CBSE Class 12 Physics Chapter 3 Current Electricity MCQs

Class 12 Physics Chapter 3 Current Electricity MCQs is an important part of the CBSE Board Class 12 exams. This chapter help students to understand how electric charges move in a conductor, and also explain concepts like resistance, Ohm’s law, drift velocity and different electrical circuits. Practicing current electricity class 12 mcq and current electricity mcq class 12 makes the subject more clear and also prepare you well for board exam as well as entrance exams.

The class 12 physics chapter 3 mcq are designed in such a way that they test both theory and problem solving skills. Solving mcq of current electricity class 12 regularly helps students to improve speed and accuracy. 

These electric current class 12 mcq are also very helpful for JEE, NEET and other competitive exams because they are based on the NCERT Solutions for Class 12 physics and follow the CBSE Class 12 physics Syllabus. Students can find mcq on physics chapter 3 class 12 little bit tricky but with practice it become easy.

MCQs on Class 12 Chapter 3 Current Electricity 

For Class 12 Physics Chapter 3 Current Electricity, we have shared many multiple choice questions (MCQs) that help students in exam prep. Each question has four given options but only one answer is right. These current electricity class 12 mcq are based on NCERT Solutions for Class 12 physics and also follow the CBSE Class 12 physics syllabus.

Current Electricity Class 12 Physics MCQs with Answers

Q1. The SI unit of electric current is:

a) Ohm

b) Ampere

c) Coulomb

d) Volt

Answer: b) Ampere

Q2. The reciprocal of resistance is called:

a) Capacitance

b) Conductance

c) Inductance

d) Reactance

Answer: b) Conductance

Q3. Which law states that current is directly proportional to potential difference?

a) Faraday’s Law

b) Coulomb’s Law

c) Ohm’s Law

d) Ampere’s Law

Answer: c) Ohm’s Law

Q4. Drift velocity depends on:

a) Temperature only

b) Electric field and mobility of electrons

c) Resistance of wire

d) Capacitance of wire

Answer: b) Electric field and mobility of electrons

Q5. The unit of resistivity is:

a) Ohm-meter

b) Ohm-cm

c) Volt-ampere

d) Coulomb

Answer: a) Ohm-meter

Q6. Current density is defined as:

a) Current per unit area

b) Voltage per unit area

c) Resistance per unit length

d) Power per unit volume

Answer: a) Current per unit area

Q7. If two resistors are connected in series, their total resistance is:

a) Product of resistances

b) Sum of resistances

c) Difference of resistances

d) None

Answer: b) Sum of resistances

Q8. In parallel connection, the potential difference across each resistor is:

a) Same

b) Different

c) Zero

d) Infinite

Answer: a) Same

Q9. The drift velocity of electrons in a conductor is of the order of:

a) 10⁶ m/s

b) 10⁻⁴ m/s

c) 10² m/s

d) 10 m/s

Answer: b) 10⁻⁴ m/s

Q10. Which instrument measures electric current?

a) Voltmeter

b) Ammeter

c) Galvanometer

d) Potentiometer

Answer: b) Ammeter

Q11. What is the charge of 1 mole of electrons?

a) 96500 C

b) 6.023 × 10²³ C

c) 1.6 × 10⁻¹⁹ C

d) 1 C

Answer: a) 96500 C

Q12. Power dissipated in a resistor R connected across V is:

a) V/R

b) V²/R

c) V × R

d) R²/V

Answer: b) V²/R

Q13. Ohm’s law fails when:

a) Resistance is constant

b) Temperature changes

c) Voltage is zero

d) Current is constant

Answer: b) Temperature changes

Q14. A 4Ω and 6Ω resistors are in parallel. Their equivalent resistance is:

a) 10Ω

b) 2.4Ω

c) 4Ω

d) 6Ω

Answer: b) 2.4Ω

Q15. Kirchhoff’s junction rule is based on:

a) Conservation of mass

b) Conservation of momentum

c) Conservation of charge

d) Conservation of energy

Answer: c) Conservation of charge

Q16. Which material has lowest resistivity?

a) Copper

b) Silver

c) Aluminium

d) Nichrome

Answer: b) Silver

Q17. Heating effect of current is given by:

a) Joule’s Law

b) Ohm’s Law

c) Coulomb’s Law

d) Ampere’s Law

Answer: a) Joule’s Law

Q18. The internal resistance of an ideal cell is:

a) Zero

b) Very high

c) Constant

d) Infinite

Answer: a) Zero

Q19. The emf of a cell is always:

a) Greater than terminal voltage

b) Less than terminal voltage

c) Equal to current

d) Equal to resistance

Answer: a) Greater than terminal voltage

Q20. Which factor does not affect resistance of a conductor?

a) Length

b) Area

c) Material

d) Mass

Answer: d) Mass

Q21. The reciprocal of resistivity is:

a) Conductivity

b) Capacitance

c) Inductance

d) Susceptibility

Answer: a) Conductivity

Q22. Superconductors are materials with:

a) Very high resistance

b) Zero resistance

c) Infinite resistance

d) Constant resistance

Answer: b) Zero resistance

Q23. A wire of length L is stretched to double. Its resistance becomes:

a) R

b) 2R

c) 4R

d) R/2

Answer: c) 4R

Q24. Kirchhoff’s loop rule is based on:

a) Conservation of energy

b) Conservation of mass

c) Conservation of momentum

d) Conservation of charge

Answer: a) Conservation of energy

Q25. Wheatstone bridge is used to measure:

a) Resistance

b) Current

c) Voltage

d) Power

Answer: a) Resistance

Q26. Potentiometer measures:

a) Potential difference accurately

b) Resistance

c) Current

d) Capacitance

Answer: a) Potential difference accurately

Q27. Which device converts galvanometer into ammeter?

a) Shunt

b) Multiplier

c) Resistor

d) Rheostat

Answer: a) Shunt

Q28. Which device converts galvanometer into voltmeter?

a) Shunt

b) Multiplier

c) Resistance box

d) Potentiometer

Answer: b) Multiplier

Q29. In a series circuit, current is:

a) Same through all elements

b) Different in each resistor

c) Zero in all resistors

d) Maximum in higher resistor

Answer: a) Same through all elements

Q30. Resistivity of a conductor depends on:

a) Material and temperature

b) Length and area

c) Current and voltage

d) Mass and density

Answer: a) Material and temperature

Q31. The slope of V–I graph gives:

a) Resistance

b) Power

c) Current

d) Charge

Answer: a) Resistance

Q32. If the resistance of wire is halved, then current becomes:

a) Half

b) Double

c) Same

d) Zero

Answer: b) Double

Q33. In metallic conductors, current is due to motion of:

a) Protons

b) Electrons

c) Neutrons

d) Positive ions

Answer: b) Electrons

Q34. Which relation is correct?

a) R = ρL/A

b) R = ρA/L

c) R = LA/ρ

d) R = ρL²/A

Answer: a) R = ρL/A

Q35. If a voltmeter is connected in series, it will:

a) Not show correct reading

b) Burn out

c) Show same reading

d) Work normally

Answer: a) Not show correct reading

Q36. The SI unit of current density is:

a) A/m²

b) A/cm²

c) V/m²

d) Ω/m²

Answer: a) A/m²

Q37. The work done per unit charge in moving charge across a circuit is:

a) Voltage

b) Power

c) Energy

d) Current

Answer: a) Voltage

Q38. Which is not a property of an ideal cell?

a) Infinite resistance

b) Constant emf

c) Zero internal resistance

d) Finite current supply

Answer: a) Infinite resistance

Q39. Drift velocity is inversely proportional to:

a) Cross-sectional area

b) Number density of electrons

c) Electric field

d) Mobility

Answer: b) Number density of electrons

Q40. Which device obeys Ohm’s law?

a) Metallic conductor

b) Semiconductor diode

c) Vacuum tube

d) Junction transistor

Answer: a) Metallic conductor