Chapter Exam

Chapter-4 Electricity — Online MCQ Test

Q: What is electric current?

Answer: B. The amount of charge flowing per unit time — Electric current is defined as the amount of electric charge flowing through a cross-section of a conductor per unit time.

Q: Which unit is used to measure electric current?

Answer: B. Ampere — Electric current is measured in Amperes (A), named after physicist André-Marie Ampère.

Q: Which of the following is NOT a component of an electric circuit?

Answer: C. Magnetic field — A basic electric circuit requires a power source, conductors, and a switch, but a magnetic field is not a necessary component of the circuit itself.

Q: An electric bell works on the principle of:

Answer: B. Magnetic effect of current — An electric bell uses the magnetic effect of electric current. The electromagnet attracts the armature to produce a ringing sound.

Q: In a circuit, if voltage is doubled while resistance remains constant, what happens to the current?

Answer: B. Current doubles — According to Ohm's law (V = IR), if voltage doubles and resistance is constant, current must double to maintain the equation.

SCIENCE · Grade 8 · CBSE(NCERT)

Practice Chapter-4 Electricity with a free chapter-wise online MCQ test for CBSE(NCERT) Grade 8 SCIENCE. This chapter covers: electric current - heating effect - magnetic effect - electromagnet - fuse - electric circuit - resistance. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-4 Electricity — Important Questions & Answers (FAQ)

Frequently asked questions from CBSE(NCERT) Grade 8 SCIENCE — Chapter-4 Electricity, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is electric current?

A. The flow of electrons through a conductor
B. The amount of charge flowing per unit time ✓
C. The resistance in a circuit
D. The voltage across a conductor

Answer: B. The amount of charge flowing per unit time
Electric current is defined as the amount of electric charge flowing through a cross-section of a conductor per unit time.

Which unit is used to measure electric current?

A. Volt
B. Ampere ✓
C. Ohm
D. Watt

Answer: B. Ampere
Electric current is measured in Amperes (A), named after physicist André-Marie Ampère.

Which of the following is NOT a component of an electric circuit?

A. Power source
B. Conductor
C. Magnetic field ✓
D. Switch

Answer: C. Magnetic field
A basic electric circuit requires a power source, conductors, and a switch, but a magnetic field is not a necessary component of the circuit itself.

An electric bell works on the principle of:

A. Heating effect of current
B. Magnetic effect of current ✓
C. Chemical effect of current
D. Light emission

Answer: B. Magnetic effect of current
An electric bell uses the magnetic effect of electric current. The electromagnet attracts the armature to produce a ringing sound.

In a circuit, if voltage is doubled while resistance remains constant, what happens to the current?

A. Current is halved
B. Current doubles ✓
C. Current remains the same
D. Current becomes zero

Answer: B. Current doubles
According to Ohm's law (V = IR), if voltage doubles and resistance is constant, current must double to maintain the equation.