AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
(C) Earth wire
The wire with green insulation is the earth wire, which is connected to a metal plate deep in the earth and acts as a safety measure for metallic appliances.
Source: Chapter 12, Section 12.4 Domestic Electric Circuits
---
The passage explicitly states: "The earth wire, which has insulation of green colour…" Note that Exercise Q3(b) also tests this as a false statement — "A wire with green insulation is usually the live wire" is FALSE. The live wire is red and neutral is black. Students often confuse these colour codes, so memorise all three: Red = Live, Black = Neutral, Green = Earth.