Marking Scheme Paper 2 (4531/2) Questio
n
Answer
Mark
1.a Outer jaw/caliper Rahang/angkup luar 1
1.b 0.01 cm 1
1.c 0.39 cm 1
1.d 0.39
5 // 0.078 cm 1
Total 4
Questio n
Answer Mark
2.a a region around a magnetic material/current carrying conductor which experience force 1
2.b.i 1
2.b.ii 1
2.c Right hand grip rule 1
2.d magnetic field lines closer // flux closer/increases 1 Total 1
Questio n
Answer Mark
3.a Voltage when I=0 // Energy supplied to move 1C of charge through open circuit 1
3.b X 1
3.c.i M1 r = - gradient // - 9−3 2−8 M2 r = 1.0 Ω
2
Questio
n Answer
Mar k
4.a Concave mirror 1
4.b The image formed is larger than object 1
4.c.i 3
4.c.ii Virtual / Upright / Magnified 1
4.d increases 1
Total 7
Questio n
Answer Mark
5.a Elastic potential energy 1
5.b.i thickness of the Spring P < Q // 1
5.b.ii same 1
5.b.iii horizontal distance in Diagram 5.1 is shorter 1
5.b.iv spring constant of Spring P is less 1
5.c.i thickness of the spring increases, the spring constant increases 1 5.c.ii the spring constant increases, the horizontal distance increases 1
5.d Decreases 1
Total 8
Questio n
Answer Mark
6.a Diode 1
6.b.i The capacitance of the capacitor in Diagram 6.3 is higher 1 6.b.ii The smoothness of wave pattern in Diagram 6.3 is higher 1 6.b.iii The magnitude of peak voltage, VP same 1 6.b.iv capacitance of the capacitor increases, the smoothness of wave pattern
increases 1
6.c Full-wave rectification 1
1
2Questio
n Answer Mark
7.a.i Bernoulli’s principle 1
7.a.ii 1
7.b M1 2000 x 10
M2 20,000 N 2
7.c.i M1 Aerofoil
M2 produce difference in air pressure // produce lift force 2
7.c.ii M1M2 Low densityLight/smaller mass 2
7.c.iii M1M2 Big surface areaBig lift force 2 Total 10
Questio n
Answer Mark
8.a Longitudinal wave 1
8.b M1 Loudness increaseM2 Amplitude increase 2
8.c M1 Pitch increasesM2 Frequency increases 2
8.d.i Frequency of wave transmitted : high
Reason : high energy 2
8.d.ii Type of reflector : concave
Reason : to focus the wave 2
8.d.iii Type of medium in Column X : waterReason : sound wave travel faster in water 2
8.e T 1
Questio n
Answer Mark
9.a.i Heat energy needed to change the temperature of 1 kg object by 1C 1
9.a.ii
M1 amount of heat supplied is same
M2 specific heat capacity of aluminium dust > M3 final temperature of aluminium dust < M4 change of temperature of aluminium dust <
M5 change of temperature increases, the specific heat capacity decreases
5
9.b
M1 Good heat conductor has a smaller specific heat capacity.
M2 Hence the body of the cooking pot can be heated up very fast/ easy to hot. M3 Poor heat conductor has a larger specific heat capacity.
M4 Hence the handle may absorb a great amount of heat without a high increase in temperature// will not become too hot.
4
9.c
Suggestion Reason
Add more ice Large mass of ice can absorb more heat from the drinks.
Container made of heat insulator / polystyrene
To reduce heat absorbed from the surrounding.
Container made of substance with
high specific heat capacity heated up slower Use white container Do not absorb heat //
Absorb less heat Low density of container lighter
Cover the container // lid Reduce heat absorbed through radiation //To reduce heat absorbed from the surrounding.
*Accept any suitable suggestion. Give one mark for the suggestion and one mark for correct reason.
Questio
n Answer Mark
10.a Helium nucleus 1
10.b.i M1 The mass : alpha > beta > gamma rayM2 The speed : alpha < beta < gamma
M3 The range in air : alpha < beta < gamma 5 10.b.ii M4 The smaller the mass the longer the range in airM5 The higher the speed the higher the penetrating power
10.c
M1 Alpha has large mass // rate of collision high // collides easily with air molecules //
M2 Alpha loses energy due to collisions // energy used is higher
M3 Alpha has positive charge, so it is easily ionized M4 Alpha has large momentum.
4
10.d
Suggestion Explanation / Reason Uranium rod/pellets as
fuel Uranium nucleus can be split by neutron to produce energy Control rod To control the rate of reaction // to absorb neutrons Moderator To reduce the speed of neutrons Water To absorb and remove heat from the
reactor core. Reactor core vessel wall
is made of thick lead and containment wall is made of concrete.
To prevent fission products from escaping due to accidents.
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Question Answer
Mark 11.a
Virtual // Magnified // Upright 1
11.b M1 The convex lens is aimed // focused to a distant object (infinity)
M2 The screen is adjusted until a sharp image is formed on the screen M3 The distance between the screen and the lens is measured
M4 Focal length = distance between the screen and the lens
4
Longer focal length To produce real, inverted and smaller image
High magnification Produce bigger image
Distance = fo + fe Produce image at normal adjustment // image at infinity
Bigger diameter More light can enter objective lens // more brighter
Question Answer Mark
12.a Electrical energy Gravitational P.E. 1
12.b.i
VIt = mgh // Electrical energy = Gravitational P.E. // M1 (6.0)(I)(2 x 60) = 9.0 x 10 x 12.0
M2 1.5 A
2
12.b.ii No energy loss // Total energy is conserved // Electrical energy = Gravitational P.E. // Motor is 100% efficient 1
12.c.i
M1 When current flow in the coil, magnetic field produced M2 interaction between two magnetic field // catapult field M3 Pair of forces produced
3
12.c.ii
M1 Correct pattern /Corak betul
M2 Two area of strong magnetic field / Ada dua kawasan medan kuat M3 Correct direction of force // Arah daya betul
3
12.d
M1 Long pointer M2 Big deflection per unit current // smaller scale division M3 More number of turns M4 Strength of magnetic field big
M5 Thin control spring
M6 More elastic // less stiff /
small spring constant / k // more sensitive
M7 Concave magnet M8 Produced radial magnetic field // uniform rotation // linear scale M because M1,3,5,7 // M2.4,6,8
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