Physics MCQ on Current ElectricityThe 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 cross-section is cut into two equal parts, the resistivity of each parts will be?
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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?
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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?
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Question 4 of 20
4. Question
The rate of transfer of charges through a circuit is called?
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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?
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Question 6 of 20
6. Question
Electrical conductors contains?
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Question 7 of 20
7. Question
Ohm’s law obeyed in?
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Question 8 of 20
8. Question
The power dissipated in a resistance is given by?
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Question 9 of 20
9. Question
The SI unit of resistance is?
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Question 10 of 20
10. Question
Ohm is equivalent to?
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Question 11 of 20
11. Question
The resistance of a conductor increases for a given material at ‘constant temperature when?
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Question 12 of 20
12. Question
In a thermocouple?
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Question 13 of 20
13. Question
Electromotive force may be defined as the?
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Question 14 of 20
14. Question
Chemical energy is converted into electrical energy, is case of?
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Question 15 of 20
15. Question
Kilowatt-hour (KWH) is the unit of?
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Question 16 of 20
16. Question
One Kilowatt-hour is equal to?
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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?
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Question 18 of 20
18. Question
The drift velocity in the free electron is responsible for the?
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Question 19 of 20
19. Question
When a p.d is applied across a conductor, the electrons experience a force in?
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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
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Question 2 of 20
2. Question
Conductance is the reciprocal of?
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Question 3 of 20
3. Question
The S.l unit of electromotive force is?
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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?
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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?
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Question 6 of 20
6. Question
When a temperature rises, the drift velocity of the free electrons decreases. Hence for given applied voltage?
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Question 7 of 20
7. Question
The unit of temperature coefficient of resistivity is?
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Question 8 of 20
8. Question
Only for non-metallic resistance.
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Question 9 of 20
9. Question
A light bulb of 150Ω is connected to a 225 volt source, the current in it is
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Question 10 of 20
10. Question
Ampere is equivalent to?
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Question 11 of 20
11. Question
In series connection the current flow through each resistor is?
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Question 12 of 20
12. Question
When resistors are connected in series, their equivalent resistance is given by?
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Question 13 of 20
13. Question
When resistors are connected in parallel the reciprocal of the equivalent resistance is equal to?
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Question 14 of 20
14. Question
In parallel connection, the potential different across each resistors is?
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Question 15 of 20
15. Question
In parallel connection the current flows through each resistor is?
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Question 16 of 20
16. Question
A dry cell supplies?
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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?
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Question 18 of 20
18. Question
Metal resistors that conduct in accordance with Ohm’s law are said to be?
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Question 19 of 20
19. Question
According to Ohm’s law?
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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
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Question 2 of 20
2. Question
The resistance of an incandescent lamp is
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Question 3 of 20
3. Question
A wire of 50 cm long and 1 mm² in cross-sectional area carries a current 4A when connected to a 2V battery. The resistivity of the wire is
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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
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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
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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
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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
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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
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Question 9 of 20
9. Question
Two resistance r1 and r2 (r1 < r2 ) are connected in parallel. Their equivalent resistance R is
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Question 10 of 20
10. Question
Which of the following does not obey Ohm’s law
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Question 11 of 20
11. Question
The resistivity of a wire depends on its
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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)
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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
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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 10-3 per 0C)
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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).
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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
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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
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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
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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
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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
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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
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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
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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
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Question 5 of 20
5. Question
Three resistances R, 2R and 3R are connected in parallel to a battery. Then
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Question 6 of 20
6. Question
The internal resistance of a cell is the resistance of
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Question 7 of 20
7. Question
The lead wires should have
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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
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Question 9 of 20
9. Question
When cells are arranged in parallel
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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
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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
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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)
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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
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Question 14 of 20
14. Question
Superposition theorem is not applicable for
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Question 15 of 20
15. Question
Which of the following theorem is applicable for both linear and non-linear circuits ?
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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
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Question 17 of 20
17. Question
The charge on an electron is known to be 1.6 x 10-19 coulomb. In a circuit the current flowing is 1 A. How many electrons will be flowing through the circuit in a second?
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Question 18 of 20
18. Question
Two bulbs marked 200 watt-250 volts and 100 watt-250 volts are joined in series to 250 volts supply. Power consumed in circuit is
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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
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Question 20 of 20
20. Question
A circuit contains two un-equal resistances in parallel