Science (086) — AI-generated practice question

Metal core (copper/aluminium): Metals are good conductors of electricity, allowing electric current to flow easily through the wire with low resistance. Copper and aluminium are preferred because they are highly conductive, ductile, and relatively affordable.

Outer covering (PVC/rubber): The outer coating must be a non-metal because non-metals are bad conductors (insulators) of electricity. This insulating layer prevents electric shock to the user, avoids short-circuiting if two wires touch, and protects against current leakage.

Source: Chapter 12, Section 12.4 (Domestic Electric Circuits); Chapter 3 (Metals and Non-metals — What You Have Learnt)

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• The question tests two distinct concepts — conductivity of metals and insulating property of non-metals — so address both clearly for full marks (likely 1½ + 1½ or 1 + 2 split).
• Key phrase from Chapter 3: "Metals are good conductors of heat and electricity" and "Non-metals are bad conductors of heat and electricity."
• Examiners expect you to link the property (conductivity / non-conductivity) to the function (carrying current / preventing shock/short circuit). Don't just name the property — state why it matters for the wire.