Chapter Exam

Chapter 9: Electric Current — Online MCQ Test

Q: Electric current is defined as the rate of flow of _____ through a conductor.

Answer: B. electric charge — Electric current is defined as the amount of electric charge flowing per unit time through a cross-section of a conductor, measured in amperes (coulombs per second).

Q: The SI unit of electric current is:

Answer: C. Ampere — The ampere (A) is the SI unit of electric current, defined as one coulomb of charge flowing per second through a conductor.

Q: The electromotive force (EMF) of a cell differs from the potential difference across its terminals because:

Answer: D. All of the above — EMF represents total work per unit charge from the chemical source, while terminal voltage = EMF - (current × internal resistance), accounting for energy loss in internal resistance.

Q: A conductor with resistivity ρ = 1.7 × 10⁻⁸ Ωm, length 2m, and cross-sectional area 1mm² has a resistance of approximately:

Answer: B. 34Ω — Using R = ρL/A = (1.7 × 10⁻⁸ × 2)/(1 × 10⁻⁶) = (3.4 × 10⁻⁸)/(10⁻⁶) = 34Ω, where area must be converted to m² (1mm² = 10⁻⁶ m²).

PHYSICAL SCIENCES · CLASS 10th · Telangana State Board

Practice Chapter 9: Electric Current with a free chapter-wise online MCQ test for Telangana State Board CLASS 10th PHYSICAL SCIENCES. This chapter covers: This chapter examines electrodynamics defining electric current potential difference and electromotive force (EMF). Students master Ohm's Law ($V = IR$) analyze factors affecting r.... 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 9: Electric Current — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 10th PHYSICAL SCIENCES — Chapter 9: Electric Current, with answers and explanations. These are sample questions; the exam has its own separate question set.

Electric current is defined as the rate of flow of _____ through a conductor.

A. electrons
B. electric charge ✓
C. ions
D. protons

Answer: B. electric charge
Electric current is defined as the amount of electric charge flowing per unit time through a cross-section of a conductor, measured in amperes (coulombs per second).

The SI unit of electric current is:

A. Coulomb
B. Volt
C. Ampere ✓
D. Ohm

Answer: C. Ampere
The ampere (A) is the SI unit of electric current, defined as one coulomb of charge flowing per second through a conductor.

The resistance of a conductor depends on which of the following factors?

A. Length of the conductor only
B. Cross-sectional area only
C. Material and temperature of the conductor only
D. Length, cross-sectional area, material, and temperature of the conductor ✓

Answer: D. Length, cross-sectional area, material, and temperature of the conductor
Resistance is given by R = ρL/A, where ρ (resistivity) depends on the material and temperature, L is length, and A is cross-sectional area, showing dependence on all these factors.

The electromotive force (EMF) of a cell differs from the potential difference across its terminals because:

A. EMF is always greater than terminal voltage due to internal resistance
B. EMF measures the total work done per unit charge by the chemical reactions
C. Some energy is lost as heat in the internal resistance of the cell
D. All of the above ✓

Answer: D. All of the above
EMF represents total work per unit charge from the chemical source, while terminal voltage = EMF - (current × internal resistance), accounting for energy loss in internal resistance.

A conductor with resistivity ρ = 1.7 × 10⁻⁸ Ωm, length 2m, and cross-sectional area 1mm² has a resistance of approximately: