Bahan Pecutan Akhir Fizik SPM

1. MODUL PENINGKATAN PRESTASI TINGKATAN 5
TAHUN 2014
MAJLIS PENGETUA SEKOLAH MALAYSIA (KEDAH)
MODUL 2
FIZIK
Kertas 2
Peraturan Pemarkahan

2. BAHAGIAN A
Soalan
Cadangan Jawapan
Markah
1(a)
(i)
Current
1
(ii)
0.1 A
1
(b)
(i)
Ammeter Y more sensitive
1
(ii)
Smallest scale division for ammeter Y is smaller
1 4
2(a)
Principle of thermal equilibrium
1
(b)
(i)
To ensure the temperature of steam is at 100 oC
1
(ii)
6.5 cm
1
(c)
θ = [(4.5 – 2.5)/6.5] x 100 = 30.8 oC
1+1 5
3(a)
To change the voltage/potential difference
1
(b)
(i)
Transformer P
1
(ii)
Vo > Vi
1
(c)
(i)
Coil B and C // Coil C and D
1
(ii)
Ns/120 = ¼
Ns = 30 turns
1
1 6
4(a)
(i)
Resistance higher than the insulator but lower than a conductor
1
(ii)
Depletion layer
1
(iii)
As a rectifier / To allow current to flow in one direction
1
(b)
(i)
T = 4 x 50 μs = 200 μs
1+1
(ii)
f = 5000 Hz
1
(iii)
Diagram showing one oscillation with 2 squares
1 7
5(a)
(i)
Upthrust on the ball in Diagram 5.1 is higher
1
(ii)
Volume of water displaced by the ball in Diagram 5.1 is higher
1
(iii)
Weight of the water displaced by the ball in Diagram 5.1 is higher
1
(b)
(i)
The bigger the weight of water displaced, the bigger the upthrust
1
(ii)
Archimedes’ Principle
1
(c)
(i)
8.5 N
1
(ii)
V = 8.5/(1000 x 10)
= 8.5 x 10–4 m3
1
1 8
6(a)
(i)
V directly proportional to I
1
(ii)
Resistance
1
(iii)
Gradient in Diagram 6.2 is higher
1
(iv)
Diameter of wire in Diagram 6.2 is smaller
1
(v)
Cross sectional area of the wire in Diagram 6.2 is smaller
1
(b)
The smaller the cross sectional area, the higher the resistance
1
(c)
(i)
Gradient decreases
1
(ii)
Resistance decreases
1 8

3. Soalan
Cadangan Jawapan
Markah
7(a)
(i)
Reflected wave correctly drawn
Incident angle = reflected angle
1
1
(ii)
same
1
(b)
(i)
Reflection // echo
1
(ii)
High
Short wavelength, not easily diffracted
High
High penetrating power
1
1
1
1
(c)
d = (1500 x 5 x 0.5)/2
= 1875 m
1
1 10
8(a)
(i)
Each ray correct for 1 mark
Correct formation of image shown
1+1
1
(ii)
Virtual/Upright/Magnified
1
(iii)
P = 1/0.15
= 6.67 D
1
1
(b)
(i)
fo < u < 2 fo
To produce an real and magnified image
1
1
(ii)
P
Object can be placed nearer to the microscope
1
1
(iii)
Q
Higher power to produce a bigger magnification
1
1 12

4. BAHAGIAN B
Soalan
Cadangan Jawapan
Markah
9(a)
Rate of change of velocity
1
(b)
(i)
Acceleration of toy rocket A is larger
1
1
1
1
1
(ii)
The bigger the acceleration, the bigger the forward force
(iii)
Final velocity of toy rocket A is larger
(iv)
Change in momentum of toy rocket A is larger
(v)
The bigger the final velocity, the bigger the impulse
(c)
Impulsive force is inversely proportional to time of impact
The contestant bends his legs upon landing
Stopping time/time of impact of the constestant increases
Impulsive force acting on his legs decreases
1
1
1
1
(d)
(i)
Larger size of the mattress
So that the athlete could land on the mattress
Using thicker mattress
So that the mattress can be compressed more upon landing
1
1
1
1
(ii)
Higher elasticity of the mattress
To increase the landing time when the mattress is compressed
1
1
(iii)
Using strong bar // low density bar such as aluminium bar
Does not break easily // So that it is light
1
1
(iv)
Wearing tight attire
To reduce air resistance
1
1 20
10(a)
The spontaneous disintegration of an unstable nucleus (atom) by emitting radioactive particles // The process by which an unstable nucleus (atom) loses energy by emitting radioactive particles
1
(b)
The rate of decay is directly proportional to the number of radioactive atoms
When the atoms decay they become stable atoms
When time increases the number of radioactive atoms decreases
This causes the rate of decay to decrease
1
1
1
1
(c)
(i)
The total mass of nuclides before the reactions is more than the total mass after the reactions
1
(ii)
The mass defect of Reaction 1 is more than the mass defect of Reaction 2.
1
(iii)
Nuclear Reaction 1 produces more nuclear energy.
The mass defect of Nuclear Reaction 1 is more // The nuclear energy is proportional to the mass defect.
1
1
(iv)
Einstein’s Equation
1
(d)
(i)
Half-life of few days
Allow time for the radioisotopes to reach the leakage site // Minimise the contamination of the environment
Emit β radiations
The radiations can penetrate the soil but not the pipe
Easily soluble in water
Easy to dissolve the radioisotopes in water
1
1
1
1
1
1
(ii)
Wear protective clothing / shoes
To minimise the technician from the exposure to the radiations
Wear a radiation badge
To monitor the exposure to radiations
Attach the detector to a longer rod
To minimise the technician from the exposure to the radiations
Any two answers
1
1
1
1 20

5. BAHAGIAN C
Soalan Cadangan Jawapan Markah
11(a) (i) Amount of heat required to boil one unit mass of liquid to gas at its boiling point,
without change in temperature
1
(ii) Heat from the heater transfers to the water
Water changes to steam
Steam condenses on food
Steam transfers high latent heat to food
1
1
1
1
(b) (i) E = (0.50)(4200)(100-25)
= 157 500 J
1
1
(ii)
m = 6
3
2.3 10
450 10


= 0.1957 kg
1
1
(iii) No heat loss to the surrounding 1
(c) Low
As heat insulator// prevent heat loss/ heat gain
Low
Absorbs less heat from the food // Lower final temperature
Low
Light
Aluminium foil
Reflects heat back to the food// help transfer escaped heat back to the food//
contains the heat within the cooler bag as long as it remains closed// Metallic
material
S
cooler bag with low thermal conductivity, low specific heat capacity,
low density, aluminium foil as inner lining
1
1
1
1
1
1
1
1
1
1
20
12(a) A region where a magnetic material experiences magnetic force 1
(b) (i) Diagram 2
(ii) Each side of the coil experiences a magnetic force
The forces act in oppostie directionss // A turning force (couple) is exerted on the
coil
1
1
(c) (i) Diagram 2
(ii) Wx = W sin θ
= 0.5 x sin 30o
= 0.25 N
1
1
(iii) F = Wx
= 0.25 N
1
(iv) The smaller the speed of the waves, the shorter the wavelength. 1
(d) (i) Thin control spring
Smaller spring constant // Less stiff
1
1
(ii) More number of turns
Produce stronger magnetic field
1
1
(iii) Concave magnetic pole
To produce radial magnetic field // Produce uniform rotation // Linear scale
1
1
(iv) Longer pointer
Bigger deflection per unit current // Smaller scale divisions
1
1
S is the most suitable model to be chosen
Because consist of thin control spring, more number of turns, using concave
magnetic pole and has longer pointer
1
1
20