1. What happens as an electric current travels through a loop of wire? A. It creates a moving electric charge surrounded by both magnetic and electric fields. B. It creates a static electric charge surrounded by an electric field. C. It creates a magnetic field surrounded by an electric charge. 2. Our human population impacts the environment in many ways, some positive, and some negative. You can help protect the environment in many ways. These include all of the following except A. reducing your energy dependence. B. recycling paper materials. C. creating more wastewater. 3. Why are metals typically good electrical conductors? A. Metals have excellent insulator properties related to conductivity. B. Metals have electrons that can carry both the positive and negative charges needed to make electricity. C. Metals have electrons that can flow easily within the metal. 4. Which of the following statements is true about thermal energy? A. Thermal energy is heat that flows from something at a lower temperature to something with higher temperature. B. Thermal energy can be measured in newtons. C. A ball rolling down a hill has the same thermal energy as a ball at rest c o 5. Coal is the most abundant fossil fuel in the world. A. True B. False Wwt is always smaller than W because when a machine is used, not all of the 6. energy it receives is used for work. A. True B. False 7. Why are most households wired with parallel circuits instead of series circuits? A. A series circuit has many loops or paths while a parallel has only one. B. When any one part of a series circuit is disrupted, the entire current flow stops; in a parallel circuit, current will continue to flow in other branches when one part stops. C. Series circuits will only handle 120 V, when quite often 240 V is needed for electric stoves or clothes dryers. 8. If a 0.25 kg ball is moving at a speed of 6 mis what is the kinetic energy of the ball? Remember the equation: KE = mv A. 3.0 J B. 36 J C. 4.5 J 9. When a 2.0 kg science textbook is sitting on a table that is 1.2 meters above the floor, how much gravitational potential energy does the textbook have? (GPE = mgh) A. 24 J B. 2.4 J C. 9.8 m/s2 10. How much energy is used in 20 minutes of listening to music on an mp3 player that uses 9 watts of power? (E = pt and 1 kWh = 3.6 million Joules) A. 1,200 J B. 10,800 J C. 18 J 11. The average kinetic energy of the particles that make up a substance is its A. thermal energy. B. temperature. C. sublimation. 12. Energy that is stored in something that can stretch or compress is elastic potential energy. A. True B. False 13. The first law of thermodynamics can best be described by which of the following statements? A. The change in thermal energy of a system is equal to the sum of the thermal energy transferred plus the work transferred. B. The change in thermal energy of a system is equal to the difference between the thermal energy transferred minus the work transferred. C. The change in thermal energy of a system is equal to the thermal energy that is transferred to the system or from the system. 14. What happens to the force between the north and south magnetic poles as the distance between them increases? A. The force increases. B. The force decreases. C. The force remains constant. 15. Electrical power is a product of the current and the voltage difference and is expressed in watts or kilowatts. A. True B. False 16. Which of the following is considered an important non-fuel use of petroleum- based products? A. making some plastics and synthetic fabrics B. the extraction of methane gas C. distilling gasoline 17. Which of the following is a non-renewable energy source? A. solar radiation B. hydroelectricity C. fossil fuels 8 O 8 O 8 O o O o