JEE Questions for Physics Current Electricity I Quiz 2 - MCQExams.com

A rod of a certain metal is 1.0 m long and 0.6 cm in diameter. Its resistance is 3.0 × 10-3 Ω. Another disc made of the same metal is 2.0 cm in diameter and 1.0 mm thick. What is the resistance between the round faces of the disc?
  • 1.35 × 10-8 Ω
  • 2.70 × 10-7 Ω
  • 4.05 × 10-6 Ω
  • 8.10 × 10-5 Ω
The current i in the circuit (see Fig) is
Physics-Current Electricity I-64447.png

  • Physics-Current Electricity I-64448.png
  • 2)
    Physics-Current Electricity I-64449.png

  • Physics-Current Electricity I-64450.png

  • Physics-Current Electricity I-64451.png
In a closed circuit, the current I (in ampere) at an instant of time t (in sec) is given by I = 4 – 0.08 t. The number of electrons flowing in 50 s through the cross-section of the conductor is
  • 1.25 × 1019
  • 6.25 × 1020
  • 5.25 × 1019
  • 2.55 × 1020
  • 4.25 × 1019
When a current I flows through a wire, the drift velocity of the electrons is v. When current 2I flows through another wire of the same material having double the length and double the area of cross-section, the drift velocity of the electrons will be

  • Physics-Current Electricity I-64454.png
  • 2)
    Physics-Current Electricity I-64455.png

  • Physics-Current Electricity I-64456.png

  • Physics-Current Electricity I-64457.png

  • Physics-Current Electricity I-64458.png

Physics-Current Electricity I-64460.png
  • independent of temperature
  • increases as the temperature rises
  • decreases as the temperature rises
  • increases or decreases as temperature rises depending upon the metal
If the electric current through an electric bulb is 3.2 A, the number of electrons flow through, it in one second is
  • 2 × 109
  • 2 × 1019
  • 3.2 × 1019
  • 1.6 × 1018
A wire P has a resistance of 20Ω. Another wire Q of same material but length twice that of P has resistance of 8Ω. If r is the radius of cross-section of P, the radius of cross-section of Q is
  • r
  • 2)
    Physics-Current Electricity I-64463.png

  • Physics-Current Electricity I-64464.png
  • 2r
Two copper wires of lengths land 2/ have radii r and 2r respectively. What is ratio of their specific resistances?
  • 1 : 2
  • 2 : 1
  • 1 : 1
  • 1 : 3
A certain electrical conductor has a square cross-section, 2.0 mm on side, and is 12 m long. The resistance between its ends is 0.072 Ω.
The resistivity of its material is equal to
  • 2.4 × 10-6 Ω - m
  • 2.2 × 10-6 Ω - m
  • 1.2 × 10-8 Ω - m
  • 2.4 × 10-8 Ω - m
Assume that, each atom of copper contributes one electron. If the current flowing through a copper wire of 1 mm diameter is 1.1A, the drift velocity of electrons will be (density of Cu = 9 g cm-3, atomic weight of Cu= 63).
  • 0.3 mm s-1
  • 0.5 mm s-1
  • 0.1 mm s-1
  • 0.2 mm s-1
A resistor of 6 k Ω with tolerance 10% and another resistance of 4kΩ with tolerance 10% are connected in series. The tolerance of the combination is about
  • 5%
  • 10%
  • 12%
  • 15%
The equivalent resistance of two resistors connected in series 6Ω and their parallel equivalent resistance is 4/3Ω. What are the value of resistance?
  • 4Ω, 6Ω
  • 8Ω, 1Ω
  • 4Ω, 2Ω
  • 6Ω, 2Ω
In an experiment the values of two resistances are R1 = (5.0 ± 0.2)Ω and R2 = (10.0 ± 0.1)Ω. The total resistances, when they are connected in parallel is
  • 3.3 ± 7%
  • 3.3 ± 5%
  • 3.3 ± 0.3%
  • 2.5 ± 7%
In a circuit, 3 resistors of resistance 1.2 Ω , 2Ω , 3Ω are connected in parallel. The value of equivalent resistance is
  • less than 1.2Ω
  • greater than 1.2Ω
  • between 1.2Ω and 2Ω
  • between 2Ω and 3Ω
In the Wheatstone's network given, P =10Ω, Q = 20Ω, R =15Ω, S = 30Ω, the current passing through the battery (of negligible internal resistance) is
Physics-Current Electricity I-64472.png
  • 0.36 A
  • zero
  • 0.18 A
  • 0.72 A
Find the equivalent resistance of the network between points a and b?
Physics-Current Electricity I-64474.png
  • r
  • 2)
    Physics-Current Electricity I-64475.png
  • 3r

  • Physics-Current Electricity I-64476.png
In a typical Wheatstone network the resistances in cyclic order are A =10Ω , B = 5Ω , C = 4Ω and D = 4Ω for the bridge to be balanced
Physics-Current Electricity I-64478.png
  • 10Ω should he conneci,A in parallel with A
  • 10Ω should be connected in series with A
  • 5Ω should he connected in series with
  • 5Ω should be connected in parallel with B
Five resistance are connected as shown in the figure. The equivalent resistance between P and Q will be
Physics-Current Electricity I-64480.png

  • Physics-Current Electricity I-64481.png
  • 2)
    Physics-Current Electricity I-64482.png

  • Physics-Current Electricity I-64483.png
  • None of these
A Wheatstone bridge has the resistances 10Ω, 10Ω, 10Ω and 30Ω in its four arms. What resistance joined in parallel to the 30Ω resistance will bring it to be balanced condition?
  • 2Ω
  • 5Ω
  • 10Ω
  • 15Ω
The effective resistance between points A and B is
Physics-Current Electricity I-64486.png
  • 4r
  • r/4
  • r/2
  • 3r/4
If 400 Ω of resistance is made by adding four 100 Ω resistance of tolerance 5%, then the tolerance of the combination is
  • 20%
  • 55
  • 10%
  • 15%
Combination of two identical capacitors, a resistor R and a DC voltage source of voltage 6 V is used in an experiment on C-R circuit. It is found that for a parallel combination of the capacitor the time in which the voltage of the fully charged combination reduces to half its original voltage is 10 s. For series combination the time needed for reducing the voltage of the fully charged series combination by half is
  • 200 s
  • 10 s
  • 5 s
  • 2.5 s
In the circuit shown, the currents i1 and i2 are
Physics-Current Electricity I-64490.png
  • i1 = 3A, i2 = 1A
  • i1 = 1A, i2 = 3A
  • i1 = 0.5A, i2 = 1.5A
  • i1 = 1.5A, i2 = 0.5A
The charge on the capacitor of capacitance C shown in the figure below will be
Physics-Current Electricity I-64492.png
  • CE
  • 2)
    Physics-Current Electricity I-64493.png

  • Physics-Current Electricity I-64494.png

  • Physics-Current Electricity I-64495.png
Five equal resistance, each of resistance R, are connected as shown in figure below. A battery of V volt is connected between A and B. The current flowing m FC will be
Physics-Current Electricity I-64497.png

  • Physics-Current Electricity I-64498.png
  • 2)
    Physics-Current Electricity I-64499.png

  • Physics-Current Electricity I-64500.png

  • Physics-Current Electricity I-64501.png
The equivalent resistance between A and B in the given circuit is
Physics-Current Electricity I-64503.png
  • 3 Ω
  • 6 Ω
  • 12 Ω
  • 1.5 Ω
What is the equivalent resistance between A and B in the given circuit?
Physics-Current Electricity I-64505.png
  • 4 Ω
  • 2 Ω

  • Physics-Current Electricity I-64506.png

  • Physics-Current Electricity I-64507.png
The total current supplied to the given circuit by the battery is
Physics-Current Electricity I-64509.png
  • 9 A
  • 6 A
  • 2 A
  • 4 A
Three resistors 1 Ω, 2 Ω and 3 Ω are connected to form a triangle. Across 3 Ω resistor a 3 V battery is connected. The current through 3 Ω resistor is
  • 0.75 A
  • 1 A
  • 2 A
  • 1.5 A
Six resistors, each of value 3 Ω are connected as shown in the figure. A cell of emf 3 V is connected across AB. The effective resistance across AB and the current through the arm AB will be
Physics-Current Electricity I-64512.png
  • o.6 Ω, 1 A
  • 1.5 Ω, 2 A
  • 0.6 Ω, 2 A
  • 1.5 Ω, 1 A
The current in the given circuit is
Physics-Current Electricity I-64569.png
  • 0.3 A
  • 0.4 A
  • 0.1 A
  • 0.2 A
Figure shows a network of eight resistors, each equal to 2 Ω, connected to a 3 V battery of negligible internal resistance. The current I in the circuit is
Physics-Current Electricity I-64514.png
  • 0.25 A
  • 0.50 A
  • 0.75 A
  • 1.0 A
A uniform wire has resistance 24 Ω. It is bent in the form of a circle. The effective resistance between the two end points on any diameter of the circle is
  • 6 Ω
  • 12 Ω
  • 3 Ω
  • 24 Ω
The equivalent resistance between the terminals A and D in the following circuit is
Physics-Current Electricity I-64517.png
  • 10Ω
  • 20Ω
  • 5Ω
  • 30Ω
A current of 2 A flows in an electric circuit as shown in figure. The potential difference (VR – VS ), in volts (VR and VSare potentials at R and S respectively) is
Physics-Current Electricity I-64519.png
  • -4
  • +2
  • +4
  • –2
Three resistances of 4Ω each are connected as shown in the figure. If the point D divides the resistance into two equal halves, the resistance between points A and D will be
Physics-Current Electricity I-64521.png
  • 12Ω
  • 6Ω
  • 3Ω

  • Physics-Current Electricity I-64522.png
The equivalent resistance between points A and B of an infinite network of resistances, each of 1Ω, connected as shown is
Physics-Current Electricity I-64524.png
  • infinite
  • 2Ω

  • Physics-Current Electricity I-64525.png
  • zero
The equivalent resistance between the points A and B will be (each resistance is 15Ω)
Physics-Current Electricity I-64527.png
  • 30Ω
  • 8Ω
  • 10Ω
  • 40Ω
In the adjoining figure the equivalent resistance between A and B is
Physics-Current Electricity I-64529.png
  • 5Ω
  • 8Ω
  • 2.5Ω
  • 6.8Ω
In circuit shown below, the resistances are given in ohm and the battery is assumed ideal with emf equal to 3 V. The voltage across the resistance R4 is
Physics-Current Electricity I-64531.png
  • 0.4 V
  • 0.6 V
  • 1.2 V
  • 1.5 V
In the circuit shown the value of I in ampere is
Physics-Current Electricity I-64533.png
  • 1
  • 0.60
  • 0.4
  • 1.5
In the given circuit the equivalent resistance between the points A and B in ohm is
Physics-Current Electricity I-64535.png
  • 9
  • 11.6
  • 14.5
  • 21.2
In a network as shown in the figure, the potential difference across the resistance 2R is (the cell has an emf of E volt and has no internal resistance)
Physics-Current Electricity I-64537.png
  • 2E
  • 2)
    Physics-Current Electricity I-64538.png

  • Physics-Current Electricity I-64539.png
  • E
Each resistance shown in figure is 251. The equivalent resistance between A and B is
Physics-Current Electricity I-64541.png
  • 2 Ω
  • 4 Ω
  • 8 Ω
  • 1 Ω
A uniform wire of resistance R and length L is cut into four equal parts, each of length LI 4, which are then connected in parallel combination. The effective resistance of the combination will be
  • R
  • 4R

  • Physics-Current Electricity I-64543.png

  • Physics-Current Electricity I-64544.png
Six equal resistances are connected between points P, Q and R as shown in the figure. Then, the net resistance will be maximum between
Physics-Current Electricity I-64546.png
  • P and Q
  • Q and R
  • P and R
  • only two points
In the circuit given E = 6.0 V, R1 = 100Ω, R2 = R3 = 50 Ω, R4 = 75 Ω. The equivalent resistance of the circuit, in ohm, is
Physics-Current Electricity I-64548.png
  • 11.875
  • 26.31
  • 118.75
  • None of the above
By using only two resistance coils singly, in series or in parallel one should be able to obtain resistances of 3, 4, 12 and 16 ohm. The separate resistances of the coil are
  • 3 and 4
  • 4 and 12
  • 12 and 16
  • 16 and 3
The current in the 1 Ω resistor shown in the circuit is
Physics-Current Electricity I-64551.png

  • Physics-Current Electricity I-64552.png
  • 3 A
  • 6 A
  • 2 A
What will be the value of current i in the circuit shown?
Physics-Current Electricity I-64554.png
  • 0.67 A
  • 1 A
  • 0.32 A
  • None of these
0:0:1


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