Class 12 Physics Chapter 3 Current Electricity MCQs

Class 12 Physics Chapter 3 Current Electricity MCQs

Class 12 Physics Chapter 3 Current Electricity MCQs are designed to help students master the concept and score well in the final exam. These questions are based on the latest CBSE syllabus and NCERT syllabus, ensuring that students are well-prepared for the exam. By solving these chapter-wise MCQs, students can test their knowledge and answering skills within the given time frame, thereby improving their overall performance.

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MCQs on Class 12 Chapter 3 Current Electricity

For the Class 12 Physics Current Electricity Chapter 3, we have provided multiple-choice questions (MCQs) with four options each. Only one option is correct, and students need to select the correct answer from the given options.

Q. The SI unit of electric current is

a) Volt

b) Coulomb

c) Ohm

d) Ampere

Q. Which of the following is true for a series circuit?

a) The current is the same through each resistor.

b) The voltage is the same across each resistor.

c) The power is the same across each resistor.

d) The resistance is the same across each resistor.

Answer: a) The current is the same through each resistor.

Q. Ohm’s law is valid for

a) Semiconductors

b) Conductors

c) Insulators

d) Non-ohmic materials

Q. The resistance of a wire depends on

a) Length of the wire

b) Area of cross-section

c) Material of the wire

d) All of the above

Answer: d) All of the above

Q. Kirchhoff’s first law deals with the conservation of

a) Energy

b) Charge

c) Momentum

d) Mass

Q. If the potential difference across a resistor is doubled, the current will

a) Be halved

b) Double

c) Remain the same

Q. Which material has the least resistivity?

a) Copper

b) Iron

c) Mercury

d) Nichrome

Q. The reciprocal of resistivity is:

a) Conductance

b) Conductivity

c) Resistance

d) Permittivity

Q. A voltmeter is used to measure

a) Current

b) Voltage

c) Resistance

d) Capacitance

Q. The unit of electric power is:

a) Joule

b) Watt

c) Ampere

d) Coulomb

Q. The drift velocity of electrons in a conductor is:

a) Directly proportional to the length of the conductor

b) Directly proportional to the electric field

c) Inversely proportional to the electric field

d) Inversely proportional to the length of the conductor

Answer: b) Directly proportional to the electric field

Q. The power dissipated in a resistor is given by:

a) I^2R

b) IR^2

c) IR

d) I/R

Q. In a parallel circuit, the total resistance is:

a) Less than the smallest individual resistance

b) The sum of all individual resistances

c) Equal to the largest individual resistance

d) More than the largest individual resistance

Answer: a) Less than the smallest individual resistance

Q. The device used to measure electric current is:

a) Voltmeter

b) Ammeter

c) Ohmmeter

d) Wattmeter

Q. Which of the following metals is used for making standard resistors?

a) Copper

b) Iron

c) Manganin

d) Silver

Q. The resistance of a conductor increases with:

a) Increase in temperature

b) Decrease in temperature

c) Increase in length

d) Decrease in length

Q. The unit of resistivity is:

a) Ohm

b) Ohm meter

c) Siemens

d) Siemens per meter

Q. The time constant of an RC circuit is:

a) R + C

b) R/C

c) RC

d) 1/RC

Q. For a given current, power dissipation is least in which type of resistor?

a) High resistance

b) Low resistance

c) Medium resistance

d) Zero resistance

Q. The potential difference across a superconductor is:

a) Zero

b) Infinite

c) Depends on the current

d) Depends on the temperature

Q. If the length of a wire is doubled, its resistance will:

a) Be halved

b) Double

c) Remain the same

Q. In an ohmic conductor, the current is:

a) Directly proportional to voltage

b) Inversely proportional to voltage

c) Proportional to the square of voltage

d) Proportional to the square root of voltage

Answer: a) Directly proportional to voltage

Q. A resistor with a resistance of 5 ohms is connected across a 10V battery. The current flowing through the resistor is:

a) 0.5 A

b) 1 A

c) 2 A

d) 5 A

Q. The unit of electrical conductivity is:

a) Ohm meter

b) Siemens

c) Ohm

d) Siemens per meter

More Resources for Class 12

Q. The resistivity of a semiconductor:

a) Decreases with increase in temperature

b) Increases with increase in temperature

c) Remains constant

d) Is zero at room temperature

Answer: a) Decreases with increase in temperature

Q. The reciprocal of resistance is called:

a) Conductance

b) Resistivity

c) Conductivity

d) Permittivity

Q. Which of the following is a non-ohmic device?

a) Diode

b) Resistor

c) Capacitor

d) Inductor

Q. In a series circuit, the total voltage is:

a) The same across each component

b) The sum of the voltages across each component

c) Zero

d) Infinite

Answer: b) The sum of the voltages across each component

Q. The power supplied by a battery is given by:

a) V^2/R

b) VI

c) I^2R

d) V/R

Q. A material with high resistivity is:

a) Good conductor

b) Poor conductor

c) Superconductor

d) Semiconductor

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