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Current Electricity Set-2

Test your knowledge on Current Electricity from Physics, Class 12.

Current Electricity is one of the most important chapters in Class 12 Physics because it directly connects fundamental concepts like electric current, potential difference, resistance, resistivity, and power with real-life electrical circuits. It forms the basis for solving numericals on Ohm’s law, Kirchhoff’s laws, Wheatstone bridge, meter bridge, potentiometer, drift velocity, and electrical energy, all of which are frequently tested in CBSE board exams.

This chapter is also highly relevant for competitive exams because it combines conceptual understanding with application-based problem solving. A strong command over Current Electricity helps students tackle circuit analysis questions accurately and efficiently, making it a scoring chapter in both board and entrance-level examinations.

30

Minutes

30

Questions

1 / -0

Marking Scheme

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Questions in this Quiz

Q1: The SI unit of electric current is:

  • volt

  • ohm

  • ampere

  • coulomb

Q2: If 11 coulomb of charge flows through a conductor in 22 seconds, the current is:

  • 0.50.5 A

  • 22 A

  • 11 A

  • 44 A

Q3: The relation between current density JJ, conductivity σ\sigma, and electric field EE is:

  • J=σEJ=\sigma E

  • J=EσJ=\frac{E}{\sigma}

  • J=σ/EJ=\sigma/E

  • J=E−σJ=E-\sigma

Q4: The drift velocity of electrons in a conductor increases when:

  • temperature decreases and electric field increases

  • temperature increases and electric field decreases

  • both temperature and electric field increase

  • temperature has no effect

Q5: Which of the following is the correct expression for resistance of a conductor?

  • R=ρlAR=\rho \frac{l}{A}

  • R=ρAlR=\rho \frac{A}{l}

  • R=lρAR=\frac{l}{\rho A}

  • R=ρlAR=\frac{\rho}{lA}

Q6: The resistivity of a material depends on:

  • only length of the conductor

  • only area of cross-section

  • nature of material and temperature

  • only current through it

Q7: Two resistors 2 Ω2\ \Omega and 3 Ω3\ \Omega are connected in series. Their equivalent resistance is:

  • 1 Ω1\ \Omega

  • 5 Ω5\ \Omega

  • 6 Ω6\ \Omega

  • 0.5 Ω0.5\ \Omega

Q8: Two resistors 2 Ω2\ \Omega and 3 Ω3\ \Omega are connected in parallel. Their equivalent resistance is:

  • 5 Ω5\ \Omega

  • 1 Ω1\ \Omega

  • 65 Ω\frac{6}{5}\ \Omega

  • 56 Ω\frac{5}{6}\ \Omega

Q9: The unit of resistivity is:

  • Ω\Omega

  • Ω m\Omega\,m

  • Ω/m\Omega/m

  • m/Ωm/\Omega

Q10: The graph between potential difference VV and current II for an ohmic conductor is:

  • a parabola

  • a straight line through the origin

  • a hyperbola

  • a straight line not passing through origin

...and 20 more questions.

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