1) The owner wants to reduce heat loss from the workshop. Which decision about changing the design should she make? a) Have larger windows b) Have single-glazed, rather than double-glazed, windows c) Increase the temperature inside the building d) Increase the thickness of the roof insulation 2) There will be several machines in the building. All of them will have moving parts. Which statement is not correct? a) All of the machines waste some energy. b) Friction is often a cause of inefficiency. c) None of the machines is perfectly efficient. d) The total energy input is equal to the useful energy output. 3) All energy is eventually transferred to the surroundings as . . . a) electricity. b) heat. c) light. d) sound. 4) The graph shows the temperatures inside and outside the workshop. Which conclusion can be drawn? The heating in the building was . . . a) switched on at 6 am, and switched off at noon. b) switched on at 8 am, and switched off at noon. c) switched on at 6 am, and switched off at 5 pm. d) switched on at noon, and switched off at 5 pm. 5) The diagram shows a cross-section through a double-glazed window. There is an air gap between the two sheets of glass. How does thermal energy pass through a sheet of glass? a) By conduction b) By convection c) By evaporation d) By reflection 6) For the best insulation, the glass should be designed to reduce the transmission of . . . a) infra red radiation. b) microwaves. c) ultraviolet radiation. d) visible light. 7) The table shows the U-values for some double-glazed windows. The U-value relates to the rate at which thermal energy passes through the window. The lower the U-value, the better the insulation. Which combination of glass and gap width gives the best insulation? a) plain glass, 12 mm gap b) reflective glass, 16 mm gap c) reflective glass, 20 mm gap d) plain glass, 24 mm gap 8) Which one of these conclusions is correct, according to the data in the table? a) Plain glass is always better at reducing heat transfer than reflective glass. b) The wider the gap, the less heat is transferred. c) The narrower the gap, the less heat is transferred. d) The type of glass has more effect on heat transfer than the width of the gap. 9) Many homes have hot-water tanks. An electric heater is used to heat the water. Some heat (thermal energy) is lost through the metal walls to the surroundings. The energy spreads through the water by . . . a) heated water contracting and falling. b) heated water expanding and rising. c) heat rising. d) the movement of free electrons. 10) The energy is transferred through the metal walls by . . . a) heated water expanding and rising. b) infra red waves passing through the metal. c) the atoms gaining energy and moving faster through the metal. d) the movement of free electrons. 11) The metal walls of the tank transfer energy to the surroundings by . . . a) heated air contracting and falling. b) infra red waves passing through the air. c) metal atoms gaining energy and escaping into the air. d) the movement of free electrons. 12) The air in contact with the outside of the metal walls . . . a) contracts and falls due to decreased density. b) contracts and falls due to increased density. c) expands and rises due to decreased density. d) expands and rises due to increased density. 13) The diagram shows a saucepan on a hotplate. The saucepan contains soup. Some heat (thermal energy) is lost through the metal walls of the saucepan to the surroundings. The energy spreads through the soup by . . . a) free electrons colliding with ions. b) heat rising. c) the soup contracting and falling as it is heated. d) the soup expanding and rising as it is heated. 14) The energy is transferred through the metal walls of the saucepan by . . . a) free electrons colliding with ions. b) heated metal expanding and rising. c) infra red waves passing through the metal. d) the atoms gaining energy and moving faster through the metal. 15) The outer walls of the saucepan transfer energy to the surroundings by . . . a) free electrons colliding with ions. b) the air contracting and falling as it is heated. c) infra red waves passing through the air. d) metal atoms gaining energy and escaping into the air. 16) The air in contact with the outer walls of the saucepan . . . a) contracts and falls due to decreased density. b) contracts and falls due to increased density. c) expands and rises due to decreased density. d) expands and rises due to increased density. 17) The diagram shows a fan-assisted cooler designed to be fitted inside a computer. The thermal paste ensures that heat can transfer easily from the computer’s processor. The metal fins are painted black to . . . a) increase heat transfer by conduction. b) increase heat transfer by radiation. c) reduce heat transfer by conduction. d) reduce heat transfer by radiation. 18) The thermal paste is there to . . . a) decrease the transfer of heat by conduction. b) decrease the transfer of heat by radiation. c) increase the transfer of heat by conduction. d) increase the transfer of heat by radiation. 19) Which process or processes is/are aided by the fan? a) conduction only b) convection and conduction c) conduction and radiation d) radiation only 20) Which one of the following causes the heat transfer through the metal fins? a) electrons which collide with both ions and other electrons b) electrons which do not collide with either ions or other electrons c) ions which collide with both electrons and other ions d) ions which do not collide with either electrons or other ions

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