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Current Electricity Set-2 MCQ Online Practice Test | Class 12 | Quiz Tweek

Current Electricity Set-2

Practice Important MCQs for Current Electricity — 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.

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Q1. The SI unit of electric current is:

(A)

volt

(B)

ohm

(C)

ampere

(D)

coulomb

Q2. If $1$ coulomb of charge flows through a conductor in $2$ seconds, the current is:

(A)

$0.5$ A

(B)

$2$ A

(C)

$1$ A

(D)

$4$ A

Q3. The relation between current density $J$ , conductivity $\sigma$ , and electric field $E$ is:

(A)

$J=\sigma E$

(B)

$J=\frac{E}{\sigma}$

(C)

$J=\sigma/E$

(D)

$J=E-\sigma$

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

(A)

temperature decreases and electric field increases

(B)

temperature increases and electric field decreases

(C)

both temperature and electric field increase

(D)

temperature has no effect

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

(A)

$R=\rho \frac{l}{A}$

(B)

$R=\rho \frac{A}{l}$

(C)

$R=\frac{l}{\rho A}$

(D)

$R=\frac{\rho}{lA}$

Q6. The resistivity of a material depends on:

(A)

only length of the conductor

(B)

only area of cross-section

(C)

nature of material and temperature

(D)

only current through it

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

(A)

$1\ \Omega$

(B)

$5\ \Omega$

(C)

$6\ \Omega$

(D)

$0.5\ \Omega$

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

(A)

$5\ \Omega$

(B)

$1\ \Omega$

(C)

$\frac{6}{5}\ \Omega$

(D)

$\frac{5}{6}\ \Omega$

Q9. The unit of resistivity is:

(A)

$\Omega$

(B)

$\Omega\,m$

(C)

$\Omega/m$

(D)

$m/\Omega$

Q10. The graph between potential difference $V$ and current $I$ for an ohmic conductor is:

(A)

a parabola

(B)

a straight line through the origin

(C)

a hyperbola

(D)

a straight line not passing through origin

Q11. Which of the following devices works on the principle of null deflection?

(A)

ammeter

(B)

potentiometer

(C)

voltmeter

(D)

galvanometer only

Q12. The emf of a cell is measured by:

(A)

ammeter

(B)

voltmeter connected in series

(C)

potentiometer

(D)

ohmmeter

Q13. If the length of a wire is doubled and its cross-sectional area is halved, its resistance becomes:

(A)

half

(B)

same

(C)

four times

(D)

eight times

Q14. The slope of an $I-V$ graph for an ohmic conductor represents:

(A)

resistance

(B)

conductance

(C)

resistivity

(D)

power

Q15. Kirchhoff’s current law is based on conservation of:

(A)

energy

(B)

charge

(C)

momentum

(D)

mass

...and 15 more challenging questions available in the interactive simulator.

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