Chapter-5 Electricity — Online MCQ Test
SCIENCE · Samacheer Kalvi 8th · Tamil Nadu State Board
Practice Chapter-5 Electricity with a free chapter-wise online MCQ test.
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.
Chapter-5 Electricity — Important Questions & Answers
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.
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.
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 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.
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.
Electric current needs a complete path to flow. A closed circuit provides that path, so the bulb can glow.