Physics Four Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. ____

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1. What happens if you break a magnet in half? a. One half will have a north pole only and one half will have a south pole only. b. Neither half will have a pole. c. Each half will be a new magnet, with both a north and south pole. d. Neither half will be able to attract or repel. 2. The region around a magnet where the magnetic force is exerted is known as its a. magnetic pole. b. lodestone. c. magnetic field. d. magnetic domain. 3. Magnetic field lines around a bar magnet a. are only perpendicular to the magnet. b. spread out from one pole and curve around to the other. c. cross back and forth over one another. d. are perfectly straight. 4. If you are in the Northern Hemisphere and see the Northern Lights, you are seeing a. an aurora. b. a magnetic field. c. the magnetosphere. d. magnetic field lines. 5. Earth’s magnetic field can make a magnet out of an iron bar by causing the magnetic domains to a. move back and forth between the north and south poles. b. create magnetic field lines. c. change the magnetic declination. d. line up in the same direction. 6. A spinning electron produces a(n) a. element. b. magnetic field. c. proton. d. piece of iron. 7. What is one way you can destroy a magnet’s magnetism? a. by putting it in water b. by cooling it c. by heating it d. by breaking it into pieces 8. What is the magnetosphere? a. a stream of electrically charged particles flowing at high speeds from the sun b. the region of Earth’s magnetic field shaped by the solar wind c. a glowing region in the atmosphere caused by charged particles from the sun d. the angle between geographic north and the magnetic pole in the Northern Hemisphere 9. The closer together a magnet’s magnetic field lines are, a. the weaker the magnetic field. b. the stronger the magnetic field.

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c. the closer they are to the magnet’s center. d. the closer they are to disappearing. An electric current produces a(n) a. magnetic field. b. magnet. c. solenoid. d. insulator. Waves that move the particles of the medium parallel to the direction in which the waves are traveling are called a. longitudinal waves. b. transverse waves. c. surface waves. d. combination waves. The bending of waves due to a change in speed is called a. reflection. b. refraction. c. diffraction. d. interference. The bending of waves around the edge of a barrier is known as a. reflection. b. refraction. c. diffraction. d. interference. The interaction between two waves that meet is called a. reflection. b. refraction. c. diffraction. d. interference. Waves combine to make a wave with larger amplitude in a process called a. destructive interference. b. constructive interference. c. reflection. d. refraction.

Short Answer Use the diagram to answer each question.

16. What does the person transfer to the rope by pulling it up and down at point A? 17. What does the direction of arrow B indicate? 18. In what direction does the medium move relative to the direction of the wave? Explain. 19. What kind of wave is being generated? 20. What does point C represent? 21. What is the medium through which the wave is moving?

Physics Four Answer Section MULTIPLE CHOICE 1. ANS: STO: 2. ANS: STO: 3. ANS: STO: 4. ANS: STO: 5. ANS: STO: 6. ANS: STO: 7. ANS: STO: 8. ANS: STO: 9. ANS: STO: 10. ANS: STO: 11. ANS: STO: 12. ANS: STO: 13. ANS: STO: 14. ANS: STO: 15. ANS: STO:

C DIF: L2 5.7.A C DIF: L2 5.7.A B DIF: L2 5.7.A A DIF: L2 5.9.D D DIF: L3 5.7.A, 5.3.B.1, 5.2.A.1.c B DIF: L1 5.6.A.1 C DIF: L2 5.7.A B DIF: L1 5.9.D, 5.1.B.3 B DIF: L3 5.7.A A DIF: L1 5.7.A, 5.7.B.3 A DIF: L1 5.7.B.2 B DIF: L2 5.7.B.2, 5.7.B.4, 5.1.B.3 C DIF: L2 5.7.B.2, 5.7.B.4 D DIF: L1 5.7.B.2, 5.7.B.4 B DIF: L2 5.7.B.2, 5.7.B.4

REF: p. N-19

OBJ: N.1.2.3

REF: p. N-9

OBJ: N.1.1.3

REF: p. N-9

OBJ: N.1.1.3

REF: p. N-27

OBJ: N.1.3.2

REF: p. N-25

OBJ: N.1.3.2

REF: p. N-15

OBJ: N.1.2.1

REF: p. N-18

OBJ: N.1.2.3

REF: p. N-26

OBJ: N.1.3.2

REF: p. N-9

OBJ: N.1.1.3

REF: p. N-81

OBJ: N.3.1.1

REF: p. O-9

OBJ: O.1.1.2

REF: p. O-19

OBJ: O.1.3.1

REF: p. O-20

OBJ: O.1.3.1

REF: p. O-20

OBJ: O.1.3.2

REF: p. O-20

OBJ: O.1.3.2

SHORT ANSWER 16. ANS: energy DIF: L2 REF: p. O-8 OBJ: O.1.1.1 17. ANS: the direction in which the wave is moving

STO: 5.7.B.2, 5.3.B.1

DIF: L2 18. ANS:

STO: 5.7.B.2, 5.3.B.1

REF: p. O-8

OBJ: O.1.1.2

The medium moves perpendicular, or at right angles, to the wave; the rope moves up and down vertically and the wave moves horizontally. DIF: L3 19. ANS: a transverse wave

REF: p. O-8

OBJ: O.1.1.2

STO: 5.7.B.2, 5.3.B.1

DIF: L2 20. ANS: a trough

REF: p. O-8

OBJ: O.1.1.2

STO: 5.7.B.2, 5.3.B.1

DIF: L2 21. ANS: the rope

REF: p. O-8

OBJ: O.1.1.2

STO: 5.7.B.2, 5.3.B.1

DIF: L2

REF: p. O-7

OBJ: O.1.1.1

STO: 5.7.B.2