Heat Transfer · CAPE Physics Unit 1

76 past-paper questions on Heat Transfer, part of Thermal and Mechanical Properties of Matter, from every CAPE Physics Unit 1 paper on Quelpr.

1. Q321 mark · multiple choice· CAPE Physics Unit 1 · 2007 · Paper 1A spherical blackbody of surface area A is at an absolute temperature T_1. It is suspended at the centre of a container whose walls are at temperature T_2. The NET rate of loss of heat by radiation from the body…
2. Q371 mark · multiple choice· CAPE Physics Unit 1 · 2007 · Paper 1A double layer glass wall has a layer of air trapped between it as shown in the diagram below. Which method of heat transfer is SIGNIFICANTLY reduced by the air layer?
3. Q341 mark · multiple choice· CAPE Physics Unit 1 · 2007 (Specimen) · Paper 1Item 34 refers to the following diagram. A brick wall 10\text{ m} long by 4\text{ m} high is insulated with a material of thermal conductivity 0.70\text{ W m}^{-1}\text{ K}^{-1}. If the insulating material is…
4. Q341 mark · multiple choice· CAPE Physics Unit 1 · 2008 (Rest of Region) · Paper 1A solar furnace has a concave mirror of collecting area 0.80\text{ m}^2 and the average thermal radiation from the sun reaching the earth is about 750\text{ W m}^{-2}. A small object with heat capacity of…
5. Q371 mark · multiple choice· CAPE Physics Unit 1 · 2008 (Rest of Region) · Paper 1Which statement BEST explains the occurrence of convection currents?
6. Q371 mark · multiple choice· CAPE Physics Unit 1 · 2008 (T&T) · Paper 1Metals are generally better thermal conductors than non-metals because
7. Q381 mark · multiple choice· CAPE Physics Unit 1 · 2008 (T&T) · Paper 1The composite bar shown below has a uniform cross-sectional area and is composed of 2 uniform bars, A and B, of the same length placed in good thermal contact. The rod is well lagged and the ends are maintained at…
8. Q391 mark · multiple choice· CAPE Physics Unit 1 · 2008 (T&T) · Paper 1Which of the following methods of heat transfer occurs as a consequence of a change of density of a substance?
9. Q401 mark · multiple choice· CAPE Physics Unit 1 · 2008 (T&T) · Paper 1The temperature inside a furnace is 627\text{ }^\circ\text{C}. At the centre of the furnace is a cube of sides 0.5\text{ m} with temperature 27\text{ }^\circ\text{C}. What is the rate of heat transfer between the…
10. Q361 mark · multiple choice· CAPE Physics Unit 1 · 2009 · Paper 1An insulated composite metal rod consists of 30\text{ cm} of Metal A with a conductivity of 300\text{ W m}^{-1}\text{ K} and 30\text{ cm} of Metal B with a conductivity of 200\text{ W m}^{-1}\text{ K}. An…
11. Q371 mark · multiple choice· CAPE Physics Unit 1 · 2009 · Paper 1A large metal cube has dimensions 1.2\text{ m} \times 1.2\text{ m} \times 1.2\text{ m}. It is heated in a furnace until the blackened cube is at a temperature of 780\ ^\circ\text{C}. What is the rate of energy…
12. Q361 mark · multiple choice· CAPE Physics Unit 1 · 2010 · Paper 1A composite conductor with materials of thermal conductivities k, k/2, k/3 has insulated sides. Heat is transferred through it from left to right as shown in the diagram below. Each material has the same…
13. Q371 mark · multiple choice· CAPE Physics Unit 1 · 2010 · Paper 1A contractor builds an office window of height 150\text{ cm} and width 200\text{ cm} with a glass pane of thickness 0.5\text{ cm}. The temperature difference across the glass is 15\text{ K} and the thermal…
14. Q381 mark · multiple choice· CAPE Physics Unit 1 · 2010 · Paper 1A small black sphere has an absolute temperature T_1. It is hung in the centre of an enclosure whose walls are at a higher absolute temperature T_2. The net rate of gain of thermal energy by the sphere is…
15. Q371 mark · multiple choice· CAPE Physics Unit 1 · 2011 · Paper 1A contractor builds an office window of height 150\text{ cm} and width 200\text{ cm} which contains a glass pane of thickness 0.5\text{ cm}. The temperature difference across the glass is 15\text{ K} and the…
16. Q361 mark · multiple choice· CAPE Physics Unit 1 · 2012 · Paper 1Item 36 refers to a composite conductor with materials of thermal conductivities, k, k/2, k/3, which has insulated sides. Heat is transferred through it from left to right as shown in the diagram below. Each…
17. Q371 mark · multiple choice· CAPE Physics Unit 1 · 2012 · Paper 1A contractor builds an office window of height 150\text{ cm} and width 200\text{ cm} with a glass pane of thickness 0.5\text{ cm}. The temperature difference across the glass is 15\text{ K} and the thermal…
18. Q371 mark · multiple choice· CAPE Physics Unit 1 · 2013 · Paper 1Metals are generally better thermal conductors than non-metals because
19. Q381 mark · multiple choice· CAPE Physics Unit 1 · 2013 · Paper 1Which of the following methods of heat transfer occurs as a consequence of a change in density of a substance?
20. Q391 mark · multiple choice· CAPE Physics Unit 1 · 2013 · Paper 1A small black sphere has an absolute temperature T_1. It is hung in the centre of an enclosure whose walls are at a higher absolute temperature T_2. The net rate of gain of thermal energy by the sphere is…
21. Q341 mark · multiple choice· CAPE Physics Unit 1 · 2014 · Paper 1Item 34 refers to a composite conductor with materials of thermal conductivities, k, k/2, k/3, which has insulated sides. Heat is transferred through it from left to right as shown in the diagram below. Each…
22. Q371 mark · multiple choice· CAPE Physics Unit 1 · 2014 · Paper 1A contractor builds an office window of height 150\text{ cm} and width 200\text{ cm} with a glass pane of thickness 0.5\text{ cm}. The temperature difference across the glass is 15\text{ K} and the thermal…
23. Q381 mark · multiple choice· CAPE Physics Unit 1 · 2014 · Paper 1Covering a bowl of hot soup with a plate reduces heat loss by I. conduction II. convection III. evaporation
24. Q331 mark · multiple choice· CAPE Physics Unit 1 · 2015 · Paper 1The thermal conductivity, k, of a material in the form of a uniform cylinder is to be determined from the rate of linear heat flow, P, its cross-sectional area, A, and the temperature gradient, G (where…
25. Q381 mark · multiple choice· CAPE Physics Unit 1 · 2015 · Paper 1Which of the following methods of heat transfer occurs as a consequence of a change in the density of a substance?
26. Q421 mark · multiple choice· CAPE Physics Unit 1 · 2015 · Paper 1A small black sphere has an absolute temperature, T_1. It is hung in the centre of an enclosure whose walls are at a higher absolute temperature, T_2. The net rate of gain of thermal energy by the sphere is…
27. Q361 mark · multiple choice· CAPE Physics Unit 1 · 2016 · Paper 1The circular opening of a furnace has a radius of 6 \times 10^{-2}\text{ m} at 1450\text{ K}. It emits radiation equivalent to 60\% of that for a perfect black body radiator at the same temperature. What is the…
28. Q371 mark · multiple choice· CAPE Physics Unit 1 · 2016 · Paper 1A contractor builds an office window of height 150\text{ cm} and width 200\text{ cm} with a glass pane of thickness 0.5\text{ cm}. The temperature difference across the glass is 15\text{ K} and the thermal…
29. Q361 mark · multiple choice· CAPE Physics Unit 1 · 2017 · Paper 1Which of the following statements are true about the process of thermal conduction in metals? I. Electrons play a major role in the conduction process. II. Adding moisture to an object increases its rate of thermal…
30. Q371 mark · multiple choice· CAPE Physics Unit 1 · 2017 · Paper 1Item 37 refers to a composite conductor with materials of thermal conductivities, k, k/2, k/3, which has insulated sides. Heat is transferred through the conductor from left to right as shown in the diagram below.…
31. Q381 mark · multiple choice· CAPE Physics Unit 1 · 2017 · Paper 1The rate of energy radiated by a perfectly black body is proportional to
32. 3(c)(i)1 mark· CAPE Physics Unit 1 · May/June 2021 · Paper 2Complete Row 3 of Table 2 by calculating and filling in the values for T⁴ / K⁴ (×10⁹).
33. 3(c)(iii)5 marks· CAPE Physics Unit 1 · May/June 2021 · Paper 2Determine the gradient of the graph plotted on page 17 and hence deduce the surface area of the metal sphere.
34. 3(d)7 marks· CAPE Physics Unit 1 · May/June 2021 · Paper 2Describe the mechanism of thermal conduction in metallic conductors.
35. 3(d)(i)4 marks· CAPE Physics Unit 1 · May/June 2023 · Paper 2Show that the ratio of the temperature drop across each of the layers is inversely proportional to the ratio of the thermal conductivities of the layers, given that both layers are of the same thickness.
36. 3(d)(ii)1 mark· CAPE Physics Unit 1 · May/June 2023 · Paper 2State ONE application of thermal insulation, other than the application described in (d).
37. 3(b)2 marks· CAPE Physics Unit 1 · May/June 2025 · Paper 2Distinguish between heat transfer by conduction and heat transfer by convection.
38. 3(d)4 marks· CAPE Physics Unit 1 · May/June 2025 · Paper 2Assuming a human has 0.03 m thickness of body fat and skin with a total surface area of 1.7 m², calculate the heat reaching the skin in half-hour if the body temperature is 37 °C and skin surface temperature is 34 °C…
39. 6(a)7 marks· Physics · Unit 1 Q6 6(a)Discuss how the principles of conduction, convection, radiation and the greenhouse effect are applied in the design of this type of solar panels.
40. 6(a)6 marks· Physics · Unit 1 Q6 6(a)Explain how the 'greenhouse effect' contributes to the warming of the Earth's atmosphere.
41. 6(a)(i)1 mark· Physics · Unit 1 Q6 6(a)(i)Explain in terms of the kinetic theory how this radiation is able to warm a distant cold body.
42. 6(a)(i)1 mark· Physics · Unit 1 Q6 6(a)(i)Write a formula relating P to the inside and outside temperatures of the material, θ₁ and θ₂, and the thickness, x.
43. 6(a)(ii)5 marks· Physics · Unit 1 Q6 6(a)(ii)Use the graph to find the rate of flow of thermal energy when x = 2.5 cm and when x = 4.5 cm.
44. 6(a)(ii)5 marks· Physics · Unit 1 Q6 6(a)(ii)Explain this 'greenhouse effect'.
45. 6(a)(iii)3 marks· Physics · Unit 1 Q6 6(a)(iii)Use the gradient of the graph to find the thermal conductivity of the material.
46. 6(a)(iv)2 marks· Physics · Unit 1 Q6 6(a)(iv)Sketch the graph which would have been obtained if P were plotted against x instead of 1/x.
47. 6(b)5 marks· Physics · Unit 1 Q6 6(b)Calculate the rate of heat conduction through the glass.
48. 6(b)4 marks· Physics · Unit 1 Q6 6(b)Estimate the net rate of heat loss from his body after just entering the room.
49. 6(b)(i)3 marks· Physics · Unit 1 Q6 6(b)(i)Sketch a graph to show how the temperature would vary across the wall.
50. 6(b)(i)1 mark· Physics · Unit 1 Q6 6(b)(i)Calculate the rate of the heat conduction through the stove wall.
51. 6(b)(ii)2 marks· Physics · Unit 1 Q6 6(b)(ii)Calculate the thickness of brick which would have the same insulating effect as 5 cm of foam.
52. 6(b)(ii)1 mark· Physics · Unit 1 Q6 6(b)(ii)Calculate the net rate of heat loss by radiation from the stove, assuming it acts as a black body.
53. 6(b)(iii)3 marks· Physics · Unit 1 Q6 6(b)(iii)Determine the rate at which heat energy would pass through each square metre of this composite wall.
54. 6(b)(iii)10 marks· Physics · Unit 1 Q6 6(b)(iii)Calculate the heat the stove loses by a combination of conduction and convection in the surrounding air. Explain your answer.
55. 8(a)3 marks· Physics · Unit 1 Q8 8(a)Discuss the nature of the processes by which a hot body may lose heat to the surroundings.
56. 8(a)(i)8 marks· Physics · Unit 1 Q8 8(a)(i)State and explain the processes by which a hot body can lose heat to the surroundings.
57. 8(a)(i)1 mark· Physics · Unit 1 Q8 8(a)(i)Write the formula for linear heat flow by conduction explaining EACH of the terms in the equation carefully.
58. 8(a)(i)8 marks· Physics · Unit 1 Q8 8(a)(i)Name the process by which heat is supplied to the gas at C via the copper rod at B.
59. 8(a)(i)8 marks· Physics · Unit 1 Q8 8(a)(i)State TWO mechanisms which enable thermal conduction to take place in a metal.
60. 8(a)(ii)8 marks· Physics · Unit 1 Q8 8(a)(ii)Explain why only one of the mechanisms is responsible for thermal conduction in an insulator.
61. 8(a)(ii)1 mark· Physics · Unit 1 Q8 8(a)(ii)When measuring the thermal conductivity of a sample of metal in the form of a cylinder it is usual for the cylinder to be about 20 cm long with a diameter of about 3 cm. Outline THREE reasons why these dimensions are…
62. 8(a)(iii)8 marks· Physics · Unit 1 Q8 8(a)(iii)State the conditions that must be satisfied before the expression may be applied.
63. 8(a)(iii)8 marks· Physics · Unit 1 Q8 8(a)(iii)What is the MAIN potential source of error in an experiment like this and how is it overcome?
64. 8(a)(iii)8 marks· Physics · Unit 1 Q8 8(a)(iii)Why must the copper rod be lagged and the piston light and frictionless?
65. 8(b)7 marks· Physics · Unit 1 Q8 8(b)Calculate the time it will take for the beaker and its contents to be heated through 20°C.
66. 8(b)5 marks· Physics · Unit 1 Q8 8(b)Calculate the surface temperature of the hot plate, which is in contact with the pot. (Coefficient of thermal conductivity, k, for stainless steel = 50.2 W m⁻¹K⁻¹)
67. 8(b)(i)5 marks· Physics · Unit 1 Q8 8(b)(i)Explain why a sheet of glass is used on the collector.
68. 8(b)(i)1 mark· Physics · Unit 1 Q8 8(b)(i)Sketch a graph to show how the temperature varies across the wall of the box.
69. 8(b)(ii)1 mark· Physics · Unit 1 Q8 8(b)(ii)The main component in the collector is the blackened copper sheet. Explain its function.
70. 8(b)(ii)1 mark· Physics · Unit 1 Q8 8(b)(ii)The thermal conductivity of plywood is 0.24 W m⁻¹ K⁻¹ whilst that of the plastic foam is 0.012 W m⁻¹ K⁻¹. Calculate the thickness of a piece of plywood which would have the same insulating effect as 1 cm of foam.
71. 8(b)(iii)1 mark· Physics · Unit 1 Q8 8(b)(iii)Explain why a pump is not required to circulate the water in the storage tank.
72. 8(b)(iii)12 marks· Physics · Unit 1 Q8 8(b)(iii)Using this equivalent thickness, or otherwise, find the rate of conduction of heat through a rectangular wall of the box which is 0.6 m by 0.4 m and deduce the temperatures at the two interfaces between plywood and…
73. 8(c)1 mark· Physics · Unit 1 Q8 8(c)Table 3 shows the micro-voltmeter readings, V, obtained when the sphere was maintained at various temperatures and the thermopile was a distance r from it. The voltage, V, of the thermopile is proportional to the…
74. 8(c)(i)7 marks· Physics · Unit 1 Q8 8(c)(i)Suggest how the intensity of radiation reaching the thermopile varies with the absolute temperature, T, of the sphere.
75. 8(c)(ii)7 marks· Physics · Unit 1 Q8 8(c)(ii)Determine the values of r₃ and V₂.
76. 9(a)(iii)1 mark· Physics · Unit 1 Q9 9(a)(iii)Explain how coastal winds are generated in the Caribbean.