Electricity plays a vital role in our daily lives, powering everything from lights to appliances. Understanding electric cells, circuits, switches, and components helps us use electricity safely and effectively. These MCQs from Class 7 Science Chapter 3 – Electricity: Circuits and their Components will test your knowledge and strengthen your concepts about how circuits work.
MCQ Questions for Class 7 Science Chapter 3 Electricity: Circuits and their Components with Answers
Question 1: Which device is used to open or close an electric circuit?
a) Bulb
b) Switch
c) Battery
d) Wire
Answer:
b) Switch — A switch is used to open or close an electric circuit.
Question 2: Which of the following is a good conductor of electricity?
a) Plastic
b) Rubber
c) Copper
d) Wood
Answer:
c) Copper — Copper is a good conductor of electricity.
Question 3: What happens when a bulb’s filament breaks?
a) The bulb glows brighter
b) The bulb does not glow
c) The bulb produces sound
d) The bulb changes color
Answer:
b) The bulb does not glow — A broken filament interrupts the circuit.
Question 4: In a circuit, the path through which current flows is called?
a) Loop
b) Network
c) Circuit
d) Channel
Answer:
c) Circuit — The closed path of current is called a circuit.
Question 5: Which of the following is an insulator?
a) Iron
b) Aluminium
c) Plastic
d) Copper
Answer:
c) Plastic — Plastic does not allow current to pass.
Question 6: Which part of an electric cell is marked with a positive sign?
a) Metal cap
b) Metal plate
c) Base
d) Outer covering
Answer:
a) Metal cap — The metal cap of a cell is the positive terminal.
Question 7: A torch bulb glows only when the circuit is?
a) Open
b) Broken
c) Closed
d) Switched off
Answer:
c) Closed — A bulb glows only when the circuit is closed.
Question 8: The device used to protect circuits from large current is?
a) Bulb
b) Fuse
c) Switch
d) Cell
Answer:
b) Fuse — A fuse protects circuits by melting when current exceeds the limit.
Question 9: Which material is generally used for making filaments of bulbs?
a) Copper
b) Aluminium
c) Tungsten
d) Silver
Answer:
c) Tungsten — Tungsten is used because it has high melting point.
Question 10: Which of the following represents a closed circuit?
a) Switch ON
b) Switch OFF
c) Broken wire
d) Bulb fused
Answer:
a) Switch ON — A circuit is closed when the switch is on.
Question 11: The flow of electric current in a circuit is due to?
a) Heat flow
b) Electron movement
c) Sound waves
d) Light rays
Answer:
b) Electron movement — Current is caused by movement of electrons.
Question 12: Which of the following is a source of electricity?
a) Fuse
b) Switch
c) Electric cell
d) Bulb
Answer:
c) Electric cell — An electric cell provides electricity.
Question 13: What do we call the joining wires in a circuit?
a) Conductors
b) Resistors
c) Insulators
d) Switches
Answer:
a) Conductors — Wires are conductors used in circuits.
Question 14: What is used to represent electrical components in diagrams?
a) Charts
b) Symbols
c) Pictures
d) Codes
Answer:
b) Symbols — Standard symbols represent circuit components.
Question 15: Which of these can complete a circuit with a bulb?
a) Plastic scale
b) Iron nail
c) Wooden stick
d) Eraser
Answer:
b) Iron nail — Iron is a conductor and completes the circuit.
Question 16: A switch in OFF position means?
a) Closed circuit
b) Open circuit
c) Bulb glows
d) Fuse works
Answer:
b) Open circuit — Switch OFF breaks the circuit path.
Question 17: A bulb glows when?
a) Circuit is incomplete
b) Circuit is broken
c) Circuit is complete
d) Fuse melts
Answer:
c) Circuit is complete — Current flows when the circuit is complete.
Question 18: Which symbol is used for a battery in a circuit diagram?
a) One long and one short line
b) Circle with cross
c) Zigzag line
d) Rectangle
Answer:
a) One long and one short line — Multiple cells together form a battery symbol.
Question 19: Which of the following prevents electric shocks?
a) Insulators
b) Conductors
c) Switches
d) Fuses
Answer:
a) Insulators — Insulators prevent electric shocks.
Question 20: Which device produces light when current passes through it?
a) Switch
b) Fuse
c) Bulb
d) Battery
Answer:
c) Bulb — A bulb lights up when current flows through its filament.
Question 21: Which terminal of the cell connects to the longer line in a circuit symbol?
a) Positive
b) Negative
c) Both
d) None
Answer:
a) Positive — The longer line represents the positive terminal.
Question 22: Which of the following materials will NOT allow electricity to pass?
a) Copper
b) Iron
c) Aluminium
d) Rubber
Answer:
d) Rubber — Rubber is an insulator.
Question 23: The circuit will not work if?
a) Switch is ON
b) Wire is broken
c) Cell is connected
d) Bulb is in place
Answer:
b) Wire is broken — A broken wire stops current flow.
Question 24: The device used for connecting and disconnecting current is?
a) Fuse
b) Battery
c) Switch
d) Bulb
Answer:
c) Switch — A switch connects or disconnects current.
Question 25: Which of these is essential for an electric circuit?
a) Chalk
b) Cell
c) Glass rod
d) Plastic
Answer:
b) Cell — A cell is the source of electricity in a circuit.
Question 26: A fuse wire is made of?
a) Plastic
b) Lead and tin alloy
c) Copper
d) Aluminium
Answer:
b) Lead and tin alloy — Fuse wires are made of lead-tin alloy.
Question 27: Which material is used to cover electric wires?
a) Copper
b) Aluminium
c) Plastic
d) Iron
Answer:
c) Plastic — Wires are covered with plastic to prevent shock.
Question 28: A bulb glows because of?
a) Magnetic field
b) Heating effect of current
c) Sound waves
d) Chemical reaction
Answer:
b) Heating effect of current — Filament glows due to heating effect.
Question 29: A switch is made of?
a) Conductor
b) Insulator
c) Both
d) None
Answer:
a) Conductor — Switch is made of conducting material.
Question 30: Electric cells are connected together to form a?
a) Wire
b) Battery
c) Switch
d) Fuse
Answer:
b) Battery — A battery is a group of connected cells.
Fill in the Blanks Questions for Class 7 Science Chapter 3 Electricity: Circuits and their Components
1. An electric cell produces electricity from ___ energy.
Answer:
Chemical energy
2. The metal cap of a cell is the ___ terminal.
Answer:
Positive
3. The metal disc at the base of a cell is the ___ terminal.
Answer:
Negative
4. A bulb glows only when the circuit is ___.
Answer:
Closed
5. A switch in the OFF position makes the circuit ___.
Answer:
Open
6. Wires are usually made of copper because it is a good ___ of electricity.
Answer:
Conductor
7. The material used to cover electric wires is generally ___.
Answer:
Plastic
8. A bulb filament is usually made of ___ metal.
Answer:
Tungsten
9. A fuse is a safety device used to protect circuits from ___ current.
Answer:
Excess
10. A group of two or more cells connected together is called a ___.
Answer:
Battery
11. The flow of electric current in a circuit is due to the movement of ___.
Answer:
Electrons
12. The longer line in the circuit symbol of a cell represents the ___ terminal.
Answer:
Positive
13. The shorter line in the circuit symbol of a cell represents the ___ terminal.
Answer:
Negative
14. The filament of a bulb glows due to the ___ effect of electric current.
Answer:
Heating
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