Jawapan kertas 1Modul Set 6 Fokus 3

Soalan Jawapan Soalan Jawapan Soalan Jawapan Soalan Jawapan Soalan

Jawapan

1 A 11 D 21 D 31 C 41 C2 D 12 B 22 B 32 E 42 A3 D 13 B 23 A 33 C 43 A4 C 14 B 24 D 34 A 44 A5 B 15 C 25 D 35 C 45 C6 B 16 D 26 B 36 A 46 A7 B 17 A 27 A 37 D 47 D8 C 18 D 28 D 38 C 48 B9 A 19 C 29 C 39 D 49 D10 B 20 D 30 D 40 C 50 D

Skema FIZIK kertas2MODUL SET 6 FOKUS 3

NO ANSWER MARK1(a)(i) State the name of liquid correctly

- mercury1

(a)(ii) State the correct physical change- Expansion / increase in volume

1

(b)(i) State the choice of instrument correctly-thermometer X

1

(b)(ii) Give one correct reason.- The smallest division is smaller // able to detect the smaller /smallest change

1

TOTAL 42(a)(i) Total internal reflection

Pantulan dalam penuh 1

(a)(ii) The refractive index of Y is higher than the refractive index of X// Vice versaKetumpatan optik Y lebih besar daripada ketumpatan optik X

1

(b)

Sin c =

1n =

12. 1 = 0.4762

c = 28.44o // 280 26’

1

1

(c) Prism periscope // prism binoculars // camera// endoscope and etc.Periskop berprisma/binokular berprisma/kamera/endoskop dll

1

TOTAL 53(a)(i) Constant/ uniform velocity // acceleration is zero

Halaju seragam / pecutan sifar1

1

(a)(ii) Constant acceleration // increasing velocity uniformly followed by zero acceleration // constant velocityPecutan seragam / halaju bertambah seragam diikuti dengan pecutan sifar / halaju seragam

1

(b)(i) zero //F = 0sifar // F = 0

1

(b)(ii) constant / uniform velocity // acceleration is zerohalaju seragam / pecutan sifar

1

(c) 1- a curve with the increasing gradient (from 2.00 pm – 2.01 pm)2- Straight line (> 2.01pm) 2

TOTAL 6NO ANSWER MARK

4 (a) Reflection of wave 1

(b) 1- The incident ultrasonic waves has high frequency/short wavelength

2- can easily be reflected and not diffracted.

1

1(c)(i)

d =

vt2 =

1560×1. 52

= 1170 m

1

1

(c)(ii) 1- Distance between two pulses is 3 cm2- Amplitude is smaller

11

TOTAL 75(a)(i) The wall of a dam in Figure 5.2 is much thicker at the bottom 1(a)(ii) Pressure at B is higher than at A // vice versa 1(b)(i) Dam in Diagram 5.2 1

(b)(ii) 1- When depth increases, pressure increases.2- Thicker at the base can withstand high pressure.

11

(c)(i) Siphon system 1(c)(ii) Diffrence in water level will cause different in pressure//the water level in

the cylinder is lower.1

2

(c)(iii) 1

TOTAL 8

NO ANSWER MARK6(a) Induced current 1

(b)(i) 1- Number of turns in Diagram 6.1 is greater.2- Angle of deflection for galvanometer in diagram 6.1 is bigger.

11

(ii) 1- as the number of turns increases, the rate of change of magnetic flux increases 2- hence, induced more current

1

1(c) Faraday’s law(d) 1- The current induced produces north pole on the left side// Lenz’s Law

2- so as to oppose the oncoming magnet//the direction of the induced current opposes the changes that producing it.

TOTAL 87(a) n-p-n transistor 1

(b)(i) 12 V 1(b)(ii) 27 + 3 = 30 k 1

(b)(iii)

V YZ =

33+27 x 12

= 1.2 V

1

1

(c) 1- Lamp L will light up2- because the voltage across YZ is greater than the base-emitter potential difference of 1.2V

1

1(d) The places Resistor R1 and R2 are swapped 1(e) 1-Resistor R1 is replaced by a thermistor.

2- Lamp L is replaced by an electric bell/alarm/siren11

TOTAL 108(a) Atoms of elements which have same proton number, but different nucleon number/no

of neutrons.Isotop ialah atom satu unsure yang mempunyai nombor proton yang sama, tetapi nombor nucleon yang berlainan

1

(b)(i) 1- Show the line in the graph2- T1/2 = 4 days

11

3

(b)(ii)

Shape of graphOne point is correctTwo or more point

112

(c)(i) Geiger- Muller tube 1(ii) Back ground reading 1

(iii) 562 – 20/19/21 = 542/ 543/ 541 counts/min 1(iv) 5 cm 1(v) 1- At a distance < 5 cm, the reading form detector is larger

2- At a distance > 5 cm the reading of the detector decrease rapidly11

TOTAL 12

Number Answer Mark Remark9 (a) Heat is the quantity of energy that is transformed from one hot object

to a cold object.1

(b) 1-Figure 9.1 shows a situation where a solid changes into liquid / 2- Figure 9.2 shows a situation where a liquid change into gas 3-Both processes require heat. 4-The heat absorbed is not to raise the temperature but to overcome the force between the molecule/ particles. 5-Concept involved is Latent Heat

1

1111

(c)(i)

(ii)

1-Water evaporates from the skin when we sweat. 2-for water to evaporate it use heat from the body

1-Steam has more heat than boiling water 2-due to latent heat of vaporization

11

11

4

(d)Suggestion Explanation

Use insulator behind the absorber panel

To prevent the loss of heat energy//heat from entering home

Use an absorber panel which is painted black.

A black surface is a good absorber of radiation so it willabsorb heat faster

The pipe inside the plate must be made of metal/copper

Metal is a good heat conductor,so it will transmit heat towater easily

Increase the number of coil of pipe embedded in plate

Increase in surface area helps heat to be absorbed faster

Increase the number of coil pipe in the water tank.

More heat is released in the water tank

Lower specific heat capacity of liquid in the pipe

Liquid heat up and transfer heat to water tank faster.

High boiling point liquid in pipe

Liquid does not vaporize easily

Use glass cover on the top of the panel

To trap heat energy.(energy is radiated in, but cannot radiate out again).

Any five suggestions and explanation[ 10 marks ]

2

2

2

2

2

Total 20Number Answer Mark Remark

10 (a) State the energy transformations correctlyChemical energy electrical energy

1

(b) Compare the arrangement of dry cells correctly1 Figure 10.1(a): The dry cells connected in parallel, Figure 10.1(b): The dry cells connected in series

Compare the voltage supplied correctly2 The voltage supplied in Figure 10.1(a) is smaller

Compare the ammeter reading correctly3 The ammeter reading in Figure 10.2(a) is smaller

State correctly the relationship between the voltage supplied and the energy transferred

4 The greater the voltage supplied, the greater the energy transferred to flow the electric charges around the circuit// directly proportional

State correctly the relationship between the current flowing and the energy transferred

5 The greater the current flowing around the circuit, the faster that the energy is transferred

1

1

1

1

1

5

(c) State the situation when touching the live wire correctly1 Our bodies are at earth potential (0V)2 If we touch the live wire, there will be a large potential difference (p.d) the live wire and our body. A large current flow through it, probably fatal.

State the situation when touching the neutral wire correctly3 The neutral wire stays at earth potential (0V), roughly at the same potential as our body. 4 If we touch the neutral wire, there is no p.d. across us and so no current flows.

2

2

(d) Suggestion explanationThe electric appliances are connected in parallel // diagram

If one broke down the others can still function

Fit a switch in series with the appliance

Allow each electric appliances to be switched on and off independently

Fit fuse at the live wire in the fuse box //diagram// Use miniature circuit breakers (mcb’s)

To stop the flow of current by melting when a high voltage of electric current flows through the circuit // switches itself off very quickly if the current exceeds e.g. 15A (for 15A mcb)

Earth connection to the metal case of electrical appliances

Earth wire connected to earth, so that when a fault occurs and a current flows through the live wire and the earth wire, the fuse in the live wire will blow and cut off the supply. It will protect a person who may touch a faulty or live appliance

Use low power lamps / install fluorescent lamp

save the energy and lower cost

Regularly cleaning and removing dust from the air filters of air conditioners

save the energy and lower cost

1

1

1

1

1

1

111

1Total 20

6

11 (a) When an object is immersed in a fluid, the buoyant force on the object is equal to the weight of fluid displaced by the object.

1

(b) - Both A and B float because their densities are less then water//weight of rod A and B equals the weight of water displaced.

- B is denser than A.- Weight of B is greater than weight of A- Weight of water displaced by B is greater.

1

1

1

1 (c) Characteristic preference Explanation

Material made from glass Glass does not corrode with acid

Small diameter of capillary tube To increase the sensitivity of the hydrometer

High density of shots Makes the hydrometer stays upright

Big diameter of bottom bulb To obtain a bigger up thrust.Choose NReason : N is made from glass, has small diameter of capillary tube, high density of shots and a big diameter of bottom bulb.

1

1

1

1

1

1

(d)(i) Weight of boat = weight of water displaced2500 N = 1000 x V x 10V = 0.25 m3

1

1 (d)(ii) Maximum weight = maximum water displaced

= 1000 x 4 x 10 = 40000 N

maximum mass = 4000 kgmaximum load = 4000 – 250 = 3750 kg.

11

1

Total 20

12 (a)(i) A transformer is a device that steps up or steps down the voltage of an alternating current.

1

(ii) Transformer Q Ns>Np

11

(b)(i) Vs = Ns Vp = 500 x 240 Np 2000

= 60V

1

1

7

Vs = 1000 x 110 500 = 220 V

1

1 (c) • Heating effect in the coils

• Eddy currents in the coils • Leakage of magnetic flux • The magnetisation and demagnetisation of the core Maximum 3

111

Characteristic ExplanationLow resistivity To reduce heat loss in the cables Low density The cables will be lighter Low cost Cost of project will be lower Low rate of thermal expansion

The cables will not expand under hot weather

Choose: Cable QReasons: Low resistivity, low density, medium cost, low rate of thermal expansion

222

211

Total 20

8

SKEMA PERMARKAHAN KERTAS 3

No. 1 Answer Mark(a) (i) Manipulated variable = length of wire, l 1(a)(ii) Responding variable = Resistance of wire, R 1(a)(iii) Constant variable = Material of wire, cross-sectional area and temperature 1(b) Tabulate ,l, V, I and R correctly in the table.

A Shows a table which have l, V, I and R B State the correct unit of l /cm, V/V, I /A and R /Ω C All values of V are correct D Values of I are correctE Values of R are correctF All values of are consistent

l /cm V / V I / A R / Ω

20.0 0.5 0.2 2.530.0 0.7 0.2 3.540.0 0.9 0.2 4.550.0 1.1 0.2 5.560.0 1.3 0.2 6.5

111111

(c) Draw the graph of R against l. A - Label y-axis and x-axis correctly B - States the unit at the axis correctlyC - Both axes with the even and uniform scale: D -5 points correctly plotted: E - a smooth best straight line F - minimum size of the graph is 5 x 4 Squares of 2 x 2 cm:

Number of √ Score6 55 4

3-4 32 21 1

5

(d) State the correct relationship based on the candidate’s graph R is directly propotional to l.

1

(e) State ONE correct precaution so as to produce an accurate result of the experimentThe position of the eye perpendicular to the scale when taking the reading to avoid errors due to parallax/systematic error

1

TOTAL 16

9

2 (a) Shows extrapolation on the graph , intercept y-axis

7 N

1

1(b) (i) (ii)

Frictional force

.a increased

1

1(c) (i)

(ii)

(iii)

Shows on the graph appropriate right triangle ( > 5 x 4)

Gradient , m = 35 – 10 9 – 1

= 3.125 N m-1s2

Marked on the graph

a = 2.2 ms-2

F increases linearly with a

1

1

1

1

1

1

(d) Mass 1

(e) 1. Make sure elastic strings are stretched at constant length. 2. The position of the eye perpendicular to the scale of the metre rule when measuring the ticker tape to avoid errors due to parallax/systematic error

1

TOTAL 12

10

3 (a) The depth of the boat in water is affected by the weight/mass of the load Kedalaman bahagian bot di dalam air dipengaruhi oleh berat/jisim beban

1

(b) When the weight (of load) increases, the volume of liquid/water displaced increases.orWhen the number of slotted masses increases, the volume of liquid/ water displaced increases Apabila berat muatan bertambah, isipadu cecair/air yang tersesar bertambah.atauApabila bilangan pemberat berslot bertambah, isipadu ceacir/air yang tersesar bertambah.

1

(c)(i) To study the relationship between weight/number of slotted masses and the volume of liquid/water displaced.Untuk mengkaji perhubungan antara berat/bilangan pemberat berslot dan isipadu cecair/air yang tersesar.

1

(ii)

(iii)

(iv)

Manipulated variable : weight, W / number of slotted massespembolehubah manipulasi : berat, W / bilangan pemberat berslot

Responding variable: volume of liquid/water displaced, VPembolehubah bergerak balas isipadu cecair/air yang tersesar, V

Fixed variable: density of liquid, Pembolehubah dimalarkan ketumpatan cecair,

List of apparatus/material:slotted masses, wooden block, water, beaker, measuring cylinder/rulerpemberat berslot, bongkah kayu, bikar, silinder penyukat/ pembaris

Arrangement of apparatusSusunan radas

1

1

1

11

Volume of liquid/water displaced, V

(v)

(vi)

(vii)

- Set-up the apparatus as shown- A slotted mass of 20g is placed on a wooden block- The volume of liquid/water displaced is measured and recorded.- Experiment is repeated by placing 2, 3, 4 and 5 slotted masses on the

wooden block and the corresponding volume is recorded.

111

1

1

TOTAL 12

Weight, W / number of slotted masses

Weight, W /mass,m/ number of slotted masses

Volume of liquid//water displaced, V

12

4 (a) Inference : The Crane (b) had attracted more load of scrapped irons than the crane because of its larger no. of coils/turns of the solenoid // the strength of the magnetic field depends on the no. of turns/coils of the solenoid.

1

(b) Hypothesis : Bigger number of turns in the solenoid , the stronger will be its electromagnetic field strength 1

(c) Aim : To investigate the relationship between the number of turns and the electromagnetic field strength 1Variables : Manipulated : number of turns in the solenoid Responding :electromagnetic field strength / no. of pins attracted

1

Constant Variable : Current ; soft iron core . 1List of apparatus : Solenoid, PVC tube / large iron nail , iron nails/ pins/paper clips,

ammeter , rheostat and power supply.1

Arrangement of apparatus:

1

Control of Manipulated Variable : Wind the insulated wire around the large iron nail/PVC tube , starting with 50 coils . 1

Measurement of Responding Vble : Lower the solenoild until it touches the iron nails . Record the number of iron nails attracted by it. 1Repeat the experiment & procedure 4 more times with no. of coils at 100 , 150 , 200 and 250. 1Tabulation of data

No. of turns No of nails attracted50100150200250

1

Analysis of data. Sketch the graph of no. of coils against no. of nails attracted 1

TOTAL 12

13