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Bad conductors (also called insulators or poor conductors) are materials that do not allow heat to pass through them easily. Option A (Copper) is incorrect — copper is an excellent conductor of heat, second only to silver among metals. Copper is widely used in heat exchangers, cooking vessels, and electrical wiring because of its high thermal and electrical conductivity. Option B (Aluminium) is incorrect — aluminium is a good conductor of heat. It is used in cooking utensils, heat sinks in electronics, and aircraft bodies because of its good thermal conductivity and light weight. Option C (Iron) is incorrect — iron is a good conductor of heat (though less so than copper and aluminium). Iron is used in cooking pans and industrial machinery. All metals, including iron, are generally good conductors of heat. Option D (Cotton) is CORRECT — cotton is a bad conductor of heat. The image specifically lists bad conductors (कुचालक) as: wood (लकड़ी), glass (काँच), silica (सिलिका), cotton (कपास), wool (ऊन), and similar materials. Cotton traps air between its fibres, reducing heat conduction. This is why cotton and woollen clothes keep us warm — they insulate the body from the cold outside. For exams: Bad conductors include: wood, glass, silica, cotton, wool, rubber, air, and non-metals in general.
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Heat is a form of energy that transfers between objects or systems due to a temperature difference, moving from a hotter body to a cooler one until thermal equilibrium is reached.
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