MAGNETISM
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…………………… is used to identify the direction of magnetic
field around a magnet
A. Ammeter
B. Voltmeter
C. Compass
D. speaker
Like poles have force called
A. Attraction
B. no force
C. constant force
D. repulsion
Magnetic domains are
A. blocks of material
B. regions of atoms magnetically aligned
C. clusters(groups) of atoms randomly aligned
D. regions that may or may not be magnetized
Magnet made with iron, nickel, cobalt are
A. non-ferromagnetic
B. transformer
C. electromagnet
D. ferromagnetic
Parts of a magnet where the magnetic forces are
strongest
A. North
B. South
C. magnetic field
D. poles
When a bar magnet is broken into half, what is the
result?
A. two north poles
B. two south poles
C. two north poles and two south poles
D. the bar loses its magnetic properties
What is magnetism?
A. force created by magnets
B. an invisible force that attracts electrically charged
particles
C. a constant force
D. energy created by magnets
Which two metals will be attracted by a magnet?
A. aluminium and lead
B. gold and silver
C. copper and cobalt
D. iron and steel
A magnet will pick up a nail,but not a penny(coin)because
the nail
A. is lighter than the penny
B. has rust on it
C. contains iron
D. has a sharp point
…………………………magnets have a North pole and South pole
A. Some
B. All
C. Broken
D. no
Magnets can only attract magnetic ……………………….
A. Boxes
B. Materials
C. Rocks
D. compasses
Magnetism is generated by moving
A. Elements
B. Protons
C. Neutrons
D. electrons
A paper clip is an example of a
A. Insulator
B. magnetic material
C. permanent magnet
D. bar magnet
14. The force of magnetism is stronger when magnets
are…………..
A. farther apart
B. cold
C. round
D. closer together
15. What do magnets stick to?
A. Copper
B. Wood
C. Plastic
D. Iron
16. Force between 2 magnets
A. Magnetic force
B. Domain Allignment
C. Electromagnetism
D. Electromagnetic induction
17. Parts of a magnet where the magnetic effects are
strongest
A. Magnetic field
B. Solenoid
C. Poles
D. Magnetite
18. Device that changes electrical energy into mechanical
energy
A. Transformer
B. Electric Generator
C. Electric Motor
D. Solenoid
19. Produced by a coil of current-carrying wire wrapped
around a soft iron core.
A. Step down Transformer
B. Electromagnet
C. Electric Generator
D. Step up Transformer
20. Magnet made with iron, nickel, or cobalt
A. Ferromagnet
B. Solenoid
C. Transformer
D. Electromagnet
21. British scientist who discovered that a changing
magnetic field can produce an electric current.
A. Faraday
B. Mr. McRae
C. Edison
D. Oersted
22. A tiny region ion a magnet where all the atoms are
grouped together and their poles are aligned.
A. Commutator
B. North
C. South
D. Domain
23. Region around a magnet in which magnetic force can act.
A. Magnetic field
B. Perimeter
C. Domain
D. Magnetic force
24. Device that increases or decreases the voltage of an
alternating current
A. Switch
B. Electric Motor
C. Galvonometer
D. Transformer
25. Material that attracts iron or materials containing iron
A. Generator
B. Compass
C. Fillament
D. Magnet
26. Scientist think that Earth's magnetic field is made by:
A. Movement of electric charges
B. Earth's attraction to the sun
C. Layers of the earth
D. Enabled Wifi
27. When a bar magnet is broken in half, what is the result?
A. The bar loses its magnetic properties
B. Two south poles
C. Two north poles
D. Two north poles and two south poles
28. Passing a current through a piece of wire causes a
magnetic field to form around the wire.
A. True
B. False
29. Are ALL metals magnetic?
A. Yes
B. No
30. A magnet's magnetic field exists ________.
A. Around the entire magnet
B. Only on the south pole
C. Only on the north pole
D. On both poles
31. Opposite poles _____ .
A. are balanced
B. push away
C. transfer electrons
D. attract
32. What part of an atom is the most responsible for
magnetism?
A. Electron
B. Neutron
C. Proton
33. What is magnetism?
A. A force created by magnets
B. An invisible force that attracts electrically charged
particles
C. A contact force
D. Energy created by magnets
34. When two magnets attract, they ______________
A. change color
B. pull together
C. push apart
D. get colder
35. Magnets have a north and a south ___________
A. color
B. shape
C. region
D. pole
36. What would we call a nail that can pick up a paperclip
because it is touching a magnet?
A. poles
B. force
C. temporary magnet
D. detector
37. The force of magnetism is stronger when magnets are
________________
A. closer together
B. round
C. farther apart
D. cold
38. Why does a compass always point north?
A. The needle is a magnet and it aligns itself with the
Earth's magnetic fields
B. Earth is a magnet and it attracts all metal objects
towards the north
C. All magnets have a north and south pole
D. Earth's south pole does not have a magnetic pull
39. What would increase the strength of an electromagnet?
A. Inserting a wooden core inside the coil
B. Increasing the amount of current flowing through
the wire.
C. Decreasing the number of coils of wire
D. Changing the direction of the current
40. What is needed to make a simple electromagnet?
A. sound
B. battery
C. ight energy
D. copper wire
41. What force does a magnetic field apply without actually
touching the object?
A. gravity
B. a push or pull
C. friction
D. pressure
42. Surrounding every magnet is a __________
__________.
A. magnetic field
B. an enemy
C. another magnet
D. electrical current
43. If I were to try to connect the north pole of one magnet
to the north pole of another magnet, the two poles
would:
A. repel
B. flip
C. neither
D. attract
44. If I were to try to connect the north pole of one magnet
to the south pole of another magnet, the two poles
would:
A. flip
B. attract
C. neither
D. repel
45. Which subatomic particle has a negative charge?
A. Enlighton
B. Neutron
C. Electron
D. Proton
46. What will happen to these two magnets?
A. they will repel
B. they will attract
47. A magnet has to touch an object to cause a force.
A. True
B. False
48. Where is the force of attraction the strongest on a
magnet?
A. it is the same throughout the magnet
B. the poles
C. the center
49. Insulators...
A. keep electrons warm.
B. prevent the flow of electrons
C. resist electrons but allow some to flow.
D. allow electrons to flow.
50. Brass, copper, and aluminum...
A. are not magnetic
B. are magnetic
51. Many metals are...
A. resistors because the only let some electrons flow.
B. conductors because they allow the electrons to flow
C. insulators because they prevent the flow of electrons
52. In an electrical circuit the electrons flow from which
end of the battery?
A. both ends
B. the negative end
C. the electrons don't flow, the protons do
D. the positive end
53. What kind of material is attracted to a magnet?
A. silver
B. iron
C. water
D. all metals
54. Electricity is the flow of _________.
A. Electrons
B. Neutrons
C. Protons
55. What would happen if you broke a magnet in half?
A. It would become a stronger magnet
B. You would have two new pieces which would have a
north and south pole
C. Neither pole would be magnetic anymore
D. You would have two magnets, one with only a north
pole and the other with only a south pole
56. How is a permanent magnet DIFFERENT from a
temporary magnet?
A. A permanent magnet has a magnetic field.
B. A permanent magnet has poles.
C. A permanent magnet attracts materials made of iron.
D. A permanent magnet keeps its magnetism for a long
time.
57. Which is a permanent magnet?
A. sandstone
B. a magnetized paper clip
C. a refrigerator magnet
D. a magnetized iron nail
58. Earth acts like a giant magnet because its center is made
up MOSTLY of
A. nickel
B. limestone
C. iron
D. granite
59. Where is the strongest attraction force of the magnet?
A. above the magnet
B. in the middle
C. below the magnet
D. at the poles
60. Magnetism is generated by moving
A. electrons.
B. neutrons.
C. elements.
D. protons.
61. As the distance between two magnets increases (they
get farther apart), the force between them:
A. Decreases
B. Stays the Same
C. Increases
62. What characteristics do magnetic substances have?
A. They are always black and cold to touch
B. They can push or pull objects without touching them
C. They fall faster than other objects when you drop
them
D. They can give you a "shock" when you touch them
63. If you cut a magnet in half, what happens to the poles?
A. One half gets the North Pole, the other half gets the
South Pole
B. Both halves get a North pole and a South Pole
C. Both halves get only a North Pole
D. Both halves get only a South Pole
64. If a glass plate is placed over a magnet and iron filings
are sprinkled over the glass, a pattern will be visible.
What does this pattern indicate?
A. The magnetic field
B. The chemical reaction of the magnet and the filings
C. The piezoelectric effect
D. The electrostatic field
65. What causes magnetism?
A. moving charges
B. moving neutrons
C. friction
D. the sun
66. On Earth, where is Magnetic North approximately
located?
A. The Equator
B. The North Pole
C. New Brighton
D. The South Pole
67. Magnetic force can pass through many materials (paper,
plastic, etc.)
A. True
B. False
68. A bar magnet was placed deep inside a sack of coal. Fine
particles of coal got stuck to it. From this, can we infer
that coal is attracted towards a magnet?
69. Where are the poles of a disc magnet located?
70. What will you see if the above experiment is done using a
coir rope?
71. In the above experiment, what will you observe if the
poles were interchanged?
72. What difference will you see if an iron bar were
suspended in place of the bar magnet?
73. Answer the following questions.
a) Classify the following substances as magnetic or nonmagnetic : copper, phosphorus, iron, cobalt, soil,
water, silver mercury, nickel, wood, oil.
b) In olden times, how as a magnet placed in a compass?
74. What are the special advantages of a horse-shoe
magnet?
75. Match the following.
‘A’
‘B’
(a) Compass
1.
Maximum
magnetic
strength
(b) Cupboard
2. Like poles
(c) Repulsion
3. Bar magnet
(d) Magnetic poles
4. Magnetic needle
76. Fill in the blanks.
a) There is magnetic ………… between like poles.
b) Stainless steel is a ………… substance.
c) There is mutual attraction between ………… poles of
magnets.
d) There is maximum magnetic force near the ………… of
a magnet.
77. Give reasons.
a) A magnetic needle comes to rest in the north-south
position.
b) A magnetic needle is used in a mariner’s compass.
c) If a bar magnet is suspended vertically it does not
hang in the north-south direction.
d) Repulsion rather than attraction is the test for
identifying a magnet.
Answer Key
1. d
2. c
3. a
4. c
5. c
6. c
7. c
8. d
9. d
10. d
11. c
12. c
13. d
14. a
15. c
16. d
17. d
18. d
19. d
20. a
21. c
22. d
23. a
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a
a
c
b
a
b
a
c
b
d
c
c
b
b
b
b
d
b
a
a
b
c
b
68. We know that coal is a non-magnetic material and so, it
does not get attracted towards a magnet. If a bar
magnet is placed inside a sack of coal, fine particles of
coal get stuck to it due to the adhesive force between
them.
69. The poles of a disc magnet are located on its opposite
faces.
70. If the mentioned experiment is done with the help of
coir rope, then bar magnet does not come to rest
properly along the north-south direction because
twisting is very less in a coir rope.
71. If the poles are interchanged in the experiment, we will
observe the same phenomena as follows:
(i) Similar magnetic poles repel each other.
(ii) Opposite magnetic poles attract each other.
72. If an iron bar is suspended in place of the bar magnet,
we will observe that there will be attraction for both
the poles of the bar magnet.
73. (a)
Magnetic
Non-magnetic substances
substances
Iron,
Phosphorus, soil, water, silver,
cobalt,
mercury, wood, oil, copper
nickel
(b) A compass consists of a tiny pivoted magnet, usually
in the form of a pointer or a needle that can turn freely
in the horizontal plane. But in old times, the needles
were magnetized by stroking them with a lodestone (a
special form of the mineral magnetite) that aligned
itself with the Earth's magnetic field. The needle did
not keep its magnetism permanently, so a lodestone was
carried on the ship so that the needle could be stroked
whenever the magnetism wore off.
74. The special advantages of horse−shoe magnet are:
a) They produce a strong magnetic field.
b) They produce a uniform magnetic field between
their arms.
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75.
‘A’
(a) Compass
(b) Cupboard
(c) Repulsion
(d) Magnetic poles
b
b
b
a
b
b
b
a
b
d
c
c
d
a
a
b
b
a
a
d
a
‘B’
4. Magnetic needle
1.Maximum magnetic strength
2. Like pole
3. Bar magnet
76. (a) There is magnetic repulsion between like poles.
(b) Stainless steel is a magnetic substance.
(c) There is mutual attraction between unlike poles of
magnets.
(d) There is maximum magnetic force near the poles of a
magnet.
77. (a) The Earth and a magnetic needle, both have magnetic
property. Similar to a magnetic needle, the Earth has
two magnetic poles, North pole and South pole. When
there is an interaction between the magnetic poles of
the Earth and the magnetic needle, the North pole of
the Earth attracts the South pole of the magnetic
needle, and the South pole of the Earth attracts the
North pole of the magnetic needle. Hence, the magnetic
needle comes to rest in the North−South position.
(b) It is difficult for a mariner to find direction while
travelling through the sea or ocean. The magnetic needle
always stays in North−South direction. Hence, using the
magnetic needle in the mariner’s compass helps them to
find direction easily.
(c) If a bar magnet is suspended vertically, it does not
hang in North−South direction because in this position
the magnetic field of the Earth is perpendicular to the
magnetic field of the bar magnet.
So, there is no attraction between the Earth and the bar
magnet.
(d) A magnet attracts a magnet as well as magnetic
substances whereas repulsion is produced only between
magnets. Hence, repulsion rather than attraction is the
test for identifying a magnet.
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6.
A magnet is something that will attract magnetic
materials.
Magnetic materials include the metals iron, steel, nickel
and cobalt.
Magnets have two poles, north and south.
Two ways to detect a magnetic field.
 see whether a magnetic object moves because of
attraction.
 use a compass.
The rules are that magnetic field lines:
 join opposite poles
 have arrows that point N→ S
 must not touch each other
 must not cross each other.