1) The law of heat transfer states a) heat is neither created nor destroyed, changes form. b) Heat is destroyed. c) Heat is created 2) Conduction means a) Heat transfer by density differences.  b) Heat transfer by direct contact. c) Heat transfer by waves 3) Convection means a) Heat transfer by density differences. b) Heat transfer by direct contact. c) Heat transfer by waves 4) Radiation means a) Heat transfer by density differences. b) Heat transfer by direct contact. c) Heat transfer by waves. 5) Heat always moves from ___________ to _____________ until the substances reach the _____________ temperature. a) cold; hot; unequal b) cold ;hot ;equal c) hot; cold, unequal d) hot; cold; equal 6) Cooking an egg on a stove is an example of a) conduction b) convection c) radiation 7) hot air is _________ dense and will __________. a) more ; rise b) more; sink c) less; rise d) less; sink 8) cold air is __________ dense and will ________. a) more; rise b) more; sink c) less; rise d) less; sink 9) Hot air balloon is an example of a) conduction b) convection c) radiation 10) Which ones will transfer heat from hot to cold till the object reaches equal temperature? (choose all that apply) a) conduction b) convection c) radiation d) none of them 11) Which one is heat transfer with liquids and gases? (forms a current) a) conduction b) convection c) radiation 12) Feeling heat from the fire a) conduction b) convection c) radiation 13) Hot air from a blow dyer is a) conduction b) convection c) radiation 14) heating food in a microwave a) conduction b) convection c) radiation 15) egg cooking on a side walk a) conduction b) convection c) radiation 16) boiling water is an example a) conduction b) convection c) radiation 17) electromagnetic waves use  a) conduction b) convection c) radiation 18) cooking food in an oven is an example of a) conduction b) convection c) radiation 19) in a liquid and gas- warm substance rise and cool substance sinks is  a) conduction b) convection c) radiation 20) we feel heat through flames by a) conduction b) convection  c) radiation  21) Does this picture show heat moving correctly ?  a) Yes b) No 22) ice is placed on the concrete how does heat move? a) the cold moves to the concrete to heat the ice. b) the heat moves into the ice causing the ice to melt. c) the cold moves into the ice causing the ice to melt.

Heat transfer

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