Final Revision G 7 Physics ( ) Multiple Choice Identify the choice that best completes the statement or answers the question.

Transcription

1 Final Revision G 7 Physics ( ) Multiple Choice Identify the choice that best completes the statement or answers the question. 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 Magnetic poles that are alike A attract each other. B do not interact. C repel each other. D have the same shape. 3 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. 4 A cluster of billions of atoms that all have magnetic fields lined up in the same way is known as a A magnetic field line. B magnetic pole. C magnetic domain. D permanent magnet. 5 An example of a common ferromagnetic material is A plastic. B hydrogen. C nickel. D copper. 6 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. 7 Where is the magnetic pole in the Northern Hemisphere? A at the geographic north pole B in northern Canada C along the coast of Antarctica D at the geographic south pole. 8 Streams of electrically charged particles flowing at high speeds from the sun make up the A magnetosphere. B solar wind. C magnetic domain. D magnetic field. 9 If you are in the Northern Hemisphere and see the Northern Lights, you are seeing A a magnetic field. B an aurora. C the magnetosphere. D magnetic field lines.

2 10Earth 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 line up in the same direction. C change the magnetic declination. D create magnetic field lines. 11 Magnetism can be considered a A nuclear property. B physical property. C chemical property. D nonmetallic property. 12 A spinning electron produces a(n) A element. B magnetic field. C proton. D piece of iron. 13 What is magnetism? A the force of attraction or repulsion of magnetic materials B a property of all rocks C a type of rock D a lodestar 14 One part of a freely swinging magnet always points A east. B to Earth s geographic north pole. C toward Earth s core. D to Earth s magnetic pole in the Northern Hemisphere. 15 Which is NOT a property of magnetic field lines? A They form complete loops from pole to pole. B They can be directly observed. C They never cross. D They spread out as they get farther from the magnet. 16 Magnetic poles that are unlike A attract each other. B repel each other. C do not interact. D point in the same direction. 17 What is an electron? A a particle that carries a negative charge B a particle that carries a positive charge C a particle that does not carry an electric charge D the smallest particle of an element that has the element s properties 18 Most materials are not magnetic because A they lack magnetic fields. B their magnetism has worn off. C their magnetic domains are arranged randomly. D Earth s heat has destroyed their magnetism. 19 Every magnet, regardless of its shape, has two A magnetic poles. B magnetic charges. C magnetic fields. D magnetic domains.

3 20The magnetic properties of a material depend on its A shape. B atomic structure. C position. D magnetic poles. 21 A magnet made from a steel paperclip is most likely a(n) A permanent magnet. B temporary magnet. C electron. D lodestone. 22 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 23 A temporary magnet A keeps its magnetism for a long time. B cannot be destroyed. C easily loses its magnetism. D has two north poles. 24 What causes a compass to behave as it does? A Earth s gravity B Earth s shape C Earth s geographic north pole D Earth s magnetic field 25 As Earth s magnetic pole moves, the magnetic declination in a given location will A stay the same. B switch to point south. C change. D return to zero. 26 When molten material hardens into the rock on the ocean floor, the domains of the iron it contains A disappear. B line up in the direction of Earth s magnetic field. C point in random directions. D never become magnetic. 27 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 28 Since Earth produces a strong magnetic field, A Earth can make magnets. B Earth can attract other planets. C meteorites tend to move in Earth s direction. D the ground will repel a magnet placed upside down. 29 Which particle is not part of an atom? A proton B electron C neutron D magnetic domain

4 30The closer together a magnet s magnetic field lines are, A the weaker the magnetic field. B the stronger the magnetic field. C the closer they are to the magnet s center. D the closer they are to disappearing. Modified True/False Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true. 31 Magnetic field lines curve out from one pole and return to the same pole. 32 The magnetic domains are two regions of space above Earth s surface that contain electrons and protons traveling at high speeds. 33 Charged particles from the solar wind come closest to Earth at the equator, where Earth s magnetic field lines dip down to Earth s surface. 34 A compass behaves as it does because the moon acts as a giant magnet. 35 Nickel is a common ferromagnetic material. 36 Magnets attract iron. 37 A(n) neutron is a particle that carries a negative charge. 38 Earth itself can make magnets out of ferromagnetic materials. Completion Complete each statement. 39 When placed near each other, unlike magnetic poles each other. 40 A maglev train floats above its rails due to. 41 A magnetic is a grouping of billions of atoms that all have magnetic fields lined up in the same way. 42 An atom can act as a tiny magnet due to the spinning motion of negatively charged particles called. 43 A(n) material, such as iron, shows strong magnetic effects. 44 A(n) is the region of magnetic force around a magnet. 45 Earth s magnetism is related to the circulation of molten material within Earth s. 46 The angle between and the north to which a compass needle points is known as magnetic declination. 47 Alternating bands of magnetic materials on the sea floor show that the of Earth s magnetic field has completely reversed in the past. 48 Molten rock that formed the ocean floor contains, which lined up in the direction of Earth s magnetic field. 49 Protons and electrons have opposite. 50 A magnet made from a material that easily loses its magnetism is called a(n). 51 A(n) is made from a material that keeps its magnetism for a long time.

5 52 The is a stream of electrically charged particles flowing at high speeds from the sun. 53 A glowing region in the atmosphere caused by charged particles from the sun is called a(n). 54 The region of Earth s magnetic field shaped by the solar wind is called the. 55 A(n) is any material that attracts iron and materials that contain iron. 56 The attraction or repulsion between magnetic poles is called. 57 Magnetic spread out from one pole, curve around the magnet, and return to the other pole. 58 In a magnetized material, all or most of the magnetic domains are arranged in direction(s). Short Answer Use the diagram to answer each question. 59 What is each end of magnet A called? 60 Which end of magnet A is the magnet s north pole? How do you know? 61 What is each curved line around magnet A called? 62 Based on the diagram, where is the magnetic force around magnet A the strongest? How can you tell? 63 Which pair of magnets is arranged so that like poles are placed near each other? 64 Which pair of magnets is arranged so that opposite poles are placed near each other?

6 Final Revision G 7 Physics ( ) Answer Section MULTIPLE CHOICE 1 C 2 C 3 C 4 C 5 C 6 B 7 B 8 B 9 B 10 B 11 B 12 B 13 A 14 D 15 B 16 A 17 A 18 C 19 A 20 B 21 B 22 C 23 C 24 D 25 C 26 B 27 B 28 A 29 D 30 B MODIFIED TRUE/FALSE 31 F, opposite 32 F, Van Allen belts 33 F, magnetic poles 34 F, Earth 35 T 36 T 37 F, electron 38 T

7 COMPLETION 39 attract 40 magnetism 41 domain 42 electrons 43 ferromagnetic 44 magnetic field 45 core 46 geographic north 47 direction 48 iron 49 charges 50 temporary magnet 51 permanent magnet 52 solar wind 53 aurora 54 magnetosphere 55 magnet 56 magnetic force 57 field lines 58 the same SHORT ANSWER 59 a magnetic pole 60 the left end of the magnet, because magnetic field lines always leave a magnet s north pole 61 a magnetic field line 62 Near the poles. The magnetic field lines are closer together in those areas. 63 magnet pair B 64 magnet pair C