The newest 19 of 17 written questions. Open one to see it on the real paper.
You are given a graph of temperature versus time for water in a beaker with different thicknesses of cotton wool insulation. Predict the temperature after 5 minutes if the beaker had 2 cm of insulation and explain your reasoning.
See it on the paper →Which statement is an explanation of what happens when the jar is in the refrigerator?
See it on the paper →How does thermal energy pass through the air to reach the food in method 1 and how does thermal energy pass through the bottom of the metal pan in method 2?
See it on the paper →The liquid in the thermometer is alcohol. State the physical property of alcohol that varies with temperature used in this thermometer.
See it on the paper →When lightning passes through the air, it heats the air up to 10 000 °C. State and explain what happens to the volume of the air when the temperature increases. Use ideas about molecules in your answer.
See it on the paper →Thermal energy is transferred through the glass to the ethanol. Describe how thermal energy is transferred through glass.
See it on the paper →State one difference between evaporation and boiling.
See it on the paper →Few candidates were able to state that the physical property of alcohol that varies with temperature is volume.
— Examiner report, February/March 2023, 0654/32 Q9(b)(ii) (Cambridge)
This question was answered well with most candidates explaining that the volume of air would increase due to the increase in kinetic energy of the molecules. Occasionally candidates stated that the volume of air would decrease but gave the correct effect of an increase of temperature on the energy of the molecules.
— Examiner report, February/March 2023, 0654/42 Q2(e) (Cambridge)
The few good descriptions of how thermal energy is transferred through glass mentioned conduction and stated that the increased vibrations pass from particle to particle. Less successful responses involved convection in alcohol and transfer by free electrons. Mention of the transfer of thermal energy between particles did not add enough information to that given in the question.
— Examiner report, October/November 2022, 0654/41 Q9(c)(i) (Cambridge)
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Fig. 3.2 shows two lengths of train track. Fig. 3.2 Explain why the lengths of train track are laid with small gaps between them.
State one example where the thermal expansion of a material is useful.
See it on the paper →State one example where the thermal expansion of a material is a problem.
See it on the paper →Which can cools the fastest?
See it on the paper →When the base of the metal saucepan is heated, the metal expands. State one example where the thermal expansion of a metal is a problem.
See it on the paper →In some places, the hot magma comes to the surface as lava. Some hot lava flows into water in a lake. A liquid‑in‑glass thermometer is used to measure the temperature of the water in the lake. The liquid in the thermometer rises as the water in the lake is heated. Explain why the liquid in the thermometer is able to sh...
See it on the paper →A different thermometer has no scale on it. Describe how melting ice and boiling water can be used to identify fixed points on this thermometer.
See it on the paper →Fig. 6.2 shows that more ice cubes have been added to the glass of water. Fig. 6.2 The ice cubes reduce the temperature of the water. The scale on the liquid-in-glass thermometer shows this decrease in temperature. Explain this action of the liquid-in-glass thermometer. Use ideas about particles in your answer.
See it on the paper →Describe how the structure of a liquid-in-glass thermometer is designed to make use of this property.
See it on the paper →The power cables from the power station are supported by pylons. Fig. 3.1 shows the arrangement of the cables between the pylons. Fig. 3.1 Describe the effect of cold weather on the length of the cables between the pylons.
See it on the paper →When heated, the iron rod expands. Explain in terms of the motion and arrangement of the atoms why iron expands when heated.
See it on the paper →Fig. 9.1 shows supply cables from a power station supported by pylons. The cables are suspended loosely in hot weather. Fig. 9.1 Explain why the cables must be suspended loosely in hot weather.
See it on the paper →