5/19/2018 Answer Section B and C and Paper 3
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ANSWER SECTION B AND C
1. (a) (i) The bending of light as it propagates from one medium to another
(ii)
Thickness of slab in Diagram 11.1 is thinner The size if image in Diagram 11.1 is smaller
Position of image in Diagram 11.1 is nearer to bottom
The thinner the glass slab, the nearer the image is to the bottom
The apparent depth increases as real depth increases
(b) The transmitter is placed at the focal point of the dish.
The parabolic dish is focuse to the radio satellite
The radio waves is reflected back to Earth to a receiving dish
The parabolic dish focuses the radio waves onto the receiver which is
placed at the focal point
(c) Aspect Reason
Concave mirror magnified image
Large surface area Increases field of view
Large radius of curvature Bigger image
Longer focal length Bigger image
Less than focal point Bigger image and upright
5/19/2018 Answer Section B and C and Paper 3
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2. (a) (i) Total internal reflection
(ii) Objective lens: to produce a real, inverted and magnified image
Eyepiece: to produce a virtual, upright and magnified image // a
magnifying glass
(iii) can carry large amount of data/information // transmit signals
with very little loss
of energy // very much thinner and lighter // can be bent around
corners
(b) - Object distance: Diagram 9.2 < 9.3
- Image distance: Diagram 9.2 > 9.3
- Image size: Diagram 9.2 > 9.3- The bigger the object distance, the smaller the image distance
- The bigger the image distance, the bigger the size of the image
(c) Aspect Reason
Shorter focal of objective lens High power
Longer focal length of
eyepiece lens
To magnified the image
Object between F and 2F To produce a real, inverted
and magnified image
Bigger than objective lens Image produce always less
than focal
More than fo+ fe Produce image at normal
adjusment
Dry condition Prevent fungus
5/19/2018 Answer Section B and C and Paper 3
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3. (a) Unstable nucleus become more stable nucleus
(b) (i) Negative
(ii) In Diagram A, the EHT is of lower voltage. The deflection is
less.
In Diagram B, the EHT is of higher voltage. The deflection isgreater.
(c) (i) When the voltage is higher, the strength of the electric field is
greater.
(ii) When the strength of the electric field is greater, the deflection
of the radioactive emission is greater.
(d) (i) Nuclear fission
(ii) -
Mass defect during the reaction.- The mass defect is converted to energy.
- The energy produced, E, is given by E = mc2 where m =
mass defect, c = velocity of light in a vacuum.
Aspect Reason
Use tongs/distance controller. so that the distance between
the source and the body is far
Wear a mask the radiation does not
penetrate our eyes
Wear a film badge to detect the amount of
radiation exposed
Wear a radiation proof coat the radiation does not
penetrate the body
Use a lead box/container with
thick concrete
to prevent radiation leakage to
the surroundings
Put a radioactive symbol on
the storage box
to inform users of the
dangerous contents of the box
Keep the exposure time as
short as possible
the body is not exposed to the
radiation for a long time
5/19/2018 Answer Section B and C and Paper 3
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4. (a) Doping is a process of adding a certain amount of specific impurities
to semiconductors to increase their conductivity
(b) - Diagram 2.1, the p end of diode is connected to negative terminal
of dry cell // Diagram 2.2 the p end of diode is connected topositive terminal of dry cell
- Bulb in Diagram 2.1 does not lights up
- No current flow in Diagram 2.1 // Current flow in Diagram 2.2
- The bulb will lights up when the p end of diode is connected to the
positive terminal of dry cell // vice versa
- Current only flow in the circuit when p end of diode is connected
to positive terminal of dry cell or in forward bias
(c) (i)
(ii)
- Capasitors store charge when current flow
- Capasitor discharge when current does not flow
(d) Aspect Reason
LDR is replace by termistor
/ diagram
resistance decrease when
temperature increase
Termistor is place at R1
and R1replace LDR /
diagram
So that V across R1 increase when
the room is hot
Relay switch replace LED
To switch on secondary circuit /to
switch on the fan
Fans are arranged parallel
All fans received 240 V power
supply / other fans still functioning
even though one fan did not function
Resistor connected to the
base of transistorlimit the current to the transistor
5/19/2018 Answer Section B and C and Paper 3
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5. (a) Speed is the distance per unit time
(b) Speed limit is imposed because:
Momentum depends on mass and velocity. The momentum of avehicle is high when it travels in high velocity. A high
momentum will cause a high impulsive force during a collision
Load limit is imposed because:
Inertia depends on mass. The inertia of a vehicle is high when it
carries more load. It is difficult to stop a moving vehicle which is
carrying a big load
(c) Aspect Reason
ABS is more effective than air
brake
lorry can be stopped
immediately without skidding
Two tyres are better than one
tyre
provides better support
5 small tanks are better than 1
big tank
5 small tanks will have smaller
inertia compare with 1 big tank -
reduces the inertial impact on
each tank if the tanker stop
suddenly
Further distance is better to prevent collision between the
trailer and the tractor
S ABS, More tyres, 5 small tanks,
further distance
(d) (i)v =
49 10
3600
v = 13.611 m s1
v = u + at13.611 = 0 + a(12)
a = 1.134 m s2
(ii) F = ma
F = 2 410 1.134
F = 2 733.56 N
5/19/2018 Answer Section B and C and Paper 3
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SECTION C
1. (a) The degree of hotness
(b) -
The thermometer is put under the tongue/inside the mouth- The heat is transferred from the body to the thermometer
- Alcohol liquid expand until it reaches a state of thermal equilibrium
- The temperature of the thermometer is the same as the body
(c) (i)C
LL
LLx
x
o1000100
0
=
Cxo100
525
512
=
Cxo
35=
(ii) (35 + 273)K = 308K
(iii)C
LC oo 100
20
530 30
=
1130 =L cm
(d) Aspect Reason
Freezing point is low/
Freezing point < -65C
- To prevent liquid freeze at -65C/
Not easy to freeze/ The thermometer
can be used to record temperature at -
65C
Boiling point is high/ Boiling
point > 20C
Not easy to boil/The thermometer can
be used to record temperature at 20C
Opaque/Clear red in colour Easy to observe the reading of
thermometerThin glass wall of bulb More sensitive to heat
R is chosen Because it has freezing point < -
65C, high boiling point > 20C,
Clear red in colour and thin glass
wall of bulb
5/19/2018 Answer Section B and C and Paper 3
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2. (a) Power is the rate of work done.
(b) 1. Reading of ammeter increases.
2. Effective resistance decreases.
3.
Reading of the voltmeter decreases.4. The effective resistance between XY decreases.
(c) (i) R = V2 = 6
2
P 18
= 2
(ii) 1 = 1 + 1 + 1
R 2 2 2
R = 0.67
(iii) E = Pt
= 3 X 18 X 2 X60
= 6 480 J
(d) Aspect Reason
Density of wire is small Lighter
High melting point Will not melt at high temperature.
Rate of oxidation low Does not rust easily.
Resistivity is highMore heat energy is produced.
M is choosen.
Because small density, high melting point, rate of oxidation is low
and high resistivity.
5/19/2018 Answer Section B and C and Paper 3
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3. (a) Produce of induc
(b) (i) A curr
changi
(ii)
c
m
T
c
A
v
th
(c) As
Soft iron
Resistance per
low
Ratio of Ns/Np
same as Vs/Vp
The core structu
laminated, henc
of many layers.
Transformer N i
(c) (i) NO A (ii) P= IV
24 = (I
I = 2 A
(iii) Output
80% =
= 30W
e current by cutting of the magnetic flux
nt is induced in the secondary coil when
g magnetic flux due to a changing prim
hen a.c voltage applied to the primary c
rrent flows through the coil, the soft iro
agnetized
is means the magnetic flux linkage in t
il is constantly changing
n alternating emf induced across it to ind
ltage in the secondary coil and a.c curre
rough the secondary coil.
ect Reason
Can be magnetised an
demagnetised easily.
etre must be so that less heat is lost
loss.
ust be the
re must be
must be made
So that resistance of t
increased and eddy cu
reduced.
s most suitable As it has a soft iron co
lowest resistance per
and the
up of a large number
SWER
12
power/ input power X 100%
24/input power X 100%
.
there is a
ry a.c current.
il, an a.c
core is
e secondary
uced a.c
t flows
/less power
e core is
rrents are
re, wire of
etre, has ratio
core is made
f layers.
5/19/2018 Answer Section B and C and Paper 3
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5. (a) Tekanan atmosfera// ketiinggian// ketumpatan
(b) 1. Ubat drpd botol IV digantung supaya lebih tinggi dprd
pesakit
2. Tekanan bendalir dalam botol IV menjadi lebih tinggi dprd
vena pesakit3. Bendalir akan mengalir dari kawasan tekanan tinggi ke
tekanan rendah
4. Ubat akan dapat memasuki vena pesakit kerana tekanan
bendalir ubat yang tinggi
(c)
d. (i) P = F/AP = 50 N/2 cm
P = 25 N cm-2
P = F/A
F = P x A
F = 25 x 15
F = 375 N
(ii) V1= V2A1h1= A2h2
2 x 21 = 15 x h2
h2= 2.8 cm
5/19/2018 Answer Section B and C and Paper 3
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6. (a) Prinsip Archimedes
(b) 1. Total density of ship < density of water2. Buoyant Force = Total weight of ship
(c) - Volume of water displace increases- Produce bigger buoyant force.
(d)
(d) (i) Volume of water displaced = Volume of wooden block
= 3/800
= 3.75 x 10-3
m3
(ii) Weight of load + Weight of wooden block = Weight of water
displacedWeight of load + Weight of wooden block = Vg
Weight of load + (3 x 10) = 1000 x 3.75 x 10-3
x 10
Weight of load = 37.5 30
Weight of load = 7.5 N
Mass = 0.75 kg
5/19/2018 Answer Section B and C and Paper 3
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PAPER 3
SECTION A
(a) (i) State the manipulated variable correctly
Time
(ii) State the responding variable correctly
Temperature
(iii) State the constant variable correctly
Mass of the water// power of the heater
(b) State the value of 0within the acceptable range
0= 25oC
(c) (i) Record the readings of correctly
All five readings of correct
(ii) Tabulate the results for t, and correctly
t / s /oC /
oC
20 32 7
40 39 14
60 46 21
80 53 28
100 60 35
Give a tick () based on the following:
A Columns t, and
B Correct units for t, and
C All 5 values of correct
D All 5 values of correct
[Note : 3 or 4 values of correct : ]
E All values of and
written as whole numbers orconsistent to 0.5oC.
5/19/2018 Answer Section B and C and Paper 3
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Marks awarded :
Number of Marks
6 5
5 4
3 - 4
32 2
1 1
(d) Draw a complete graph of against t
Give a tick () based on the following:
A at the y-axis, t at the x-axis
B Correct units at both axes
C Uniform scale at both axes
D 5 points plotted correctly
[Note : 4 points plotted correctly : ]
E Line of best fit is drawn
F Minimum size of graph 5 x 4 big squares
(Big square: 2 cm x 2 cm)
(From the origin to the last point)
Marks awarded :
Number of Marks
7
55-6 4
3-4 3
2 2
1 1
(e) State the correct relationship between and t
is directly proportional to t
5/19/2018 Answer Section B and C and Paper 3
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2. (a) (i) Decreasing linearly 1
(ii) 7.0
Show on the graph
1
1
(iii) Emf 1
(b) (i) Draw a sufficient large triangle.= 7 3/3 0= 1.33 Ohm/
111
(c) Show on the graph
V = 4.3 V
1
1
(d) E = I (R + r)
7 = 2 (R + 1.33)
R = 2.17 Ohm
1
1
(e) Eye perpendicular to the scale of ruler to avoid parallax error. 1
TOTAL 12 MARKS
5/19/2018 Answer Section B and C and Paper 3
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SECTION B
Answer Marks
(a) (Induced) current is depends on the rate of cutting of
magnetic flux / (speed / height of magnet)
1
(b) (Induced) current increases as the rate of cutting ofmagnetic flux / (speed / height of magnet) increases
1
(c) i. To study the relationship between (induced) current and the
rate of cutting of magnetic flux / (speed / height of magnet)
1
1
1
1
1
1
1
1
ii. MV: Rate of cutting of magnetic flux (height of magnet, h)
RV: (Induced) current,I (deflection of galvanometer)
CV: Number of turns of coil, strength of magnet
iii. Bar magnet, coil of insulated copper wire (solenoid), metre
rule, galvanometer(/ammeter)
iv
v. 1.The magnet is held at height, h= 10 cm, above the
solenoid. The magnet is dropped into the solenoid.
2.The induced current (deflection of galvanometer) is
recorded.
3.
The experiment is repeated with h= 20 cm, 30 cm, 40cm
and 50 cm.
5/19/2018 Answer Section B and C and Paper 3
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vi.
Height of magnet, h(cm) (Induced) Current,I(A)
//Deflection of galvanometer
10
2030
40
50
1
1
1
vii
TOTAL 12
MARKS
Induced current,I (A) // Deflection of
galvanometer
Height of magnet, h
cm
5/19/2018 Answer Section B and C and Paper 3
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3.
(a) Volume of trapped air depends on its temperature 1
(b) The higher the temperature the bigger the volumeof trapped
air
1
(c)(i) To investigate the relationship between volume and
temperature of trapped air
1
(ii) Manipulative : Temperature of trapped air 1
1Responsive : Volume of trapped air (length of air
trapped)
Pressure of trapped air // mass of air 1
(iii) Tripod, beaker, thermometer, Bourdon gauge, Bunsen burner,
rubber tube
1
(iv) Arrangement of the apparatus
1
5/19/2018 Answer Section B and C and Paper 3
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(v) State the procedure including the way to control the
manipulated variables correctly
Water is heated and stirred until the temperature is 20oC. 1
State the procedure including the way to measure the
responding variables correctly
The pressure of trapped air is measure by using the Bourdon
gauge.
Record the reading of pressure in a table.
1
State the repetition of the procedure to obtain a set of data
The above procedure is repeated for a temperatures = 40
oC,60
oC, 80
oC and 100
oC
1
(vi) Temperature/oC Volume of air trapped/ cm
20
40
60
80
100
1
(vii) Draw the axes of y and x with label
1
TOTAL 12 MARKS
Volume ( cm )
Temperature (oC)
5/19/2018 Answer Section B and C and Paper 3
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5/19/2018 Answer Section B and C and Paper 3
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5/19/2018 Answer Section B and C and Paper 3
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6 (a) The position of theKedudukan imej be
(b) The more the depth
will beSemakin bertamba
(c) (i) Aim of experiTo investigateMengkaji hub
(ii) Manipulated vPemboleh uba
Responding vPemboleh uba
Constant variaPemboleh uba
(iii) List of apparat
Tall beaker, wBikar tinggi, a
(iv) Arrangement
(v) Procedure:
1. A beaker iSebuah bik
2. The pointe
image depends on the depth of waterrgantung kepada kedalaman air
of the water is, the more the apparent de
kedalaman air, semakin bertambah dal
ent:the relationship between real depth andngan antara dalam nyata dan dalam ket
ariable: The depth of the water
h dimanipulasikan: Kedalaman air
riable: The position of the imageh bergerak balas: Kedudukan imej
ble: The type of liquid and the type of be h dimalarkan: Jenis cecair dan jenis bik
us and materials:
ater, pins, retort stand and metre ruleir, pin, kaki retort, dan pembaris meter
f the apparatus:
filled with water to a depth of 10 cm.ar diisikan dengan air pada kedalaman
r is moved to obtain the apparent positio
pth of the image
m ketara imej
pparent depthara
akerr
0 cm.
of the pin in the
5/19/2018 Answer Section B and C and Paper 3
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beaker.Penunjuk digerakkan untuk mendapatkan dalam ketara pin dalam
bikar.
3. The apparent position of the pin in the beaker from the surface ofwater, d, is measured.
Dalam ketara pin dalam bikar dari permukaan air, d, diukur.
4. The experiment is repeated 4 times with the depth of water,D: 12
cm, 14 cm, 16 cm and 18 cm.Eksperimen diulangi 4 kali dengan kedalaman air, D: 12 cm, 14 cm,
16 cm, dan 18 cm.
(vi) Tabulate the data:
Depth of water,D/cm
Kedalaman air, D/cm
Apparent depth,d/cm
Dalam ketara, d/cm
10
12
14
16
18
(vii) Analyse the data:Plot a graph of apparent depth, dagainst the depth of the water,DPlot satu graf dalam ketara, d melawan kedalaman air, D
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