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Conduction is one of the three methods of heat transfer and has specific characteristics. Option A (Actual movement of heated molecules occurs) is incorrect — this describes CONVECTION, not conduction. In convection, heated fluid molecules actually move from one place to another, carrying heat with them. In convection, bulk motion of the medium occurs. Option B (No medium is required) is incorrect — this describes RADIATION. Radiation is the only method that does not require a material medium and can travel through vacuum. Conduction definitely requires a material medium (solid, liquid, or gas). Option C (A medium is required and particles do not move from their positions) is CORRECT — conduction requires a material medium and works by transferring energy from one particle to its neighbor through vibrations, without the particles physically moving from their positions. The image specifically states: ऊष्मा के संचरण के लिए माध्यम की आवश्यकता होती है and माध्यम के तत्व कणों का स्थान परिवर्तित नहीं होता। Conduction is most efficient in solids (especially metals) and least efficient in liquids and gases. Option D (Heat travels at speed of light) is incorrect — this describes radiation. Electromagnetic radiation (including heat radiation) travels at the speed of light (~3 × 10⁸ m/s) in vacuum, but this is a property of radiation, not conduction.
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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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