JEE Questions for Physics Current Electricity I Quiz 3 - MCQExams.com

A battery is charged at a potential of 15 V in 8 h, when the current flowing is 10 A. The battery on discharge supplies a current of 5A for 15 h. The mean terminal voltage during discharge is 14V. The watt hour efficiency of battery is
  • 80%
  • 90%
  • 87.5%
  • 82.5%
The potential difference across the terminals of a battery is 50 V when 11 A current is drawn and 60 V, when 1 A current is drawn. The einf and the internal resistance of the battery are
  • 62 V, 2Ω
  • 63 V, 1Ω
  • 61 V, 1Ω
  • 64 V, 2Ω
Two resistors of resistance 2Ω and 6Ω are connected is parallel. This combination is then connected to a battery of emf 2V and internal resistance 0.5Ω . What is the current flowing through the battery?
  • 4 A
  • 4/3 A
  • 4/17 A
  • 1 A
In the circuit shown, the value of I in ampere is
Physics-Current Electricity I-64558.png
  • 1.00 Ω
  • 5.00 Ω
  • 11.00 Ω
  • 60.00 Ω
A battery of emf 2.0 V and internal resistance 0.10 Ω is being charged with a current of 5.0 A. The potential difference between the terminals of the battery is
Physics-Current Electricity I-64560.png
  • 2.0 V
  • 2.5 V
  • 1.5 V
  • zero
A cell having emf of 1.5 V, when connected across a resistance of 14 Ω, produces a voltage of only 1.4 V across this resistance. The internal resistance of the cell must be
  • 1 Ω
  • 14 Ω
  • 15 Ω
  • 21 Ω
Two cells with the same emf E and different internal resistances r1 and r2 are connected in series to an external resistance R. The value of R so, that the potential difference

  • Physics-Current Electricity I-64563.png
  • 2)
    Physics-Current Electricity I-64564.png

  • Physics-Current Electricity I-64565.png

  • Physics-Current Electricity I-64566.png
Two similar cells, whether joined in series or in parallel, have the same current through an external resistance of 2Ω. The internal resistance of each cell is
  • 1Ω
  • 2Ω
  • 0.5Ω
  • 1.5Ω
A voltmeter of range 2 V and resistance 300Ω cannot be converted into ammeter of range
  • 1 A
  • 1 mA
  • 100 mA
  • 10 mA
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-64571.png
  • 3 A away from x
  • 1 A away from x
  • 4 A away from x
  • 1 A towards x
A 5 V battery with internal resistance 2 Ω and a 2 V battery with internal resistance 1 Ω are connected to a 10 Ω resistor as shown in the figure. The current in the 10Ω resistor is
Physics-Current Electricity I-64572.png
  • 0.27 A, P2 to P1
  • 0.03 A, P1 to P2
  • 0.03 A, P2 to P1
  • 0.27 A, P1 to P2
When a battery connected across a resistor of 16 Ω, the voltage across the resistor is 12V. When the same battery is connected across a resistor of 10 Ω, voltage across it is 11 V. The internal resistance of the battery (in ohm) is

  • Physics-Current Electricity I-64574.png
  • 2)
    Physics-Current Electricity I-64575.png

  • Physics-Current Electricity I-64576.png

  • Physics-Current Electricity I-64577.png
Two cells having the internal resistance 0.2Ω and 0.4Ω are connected in parallel. The voltage across the battery terminal is 1.5 V. The emf of first cell is 1.2 V. The emf of second cell is
  • 2.7 V
  • 2.1 V
  • 3 V
  • 4.2 V
The potential difference between A and B in the following figure is
Physics-Current Electricity I-64580.png
  • 32 V
  • 48 V
  • 24 V
  • 14 V
A battery of emf E and internal resistance r is connected to an external resistance R the condition for maximum power transfer is
  • r < R
  • r > R
  • r = 1/R
  • r = R
A battery of emf 10V and internal resistance 3Ω is connected to a resistor. The current in the circuit is 0.5A. The terminal voltage of the battery when the circuit is closed is
  • 10 V
  • zero
  • 1.5 V
  • 8.5 V
In the electrical network shown in the figure, the potential difference across 3Ω resistance will be
Physics-Current Electricity I-64583.png
  • 12 V
  • 2.4 V
  • 24 V
  • 36 V
Is it possible that any battery has some constant value of emf, but the potential difference between the plates is zero?
  • Not possible
  • Yes, if another identical battery is joined in series
  • Yes, if another identical battery is joined in opposition
  • Yes, possible, if another similar battery is joined in parallel
To get maximum current through a resistance of 2.5 Ω, one can use m rows of cells, each row having n cells. The internal resistance of each cell is 0.5 Ω. What are the values of n and m, if the total number of cells is 45?
  • m = 3, n = 15
  • m = 5, n = 9
  • m = 9, n = 5
  • m = 15, n = 3
Two identical cells send the same current in 3 Ω resistance, whether connected in series or in parallel. The internal resistance on the cell should be
  • 1Ω
  • 3Ω
  • 1/2 Ω
  • 3.5 Ω
  • 3/2 Ω
A battery has an emf of 15 V and internal resistance of 1Ω. Is the terminal to terminal potential difference less than, equal to or greater than 15 V if the current in the battery is (from negative to positive terminal, (from positive to negative terminal (zero current?
  • Less, greater, equal
  • Less, less, equal
  • Greater, greater, equal
  • Greater, less, equal
In the given circuit shown, below the internal resistance of the cell is negligible. The steady state current in the 2Ω resistor is
Physics-Current Electricity I-64588.png
  • 0.6 A
  • 1.2 A
  • 0.9 A
  • 1.5 A
One end each of a resistance r, capacitor C and resistance 2r are connected together. The other ends are respectively connected to the positive terminals of batteries, P, Q, R having respectively emf's E,E and 2E. The negative terminals of the batteries are then connected together. In this circuit, with steady current the potential drop across the capacitor is

  • Physics-Current Electricity I-64590.png
  • 2)
    Physics-Current Electricity I-64591.png

  • Physics-Current Electricity I-64592.png
  • E
The current in a simple series circuit is 5.0 A, When an additional resistance of 2.0 Ω is inserted, the current drops to 4.0 A. The original resistance of the circuit in ohm was
  • 1.25
  • 8
  • 10
  • 20
A battery of emf 2 V and internal resistance 0.1Ω is being charged by a current of 5 A. The potential difference between the terminals of the battery is
  • 2.5 V
  • 1.5 V
  • 0.5 V
  • 1 V
An energy source will supply a constant current into, the load, if its internal resistance is
  • equal to the resistance of the load
  • very large as compared to the load resistance
  • zero
  • non-zero but less than the resistance of the load
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 3Ω 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 current is shown below.The current I will be
Physics-Current Electricity I-64596.png
  • 3 A
  • 9 A
  • 13 A
  • 19 A
A galvanometer has current range of 15 mA and voltage range 750 mV. To convert this galvanometer into an ammeter of range 25 A, the required shunt is
  • 0.8Ω
  • 0.93Ω
  • 0.03Ω
  • 2.0Ω
The daniel cell is balanced on 125 cm length of a potentiometer. Now, the cell is short circuited by a resistance of 20 and the balance is obtained at 100 cm. The internal resistance of the daniel cell is

  • Physics-Current Electricity I-64599.png
  • 1.5Ω
  • 1.25Ω
  • 0.5Ω
An ammeter and a voltmeter of resistance R are connected in series to an electric cell of negligible internal rsistance. Their reading are A and V respectively. If another resistance R is connected in parallel with the voltmeter, then
  • both A and V increase
  • both A and V will decrease
  • A will decrease and V will increase
  • A will increase andV will decrease
In a potentiometer of a cell of emf 1.25 V gives balancing length of 30 cm.If the cell is replaced by another cell, balancing length is found to be 40 cm. What is the emf of second cell?
  • ≃ 1.57 V
  • ≃ 1.67 V
  • ≃ 1.47 V
  • ≃ 1.37 V
What is the value of shunt resistance required to convert a galvanometer of resistance 100Ω into an ammeter of range 1 A? Given, full scale deflection of the galvanometer is 5mA

  • Physics-Current Electricity I-64602.png
  • 2)
    Physics-Current Electricity I-64603.png
  • 0.5 Ω
  • 0.05 Ω
A galvanometer having internal resistence 10 Ω requires 0.01 A for a full scale deflection. To convert this galvanometer to a voltmeter of full scale deflection at 120 V, we need to connect a resistance of
  • 11990 Ω in series
  • 11990 Ω in parallel
  • 12010 Ω in series
  • 12010 Ω in parallel
The neutral point on potentiometer's scale for two cells of emf 2.1 and E volt is observed at distances 40 cm and 56 cm respectively. The value of E is
  • 2.10 V
  • 2.94 V
  • 1.50 V
  • 1.20 V
A voltmeter has resistance of G ohms and range V volt. The value of resistance used in series to convert it into a voltmeter of range n V volts is
  • nG
  • (n – 1)G

  • Physics-Current Electricity I-64607.png

  • Physics-Current Electricity I-64608.png
The current in the primary circuit of a potentiometer is 0.2 A. The specific resistance and cross-section of the potentiometer wire are 4 × 10-7 Ω-m and 8 × 10-7 m2 espectively. The potential gradient will be equal to
  • 0.2 V/m
  • 1 V/m
  • 0.3 V/m
  • 0.1 V/m
The deflection in a moving coil galvanometer is reduced to half when it is shunted with a 40 Ω coil. The resistance of the galvanometer is
  • 15Ω
  • 20Ω
  • 40Ω
  • 80Ω
In a potentiometer experiment the balancing with a cell is at length 240 cm. On shunting the cell with a resistance of 2 Ω, the balancing length becomes 120 cm.The internal resistance of the cell is
  • 4Ω
  • 2Ω
  • 1Ω
  • 0.5Ω
For measurement of potential difference, potentiometer is preferred in comparison to voltmeter because
  • potentiometer is more sensitive than voltmeter
  • the resistance of potentiometer is less than voltmeter
  • potentiometer is cheaper than voltmeter
  • potentiometer does not take current from the circuit
The range of a voltmeter of resistance 500 Ω is 10 V. The resistance to be connected to convert it into an ammeter of range 10 A is
  • 1 Ω in parallel
  • 1 Ω in series
  • 0.1 Ω in parallel
  • 0.1 Ω in series
Three voltmeters A, B and C having resistances R, 1.5 R and 3R respectively are used in a circuit as shown. When a potential difference is applied between X and Y, the readings of the voltmeters are V1 , V2 and V3 respectively. Then,
Physics-Current Electricity I-64615.png
  • V1 = V2 = V3
  • V1 < V2 = V3
  • V1 > V2 > V3
  • V1 > V2 = V3
A 36 Ω galvanometer is shunted by resistance of 4 Ω. The percentage of the total current, which passes through the galvanometer is
  • 8%
  • 9%
  • 10%
  • 91%
The accurate measurement of emf can be obtained using
  • multimeter
  • voltmeter
  • voltameter
  • potentiometer
A galvanometer of resistance 240 Ω allows only 4% of the main current after connecting a shunt resistance. The value of the shunt resistance is
  • 10 Ω
  • 20 Ω
  • 8 Ω
  • 5 Ω
A potentiometer wire of length 10 m and resistance 20 Ω is connected in series with a 15 V battery and an external resistance 40 Ω. A secondary cell of emf E in the secondary circuit is balanced by 240 cm long potentiometer wire. The emf E of the cell is
  • 2.4 V
  • 1.2 V
  • 2.0 V
  • 3 V
  • 6 V
A galvanometer can be converted into a voltmeter by connecting
  • low resistance in parallel
  • low resistance in series
  • high resistance in parallel
  • high resistance in series
A galvanometer of resistance 25 Ω measures 10-3 A. Shunt required to increase range upto 2 A is
  • 12.5 Ω
  • 0.0125 Ω
  • 0.125 Ω
  • 1.25 Ω
By mistake a voltmeter is connected in series and an ammeter is connected in parallel with a resistance in an electrical circuit. What will happen to the instruments ?
  • Voltmeter is damaged
  • Ammeter is damaged
  • Both are damaged
  • None is damaged
In order to increase the sensitivity of galvanometer
  • the suspension wire should be made stiff
  • area of the coil should be reduced
  • the magnetic field should be increased
  • the number of turns in the coil should be reduced
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