Matching Heat Transfer Mechanisms

This question requires matching scenarios involving heat transfer (LIST-I) with the dominant heat transfer mechanism or condition (LIST-II).

Analysis of Scenarios:

• A. Water boiling in open vessel: Boiling involves significant fluid movement as vapor bubbles rise. This process is characterized by vigorous heat transfer and is dominated by natural convection. Thus, A matches with IV. Dominant natural convection.
• B. Night exchange of heat between atmosphere and Earth: At night, objects on Earth, including the surface, cool down by emitting thermal energy outwards. This emission into space or the cooler atmosphere primarily occurs through thermal radiation. Thus, B matches with III. Thermal radiation.
• C. Loss of heat through furnace wall: Heat transfer through the solid material of a furnace wall occurs via conduction. Assuming uniform temperature distribution across the thickness and heat flow primarily in one direction, it is approximated as conduction in one dimension. Thus, C matches with I. Conduction in one dimension.
• D. Heat sink used to cool circuit component: A heat sink transfers heat from a component to the surrounding air. This involves heat conduction from the component to the heat sink and then convection from the heat sink's fins to the air. Therefore, both conduction and convection occur simultaneously. Thus, D matches with II. Conduction and convection occurring simultaneously.

Correct Matching:

Based on the analysis, the correct matching is:

• A - IV
• B - III
• C - I
• D - II

This corresponds to the option A-IV, B-III, C-I, D-II.