Chapter Exam

Chapter 6: Current Electricity — Online MCQ Test

Q: What is the SI unit of electric current?

Answer: B. Ampere — Electric current is measured in ampere (A), which is the SI unit of current.

Q: Ohm's law states that for a conductor at constant temperature, current is directly proportional to:

Answer: B. Potential difference — According to Ohm's law, V = IR, so current is directly proportional to potential difference when temperature remains constant.

Q: If the drift velocity of electrons in a conductor increases, the current will:

Answer: C. Increase — Current is directly proportional to drift velocity for a given conductor, so increasing drift velocity increases current.

Q: Two wires of the same material and length have radii r and 2r. The ratio of their resistances R1 : R2 is:

Answer: C. 4 : 1 — Resistance is inversely proportional to cross-sectional area, and area varies as r^2. So doubling the radius makes the resistance one-fourth.

Q: Which change will increase the sensitivity of a potentiometer?

Answer: C. Reduce the potential gradient along the wire — Lower potential gradient gives a larger balancing length for a given potential difference, making the potentiometer more sensitive.

PHYSICS · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board

Practice Chapter 6: Current Electricity with a free chapter-wise online MCQ test for Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR PHYSICS. This chapter covers: This chapter covers electric current Ohm Law drift velocity resistance temperature dependence Kirchhoff laws Wheatstone bridge meter bridge and potentiometer applications.. AI-generated questions from basic to board-exam level, with instant results and explanations.

Questions

20m

Time Limit

Attempts Left

10 random questions from this chapter (mixed difficulty)
Questions you've seen before won't repeat until the pool resets
You have 20 minutes — exam auto-submits when time is up
Maximum 3 attempts per chapter
Results and explanations shown immediately after submission

New here? Register free — includes 3 free chapter exams.

Chapter 6: Current Electricity — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR PHYSICS — Chapter 6: Current Electricity, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the SI unit of electric current?

A. Volt
B. Ampere ✓
C. Ohm
D. Coulomb

Answer: B. Ampere
Electric current is measured in ampere (A), which is the SI unit of current.

Ohm's law states that for a conductor at constant temperature, current is directly proportional to:

A. Resistance
B. Potential difference ✓
C. Power
D. Charge density

Answer: B. Potential difference
According to Ohm's law, V = IR, so current is directly proportional to potential difference when temperature remains constant.

If the drift velocity of electrons in a conductor increases, the current will:

A. Decrease
B. Remain zero
C. Increase ✓
D. Become alternating

Answer: C. Increase
Current is directly proportional to drift velocity for a given conductor, so increasing drift velocity increases current.

Two wires of the same material and length have radii r and 2r. The ratio of their resistances R1 : R2 is:

A. 1 : 2
B. 2 : 1
C. 4 : 1 ✓
D. 1 : 4

Answer: C. 4 : 1
Resistance is inversely proportional to cross-sectional area, and area varies as r^2. So doubling the radius makes the resistance one-fourth.

Which change will increase the sensitivity of a potentiometer?

A. Increase current through the potentiometer wire
B. Use a shorter potentiometer wire
C. Reduce the potential gradient along the wire ✓
D. Increase the resistance of the galvanometer branch

Answer: C. Reduce the potential gradient along the wire
Lower potential gradient gives a larger balancing length for a given potential difference, making the potentiometer more sensitive.