Chapter Exam

Chapter 1: Electrostatics — Online MCQ Test

Q: Which of the following is the SI unit of electric charge?

Answer: A. Coulomb — Electric charge is measured in coulomb (C) in the SI system. Newton is a unit of force, volt of potential, and farad of capacitance.

Q: According to Coulomb’s law, the electrostatic force between two point charges is directly proportional to:

Answer: A. The product of the magnitudes of the charges — Coulomb’s law states that force is directly proportional to q1q2 and inversely proportional to the square of the distance between them.

Q: Two identical charges +q and +q are separated by distance r. If the distance is doubled, the electrostatic force becomes:

Answer: B. F/4 — From Coulomb’s law, force varies inversely as the square of distance. When distance becomes 2r, the force becomes F/4.

Q: Which of the following is NOT a property of electrostatic field lines?

Answer: C. They can cross each other — Field lines cannot cross because the electric field at any point has only one direction. If they crossed, the field would have two directions at the same point.

Q: In a Van de Graaff generator, the main purpose of the moving belt is to:

Answer: B. Transport charge to the hollow sphere — The insulating belt carries charge from the lower comb to the hollow metal sphere. This charge accumulates on the sphere, producing a very high potential.

PHYSICS · CLASS 12th · Tamil Nadu State Board

Practice Chapter 1: Electrostatics with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 12th PHYSICS. This chapter covers: This chapter covers electric charges Coulomb law electric fields and Gauss law applications. Students study electric potential potential energy capacitors dielectric polarization a.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 1: Electrostatics — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 12th PHYSICS — Chapter 1: Electrostatics, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is the SI unit of electric charge?

A. Coulomb ✓
B. Newton
C. Volt
D. Farad

Answer: A. Coulomb
Electric charge is measured in coulomb (C) in the SI system. Newton is a unit of force, volt of potential, and farad of capacitance.

According to Coulomb’s law, the electrostatic force between two point charges is directly proportional to:

A. The product of the magnitudes of the charges ✓
B. The sum of the charges
C. The square of the distance between them
D. The inverse of the distance between them

Answer: A. The product of the magnitudes of the charges
Coulomb’s law states that force is directly proportional to q1q2 and inversely proportional to the square of the distance between them.

Two identical charges +q and +q are separated by distance r. If the distance is doubled, the electrostatic force becomes:

A. F/2
B. F/4 ✓
C. 2F
D. 4F

Answer: B. F/4
From Coulomb’s law, force varies inversely as the square of distance. When distance becomes 2r, the force becomes F/4.

Which of the following is NOT a property of electrostatic field lines?

A. They originate from positive charges
B. They are denser where the field is stronger
C. They can cross each other ✓
D. They never form closed loops in electrostatics

Answer: C. They can cross each other
Field lines cannot cross because the electric field at any point has only one direction. If they crossed, the field would have two directions at the same point.

In a Van de Graaff generator, the main purpose of the moving belt is to:

A. Increase magnetic induction
B. Transport charge to the hollow sphere ✓
C. Convert AC into DC
D. Reduce the potential of the sphere

Answer: B. Transport charge to the hollow sphere
The insulating belt carries charge from the lower comb to the hollow metal sphere. This charge accumulates on the sphere, producing a very high potential.