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CAIE IGCSE Physics 7.2.5 Evaluate and Improve Methods Questions

Use authentic IGCSE Physics questions and mark schemes to evaluate experimental methods, identify limitations and explain improvements.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • Evaluate and improve methods.

CAIE IGCSE Physics 7.2.5 Evaluate and Improve Methods Questions question 1

[Maximum number: 2]

Fig. 5.1 shows a plastic cup. The cup contains sand, an electric heater and a thermometer.

Fig. 5.1

Fig. 5.1

The power of the heater is 50 W . The mass of the sand in the cup is 550 g . The initial temperature of the sand is 20∘C20^{\circ} \mathrm{C}. The heater is switched on for 2.0 minutes. The temperature is recorded until the temperature stops increasing. The highest temperature recorded by the thermometer is 33∘C33^{\circ} \mathrm{C}.

Explain why the specific heat capacity of sand may be different from the value calculated in (a)(ii).

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