I-65295.png
Potential gradient is defined as
  • Fall of potential per unit length of the wire
  • Fall of potential per unit area of the wire
  • Fall of potential between two ends of the wire
  • Potential at any one end of the wire
In an experiment of meter bridge, a null point is obtained at the centre of the bridge wire. When a resistance of 10 ohm is connected in one gap, the value of resistance in other gap is
  • 10 Ω
  • 5 Ω

  • Physics-Current Electricity I-65298.png
  • 500 Ω
In potentiometer a balance point is obtained, when
  • The e.m.f. of the battery becomes equal to the e.m.f. of the experimental cell
  • The p.d. of the wire between the +ve end to jockey becomes equal to the e.m.f. of the experimental cell
  • The p.d. of the wire between +ve point and jockey becomes equal to the e.m.f. of the battery
  • The p.d. across the potentiometer wire becomes equal to the e.m.f. of the battery
A milliammeter of range 10 mA has a coil of resistance 1 Ω. To use it as voltmeter of range 10 volt, the resistance that must be connected in series with it, will be
  • 999 Ω
  • 99 Ω
  • 1000 Ω
  • None of these
The resistance of a galvanometer is 50 Ω and it shows full scale deflection for a current of 1 mA. To convert it into a voltmeter to measure 1 V and as well as 10 V (refer circuit diagram) the resistances R1 and R2 respectively are
Physics-Current Electricity I-65300.png
  • 950 Ω and 9150 Ω
  • 900 Ω and 9950 Ω
  • 900 Ω and 9900 Ω
  • 950 Ω and 9000 Ω
  • 950 Ω and 9950 Ω
The resistance of a galvanometer is 90 ohm. If only 10 percent of the main current may flow through the galvanometer, in which way and of what value, a resistor is to be used?
  • 10 ohm in series
  • 10 ohm in parallel
  • 810 ohm in series
  • 810 ohm in parallel
Which of the following statements is wrong?
  • Voltmeter should have high resistance
  • Ammeter should have low resistance
  • Ammeter is placed in parallel across the conductor in a circuit
  • Voltmeter is placed in parallel across the conductor in a circuit
In the diagram shown, the reading of voltmeter is 20 V and that of ammeter is 4 A. The value of R should be (Consider given ammeter and voltmeter are not ideal)
Physics-Current Electricity I-65303.png
  • Equal to 5 Ω
  • Greater than 5 Ω
  • Less than 5 Ω
  • Greater or less than 5 Ω depending on the material of R
A galvanometer of resistance 20 Ω shows a deflection of 10 divisions when a current of 1 mA is passed through it. If a shunt of 4 Ω is connected and there are 50 divisions on the scale, the range of the galvanometer is
  • 1 A
  • 3 A
  • 30 mA
  • 30 A
In a potentiometer circuit there is a cell of e.m.f. 2 volt, a resistance of 5 ohm and a wire of uniform thickness of length 1000 cm and resistance 15 ohm. The potential gradient in the wire is

  • Physics-Current Electricity I-65306.png
  • 2)
    Physics-Current Electricity I-65307.png

  • Physics-Current Electricity I-65308.png

  • Physics-Current Electricity I-65309.png
A potentiometer wire, 10 m long, has a resistance of 40 Ω. It is connected in series with a resistance box and a 2V storage cell. If the potential gradient along the wire is (0.1 mV/cm), the resistance unplugged in the box is
  • 260 Ω
  • 760 Ω
  • 960 Ω
  • 1060 Ω
A voltmeter having a resistance of 998 ohm is connected to a cell of e.m.f. 2 volt and internal resistance 2 ohm. The error in the measurement of e.m.f. will be
  • 4 × 10–1 volt
  • 2 × 10–3 volt
  • 4 × 10–3 volt
  • 2 × 10–1 volt
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 e.m.f. of the standard cell is larger than the e.m.f.'s of the two cells
  • The diameter of the wires is the same and uniform throughout
  • The number of wires is ten
  • The e.m.f. of the standard cell is smaller than the e.m.f.'s of the two cells
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