ANS:B - glass wood

The maximum temperature drop for a given heat flow and the same thickness will be in the case of materials with low thermal conductivity. Thermal conductivity is a measure of a material's ability to conduct heat. Higher thermal conductivity means heat can move through the material more easily, resulting in less temperature drop across the material for a given heat flow and thickness. Among the options provided:

• Copper has very high thermal conductivity, so it would result in the least temperature drop for a given heat flow and thickness.
• Steel typically has higher thermal conductivity compared to most insulating materials like glass, wood, and fireclay bricks.
• Glass, wood, and fireclay bricks are generally insulating materials with lower thermal conductivity compared to metals like copper and steel.