Name: Section: Forms of Energy Practice Test Directions: For each of the questions or incomplete statements below, choose the best of the answer choices given and write your answer on the line. 1. What type of energy transformation is represented in the diagram below? a. chemical energy to sound energy b. electrical energy to light energy c. electrical energy to sound energy d. electrical energy to mechanical energy Questions 2 and 3 refers to the following incident. In an effort to break apart a strip of aluminum metal, Charles bent it back and forth many times. He was surprised to notice the aluminum getting warm at the point of the bend. 2. What type of energy transformation does this activity represent? a. heat energy to mechanical energy b. chemical energy to sound energy c. chemical energy to heat energy d. mechanical energy to heat energy 3. The heating of the metal strip in this case is a. a gain of energy. b. the creation of energy. c. the loss of energy. d. an undesired energy transformation.
Questions 4 and 5 refer to the following data and diagram. The lighting of matches in a matchbook illustrates several different energy transformations. 4. When you strike a match on the rough strip of a matchbook cover, you transform a. mechanical energy to heat energy. b. mechanical energy to chemical energy. c. mechanical energy to electrical energy. d. heat energy to chemical energy. 5. What type of energy transformation does the burning match represent? a. chemical energy to light and sound energy b. chemical energy to light and heat energy c. chemical energy to heat energy, only d. heat energy to light energy, only 6. Which item transforms 100 percent of the energy it receives into useful energy? a. window fan b. hair dryer c. battery-powered flashlight d. no items transfer 100 percent into useful energy 7. Water differs from most other substances because it a. expands when heated. b. contracts when heated. c. expands when it freezes. d. contracts when it freezes. 8. Placing a metal spoon with a temperature of 20 degrees Celsius into a cup of water with a temperature of 90 degrees Celsius will cause the spoon to a. increase in temperature. b. decrease in temperature. c. remain the same temperature. d. contract in size.
9. A thermos bottle keeps hot liquids warm and cold liquids cool. What kind of material is used in the construction of a thermos bottle? a. heat-conducting b. heat-insulating c. heat-expanding d. heat-contracting 10. A thermometer works on the principle that, when heated, the substance in the thermometer will a. contract. b. expand. c. remain the same size. d. release heat. 11. Which graph best shows the relationship between the temperature of a substance and the motion of molecules in the substance when it is heated? a. graph 1 b. graph 2 c. graph 3 d. graph 4 12. A cloud forms by the process of condensation. The gaseous water vapor changes into liquid water droplets. Heat is exchanged between the water and the surrounding air. What happens to the temperature of the surrounding air? a. It increases b. It decreases c. It remains the same d. It increases, then decreases
13. The bar graph below shows the average speed of sound through solids, liquids, gases, and a vacuum. Based on the graph, through which medium would sound travel fastest? a. air b. rock c. liquid water d. vacuum Read the following short paragraph and study the diagram. Then answer questions 14 through 16. Sound travels about 340 meters/second in air. Josh yelled hello across a canyon. The sound traveled across the canyon and returned as an echo. Josh heard the echo 2 seconds after he yelled hello. 14. What is the total distance the sound traveled? a. 340 meters b. 680 meters c. 1360 meters d. 170 meters
15. What is the distance across the canyon? a. 340 meters b. 680 meters c. 1360 meters d. 170 meters 16. If the canyon had been 1020 meters across, how long would it take for the echo to return to Josh? a. 5 seconds b. 6 seconds c. 3 seconds d. 12 seconds 17. When using the apparatus in the diagram at the right, a student could not hear the ringing bell after the air was pumped out of the bell jar. This demonstrates that sound waves a. can travel through the glass bell jar. b. cannot travel through the glass bell jar. c. cannot travel through a vacuum. d. can travel through a vacuum. 18. A passing train blows a whistle at a constant pitch as it approaches, crosses, and leaves a road crossing. A person standing by the road crossing hears the pitch of the whistle rise as the train approaches, and then get lower as the train passes by. The apparent change in pitch of the train whistle is caused by a. its wavelength. b. the Doppler Effect. c. the amplitude of its sound. d. different whistles on the train. 19. Sound is produced by a. expansions. b. contractions. c. reflections. d. vibrations.
20. While visiting a historic fort during his vacation, John watched a demonstration of the firing of a cannon. When the cannon fired, the sound traveled to John and he heard the sound with his ears. What is the medium of the sound waves? a. the cannon b. the air c. John s ear d. None of the above 21. A blast of dynamite set off by a roadwork crew produced a bright flash of light and a loud explosion. A person standing 2 kilometers away, with a clear view of the work site, would a. hear the sound first, then see the flash. b. see the flash first, then hear the sound. c. see the flash and hear the sound at the same time. d. hear the sound, but not see the flash. 22. We can see most objects because they a. refract light. b. reflect light. c. absorb light. d. transmit light. 23. When using the apparatus shown in the diagram below, a student could see the flame only if all three holes were lined up. What property of light does this demonstrate? a. Light rays are reflected from smooth, shiny surfaces. b. Light rays are absorbed as heat by dark-colored surfaces. c. Light rays travel in straight paths and do not bend around corners. d. Transparent objects transmit most of the light that strikes them.
24. The diagram below shows three ways that light can behave when striking a sheet of colored glass. The explanation for what is happening at position C is that the light rays are being a. reflected by the glass. b. transmitted through the glass. c. absorbed by the glass. d. blocked out by the glass. 25. Compared to the speed of light, the speed of sound is a. much faster. b. much slower. c. nearly the same. d. hard to measure. 26. A magnifying glass makes objects look larger. What happens when light passes through two transparent substances of different densities, such as air and a curved glass in a magnifying glass? a. The light rays are refracted. b. The light rays are reflected. c. The light rays are absorbed. d. The light rays travel in a straight line. 27. When white light strikes a green wall, all of the light is a. absorbed. b. absorbed, except green light, which is reflected. c. reflected. d. reflected, except green light, which is absorbed. 28. Which statement describes how sound waves and light waves are similar? a. Both waves can bend around objects. b. Both waves originate from an energy source. c. Both waves travel at the same speed. d. Both waves are a series of compressions and rarefactions.