Chapter Exam

Chapter-5 Electricity — Online MCQ Test

Q: Which of the following is used to complete an electric circuit?

Answer: B. Conductor — A conductor allows electric current to pass through it, so it helps complete the circuit. Insulators do not allow current to flow easily.

Q: What is the source of electricity in a simple electric circuit?

Answer: C. Cell — A cell provides electrical energy to the circuit. It is the basic source of current in a simple circuit.

Q: Which of the following will make a bulb glow in a circuit?

Answer: A. A closed circuit with a cell, wires, and bulb — A bulb glows only when the circuit is closed and current can flow through it. A break in the circuit stops current flow.

Q: A bulb does not glow in a torch even after inserting new cells. Which is the most likely reason?

Answer: B. The circuit may be incomplete — Even with new cells, the bulb will not glow if the circuit is not complete. A broken connection prevents current from flowing.

SCIENCE · Samacheer Kalvi 8th · Tamil Nadu State Board

Practice Chapter-5 Electricity with a free chapter-wise online MCQ test for Tamil Nadu State Board Samacheer Kalvi 8th SCIENCE. This chapter covers: current circuit conductor Explains electric circuits conductors insulators and practical applications. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-5 Electricity — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board Samacheer Kalvi 8th SCIENCE — Chapter-5 Electricity, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is used to complete an electric circuit?

A. Insulator
B. Conductor ✓
C. Plastic sheet
D. Rubber band

Answer: B. Conductor
A conductor allows electric current to pass through it, so it helps complete the circuit. Insulators do not allow current to flow easily.

What is the source of electricity in a simple electric circuit?

A. Switch
B. Bulb
C. Cell ✓
D. Wire

Answer: C. Cell
A cell provides electrical energy to the circuit. It is the basic source of current in a simple circuit.

Which of the following will make a bulb glow in a circuit?

A. A closed circuit with a cell, wires, and bulb ✓
B. An open circuit with a bulb only
C. A broken wire connected to the bulb
D. A plastic strip in place of wire

Answer: A. A closed circuit with a cell, wires, and bulb
A bulb glows only when the circuit is closed and current can flow through it. A break in the circuit stops current flow.

A bulb does not glow in a torch even after inserting new cells. Which is the most likely reason?

A. The cells are always useless in a torch
B. The circuit may be incomplete ✓
C. The torch body is made of metal
D. The bulb is a conductor

Answer: B. The circuit may be incomplete
Even with new cells, the bulb will not glow if the circuit is not complete. A broken connection prevents current from flowing.

Which statement is most correct about a simple electric circuit?

A. Electric current flows only when the circuit is closed ✓
B. Current flows even in a broken circuit
C. A bulb glows without a cell
D. Insulators are used to replace all wires

Answer: A. Electric current flows only when the circuit is closed
Electric current needs a complete path to flow. A closed circuit provides that path, so the bulb can glow.