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Worksheet for Class 12 Physics Chapter 3 Current Electricity
Class 12 Physics students should refer to the following printable worksheet in Pdf for Chapter 3 Current Electricity in Class 12. This test paper with questions and answers for Class 12 will be very useful for exams and help you to score good marks
Class 12 Physics Worksheet for Chapter 3 Current Electricity
Important Questions for NCERT Class 12 Physics Current Electricity
Question. You are given several identical resistances each of value R = 10 W and each capable of carrying a maximum current of one ampere. It is required to make a suitable combination of these resistances of 5 W which can carry a current of 4 ampere. The minimum number of resistances of the type R that will be required for this job is
(a) 4
(b) 10
(c) 8
(d) 20
Answer: C
Question. 40 electric bulbs are connected in series across a 220 V supply. After one bulb is fused the remaining 39 are connected again in series across the same supply. The illumination will be
(a) more with 40 bulbs than with 39
(b) more with 39 bulbs than with 40
(c) equal in both the cases
(d) in the ratio 402 : 392.
Answer: B
Question. The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10 W is
(a) 0.8 W
(b) 1.0 W
(c) 0.2 W
(d) 0.5 W
Answer: D
Question. The internal resistance of a cell of e.m.f. 2 V is 0.1 W.
It is connected to a resistance of 3.9 W. The voltage across the cell will be
(a) 1.95 V
(b) 1.9 V
(c) 0.5 V
(d) 2 V
Answer: A
Question. A wire of radius r has resistance R. If it is stretched to a radius r/2 , its resistance will be :
(a) 16 R
(b) 2 R
(c) 4 R
(d) zero
Answer: A
Question. Electroplating is not provided to be used for "
(a) shinning appearance
(b) protection of metal against corrosion
(c) fine finishing to the surface
(d) hardening the metals
Answer: D
Question. Two filaments of same length are connected first in series then in parallel. For the same amount of main current flowing, the ratio of the heat produced is:
(a) 1 : 2
(b) 4 : 1
(c) 1 : 4
(d) 2 : 1
Answer: D
Question. The cell has an emf of 2V and the internal resistance of this cell is 0.1W, it is connected to a resistance of 3.9W. The voltage across the cell will be :
(a) 1.95 V
(b) 1.5 V
(c) 2 V
(d) 1.8 V
Answer: A
Question. The internal resistance of a cell is the resistance of :
(a) electrolyte used in the cell
(b) electrodes of the cell
(c) vessel of the cell
(d) none of these
Answer: A
Question. An electric bulb marked 40 W and 200V, is used in a circuit of supply voltage 100V. Now its power is
(a) 10 W
(b) 20 W
(c) 40 W
(d) 100 W
Answer: A
Question. The voltage of clouds is 4 × 106 volt with respect to round. In a lighteing strike lasting 100 m sec, a charge of 4 coulombs is delivered to the ground.
The power of lightening strike is :
(a) 160 MW
(b) 80 MW
(c) 20 MW
(d) 500 KW
Answer: A
Question. Four wires of the same diameter are connected in turn between two points, maintained at a constant potential difference. Their resistivities are; r and L (wire 1)., 1.2r and 1.2 L (wire 2), 0.9 r and 0.9L (wire 3) and r and 1.5 L (wire 4). Rank the wires according to the rates at which energy is dissipated as heat, greatest first
(a) 4 > 3 > 1 > 2
(b) 4 > 2 > 1 > 3
(c) 1 > 2 > 3 > 4
(d) 3 > 1 > 2 > 4
Answer: D
Question. The resistance of a galvanometer is 50 W and current required to give full scale deflection is 100 μA in order to convert it into an ammeter for reading upto 10 A. It is necessary to put an resistance of
(a) 3.5 × 10–4 W
(b) 10 × 10–4 W
(c) 2.5 × 10–4 W
(d) 5 × 10–4 W
Answer: D
Question. Electroplating is not provided to be used for
(a) shinning appearance [1998]
(b) protection of metal against corrosion
(c) fine finishing to the surface
(d) hardening the metals
Question. If specific resistance of a potentiometer wire is 10–7 W m and current flow through it is 0.1 amp.,
cross-sectional area of wire is 10–6 m2 then potential gradient will be
(a) 10–2 volt/m
(b) 10–4 volt/m
(c) 10–6 volt/m
(d) 10–8 volt/m.
Question. The potentiometer is best for measuring voltage, as
(a) it has a sensitive galvanometer and gives null deflection
(b) it has wire of high resistance
(c) it measures p.d. like in closed circuit
(d) it measures p.d. like in open circuit.
Question. A potentiometer consists of a wire of length 4 m and resistance 10 W. It is connected to a cell of e.m.f. 2 V. The potential difference per unit length of the wire will be
(a) 5 V/m
(b) 2 V/m
(c) 0.5 V/m
(d) 10 V/m
Question. In the given circuit, as the sliding contact C is moved from A to B
(a) the readings of both the ammeter and the voltmeter remain constant
(b) the reading of both the ammeter and the voltmeter increase
(c) the reading of the ammeter remains constant but that of the voltmeter increases
(d) the reading of the ammeter remains constant but that of the voltmeter decreases
Answer: C
Question. The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10 Ω is
(a) 0.5 Ω
(b) 0.8 Ω
(c) 1.0 Ω
(d) 0.2 Ω
Answer: A
Question. A capacitor of 10m F has a pot. difference of 40 volts across it. If it is discharged in 0.2 second, the average current during discharge is
(a) 2 m A
(b) 4 m A
(c) 1 m A
(d) 0.5 m A
Answer: A
Question. A wire X is half the diameter and half the length of a wire Y of similar material. The ratio of resistance of X to that of Y is
(a) 8 : 1
(b) 4 : 1
(c) 2 : 1
(d) 1 : 1
Answer: C
Question. Potentiometer measures potential more accurately because
(a) it measures potential in open circuit
(b) it uses sensitive galvanometer for null deflection
(c) it uses high resistance potentiometer wire
(d) it measures potential in closed circuit
Answer: A
Question. Two identical fuses are rated at 10 A. If they are joined
(A) in parallel, the combination acts as a fuse of rating 20 A
(B) in parallel, the combination acts as a fuse of rating 5 A
(C) in series, the combination acts as a fuse of rating 10 A
(D) in series, the combination acts as a fuse of rating 20 A
Select the correct options.
(a) A, B
(b) A, C
(c) B, D
(d) B, C, D
Answer: B
Question. A current source drives a current in a coil of resistance R1 for a time t. The same source drives current in another coil of resistance R2 for same time. If heat generated is same, find internal resistance of source.
(a) R1R2/R1 + R2
(b) R1 + R2
(c) zero
(d) √R1R2
Answer: D
Question. In which of the following the power dissipation is proportional to the square of the current ?
(a) Peltier effect
(b) Joule's effect
(c) Thomson effect
(d) None of the above
Answer: B
Question. When current is passed through a junction of two dissimilar metals, heat is evolved or absorbed at the junction. This process is called
(a) Seebeck effect
(b) Joule effect
(c) Petlier effect
(d) Thomson effect
Answer: C
Question. You are given a resistance coil and a battery. In which of the following cases is largest amount of heat generated ?
(a) When the coil is connected to the battery directly
(b) When the coil is divided into two equal parts and both the parts are connected to the battery in parallel
(c) When the coil is divided into four equal parts and all the four parts are connected to the battery in parallel
(d) When only half the coil is connected to the battery
Answer: C
Question. The electric resistance of a certain wire of iron is R. If its length and radius are both doubled, then
(a) the resistance and the specific resistance, will both remain unchanged
(b) the resistance will be doubled and the specific resistance will be halved
(c) the resistance will be halved and the specific resistance will remain unchanged
(d) the resistance will be halved and the specific resistance will be doubled
Answer: C
Question. A given resistor has the following colour scheme of the various strips on it : Brown, black, green and silver. Its value in ohm is
(a) 1.0´104 ±10%
(b) 1.0´105 ±10%
(c) 1.0´106 ±10%
(d) 1.0´107 ±10%
Answer: C
Question. A 12 cm wire is given a shape of a right angled triangle ABC having sides 3 cm, 4 cm and 5 cm as shown in the figure.
The resistance between two ends (AB, BC, CA) of the respective sides are measured one by one by a multi-meter. The resistances will be in the ratio of
(a) 3 : 4 : 5
(b) 9 : 16 : 25
(c) 27 : 32 : 35
(d) 21 : 24 : 25
Answer: C
Question. An electric lamp is marked 60 W, 220 V. The cost of kilo watt hour of electricity is Rs. 1.25. The cost of using this lamp on 220 V for 8 hours is
(a) Re 0.25
(b) Re 0.60
(c) Re 1.20
(d) Re 4.00
Answer: B
Question. A potentiometer consists of a wire of length 4m and resistance 10Ω. It is connected to a cell of e.m.f. 3V. The potential gradient of wire is
(a) 5V/m
(b) 2V/m
(c) 5V/m
(d) 10V/m
Answer: A
Question. If R1 and R2 are respectively the filament resistances of a 200 watt bulb and a 100 watt bulb designed to operate on the same voltage
(a) R1 is two times R2
(b) R2 is two times R1
(c) R2 is four times R1
(d) R1 is four times R2
Answer: B
Question. Two wires A and B of the same material, having radii in the ratio 1 : 2 and carry currents in the ratio 4 : 1. The ratio of drift speed of electrons in A and B is
(a) 16 : 1
(b) 1 : 16
(c) 1 : 4
(d) 4 : 1
Answer: A
Question. Two wires of same metal have the same length but their cross-sections are in the ratio 3 : 1. They are joined in series.
The resistance of the thicker wire is 10 W. The total resistance of the combination is
(a) 5/2 Ω
(b) 40/3 Ω
(c) 40 Ω
(d) 100 Ω
Answer: C
Question. Two electric bulbs whose resistance are in the ratio 1 : 2 are arranged in parallel to a constant voltage source. The powers dissipated in them have the ratio
(a) 1 : 2
(b) 1 : 1
(c) 2 : 1
(d) 1 : 4
Answer: C
Question. A flow of 107 electrons per second in a conducting wire constitutes a current of
(a) 1.6 x 10-26A
(b) 1.6 x 1026A
(c) 1.6 x 10-12A
(d) 1.6 x 1012A
Answer: C
Q.1 The sequence of bands marked on a carbon resistor is red, red. Red silver. What is the value of resistance?
Ans:‐ 22×102±10%
Q.2 . A wire is cut into half. What is the effect on its specific resistance?
Ans :‐ No effect.
Q.3 :‐ Why do we prefer a potentiometer with a longer bridge wire?
Ans:‐ When the bridge wire is longer the potential gradient is smaller. Smaller the potential gradient more is the sensitivity of potentiometer wire.
Q.4 What are the factors affecting internal resistance of a cell
Ans-Nature of electrolyte Separation between the electrode
Important Questions for NCERT Class 12 Physics Current Electricity
Question. Consider the following two statements.
(A) Kirchhoff’s junction law follows from the conservation of charge.
(B) Kirchhoff’s loop law follows from the conservation of energy.
Which of the following is correct?
(a) Both (A) and (B) are wrong.
(b) (A) is correct and (B) is wrong.
(c) (A) is wrong and (B) is correct.
(d) Both (A) and (B) are correct.
Answer: D
Question. Kirchhoff’s first and second laws of electrical circuits are consequences of
(a) conservation of energy and electric charge respectively
(b) conservation of energy
(c) conservation of electric charge and energy respectively
(d) conservation of electric charge.
Answer: C
Question. Two wires of same metal have the same length but their cross sections are in the ratio 3 : 1.
They are joined in series. The resistance of the thicker wire is 10 W. The total resistance of the combination is
(a) 5/2 W
(b) 40/3 W
(c) 40 W
(d) 100 W
Answer: C
Question. The potentiometer is best for measuring voltage, as
(a) it has a sensitive galvanometer and gives null deflection
(b) it has wire of high resistance
(c) it measures p.d. like in closed circuit
(d) it measures p.d. like in open circuit.
Answer: D
Question. A potentiometer consists of a wire of length 4 m and resistance 10 W. It is connected to a cell of e.m.f. 2 V. The potential difference per unit length of the wire will be
(a) 5 V/m
(b) 2 V/m
(c) 0.5 V/m
(d) 10 V/m
Answer: C
Question. A current of 2 A flows through a 2 W resistor when connected across a battery. The same battery supplies a current of 0.5 A when connected across a 9 W resistor. The internal resistance of the battery is
(a) 0.5 W
(b) 1/3 W
(c) 1/4 W
(d) 1 W
Answer: B
Question. A potentiometer is an accurate and versatile device to make electrical measurements of EMF because the method involves
(a) potential gradients
(b) a condition of no current flow through the galvanometer
(c) a combination of cells, galvanometer and resistances
(d) cells.
Answer: B
Question. A student measures the terminal potential difference (V ) of a cell (of emf 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
(a) –r and e
(b) r and –e
(c) –e and r
(d) e and –r
Answer: A
Question. The resistances of the four arms P, Q, R and S in a Wheatstone’s bridge are 10 ohm, 30 ohm, 30 ohm and 90 ohm, respectively. The e.m.f. and internal resistance of the cell are 7 volt and 5 ohm respectively.
If the galvanometer resistance is 50 ohm, the current drawn from the cell will be
(a) 0.1 A
(b) 2.0 A
(c) 1.0 A
(d) 0.2 A
Answer: D
Question. Three resistances P, Q, R each of 2 W and an unknown resistance S form the four arms of a Wheatstone bridge circuit. When a resistance of 6 W is connected in parallel to S the bridge gets balanced. What is the value of S ?
(a) 3 Ω
(b) 6 Ω
(c) 1 Ω
(d) 2 Ω
Answer: A
Question. A potentiometer wire, 10 m long, has a resistance of 40W. It is connected in series with a resistance box and a 2 V storage cell. If the potential gradient along the wire is 0.1 m V/cm, the resistance unplugged in the box is
(a) 260 W
(b) 760 W
(c) 960 W
(d) 1060 W
Answer: B
Question. Coils in the resistance boxes are made from doubled up insulated wires
(a) to cancel the effect of self induction
(b) to nullify the heating effect
(c) to nullify the Peltier effect
(d) to reduce effective length of the wire
Answer: A
Question. Given a current carrying wire of non-uniform cross-section. Which one of the following is constant throughout the length of wire ?
(a) current only
(b) current and drift speed
(c) drift speed only
(d) current, electric field and drift speed
Answer: B
Question. If specific resistance of a potentiometer wire is 10–7 W m and current flow through it is 0.1 amp., cross-sectional area of wire is 10–6 m2 then potential gradient will be
(a) 10–2 volt/m
(b) 10–4 volt/m
(c) 10–6 volt/m
(d) 10–8 volt/m.
Answer: A
Question. A potentiometer wire has length 4 m and resistance 8 W. The resistance that must be connected in series with the wire and an accumulator of e.m.f. 2 V, so as to get a potential gradient 1 mV per cm on the wire is
(a) 44 W
(b) 48 W
(c) 32 W
(d) 40 W
Question. A potentiometer circuit has been set up for finding the internal resistance of a given cell. The main battery, used across the potentiometer wire, has an emf of 2.0 V and a negligible internal resistance.
The potentiometer wire itself is 4 m long. When the resistance R, connected across the given cell, has values of
(i) infinity
(ii) 9.5 W
the balancing lengths on the potentiometer wire are found to be 3 m and 2.85 m, respectively. The value of internal resistance of the cell is
(a) 0.25 W
(b) 0.95 W
(c) 0.5 W
(d) 0.75 W
Question. A cell can be balanced against 110 cm and 100 cm of potentiometer wire, respectively with and without being short circuited through a resistance of 10 W.
Its internal resistance is
(a) 2.0 ohm
(b) zero
(c) 1.0 ohm
(d) 0.5 ohm
Question. A torch bulb rated as 4.5 W, 1.5 V is connected as shown in fig. The e.m.f. of the cell, needed to make the bulb glow at full intensity is 
(a) 4.5 V
(b) 1.5 V
(c) 2.67 V
(d) 13.5 V
Answer: D
Question. A 100-W bulb and a 25-W bulb are designed for the same voltage. They have filaments of the same length and material. The ratio of the diameter of the 100-W bulb to that of the 25-W bulb is
(a) 4 : 1
(b) 2 : 1
(c) √2 :1
(d) 1 : 2
Answer: B
Question. In a metre bridge, the balancing length from the left end (standard resistance of one ohm is in the right gap) is found to be 20 cm. The value of the unknown resistance is
(a) 0.8 Ω
(b) 0.5 Ω
(c) 0.4 Ω
(d) 0.25 Ω
Answer: D
Question. An electric fan and a heater are marked as 100 W, 220 V and 1000 W, 220 V respectively. The resistance of heater is
(a) equal to that of fan
(b) lesser than that of fan
(c) greater than that of fan
(d) zero
Answer: B
Question. In an electroplating experiment, m g of silver is deposited when 4 A of current flows for 2 minutes. The amount in g of silver deposited by 6 A of current for 40 seconds will be
(a) 4 m
(b) 2 m
(c) m/2
(d) m/4
Answer: C
Question. In the circuit shown below, if the resistance of voltmeter is 4 kW, then the error in the reading of voltmeter will be 
(a) 50%
(b) 68%
(c) 17%
(d) 33.3%
Answer: D
Question. A steady current of 5 A is maintained for 45 minutes. During this time it deposits 4.572 g of zinc at the cathode of voltameter.
E.C.E. of zinc is
(a) 3.387 × 10–4 g/C
(b) 3.387 × 10–4 kg/C
(c) 3.384 × 10–4 kg/C
(d) 3.384 × 10–3 kg/C
Answer: A
Question. In a neon gas discharge tube Ne+ ions moving through a cross-section of the tube each second to the right is 2.9 × 1018, while 1.2 × 1018 electrons move towards left in the same time; the electronic charge being 1.6 × 10–19 C, the net electric current is
(a) 0.27 A to the right
(b) 0.66 A to the right
(c) 0.66 A to the left
(d) zero
Answer: B
Question. Three copper wires of lengths and cross sectional areas are (l, A), (2 l, A/2) and (l/2, 2A). Resistance is minimum in
(a) wire of cross-sectional area A/2
(b) wire of cross-sectional area A
(c) wire of cross-sectional area 2A
(d) same in all the three cases
Answer: C
Question. A 4 ohm resistance wire is bent through 180º at its mid point and the two halves are twisted together. Then the resistance is
(a) 1 Ω
(b) 2 Ω
(c) 5 Ω
(d) 8 Ω
Answer: A
Question. When a current I is set up in a wire of radius r, the drift velocity is vd. If the same current is set up through a wire of radius 2 r, the drift velocity will be
(a) 4 vd
(b) 2 vd
(c) vd/2
(d) vd/4
Answer: D
Question. If nealy 105 coulomb are liberated by 1gm equivalent of aluminium, then amount of aluminium (equivalent weight 9) deposited through electrolysis in 20 minutes by a current of 50 ampere will be :
(a) 0.6 gm.
(b) 0.09 gm
(c) 5.4 gm
(d) 10.8 gm
Answer: C
Question. The amount of charge Q passed in time t through a crosssection of a wire is Q = 5 t2 + 3 t + 1.
The value of current at time t = 5 s is
(a) 9 A
(b) 49 A
(c) 53 A
(d) None of these
Answer: C
Question. Two identical cells connected in series send 1.0A current through a 5 Ω resistor. When they are connected in parallel, they send 0.8 A current through the same resistor. What is the internal resistance of the cell?
(a) 0.5 Ω
(b) 1.0 Ω
(c) 1.5 Ω
(d) 2.5 Ω
Answer: D
Question. If the resistance of a conductor is 5Ω at 50º C & 7Ω at 100º C, then mean temperature coefficient of resistance (of material) is
(a) 0.013/ ºC
(b) 0.004/ ºC
(c) 0.006/ ºC
(d) 0.008/ ºC
Answer: A
Question. If negligibly small current is passed though a wire of length 15 m & resistance of 5Ω, having uniform cross section of 6 × 10–7 m2, then coefficient of resistivity of material is
(a) 1×10–7Ω–m
(b) 2×10–7Ω–m
(c) 3×10–7Ω–m
(d) 4×10–7Ω–m
Answer: B
Question. The resistance of a wire at room temperature 30°C is found to be 10 W. Now to increase the resistance by 10%, the temperature of the wire must be [ The temperature coefficient of resistance of the material of the wire is 0.002 per °C]
(a) 36°C
(b) 83°C
(c) 63°C
(d) 33°C
Answer: B
Question. The resistance of the four arms P, Q, R and S in a Wheatstone’s bridge are 10 ohm, 30 ohm, 30 ohm and 90 ohm, respectively. The e.m.f. and internal resistance of the cell are 7 volt and 5 ohm respectively. If the galvanometer resistance is 50 ohm, the current drawn from the cell will be
(a) 0.2 A
(b) 0.1 A
(c) 2. 0 A
(d) 1. 0 A
Answer: A
Question. The four wires from a larger circuit intersect at junction A as shown. What is the magnitude and direction of the current between points A and B ?
(a) 2 A from A to B
(b) 2A from B to A
(c) 3A from A to B
(d) 2A from B to A
Answer: C
Question. The resistance of the coil of an ammeter is R. The shunt required to increase its range n-fold should have a resistance
(a) R/n
(b) R/n-1
(c) R/n+1
(d) nR
Answer: B
Question. A cell of internal resistance r is connected across an external resistance nr. Then the ratio of the terminal voltage to the emf of the cell is
(a) 1/n
(b) 1/n+1
(c) n/n+1
(d) n-1/n
Answer: C
Question. A battery of e.m.f. 10 V and internal resistance 0.5 W is connected across a variable resistance R. The value of R for which the power delivered in it is maximum is given by
(a) 0.5 Ω
(b) 1.0 Ω
(c) 2.0 Ω
(d) 0.25 Ω
Answer: A
Question. The deflection in a galvanometer decreases from 25 divisions to 5 divisions when a resistor of 20Ω is connected in series.
Find resistance of galvanometer.
(a) 4 Ω
(b) 5 Ω
(c) 6 Ω
(d) 7 Ω
Answer: B
Question. A galvanometer of 50 ohm resistance has 25 divisions. A current of 4 × 10–4 ampere gives a deflection of one division. To convert this galvanometer into a voltmeter having a range of 25 volts, it should be connected with a resistance of
(a) 2450 Ω in series.
(b) 2500 Ω in series.
(c) 245 Ω in series.
(d) 2550 Ω in series.
Answer: A
Question. In the equation AB = C, A is the current density, C is the electric field, Then B is
(a) resistivity
(b) conductivity
(c) potential difference
(d) resistance
Answer: A
1 The resistance of the platinum wire of a platinum resistance thermometer at the ice point is 5Ωand at steam point is 5.23Ωwhen the thermometer is inserted in a hot bath, the resistance of the platinum wire is 5.795Ω. Calculate the temperature of the bath.
2 Find the effective resistance when resistances are connected in series
3 Find the effective resistance when resistances are connected in parallel.
4 Explain why a transformer is required to lower the voltage to a value suitable for use at a station?
5 Derive the expression to find the power dissipated when current I is allowed to flow through a conductor?
6 What is an emf of a cell? Derive an expression to find the current flowing in a circuit in which a resistor R is connected across a cell of emf ε.
7 Derive an expression to find the effective emf of cells in series
8 Derive an expression to find the effective emf of cells in parallel
9 State Kirchhoff’s rules.
10 What is a Wheatstone Bridge? What is the advantage of it?
11 What is a Meter Bridge? Explain with a neat circuit diagram how a meter bridge can be Used to determine the unknown resistance of the given wire.
12 In a meter bridge, the null point is found at a distance of 33.7 cm from one end of the meter bridge. If now a resistance of 12Ωis connected in parallel with S, the null point occurs at 51.9 cm. Determine the values of R and S.
13 Give the principle of working of a potentiometer. Explain with a neat circuit diagram how potentiometer can be used to compare the emf of two primary cells.
14 Explain with a neat circuit diagram how potentiometer can be used to find the internal resistance of a cell.
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Worksheet for CBSE Physics Class 12 Chapter 3 Current Electricity
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CBSE Class 12 Physics Chapter 3 Current Electricity worksheets cover all topics as per the latest syllabus for current academic year.
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