1. The Earth's magnetic poles remain in fixed positions, coinciding with the geographic poles.

A. True B. False

2. Which of the following is a good description of the domains found in the south pole of a bar magnet?

A. The domains have only south poles if they are in the south 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.

3. The average kinetic energy of the particles that make up a substance is its

A. thermal energy.

B. temperature.

C. sublimation.

4. Which of the following materials would make theworstthermal insulator?

A. fiberglass

B. aluminum

C. wood

5. If a 0.25 kg ball is moving at a speed of 12 m/s what is the kinetic energy of the ball? Remember the equation: \small KE = \frac{1}{2}mv^{2}

A. 3.0 J

B. 36 J

C. 18 J

6. In the United States most of the fuel used comes from a classification called fossil fuels. What does fossil fuel refer to?

A. fuel that formed from ancient plant and animal life, representations of which are sometimes found as fossil imprints

B. a technique known as fossilization that must be used In order to obtain energy from these fuels

C. the embedded fossil remains in the fuel itself

7. When the air in the balloon is heated, the density of the hot air decreases. This causes the air inside to be less dense than the air outside, and the balloon rises. This is an example of

A. thermal expansion. B. the plasma state. C. an amorphous solid.

8. Which type of energy would an object sitting on a shelf have?

A. kinetic energy

B. gravitational potential energy

C. elastic energy

9. If you listen to a radio for 30 minutes that uses 5 watts of power, how much energy is used in that time? (E = ptand 1 kWh = 3.6 million Joules)

A. 750 J B. 900 J C. 9,000 J

10. The specific heats of some common substances are as follows: iron = 450 J/(kg C)

sand = 830 J/(kg C) water = 4,200 J/(kg C) Which substance would gain the most in temperature by the addition of an equal amount of thermal energy to the same amount of each?

A. sand B. iron C. water

11. 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

12. 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.

13. Which type of battery would you normallynotbuy for your car? A. dry cell

B. wet cell C. lead acid

14. An input force of 60 N is used to lift an object weighing 240 N with a set of pulleys. What is the mechanical advantage of the pulley system? Remember

the equation: \small MA = \frac{F_{out}}{F_{in}}

A. 2 B. 3 C.4

15. Most nuclear power plants use water and ______________ to produce steam to run the turbines that create electricity.

A. fission reactions B. fusion reactions C. hydrogen gas

16. Electrical energy is used when you use electrical appliances and is determined based on the amount of time electrical power is used . For example, how much electrical energy is used by a small refrigerator that is rated at 300 watts when used for 9.0 hours?(E = Pt)

A. 2,700 kWh B. 2.7 kWh C. 33 kWh

17. When you transfer a charge by touching or rubbing you are A. creating direct electrical current.

B. charging by contact. C. charging by induction.

18. Which of the following is a non-renewable energy source? A. solar radiation

B. hydroelectricity C. fossil fuels

19. Petroleum-based products are also used for non-fuel reasons such as A. the extraction of methane gas.

B. making some plastics and synthetic fabrics. C. distilling gasoline.

20.Woutis always equal toWinbecause when a machine is used, all of the energy it receives is used for work.

A. True B. False

21. Which of the following isnottrue of nuclear fusion? A. Nuclear fusion produces helium.

B. Nuclear fusion requires extremely high temperatures. C. Nuclear fusion reactors produce more energy than they consume.

22. Work is the process of transferring energy from one object to another; power is the rate at which the energy is transferred.

A. True B. False

23. Geothermal power plants are A. expensive to build but can be located almost anywhere. B. not often built because it is impossible to keep air-polluting sulfur

compounds from being released. C. only practical in areas where magma is close to the surface.

24. A good example of chemical potential energy is A. the energy stored in a compressed spring.

B. the energy stored between an apple on a tree and the Earth. C. the energy stored in the fuel in the gas tank of your car.

25. If a bicycle has a mechanical energy of 1,000 J at the bottom of the hill, and produced 3,000 J of thermal energy on the way down, How much mechanical energy did the bicycle have at the top of the hill?

A. 1,000 J B. 2,000 J C. 4,000 J

26. Which of the following is a true statement? A. A galvanometer turns electrical energy into heat. B. An electromagnet turns electrical energy into heat energy. C. A generator turns mechanical energy into electrical energy.

27. A current traveling through a loop of wire creates a moving electric charge that is

A. surrounded by both a magnetic and electric field. B. surrounded by an electric field. C. surrounded by a magnetic field.

28. As the distance between the north and south magnetic poles increases, the force between them

A. increases. B. decreases. C. remains constant.

29. Which principle states that if the mechanical energy of a system is constant, the increase in thermal energy of that system equals the sum of the thermal energy transferred plus the work done on the system?

A. the law of conservation of charge B. the first law of thermodynamics C. the second law of thermodynamics

30. 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.

31. An electric current that constantly flows in one direction is

A. alternating current (AC).

B. direct current (DC).

C. the output voltage.

32. 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

A. nuclear power. B. hydroelectric power. C. natural gas.

33. Which of the following best describes a series circuit? 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. C. Series circuits suit home wiring needs better than parallel circuits.

34. Ohm's law is used to explain the relationship between voltage, resistance, and current. For example, how much current will a 60 (ohm) lightbulb have if it is powered by a 120 volt outlet? (I=V/R)

A. 0.50 amps B. 2.0 amps C. 60 amps

35. Which of the following statements is true about thermal energy?

A. Thermal energy is heat that flows from something at a higher temperature to something with lower temperature.

B. Thermal energy can be measured in watts. C. A ball rolling down a hill has more thermal energy than a ball at rest.

36. Energy stored in something that can stretch or compress (such as a rubber band) is elastic kinetic energy.

A. True B. False

37. A screw is an inclined plane with one or two sloping sides that changes the direction of the input force.

A. True B. False

38. Electrical engineers use resistors to reduce the current through all or part of a circuit.

A. True B. False

39. If you have a material in which electrons are not able to move easily, it is a good conductor.

A. True B. False

40. At which point during its arc would a pendulum have the maximum amount of kinetic energy when swinging back and forth?

A. at the top of the arc, right before it changes direction B. at the bottom of the arc, when the pendulum is directly beneath what it is

fastened to C. halfway to the top of the arc, as the pendulum is rising

41. Natural gas is the most abundant fossil fuel in the world. A. True B. False

42. The process of transferring heat from a fire to a metal container during the cooking process is best described as

A. convection. B. conduction. C. radiation.

43. When a 3.0 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.9.8 m/s2C. 35 J

44. 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 external pressure

acting on the surface of the liquid.

45. What is one effect of friction? A. Mechanical energy is transformed into thermal energy.

B. Thermal energy is transformed into mechanical energy. C. Thermal energy is transformed into potential energy.

46. When you use 5.0 N to move a 1.5 kg book a distance of 0.50 meters, how much work are you doing? (W = f d)

A. zero work B. 0.75 J C. 2.5 J

47. 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 followingexcept

A. reducing your energy dependence. B. recycling paper materials. C. creating more wastewater.

48. When a DVD player plugged into a 120 volt outlet uses 2.5 amps of current how much power is being used? (P=IV)

A. 0.020 watts B. 48 watts C. 300 watts

49. Electrical power is a product of the current and the voltage difference and is expressed in watts or kilowatts.

A. True B. False

50. Air is both a good thermal insulator and conductor. A. True

B. False