Chapter 3: Electricity Circuits and Their Components — Online MCQ Test
SCIENCE (CURIOSITY) · CLASS 7th · Karnataka State Board
Practice Chapter 3: Electricity Circuits and Their Components with a free chapter-wise online MCQ test.
This chapter covers: Electric circuit Cell Battery Bulb Switch Conductors Insulators Circuit symbols Series circuit Parallel circuit.
AI-generated questions from basic to board-exam level, with instant results and explanations.
Chapter 3: Electricity Circuits and Their Components — Important Questions & Answers
Which of the following is a source of electrical energy in a simple circuit?
- A. Bulb
- B. Cell
- C. Switch
- D. Wire
Answer: B. Cell
A cell provides electrical energy to make current flow in a circuit. The bulb, switch, and wire are used for other roles in the circuit.
A cell provides electrical energy to make current flow in a circuit. The bulb, switch, and wire are used for other roles in the circuit.
What is the main function of a switch in an electric circuit?
- A. To produce light
- B. To break or complete the circuit
- C. To store electricity
- D. To stop the battery from getting used
Answer: B. To break or complete the circuit
A switch controls the flow of current by opening or closing the circuit. When it is closed, current flows; when open, current stops.
A switch controls the flow of current by opening or closing the circuit. When it is closed, current flows; when open, current stops.
A torch bulb does not glow. Which of the following is the most likely reason?
- A. The circuit is open
- B. The wire is made of copper
- C. The switch is closed
- D. The cell is connected properly
Answer: A. The circuit is open
If the circuit is open, current cannot flow, so the bulb will not glow. The other options would normally allow the bulb to glow if all parts are correctly connected.
If the circuit is open, current cannot flow, so the bulb will not glow. The other options would normally allow the bulb to glow if all parts are correctly connected.
Two bulbs are connected in series with a cell. If one bulb fuses, what happens to the other bulb?
- A. It glows brighter
- B. It continues to glow normally
- C. It also stops glowing
- D. It glows only for a second more
Answer: C. It also stops glowing
In a series circuit, all components are connected in a single path. If one bulb fuses, the circuit breaks and current stops everywhere.
In a series circuit, all components are connected in a single path. If one bulb fuses, the circuit breaks and current stops everywhere.
Which of the following circuit symbols is matched correctly?
- A. Cell — zig-zag line
- B. Bulb — cross inside a circle
- C. Switch (open) — a break in the line with a gap
- D. Wire — long and short parallel lines
Answer: C. Switch (open) — a break in the line with a gap
An open switch is shown by a break or gap in the circuit line. The other symbols are mismatched with their components.
An open switch is shown by a break or gap in the circuit line. The other symbols are mismatched with their components.