The following section consists of Physics Multiple Choice questions on Current Electricity For competitions and exams. Select the correct option to test your skills Current Electricity.
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Current Electricity
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Question 1 of 20
1. Question
If the wire of uniform area of crosssection is cut into two equal parts, the resistivity of each parts will be?

Question 2 of 20
2. Question
All electrical appliances are connected in parallel to each other between the main line and the neutral wire to get?

Question 3 of 20
3. Question
The terminal potential difference of a battery is equal to its e.m.f. when its internal resistance is?

Question 4 of 20
4. Question
The rate of transfer of charges through a circuit is called?

Question 5 of 20
5. Question
A resister carries a current I. The power dissipated is ‘P’. The power dissipated if the same resistor carries the current of 31 is?

Question 6 of 20
6. Question
Electrical conductors contains?

Question 7 of 20
7. Question
Ohm’s law obeyed in?

Question 8 of 20
8. Question
The power dissipated in a resistance is given by?

Question 9 of 20
9. Question
The SI unit of resistance is?

Question 10 of 20
10. Question
Ohm is equivalent to?

Question 11 of 20
11. Question
The resistance of a conductor increases for a given material at ‘constant temperature when?

Question 12 of 20
12. Question
In a thermocouple?

Question 13 of 20
13. Question
Electromotive force may be defined as the?

Question 14 of 20
14. Question
Chemical energy is converted into electrical energy, is case of?

Question 15 of 20
15. Question
Kilowatthour (KWH) is the unit of?

Question 16 of 20
16. Question
One Kilowatthour is equal to?

Question 17 of 20
17. Question
If a current I flows steadily through a resistor ‘R’ for a time ‘t’, then total heat energy supplied to the resistor is given by?

Question 18 of 20
18. Question
The drift velocity in the free electron is responsible for the?

Question 19 of 20
19. Question
When a p.d is applied across a conductor, the electrons experience a force in?

Question 20 of 20
20. Question
The number of coulombs of charges that passes any section of the conductors in one second is called?
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Current Electricity
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Question 1 of 20
1. Question
According to Ohm’s Law? current I = KV, where K is

Question 2 of 20
2. Question
Conductance is the reciprocal of?

Question 3 of 20
3. Question
The S.l unit of electromotive force is?

Question 4 of 20
4. Question
When a battery is connected across a circuit, its potential difference across its terminals is drop and is given by?

Question 5 of 20
5. Question
For an external resistor “R” when internal resistance of a voltage source is ‘r’, then current is given by?

Question 6 of 20
6. Question
When a temperature rises, the drift velocity of the free electrons decreases. Hence for given applied voltage?

Question 7 of 20
7. Question
The unit of temperature coefficient of resistivity is?

Question 8 of 20
8. Question
Only for nonmetallic resistance.

Question 9 of 20
9. Question
A light bulb of 150Ω is connected to a 225 volt source, the current in it is

Question 10 of 20
10. Question
Ampere is equivalent to?

Question 11 of 20
11. Question
In series connection the current flow through each resistor is?

Question 12 of 20
12. Question
When resistors are connected in series, their equivalent resistance is given by?

Question 13 of 20
13. Question
When resistors are connected in parallel the reciprocal of the equivalent resistance is equal to?

Question 14 of 20
14. Question
In parallel connection, the potential different across each resistors is?

Question 15 of 20
15. Question
In parallel connection the current flows through each resistor is?

Question 16 of 20
16. Question
A dry cell supplies?

Question 17 of 20
17. Question
The terminal potential difference of a battery becomes equal to its e.m.f when its internal resistance, is?

Question 18 of 20
18. Question
Metal resistors that conduct in accordance with Ohm’s law are said to be?

Question 19 of 20
19. Question
According to Ohm’s law?

Question 20 of 20
20. Question
The unit of resistivity is?
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Current Electricity
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Question 1 of 20
1. Question
Identify the set in which all the three materials are good conductor of electricity

Question 2 of 20
2. Question
The resistance of an incandescent lamp is

Question 3 of 20
3. Question
A wire of 50 cm long and 1 mm² in crosssectional area carries a current 4A when connected to a 2V battery. The resistivity of the wire is

Question 4 of 20
4. Question
Three resistors are connected to form the sides of a triangle ABC, the resistance of the sides AB, BC and CA are 40 ohms; 60 ohms and 100 ohms respectively. The effective resistance between the points A and B in ohms will be

Question 5 of 20
5. Question
A uniform wire of resistance R is uniformly compressed along its length, until its radius becomes n times the original radius. New resistance of the wire becomes

Question 6 of 20
6. Question
The internal resistance of a cell of emf 12 V is 5 x 10 2 Ω . It is connected across an unknown resistance. Voltage across the cell, when a current of 60 A is drawn from it, is

Question 7 of 20
7. Question
A uniform resistance wire of length L and diameter d has a resistance R. Another wire of same material has length 4L and diameter 2d, the resistance will be

Question 8 of 20
8. Question
Read the following statements carefully Y: The resistivity of a semiconductor decreases with increase of temperature Z : In a conducting solid, rate of collisions between free electrons and ions increases with increases of temperature Select the correct statements (s) from the following

Question 9 of 20
9. Question
Two resistance r1 and r2 (r1 < r2 ) are connected in parallel. Their equivalent resistance R is

Question 10 of 20
10. Question
Which of the following does not obey Ohm’s law

Question 11 of 20
11. Question
The resistivity of a wire depends on its

Question 12 of 20
12. Question
An unknown resistance R1 is connected in series with a resistance of 10Ω. This combination is connected to one gap of a metre bridge while a resistance R2 is connected in the other gap. The balance point is at 50 em. Now, when the 10 Ω resistance is removed the balance position shifts to 40 em. The value of R1 is (in ohm)

Question 13 of 20
13. Question
Two wires of the same dimensions but resistivities P1 and P2 are connected in series. The equivalent resistivity of the combination is

Question 14 of 20
14. Question
At what temperature will the resistance of a copper wire become three times its value at 0°C? (Temperature coefficient of resistance for copper = 4 x 103 per 0C)

Question 15 of 20
15. Question
The maximum current that can be measured.by a galvenometer of resistance 400 is 10 mA. It is converted into a voltmeter that can read upto 50 V. The resistance to be connected in series with the galvanometer is (in ohm).

Question 16 of 20
16. Question
Two wires A and B of same material and same mass have radius 2 r and r. If resistance of wire A is 34 Ω, then resistance of B will be

Question 17 of 20
17. Question
The resistance of a conductor is 5 ohm at 50°C and 6 ohm at 100°C. Its resistance at 0°C is

Question 18 of 20
18. Question
Six identical cells of emf E and internal resistance r are connected in parallel, then the net emf and internal resistance of the combination will be

Question 19 of 20
19. Question
The number of dry cells, each of emf 1.5 volt and internal resistance 0.5 ohm that must be joined in series with a resistance of 20 ohm so as to send a current of 0.6 ampere through the circuit is

Question 20 of 20
20. Question
Two cells each of emf E and internal resistance r are connected parallel across a resistor R. The power dissipated in the resistor is maximum if
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Current Electricity
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Question 1 of 20
1. Question
If an ammeter is to be used in place of a voltmeter the we must connect with the ammeter a

Question 2 of 20
2. Question
A 6 volt battery is connected to the terminals of a three metre long wire of uniform thickness and resistance of 100 ohm. The difference of potential between two points on the wire separated by a distance of 50 em will be

Question 3 of 20
3. Question
A uniform wire of resistance 9 n is cut into 3 equal parts. They are connected in the form of equilateral triangle ABC. A cell of emf 2V anj negligible internal resistance is connected across B and C. Potential difference across AB is

Question 4 of 20
4. Question
When a piece of aluminium wire finite length is drawn through a series of dies to reduce its diameter to half its original value, its resistance will become

Question 5 of 20
5. Question
Three resistances R, 2R and 3R are connected in parallel to a battery. Then

Question 6 of 20
6. Question
The internal resistance of a cell is the resistance of

Question 7 of 20
7. Question
The lead wires should have

Question 8 of 20
8. Question
The resistors of resistances 2 Ω, 4 Ω and 8 Ω are connected in parallel, then the equivalent resistance of the combination will be

Question 9 of 20
9. Question
When cells are arranged in parallel

Question 10 of 20
10. Question
A cell of internal resistance 3 ohm and emf 1 volt is connected to a uniform wire of length 500 em and resistance 3 ohm. The potential gradient in the wire is

Question 11 of 20
11. Question
The resistance of a wire is R. If the length of the wire is doubled by stretching, then the new resistance will be

Question 12 of 20
12. Question
The resistance of 20 em long wire is 5 ohm. The wir~ is stretched to a uniform wire of 40 em length. The resistance now will be (in ohms)

Question 13 of 20
13. Question
The resistance of a coil is 4.2 Ω at 100°C and the temperature coefficient of resistance of its material is 0.004 °C. Its resistance at Q °C is

Question 14 of 20
14. Question
Superposition theorem is not applicable for

Question 15 of 20
15. Question
Which of the following theorem is applicable for both linear and nonlinear circuits ?

Question 16 of 20
16. Question
Resistance of a wire is r ohms. The wire is stretched to double its length, then its resistance in ohms is

Question 17 of 20
17. Question
The charge on an electron is known to be 1.6 x 1019 coulomb. In a circuit the current flowing is 1 A. How many electrons will be flowing through the circuit in a second?

Question 18 of 20
18. Question
Two bulbs marked 200 watt250 volts and 100 watt250 volts are joined in series to 250 volts supply. Power consumed in circuit is

Question 19 of 20
19. Question
he value of the following is given by 100 (kilo ampere ) x ( micro ampere ) 100 milli ampere * 10 ampere

Question 20 of 20
20. Question
A circuit contains two unequal resistances in parallel