Heat transfer in different states of matter follows different dominant mechanisms. Option A (Conduction) is incorrect — while conduction can occur in liquids and gases, the image specifically states that conduction of heat in liquids and gases by this method is very poor (द्रवों व गैसों में ऊष्मा का संचरण इस विधि द्वारा बहुत कम होता है). This is because in liquids and gases, molecules are not tightly packed like in solids, making direct particle-to-particle vibration transfer inefficient. Option B (Convection) is CORRECT — heat in liquids and gases primarily transfers by convection. The image states: गैसों व द्रवों में ऊष्मा का संचरण किस विधि द्वारा होता है — संवहन विधि (Convection) द्वारा. In convection, heated portions of fluid become less dense, rise up, and cooler portions sink, creating convection currents that transfer heat throughout the fluid. Examples: boiling of water, atmospheric circulation, ocean currents, sea breeze, land breeze. Option C (Radiation) is incorrect — radiation can occur through liquids and gases, but it is not the primary mechanism of heat transfer in fluids. Radiation is the primary mechanism in vacuum or when no medium is present. Option D (All three equally) is incorrect — the three modes are not equally dominant in liquids and gases. Convection is overwhelmingly dominant in fluids.
FAQ
Common questions and clear answers for this topic.
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.
Copyright 2026 Exambodh - All rights reserved.
