Current Electricity

Class 12 · Physics

76 questions20 easy39 medium17 hard

Sample Questions

Q1.When current flows through a circuit, the electrons actually move from:

  • APositive terminal to negative terminal
  • BNegative terminal to positive terminal (through external circuit)
  • CDo not move
  • DIn random directions

Q2.For what external resistance is power maximum in a circuit with battery emf E and internal resistance r?

  • AR = 0
  • BR = r
  • CR = ∞
  • DR = 2r

Q3.The cause of resistance in metals at high temperatures is primarily:

  • AElectron-electron collisions
  • BLattice vibrations (phonon scattering)
  • CImpurity atoms
  • DMagnetic effects

Q4.By increasing the temperature of the source of a circuit, the drift velocity of electrons in the conductor:

  • AIncreases
  • BDecreases
  • CRemains the same
  • DBecomes random

Q5.The drift velocity of electrons in a copper wire is vd. If the wire is replaced by aluminum wire of double the length and same cross-section, carrying the same current, the drift velocity becomes:

  • Avd/2
  • Bvd
  • C2vd
  • DDepends on resistivity

Q6.This is a sample question to preview what you'll get in the full practice test...

  • A. Option one
  • B. Option two
  • C. Option three
  • D. Option four
Create a test to practice all 76 questions →

Concepts Covered

Cells in series and parallelDrift velocityEMF and internal resistanceElectric currentKirchhoff's lawsMeter bridgeOhm's lawPotentiometerPower dissipationResistance and resistivityTemperature dependence of resistanceWheatstone bridge

Ready to practice?

Create a timed test from 76 questions in Current Electricity. Pick your difficulty, get instant scores.

Start Practice Test