Download A Wood C Ceramic D N/etal ( ) A Aluminium B Copper C Gold ( )

Danyal Education
Magnetism Assignment 4 (Pure)
Unit
U 3.
A Aluminium
C Gold
A
C
B
D
Copper
Cobalt
Steel
C
D
andZ only
B
1 and 3 only
D
1,2 and 3
attracts to an iron.
points to the north.
repels the S-pole of a magnet.
attracts the S-pole of a
(
)
1. repel each other because the unknown pole is a N-pole.
2. repel each other because the unknown pole is a S-pole.
3. attract each other because the unknown pole is a S-pole.
()
Which statement(s) is/are correct?
A lonly
C land3only
magnet.
(
)
ny
A attracts all metal
B attracts another magnet.
Da
The compass needle is a magnet wrth the pointer as the
south seeking pole.
C
The compass needle rs a magnet with the pointer as the
north seeking pole.
The compass needle is an electromagnet that is charged
by rubbing when the needle is
)
()
turning. (
\\,
0 12. When one end of a magnet is placed near a compass, the
The needle of a plotting compass is made of
pointer (N pole) of the compass turns and points at the
steel
D tungsten (
When a bar magnet is suspended freely,
B
D
C attracts a piece of iron.
D repels a compass needle.
B
)
u 11. Why does a compass needle always point to the north?
A The compass needle is made of a magnetic material.
A metal bar is confirmed to be a magnet when it
A copper
C iron
B 2only
D 2and3only (
IV
al
B
C
D
there will be attraction between the two p0les.
there will be repulsion between the two poles.
pole of another magnet, the two magnets
2and3 only
1
When the N-pole of a magnet is placed near the S-pole of
another magnet,
A the N-pole will be attracted to the S-pole.
B the S-pole will be attracted to the N-pole.
()
To locate the S-pole of a compass, find the end of the compass
A
d 7.
g\\, 9.
(
U 10. When the S-pole of a magnet is placed near an unknown
Copper
Nickel
needle that
d 6.
)
Which of the following is a magnetic material?
1
d 5.
(
Which of the following is a magnetic materral?
2.
3.
d 4.
Plastic
D N/etal
poles of the magnet.
at
io
d 2.
B
A
B ends of the magnet.
C centre of the magnet.
D one-quarter distance from the poles of the magnet.
Which of the following group of materials is possible to ftnd
magnetic material?
A Wood
C Ceramic
A magnet is strongest near the
Ed
uc
d,
d B.
167
:.1;.:;1.;::t,:1.iy.:t
n
For each of the questions, there are four possible choices.
Choose the one you consider correct and record your choice.
19 I
-.
magnet because
)
A the pointer points at any end of a magnet.
B the end near the compass is a N-pole.
C
D
A it will point to the north-south direction.
B it will point to the east-west direction.
the end near the compass is a S-pole.
a magnet always attracts the pointer of a compass.
)
C it will not point to a ixed direction.
D either end of the bar magnet will point to the north.
f
(
Theme
5 I El*r:tricitv *n* &lofinetisn'l
M
0 13. When one end of an iron rod is placed near a compass,
A the N-pole of the compass needle always point towards
g\\, 19. A magnet is placed near an iron rod as shown. What is
the magnetic pole induced at X? What is the name of the
process?
it.
B
the S-pole of the compass needle always point towards
C
D
it.
any pole of the compass needle may point towards it.
the compass needle will not be affected by the iron rod.
iron rod
x
()
A
B
g\, 14. Which of the following does not usually use a permanent
magnet?
A
C
plotting
electric
C
D
compass B motor
bell
D ammeter (
M
M
CI
()
M
0 16. What is the reason to prvot the compass needle on a sharp
A To mrnimise the magnetrc effect on the pin.
B To maximise the magnetic effect on the pin.
C
To minimise the
To ensure that the compass needle
the prvoted
point.
will not drop
(
Da
ny
al
this process?
,l
u
(
\V
bar. The N-pole of the magnet is close t0 the centre Y of the
steel bar as shown. What are the poles induced in the steel
bar at X, Y and Z?
)
x
AA magnet attracts an iron rod.
BA magnet attracts another magnet.
CA magnet repels another magnet.
DA compass needle points to the magnetic north pole of
{)
()
0 21. Ihe diagram shows a magnet being used to pick up a steel
Which of the following is an example of magnetic inductron?
th e Earth.
Bepels to the right
B Attracts to the left
C Falls off from the magnet
D Remains stationary
)
magnetic material becomes a magnet. What is the name of
A electromagnetic rnductlon
B electrostaticinduction
C magnetic induction
D electromagnetism
A
from
d 17. When a magnet is placed near a magnetic matelal, the
d
s
friction between the pin and the compass
need le.
D
The diagram below shows a magnet attracting three steel
pins while another magnet is approachrng slowly from the
left. What will happen to the string of attracted pins?
Ed
pi n?
20.
()
nduction
uc
at
C
D
S-pole
S-pole
i
a magnet?
Find out if the material is a metal or a non-metal.
Find out if the material is a conductor or a non-conductor.
Find 0ut if the material can be attracted t0 a steel plate.
Find out if the material can be repelled by a compass.
Name of process
magnetic induction
electromagnetic
induction
magnetic induction
electromagnetic
N-pole
N-pole
)
0 15. What should a student do to find out whether a material is
A
B
N/agnetic pole at X
ion
168
Pole
X
NNN
NSN
SNS
SSS
induced at
A
B
C
D
Y
Pole
Y
induced at
Z
Pole
induced at Z
()
UnitlgI'' ,..',.:169
t\,
s 22. Ihe diagram shows a magnet being used to pick up a steel
v 25. Which
of the following are possible sets of polarity when
magnetising a steel bar by the stroking method?
bar. The N-pole of the magnet is close to the centre Y of the
steel bar as shown. What are the poles induced in the steel
bar at X, Y andZ?
magnet
a
direction of stroke
x
Y
steel bar
Z
Y
4.
P=N,O=S,X=N,Y=S
P=N,O=S,X=S,Y=N
P=S,O=N,X=S,Y=N
P=S,O=N,X=N,Y=S
A
1 and 2 only
C
1 and 3 only
1.
A
B
C
D
Pole
Y
Pole
induced at
induced at Z
()
at
io
Pole
X
NNN
NSN
SNS
SSS
induced at
2.
2
n
X
W 26. What can
B3 an d 4 0n ly
D2 an d 4 0n ly
()
be deduced from the following diagram showing
a current flowing in a straight wire surrounded by four
U 23. Which of the following are possible
t2
direction of
stroke
direction of stroke
l
/
comPasses?
Ed
uc
results when a steel bar
is being magnetised by the stroking method?
l
-.......)
---).---N
A
S
steel bar
direction of stroke
al
f
C
D
123
direction of stroke
/
land3only
1,2and3
D
v 27.
()
o
o
The magnetic field caused by the four compasses put
close together will always cause the compass needles
to point in a circle.
Compass needles are affected by the material of the
wire.
Compass needles are affected by the circular electric
field in the wire.
Compass needles are affected by the circular magnetic
field produced by the current in the
)
wire. (
Plotting compasses X and Y are placed below and on top of
a current
carryi":J:::'J,::l::'' u"no*,.in
Which of the following is/are possible result(s)when a steel
bar is being magnetised by the double stroking method?
Da
v 24.
B
l and2only
2and3only
ny
A
C
I
3
{
B
current direction
N
S
steel bar
A
C
direction of
X
stroke
direction of stroke
Y
N
S
steel bar
2 only
B
1
and
2and3only
D
1
and
2o nly
3o nly
(
)
the diagram
17O
Therne
5 I tieciricity r:nd b.4*Ene,,isr:
Which of the following shows the possible correct directions
of the compass needles?
A
current
direction
$
curuent direction
X
X
Y
Y
d 30. lron core is placed in a current carrying coil to
A demagnetise the solenoid.
B create a changing magnetic field.
C increase the magnetic strength around the solenoid
D increase the current f lowing in the solenoid.
(
gM 31. Which of the followrng two materials are used for the core
and coil of an electromagnet?
!
current direction
core
iron
iron
lVlaterial for
current direction
A
B
Y
D
M
Y
CI
32.
A iron
B iron
C steel
D steel
current direction
x
Y
Property
U
rr.
*n,rlr
direction
x
B
6l
permanent
demagnetised
magnet
electromagnet
of
easily
magnetised
easily
demagnetised
current direction
6l
!
C
Da
B
D
no core
ffi
tl
copper core
D
lron core
rvooden core
()
U ro. *n,rn
iron
ceramic
of the following is the strongest electromagnet?
A
B
core
core
()
D
C
electromagnet is
steel
copper
B
t
The most suitable material to be used as the core of an
A
()
magnet
current direction
6lo 6lo
drn
permanent
thefollowing producesthe strongestelectromagnet?
C
x
ny
f,
current direction
al
current
)
magnetised
easily
A
Which of the following shows the possible correct directions
of the compass needles?
A
(
Usage
electromagnet
easily
Ed
uc
Plotting compasses X and Y are placed on the right and on
the left 0f a current carrying wire respectively as shown in
the diagram
tr0n
Which of the following is correct?
lvlaterial
()
v 28.
steel
steel
C
X
copper
iron
c0pper
at
io
x
lVaterial for coil
n
f,
()
core
core
()
|
Unit 19
g\\, 35. ln which diagram(s) is/are the correct poles for the
t1:,r,;1
17
1
X along the path shown. The final position of the compass
needle is shown.
t2
N
,1:
gM 40. A plotting compass is moved slowly towards the metal bar
electromagnet indicated?
I
:'t:,, 1. 1,;
N
S
core
s
bar X
N
core
3
What can you conclude about bar X based 0n the diagram
S
above?
steel core
t
A
C
2o nly
2a nd 3
0n ly
B l and2only
D 1,2 and 3
ion
A Bar X is a magnetic material.
B Bar X is a magnet.
C
D
()
\\,
W 36. What
A
B
C
D
field produced throughout
the wire to flow through the core of the solenoid.
To reduce the space taken up by the long wire.
To ensure that the magnetic field strength is constant.
To reduce the amount of wires used to produce the same
magnetic field strength as a straight
)
To concentrate the magnetic
0 41. A plotting compass is moved slowly towards the metal bar
along the path shown. The final position of the compass
needle is shown.
bar
X
@...
electromagnet for a given
flow of current?
C
D
()
wire. (
w 37. Which coil produces the strongest
A
B
a
Bar X is a either a magnet or a magnetic material.
Ed
uc
at
is the main reason for using a solenoid instead of
straight wire to produce magnetic field?
Bar X is a non-magnetic material.
A 10 cm coil with 100 turns
A 5 cm coil with 200 turns
A 10 cm coil with 200 turns
A 20 cm coil with 200
N
What can you conclude about bar X based on the diagram
above?
turns
(
)
A
B
Bar X is a magnetic material.
Bar X is a magnet.
C Bar X is a non-magnetic material.
D Bar X is a either a magnet or a magnetic material.
()
Da
ny
al
U 38. Which of the following
diagrams shows the correct magnetic
field pattern between the poles of two bar magnets?
A
C
--@,-
D
N
+L tk
S
below.
S
D
/itr(
/rr1
(
v 39.
)
Which diagram below indicates the correct magnetic field
pattern between the poles oJ two bar magnets?
A
/i\
SGS
B
-=--Y7C
g\\, 42. A plotting compass is placed beside a bar magnet as shown
-+q-l)\r11-
N
N
S
S
D
()
Which of the drawings shows the correct direction of the
compass needle?
ABCD
c c
()
172
Theme
5 I Electricity ond Mognetism
M
0 43. A compass is placed near a copper bar as shown in the
N 41 .
compass
Ihe diagram below shows the magnetic field of two magnets
placed close together. Three plotting compasses are placed
at the Iocations shown.
diagram. ln which direction will the c0mpass needle point?
N
ti
copper bar
t+)
G
D
C
@ @
A compass is placed between
()
Which is the set of compasses showing the correct directions
of the needles?
two magnets of equal magnetic
123
strength as shown in the diagram. ln which direction willthe
compass needle point?
AO
BO
CO
compass
N
S
A
B
C
O
O
O
DO O
N
S
ion
B
D
v 48.
t
O
O
E
e
at
U 44
A
(
)
The diagram shows the magnetic field of two magnets placed
Ed
uc
close together wrth three plotting compasses placed at the
locations shown.
\V
0 +S n magnet is hanging freely rn the directron as shown.
a
A magnetic field as strong as the Earths magnetic field
is
Which is the set of compasses showing the correct directions
of needles?
introduced from the side as shown.
magnetic field
al
z
/
ny
a
123
Ae
o
BO
o
e
o
O
ce
Do e
o o
(
)
What may be the final position of the magnet?
ABCD
Da
v 46. A
nt\
N 49. The diagram below shows the magnetic field of two current
carrying wires going into the plane of the paper.
()
compass is placed between two magnets as shown in
the diagram. N/agnet X is stronger than magnet Y ln which
direction will the compass needle point?
magnet
N
compass
X
S
A
o
BC
magnet Y
N
S
D
Which set of compasses shows the correct directions of the
needles?
123
Ao
o
BO
O
o
O
cc
o
Do o
o o
(
)
Unit
v 50.
The diagram below shows the magnetic field of two current
carrying wires perpendicular to the plane of the paper.
v 53.
l9 I './....1,
:)1
,,.::,:,:.t1,
173
A steel rod and an iron rod are placed inside a solenoid which
is connected t0 a strong d.c. supply.
steel
iron
rl
side
view
front view
drawing not to scale
Which of the following shows the side view of the rods when
the circuit is switched on for a while before switching it off
needles?
aga in?
AO
BO
co
DO
O
O
o
O
A
O
O
o
uc
at
io
123
n
Which set of compasses shows the correct directions of the
on
!
O
off again
C
g\V 51. Four magnetic materials are used to pick up paper clips
on
B
on
offagain
on
off again
D
off again
after they were taken out from a coil which is connected to
a strong direct current.
The numbers of paper clips picked up by the four magnetic
v 54. Two steel rods are placed inside a solenoid which
lVagnetic material 2
Ed
materials are listed below:
(
lVagnetic material 3
10
)
is
connected to a strong d.c. supply.
Numher of paper clips
picked up
I
IVagnetic material
side view
al
20
v 52.
an
aga in?
(
4
steel
D
N
()n
off again
on
off again
D
on
off again
(
S
Steel bar retains its magnetism and iron bar loses its
magnetism.
lron bar retains its magnetism and steel bar loses its
magnetism.
off again
C
A The steel and iron bars repel each other.
B Both steel and iron bars lose their magnetism.
C
B
on
)
A light steel bar and a light iron bar are attracted to a magnet
as shown. What will possibly happen when the magnet is
removed?
iron
Which of thefollowing showsthe sideviewof the rodswhen
the circuit is switched on for a while before switchinq it off
A
material 1
material 2
material 3
material
Da
C
D
ny
electromagnet?
front view
drawing not to scale
Which is the best magnetic material to be used as
magnetic
magnetic
magnetic
magnetic
-lrl
5
lVagnetic material 4
A
B
steel rods
0
1
(
)
Theme
5 I Electriciiy ond Alognetism
v 59.
EXTENSION QUESTIONS
IV
A
magnet is facing the east-west position?
B
C
The magnetic field in the east-west direction is weaker
than the magnetic field in the north-south direction.
The magnetic field in the east-west direction is stronger
than the magnetic field in the north-south directton.
The weak magnetic f ield of the Earth in the north-south
direction can only align the magnetic domains over
country to country are found to be magnetised. Which of the
following cases has the strongest magnetic strength?
v 57. A
km
km
km
40 km
Earth
Earth
D
(
magnet.
20
20
40
N
C
gM 56. Some steel pipelines which are used to transport petrol from
A
B
C
D
N
a
short distance (width of bar magnet).
There is no magnetic field in the east-west direction to
magnetise the bar
)
Distance
B
Ed
uc
at
io
D
Which of the following shows the correct direction of the
magnet?
0 SS. Why is demagnetisation of bar magnet best done when the
A
A magnet is suspended freely at the north pole of the Earth.
n
174
0rientation
north-south
east-west
north-south
(
east-west
v 60.
)
N
N
Earth
Earth
The diagram below shows the circuit of an electric bell.
What
happens when the bell button is pressed (switched on) and
released (switched off)?
magnet ls inserted into the centre of a coil and an e.m.f.
is induced across the coil. The magnitude of the induced
current depends on
springy
metal
1 the diameter of the coil.
2 the strength of a magnet.
3 the thickness of the wire of which the coil is made.
B 2and3only
A land2only
D 1,2and3 (
C land3only
strip
soft iron
hammer
)
gong
P and 0 attract four soft iron bars, F, G, H and
I at their poles as shown below. What will happen to the
iron bars when the two magnets move towards each other
and attract each other?
ny
PQ
S
S
F
A 1 ting is heard
B 1 ting is heard
C continuous ringing
silence
D
G
F
Switch off
silence
1
ting is heard
silence
continuous ringing
()
N
V
U1. ,n. diagram shows a bar magnet
N
in a magnetic field
S
G
A Nothing will happen.
B G and H will drop off.
C
D
gong 2
Switch on
al
Two magnets
Da
W 58.
()
and H will repel away each other.
and I will attract G and H respectively.
lllllllll
()
What will happen to the bar magnet?
A The bar magnet does not react to the magnetic field.
B The bar magnet moves in the directi0n 0f the field.
C
D
The bar magnet moves in the opposite direction of the
field.
The bar magnet rotates clockwise by
)
90'.
(
Unit
\V
0 62. Which of the following observations
confirms that an object
. : '''.,: t',':.: 175
l9 |
v 66. A
current-carrying wire is coiled around an iron horseshoe
as shown. What are the polarities of X and Y?
is a magnet?
A The object is attracted by a strong bar magnet.
B The object causes a compass needle to move.
The object rotates before being attracted to a bar magnet.
The object is attracted to both poles of a horseshoe
(
magnet.
)
X
U 63. A bar magnet is broken as shown below. What are the
polarities at X and Y?
AtX
A N-pole
B S-pole
x YS
N
,,
C
D
N-pole
S-pole
N-pole
S-pole
N-pole
N-pole
S-pole
S-pole
W 67.
()
/
Figure
I
Figure 2
Bar X
Bar Y
steel bar
steel bar
iron bar
()
A light bar magnet is suspended near a current- carrying wire
as shown below. What will happen to the light bar magnet?
bar magnet
steel bar
bar magnet
()
Two long iron pins are placed at the
ends of a bar magnet as shown.
Da
I
()
the needle points in the direction shown.
al
bar magnet
bar magnet
Alt will rotate clockwise.
Blt wi I rotate anti-clockwise.
Clt willmove to the right.
Dlt will move to the left.
g\\, 68. When a plotting compass is placed near an electromagnet,
ny
A
B
C
D
v 65.
S-pole
Two identical metal bars X and Y are positioned in the two
diagrams shown below. lf there is a strong attraction in Figure
1 and weak attraction in Figure 2, what are the possible
materials for X and Y?
Ed
v 64.
Polaritv at Y
S-pole
S-pole
N-pole
uc
A
B
C
D
Polaritv at X
N-pole
AtY
N-pole
at
io
broken line
Y
n
C
D
N
@
S
long iron pins
Which of the following diagrams, A, B, C or D shows the
Which of the following shows the direction of the needle
situati0n when a shorter magnet is used?
A
C
NS
NS
B
when the polarities of the battery is being reversed?
NS
ABCD
@ @ @ @
D
NS
()
()
176
lheme 5 I Electricity ond Mcgnetisrn
g\\, 69. When a plotting compass is placed near an electromagnet,
W 13.
the needle points in the direction shown.
c
Equal amount of current is flowing in two insulated wires
perpendicular to each other as shown. Which segment, A.
B, C or D has the strongest magnetic field flowing out of the
paper?
A
B
C
n
()
Which of the f0llowing shows the direction of the needle
when the variable resistance is being decreased?
U 74. N/agnetic shield is used to protect
some equipment from
magnetic field. Which of the foll0wing is the best material
for magnetic shield?
Ed
uc
at
io
ABCD
@C@A()
M
0 70. Which of the following is the best way to demagnetise
magnet using the heating method?
A plastic
C iron
D
M
in the air by the attraction
force from a magnet and the gravitational force as shown
in the set-up.
(
tr
A
B
C
D
[+$
+$
+!
+[
Which process below can magnetise a steel bar?
1.
2.
3.
Stroke the steel bar with a magnet.
lnsert the steel bar in a coilwhich is connected to an
alternating current.
lnsertthe steel bar in a coilwhich is connected to a direct
current.
A land2only
C 2and3only
B land3only
D 1,2and3 (
Four different sheets of material are inserted in turn between
the magnet and the paper clip. Which one will cause the
paper clip to drop?
1. steel
3. copper
Da
W 72.
I +l+
3-1-4
2-1-4
1*3-5
al
4.
string taped to the
base of the retort stand
lnsert the magnetised steel bar into a solenoid
Connect direct current to a solenoid.
Connect alternating current t0 a solenoid.
Pull the steel bar slowly out of the solenoid.
Switch off the current supply.
ny
J.
---->:
thin, light string
demagnetrse a steel bar using the electrical method?
2.
sheet of material
paper clip
w 71 Which of the following is the correct sequence to effectively
1.
)
0 75. A paper clip is held stationary
the east-west direction.
Heat the magnet to become red hot and allow it to cool
in the north-south direction.
Heat the magnet to become red hot and allow it to cool
in the east-west
)
direction.
(
a
A Heat the magnet in boiling water and allow it to cool in
the north-south direction.
B Heat the magnet in boiling water and allow it t0 cool in
C
B steel
D copper
)
A 3 only
B 4 only
C l and2only
D 1,2 and 3 only
2.
4.
iron
plastic
(
)