24. Depending on nuclear power involves some risks that include all of the following except A. generation of radioactive waste. B. production of air pollutants. C. expensive building processes. 25. An insulator is a material in which electrons are not able to move easily. A. True B. False 26. Petroleum supplies nearly 38% of all energy generated in the U.S. each year. The second highest source of energy in the U.S. is which provides approximately 25% of the energy generated in the U.S. each year. A. nuclear power B. hydroelectric power C. natural gas 27. Which substance would gain the most in temperature by the addition of an equal amount of thermal energy to the same amount of each if the specific heats of the substances are as follows? glass = 800 J/(kg oc) sand = 830 J/(kg oc) asphalt = 920 J/(kg oc) A. sand B. glass C. asphalt 28. Most nuclear power reactors A. use the heat from fission reactions to produce steam to run turbines. B. produce electricity directly from fission reactions. C. use fusion reactions to produce electricity. 29. Which type of energy would an object sitting on a shelf have? A. kinetic energy B. gravitational potential energy C. elastic energy 30. Which of the following best describes the type of energy that is stored in the food you eat? A. elastic potential energy B. gravitational potential energy C. chemical potential energy 31. Which of the following is a true statement? A. A galvanometer tums electrical energy into heat. B. An electromagnet tums electrical energy into heat energy. C. A generator turns mechanical energy into electrical energy. 32. If you need to buy a new battery for your flashlight, which type would you normally buy? A. dry cell B. wet cell C. lead acid 33. If you are using a metal pot and cooking over a fire where the pot is in contact with the fire, which process is occurring as the heat from the fire is transferred to the metal pot? A. radiation B. convection C. conduction 34. If you compare pushing a bike up a long ramp to lifting a bicycle straight up a flight of stairs to the same height, which of the following would be true? A. It would require less work to lift the bicycle up the steps. B. It would require less work to move the bicycle up the ramp. C. Less force is required to move the bike up the ramp. 35. Machines make work easier. Simple machines are all around you. Which type of simple machine would you be using if you used an ice scraper to remove ice from the windshield of a car? A. wedge B. axel C. lever 36. Which of the following is a good description of the domain found in the pole of a bar magnet? A. The domains have only south poles if they are in the north pole of a bar magnet. B. The domains have only north poles if they are in the south pole of a bar magnet. C. The domains have both north and south poles, regardless of which pole of the bar magnet they are in. c o o c o 37. When you boil water, what takes place during the boiling process? A. The pressure of the escaping vapor is greater than the air pressure. B. The liquid loses enough energy to change to a gas. C. The pressure of the vapor in the liquid is equal to the extemal pressure acting on the surface of the liquid. 38. Ohm's law is used to explain the relationship between voltage, resistance, and current. For example, how much current will a 60 Q (ohm) lightbulb have if it is powered by a 120 volt outlet? (l = VIR) A. 0.50 amps B. 2.0 amps C. 60 amps 39. Which of the following explains why a hot air balloon rises? A. When the air in the balloon is heated, the density of the hot air in the balloon decreases. B. When the air in the balloon is heated, the density of the in the balloon hot air increases. C. When the air in the balloon is heated, the particles move closer together. 40. Which of the following is true of AC electric current? A. The current reverses direction in a regular pattem. B. The current is always in the same direction. C. The current stops and starts in a regular pattem. 41. How much work are you doing when you use 6.0 N to move a 2.75 kg book a distance of 1.50 meters? (W = f d) A. zero work B. 9.0 J C. 4.125 J 42. Air is both a good thermal insulator and conductor. A. True B. False 43. An inclined plane with one sloping side that changes the direction of the input force is called a wedge. A. True B. False c .2 3 o E o 2 o Z O o g E 3 .2 8 E E