Heat Transfer

1. Heat Transfer

2. Convection of heat only happens in • Solids • Liquids • Gases • Liquids or gases :10

3. Convection of heat is caused by • Density changes • Attraction between particles • Stirring • Energy transferred through direct contact :10

4. The average kinetic energy of particles in a substance is known as • temperature • conduction • heat • convection :10

5. Heat radiation is emitted and absorbed • From hot objects only • From cold objects only • From all objects all the time • From shiny objects only :10

7. What means of heat transfer is thought to be the driving mechanism of plate tectonics? • volcanoes • radiation • conduction • convection :10

8. What means of heat transfer does not require a medium? • radiation • conduction • convection • All methods require a medium :10

9. The energy transferred from something of higher temperature to lower temperature is known as • temperature • conduction • heat • convection :10

10. Which of the following is not a good conductor of heat? • Steel • Copper • Wood • Brass :10

11. Which of the following is not a good insulator? • Silver • Paper • Styrofoam • Wool :10

12. Convection currents result due to changes in • volume • mass • heat • density :10

13. An ice cube melts in your hand because heat energy transfers from • The ice cube to your hand • Your hand to the ice cube • Both answers are correct :10

14. The transfer of energy as heat caused by the collision of molecules is called • convection • conduction • radiation • contact :10

15. On the Fahrenheit scale, water freezes at • 0 degrees • 32 degrees • -32 degrees • -273.15 degrees :10

16. Absolute zero is based on which temperature scale? • Fahrenheit • Celsius • Kelvin • Rankine :10

17. Which has a greater average kinetic energy? • A teacup of hot water • A bathtub filled with warm water :10

18. Which has a greater total kinetic energy? • A teacup of hot water • A bathtub filled with warm water :10

19. What causes heat to flow from one substance to another? • Difference in substance • Difference in mass • Difference in temperature • Difference in volume :10

20. Warm air is rises because it is ________ than cold air. • More dense • Less dense • Has more kinetic energy • Has less kinetic energy :10

21. Steam rises in the picture below due to • Conduction • Convection • Radiation :10

22. The diagram below shows a man beside a camp fire. How does thermal energy from the camp fire reach the man? • Conduction • Convection • Radiation • Convection and radiation :10

23. The transfer of thermal energy by conduction, convection, and radiation requires a medium. • True • False :10

24. It is better to place an air conditioner at a high place so that convection currents will cause effective cooling. • True • False :10

26. The reason you can hold your fingers beside a candle flame without getting hurt is that • air convects heat well. • hot air rises. • air is a poor heat conductor. • hot-air convection currents travel upward. • all of the above :10

27. Which cools at the faster rate, a pot of boiling water left at room temperature or a pot of lukewarm water the same size left at room temperature? • The pot of boiling water • The pot of lukewarm water • Both cool at the same rate :10

28. A piece of metal will feel colder than a piece of wood at the same temperature. Why? • Metals, in general, are good heat conductors. • Metals are colder than wood. • Wood, in general, is a poor insulator. • Metal atoms are moving more slowly, on the average, than wood atoms. :10

29. Heat is the… • average amount of energy per molecule contained in an object • total amount of energy contained in an object • energy transferred between objects because of a temperature difference • amount of energy all the molecules have :10