AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
Short-circuiting occurs when the live wire and neutral wire come into direct contact due to damaged insulation or a fault in the appliance.
Consequence: The current in the circuit increases abruptly/heavily, which can damage appliances or cause fire.
Preventive measure: Use an electric fuse in the circuit, which melts and breaks the circuit when current becomes unduly high.
Source: Chapter 12, Section 12.4 — Domestic Electric Circuits
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The question has three parts packed into 2 marks, so keep each part to one short sentence. Examiners look for: (1) correct cause — direct contact of live and neutral wires / damaged insulation, (2) consequence — abrupt/heavy increase in current (or fire/damage to appliances), and (3) prevention — use of electric fuse. Avoid vague answers like "wires touch"; specify live and neutral wires for full credit.