Domestic Circuits — Homi Bhabha Class 9 Physics MCQs with Solutions
Free Homi Bhabha Class 9 Physics Domestic Circuits MCQs with step-by-step solutions (7 questions). Part of Electricity & Magnetism. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Domestic Circuits · medium · theory
The voltage of the domestic electricity supply in India is about:
A. 220 V ✓ Correct
B. 1000 V
C. 12 V
D. 5 V
Solution: Indian household supply is about 220 V AC at 50 Hz.
Q2 — Domestic Circuits · hard · theory
The earth wire in a domestic circuit is provided mainly for:
A. safety, by carrying leakage current to the ground ✓ Correct
B. supplying current to appliances
C. increasing the voltage
D. reducing the bill
Solution: The earth wire safely diverts any leakage current to the ground, protecting the user from shock.
Q3 — Domestic Circuits · medium · theory
Electrical appliances in a house are connected in parallel so that:
A. each gets the full supply voltage and can be switched on/off independently ✓ Correct
B. only one can work at a time
C. they share the voltage
D. the current is the same in all
Solution: Parallel connection gives every appliance the full 220 V and independent operation.
Q4 — Domestic Circuits · hard · theory
For safety, the fuse (or MCB) in a household circuit is always connected in the:
A. neutral wire
B. appliance body
C. earth wire
D. live wire ✓ Correct
Solution: The fuse is placed in the live wire so that, when it blows, the appliance is disconnected from the live supply.
Q5 — Domestic Circuits · easy · theory
In household wiring, the various appliances are connected to one another in:
A. parallel ✓ Correct
B. a single loop controlled by one switch
C. series
D. no fixed arrangement
Solution: Appliances are wired in parallel so each receives the full mains voltage and can be switched on or off independently.
Q6 — Domestic Circuits · medium · theory
What is the purpose of a fuse in a domestic circuit?
A. to melt and break the circuit when the current becomes too high ✓ Correct
B. to increase the current in the circuit
C. to boost the supply voltage
D. to store electric charge
Solution: A fuse is a thin wire that melts and breaks the circuit when the current exceeds a safe value, protecting wiring and appliances from overheating and fire.
Q7 — Domestic Circuits · hard · theory
The earth (ground) wire connected to the metal body of an appliance protects the user by:
A. providing a low-resistance path so any leaked current flows to earth and the fuse blows ✓ Correct
B. raising the supply voltage
C. increasing the efficiency of the appliance
D. reducing the current in the live wire during normal operation
Solution: If the live wire touches the metal casing, the earth wire offers a low-resistance path to the ground. The resulting large current blows the fuse and keeps the casing at earth potential, preventing an electric shock.