#### 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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- 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?

- 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

#### Kilowatt-hour (KWH) is the unit of?

- Question 16 of 20
##### 16. Question

#### One Kilowatt-hour 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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- 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 non-metallic 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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- 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 cross-sectional 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 10-3 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 non-linear 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 10-19 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 watt-250 volts and 100 watt-250 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 un-equal resistances in parallel