Open & Closed Circuits — Homi Bhabha Class 6 Physics MCQs with Solutions
Free Homi Bhabha Class 6 Physics Open & Closed Circuits MCQs with step-by-step solutions (10 questions). Part of Electricity and Magnetism. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Open & Closed Circuits · easy · theory
A circuit in which the path is complete and current flows is called a …
A. Open circuit
B. Empty circuit
C. Closed circuit ✓ Correct
D. Broken circuit
Solution: When the path is complete and current flows, the circuit is a closed circuit.
Q2 — Open & Closed Circuits · easy · theory
A circuit in which the path is broken and no current flows is called an …
A. Open circuit ✓ Correct
B. Full circuit
C. Closed circuit
D. Round circuit
Solution: When there is a gap in the path and no current flows, the circuit is an open circuit.
Q3 — Open & Closed Circuits · easy · theory
In which type of circuit does the bulb glow?
A. A closed circuit ✓ Correct
B. A cut circuit
C. An open circuit
D. A broken circuit
Solution: The bulb glows only in a closed circuit, because current can flow through it.
Q4 — Open & Closed Circuits · easy · theory
When you switch OFF a light, the circuit becomes …
A. Closed
B. Wet
C. Brighter
D. Open (the path is broken) ✓ Correct
Solution: Switching off breaks the path, making the circuit open, so no current flows.
Q5 — Open & Closed Circuits · medium · theory
A switch works by …
A. Colouring the current
B. Opening and closing (breaking and completing) the circuit ✓ Correct
C. Making the wire longer
D. Cooling the bulb
Solution: A switch opens the circuit to stop the current and closes it to let the current flow.
Q6 — Open & Closed Circuits · medium · theory
When you switch ON a fan, the switch …
A. Closes the circuit so current can flow ✓ Correct
B. Removes the cell
C. Breaks the wire
D. Opens the circuit
Solution: Switching on closes the circuit, completing the path so current can flow to the fan.
Q7 — Open & Closed Circuits · medium · theory
In an open circuit, the bulb does not glow because …
A. There is a gap, so current cannot flow ✓ Correct
B. There is too much current
C. The bulb is too new
D. The wire is too thick
Solution: An open circuit has a gap in the path, so current cannot flow and the bulb stays off.
Q8 — Open & Closed Circuits · medium · theory
Which action will make a glowing bulb go OFF?
A. Tightening the wires
B. Adding more cells
C. Opening the switch (breaking the circuit) ✓ Correct
D. Closing the switch
Solution: Opening the switch breaks the circuit, so the current stops and the bulb goes off.
Q9 — Open & Closed Circuits · hard · theory
A circuit has its switch turned ON, a good cell and good wires, but the bulb is fused (its thin wire inside is broken). What happens?
A. The bulb glows blue
B. The circuit is closed and the bulb glows
C. The bulb glows even though it is broken
D. The circuit is open at the broken part, so the bulb does not glow ✓ Correct
Solution: The broken wire inside the bulb leaves a gap, so the circuit is open there and the bulb cannot glow.
Q10 — Open & Closed Circuits · hard · theory
Why is a switch so useful in our homes?
A. It makes electricity for free
B. It makes the bulb change colour
C. It stores electricity for later
D. It lets us open and close the circuit to turn devices off and on safely ✓ Correct
Solution: A switch lets us safely close the circuit to turn a device on and open it to turn the device off.