Edexcel IGCSE Physics 4.9 Thermal Transfer Practical Questions

Investigate metal-strip conduction and bottle-surface radiation with controlled variables, repeat measurements and temperature data that support fair comparisons.

Exam points

Design a controlled comparison of metals by heating equal-length, width and thickness strips in hot water and timing the colour change along each strip.
Sketch hot- and cold-water temperature–time curves, and determine a cooling rate at a stated temperature from the tangent gradient.
Evaluate which metal transfers energy most effectively by comparing the time taken for the strip colour change to reach its end.
Improve investigation reliability by repeating measurements and calculating a mean.
Plan a fair test of how bottle colour affects absorbed infrared radiation by controlling water volume, heater distance and output, and starting temperature.

[Maximum number: 4]

A student pours a known volume of hot water into a metal container. They place the metal container into an insulated plastic cup containing an equal volume of cold water.

Figure for Question Edexcel IGCSE Physics 4.9 Thermal Transfer Practical Questions question 1 — Edexcel IGCSE Physics

The student uses temperature probes to measure the temperatures of both the water in the metal container and the water in the plastic cup.

The het water has an initial temperature of $70^{\circ} \mathrm{C}$ and the cold water has an initial temperature of $5^{\circ} \mathrm{C}$ .

On the axes, sketch how the temperature of the hot water and the temperature of the cold water vary with time.

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Edexcel IGCSE Physics 4.9 Thermal Transfer Practical Questions question 1