MCQ on Current Electricity with Answers Pdf

MCQ Questions on Electricity with Answers

We are providing here the important MCQ on Current Electricity. Students can practice these questions and answers to revise the key concepts. Students should do a lot of practice to score well in these questions. Get MCQ Questions on Current Electricity with Answers PDF Free Download of all subjects are prepared here according to the latest syllabus and curriculum. Students can practice Electricity Multiple Choice Questions with Answers to score good marks in the examination.


MCQ Questions for Class 12 Science Electricity with Answers 

1. The unit of potential difference is________

A) Volt

B) Ohm

C) Ampere

D) Faraday

Answer: A


2. A fuse wire is inserted in which wire?

A) Live wire

B) In the neutral wire

C) In the earth wire

D) May be connected in any line

Answer: A


3. Unit of electric power may also be expressed as___________

(a) volt ampere

(b) kilowatt hour

(c) watt second

(d) joule second

Answer: B


4. The rate of flow of an electric charge is known as______________

A) Electric potential

B) Electric conductance

C) Electric current

D) None of these

Answer: C


5. To get 2 Ω resistance using only 6 Ω resistors, the number of them required is____________

A) 2

B) 3

C) 4

D) 6

Answer: B


6. Two devices are connected between two points say A and B in parallel. The physical quantity that will remain the same between the two points is________

A) current

B) voltage

C) resistance

D) None of these

Answer: B


7. A fuse wire repeatedly gets burnt when used with a good heater. It is advised to use a fuse wire of_________

A) more length

B) less radius

C) less length

D) more radius

Answer: D


8. What is the relationship between resistance and current?

A) They are directly related to each other.

B) They are inversely related to each other.

C) The resistance has a greater magnitude than current.

D) The current has a greater magnitude than resistance

Answer : B


9. Which of the given is the SI Unit of Electric Current?

A) Ohm

B) Ampere

C) Volt

D) Faraday

Answer: B


10. The relation between potential difference (V) and current (I) is___________

A) V α I2

B) V α 1/I

C) V2 α I

D) V α I

Answer: D


11. During the verification of Ohm’s law:

(a) Ammeter and voltmeter should be connected in series

(b) Ammeter should be connected in series and voltmeter in parallel

(c) ammeter should be connected in parallel and voltmeter in series

(d) Ammeter and voltmeter should be connected in parallel

Answer: B


12. Which of the following laboratory apparatus is not used during the verification of Ohm’s law:

(a) Voltmeter

(b) Ammeter

(c) Galvanometer

(d) Rheostat

Answer: C


13. The resistance of a conductor is directly proportional to_________________

A)  Its area of cross-section

B)  density

C)  melting point

D)  length

Answer: A


14.The purpose of a rheostat is___________

A)  Increase the magnitude of current only

B)  Decrease the magnitude of current only

C)  Increase or decrease the magnitude of current

D)  None of these

Answer: C


15. The resistance of a conductor is inversely proportional to its:

(a) area of cross-section

(b) length

(c) specific resistance

(d) density

Answer: A


16.  Point to be kept in mind for verification of Ohm’s Law is______________

A)  Ammeter and voltmeter should be connected in series

B)  Ammeter should be connected in series and voltmeter in parallel

C)  Ammeter should be connected in parallel and voltmeter in series

D)  Ammeter and voltmeter should be connected in parallel

Answer: B


17. The north pole of Earth’s magnet is in the____________

A) Geographical South

B) Geographical East

C) Geographical West

D) Geographical North

Answer: A


18. An electric motor is a device which transforms______________

A) Mechanical energy into electrical energy

B) Electrical energy into mechanical energy 

C) Kinetic energy into potential energy

D) Electrical energy into Potential energy

Answer: B


19. The frequency of electricity produced by DC generator is equal to_______________

A) 0 Hz

B) 50 Hz

C) 100 Hz

D) 200 Hz

Answer: A


20. How much more heat is produced, if the current is doubled?

(a) twice the original amount

(b) thrice the original amount

(c) four times the original amount

(d) five times the original amount

Answer: C


22. Which of the following represents voltage?

(a) Work done / Current × Time

(b) Work done × Charge

(c) Work done × Time / Current

(d) Work done × Charge × Time

Answer: A


23. The force exerted on a current carrying wire placed in a magnetic field is zero when the angle between wire and the direction of magnetic field is________________

A) 45o

B) 60o

C) 90o

D) 180o

Answer: D


24. How can the electric charge be established?

A) Electrons can be removed from atoms and accumulated to produce a negative charge.

B) Atoms from which electrons have been removed produce a positive electric charge.

C) Both A and B.

D) Neither A nor B.

Answer: C


25. Two appliances of rating 200 watt-250 volts and 100 watt-250 volts are joined in series to a 250 volts supply. Total power consumed in the circuit is____________

(a) 46 watt

(b) 67 watts

(c) 10 watt

(d) 30 watt

Answer: B


26. A cooler of 1500 W, 200 volt and a fan of 500 W, 200 volt are to be used from a household supply. The rating of fuse to be used is__________

(a) 2.5 A

(b) 5.0 A

(c) 7.5 A

(d) 10 A

Answer: D


27. Voltage is a form of________________

A) Kinetic energy

B) Potential energy

C) both Potential and Kinetic energy

D) None of the above

Answer: B


28. The curve representing Ohms law is a____________

A) Linear

B) cosine function

C) Parabola

D) Hyperbola

Answer: A


29. To produce a electric current what is the requirement?

A) A voltage source

B)  A source of energy that moves charges

C) An electric field moving through a conductor

D) All

Answer: D


30. A galvanometer can be converted into a voltmeter by connecting___________

(a) a high resistance in series

(b) a low resistance in series

(c) a low resistance in parallel

(d) a high resistance in parallel

Answer: A


31. To measure the p.d. between two ends of a resistor in a circuit, it is essential that the resistance of the voltmeter be very large compared to_______

(a) Other resistances in the circuit

(b) the combined resistance of all the resistors in the circuit

(c) the largest resistance in the circuit

(d) the resistance of the resistor across which the meter is connected.

Answer: D


32. The current which is assumed to be flowing in a circuit from positive terminal to negative, is called______________

A) direct current

B) pulsating current

C) conventional current

D) alternating current

Answer: C


33. When no current is passed through a conductor__________

A) the free electrons do not move

B) the average speed of a free electron over a large period of time is not zero

C) the average velocity of a free electron over a large period of time is zero

D) the average of the velocities of all the free electrons at an instant is non zero

Answer: D


34. Drift velocity of electrons is due to_____________

A) motion of conduction electrons due to random collisions.

B) motion of conduction electrons due to electric field E

C) repulsion to the conduction electrons due to inner electrons of ions.

D) collision of conduction electrons with each other.

Answer: B


35. What is the amount of current flowing through an electric press, if the amount of charge passing through a conductor in 10 minutes is 300 C?

(a) 30 A

(b) 0.3 A

(c) 0.5 A

(d) 5 A

Answer: C


36. A current-carrying rectangular coil placed in a uniform magnetic field. In which orientation will the coil rotate?

(a) In any orientation

(b) The magnetic field is parallel to the plane of the coil

(c) The magnetic field is at 450 with the plane of the coil

(d) The magnetic field is perpendicular to the plane

Answer: D


37. In the absence of an electric field, the mean velocity of free electrons in a conductor at absolute temperature (T) is______________

A) zero

B) independent of T

C) proportional to T

D) proportional to T2

Answer: A