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2.2 Thermal properties and temperature

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Question 122
a.

A solar water heater receives energy from solar radiation at a rate of 4.2 kW4.2\text{ kW}4.2 kW.

  • Thermal energy is transferred from the solar panel to water with an efficiency of 30%30\%30%.
  • Cold water of mass 18 kg18\text{ kg}18 kg enters the solar water heater every hour.
  • The specific heat capacity of water is 4200 J/(kg ∘C)4200\text{ J}/(\text{kg }^\circ\text{C})4200 J/(kg ∘C).

Calculate the temperature increase of the water.

temperature increase = …………………………∘C\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots ^\circ\text{C}…………………………∘C

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b.

State and explain one advantage and one disadvantage of heating the water using a solar water heater compared with heating the water in a gas-fired boiler.

advantage: …………………………………………………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots…………………………………………………………………

explanation: …………………………………………………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots…………………………………………………………………

disadvantage: …………………………………………………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots…………………………………………………………………

explanation: …………………………………………………………………\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots…………………………………………………………………

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Markscheme

2.2 Thermal properties and temperature Questions

  1. IGCSE
  2. /Physics
  3. /2.2 Thermal properties and temperature

528 exam-style questions on CIE IGCSE Physics 2.2 Thermal properties and temperature, covering 2.2.1 Thermal expansion of solids, liquids and gases, 2.2.2a Internal energy and temperature, 2.2.2b Specific heat capacity, 2.2.3a Melting, boiling, condensation and solidification, 2.2.3b Evaporation, and 2.2.3c Cooling by evaporation. Each one has a worked solution and a mark scheme showing where the marks go.

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