1) Marcus and Arun go out on a sunny day. Marcus wears a white shirt, and Arun wears a black shirt. The shirts are the same apart from the color. Explain any difference in the heat that the two boys will feel when they spend the same time in the Sun. a) Marcus and Arun will not feel any heat because they are wearing shirts. b) Marcus and Arun will feel the same amount of heat because the shirts are the same apart from the color. c) Arun will feel hotter than Marcus because black shirts absorb more heat. d) Marcus will feel hotter than Arun because white shirts reflect more heat. 2) Which method transfers thermal energy through a metal cooking pan? a) Conduction b) Convection c) Radiation d) Insulation 3) Which is an example of heat being transferred through radiation? a) A metal spoon becoming hot when placed in a pot of boiling water. b) A person feeling warm when standing close to a campfire c) A pan on a hot stove conducting heat to the food in contact with it. d) Ice melting in a glass due to the surrounding room temperature. 4) Which is an example of heat being transferred through convection? a) A metal spoon becoming hot when placed in a pot of boiling water. b) A person feeling warm when standing close to a campfire c) Warm air rising near a heater and circulating through a room. d) Ice melting in a glass due to the surrounding room temperature. 5) Which is an example of heat being transferred through conduction? a) A metal spoon becoming hot when placed in a pot of boiling water. b) A person feeling warm when standing close to a campfire. c) Warm air rising near a heater and circulating through a room. d) Ice melting in a glass due to the surrounding room temperature. 6) Explain how the electric heater heats all of the water in the tank. a) The electric heater only heats the water at the top of the tank. b) The electric heater uses conduction to heat the water. c) The electric heater creates a convection current, causing the water to circulate and heat up uniformly. d) The electric heater emits radiation to heat the water in the tank. 7) Explain why hot water is removed from the top of the tank of an electric heater and not from the bottom. a) It is easier to access hot water from the top of the tank. b) Hot water accumulates at the bottom of the tank due to convection currents. c) Removing hot water from the bottom would cause the heating element to malfunction. d) Hot water naturally rises to the top of the tank because it is less dense than cold water. 8) Using particle theory, explain how conduction works. a) Particles move from one place to another, carrying heat energy with them. b) Particles vibrate in place and transfer heat to neighboring particles through direct contact. c) Particles absorb heat energy from the surroundings and become hotter. d) Particles in a material create electromagnetic waves to transfer heat energy. 9) Why does convection work well in liquids and gases but not in solids? a) In solids, convection is replaced by radiation, and the particles don't move around like in liquids and gases. b) Solids have fewer particles than liquids and gases, so convection can't happen efficiently. c) Convection doesn't work in solids because the particles are too fixed in place, and they vibrate but can't create the needed flow. d) Convection works in liquids and gases because their particles can move more freely, allowing warmer, lighter stuff to rise and cooler, denser stuff to sink. 10) Which colors and texture are the best emitters and absorbers of radiation? a) Dark colors and rough textures are the best emitters and absorbers of radiation. b) Light colors and smooth textures are the best emitters and absorbers of radiation. c) Colors and textures do not affect the emission and absorption of radiation. d) Metallic colors and shiny textures are the best emitters and reflectors of radiation. 11) How does the use of double-glazed windows in a building help conserve energy and maintain a comfortable indoor temperature? a) By preventing conduction and convection of heat between the indoors and outdoors. b) y promoting radiation between the indoors and outdoors. c) By allowing convection currents to flow freely, cooling the indoors. d) By reflecting thermal energy back into the building. 12) In a thermos flask, which method of thermal energy transfer is most effectively reduced to keep beverages hot or cold for extended periods? a) Conduction b) Convection c) Radiation d) Insulation

Y9 3.5 CC Conduction Convection Radiation

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