skema percubaa09p2

8/9/2019 skema percubaa09p2

1/8

MARKING SCHEME P2

SECTION A

QUESTION 1 Mark Answer Note

(a)( i ) 1 Nuclear Fusion(a)( ii ) 1 High temperature

(b)(i) 1 Positive ( +ve )

(b)( ii ) 1 2TOTAL 4

QUESTION 2 Mark Answer Note(a) 1 Force that oppose acted force forward.(b)

11

F = Acted force - Frictional force= W Cos - Fr = 350 Cos 75 o 90.6 // 350 Sin 15 o - 90.6= 0 N

Gantian betulJwpn dgn unit betul

(c) 11

Stationary.Balanced forces // Forces in equilibrium // Acted forceequal to frictional force.

TOTAL 5


(a) 1 Give the meaning of the monochromatic light correctlyOne colour // One wave length

(b) 1 Give the correct reason why are red fringes formed on the screenConstructive interference // crest meet crest // troughmeet trough // diagram

(c) 1

1

Give the correct substitution

( )

4105.1

105(2

4 x x //

( ( 34 105.1105( x x _________________ 3

3 Answer with the correct unit

6.25 x 10 -7 m(d)(i) 1 State what happen to the distance between two

consecutive dark fringesDecreases

(d)(ii) 1 Give the correct reasonWavelength of red > green // red > green // viceversa

1


2/8

TOTAL 6


4 (a) 1 refraction

(b) 11

Light ray travel from denser to less dense mediumRefract away from normal

(c) 11

13/81.625

(d) (i) 1 Distance from the base of the beaker decrease

(d) (ii) 1 Apparent depth increase

TOTAL 7


(a) 1 Name the working principle correctly,Thermal equilibrium

(b) 1 Give the correct comparison about the mass of thewater.Mass of the water in Diagram 5.2 > 5.1

(c)(i)

(c)(ii)

1

1

Give the correct comparison about the thermometer reading The reading in of thermometer in 5.3 < 5.4

Give the correct comparison about the rate of heat lossThe rate of heat loss from water in Diagram 5.3 >5.4

(d) 1 Give the correct comparison about the quantity of heat in the water in the glassesQuantity of Heat in Diagram 5.4 > 5.3

( e) 1 State the relationship correctlyWhen the mass increases quantity of heat increases

(f) 2 Sketch the correct graph

2


3/8

TOTAL 8


(a) 1 State the meaning of induced current correctly,Current produced when a conductor cut a magneticflux

(b)(i) 1 Give the correct comparison about the number of turns of the wire correctlyEqual// same

(ii) 1 Give the correct comparison about the strength of the magnetic correctlyDiagram 6.2>6.1

(iii) 1 Give the correct comparison about the induced current correctlyDiagram 6.2 > 6.1

(c)(i) 1 State the relationship between the strength of magnetic field and induce current correctlyThe strength of magnetic field increases, the inducedcurrent increases// directly proportional

(ii) 1 Name the physics law involved correctlyFaraday

(d) 1

1

State the explanation correctlyThe induced current flows in a direction to producenorth pole at the solenoidSame pole repel

TOTAL 8

QUESTION 7 Mark Answer Notes(a) 1 The process in which unstable nucleus changes into a

more stale nucleus by emitting radioactive radiation

(b) (i) 1

1

deflects to negative plate and deflects to positive plate deflects more than

(ii) 111

positive charge negative charge

mass bigger than (c)

1

1

Number of alpha particle = 2 //226 + 4x = 234

x = 2number of beta = 2//88 + 2x - y = 90

y = 2

(d) 11

48 g 24 g 12 g 6 g6 g

TOTAL 10

3


4/8


(a) 1 Name the electronic component X correctly,Transistor

(b) 1 Give the correct value of the potential differenceacross the electronic card detector.2V

(c)(i)

(c)(ii)

1

1

Name the electronic component Y correctly, Relay

Give the correct reason why the Y is used As a switch of the secondary circuit / motor circuit

(d)(i) 4

Complete the truth table correctly

One mark for eachrow.

(d)(ii) 1 Give the correct name of the logic gateOR gate

(d)(iii) 1 Draw the correct symbol of the logic gate

(e) 2 Draw the correct circuit - Two switches in parallel- The circuit functioning

TOTAL 12

4

Input P Input Q Output R

Electroniccard detector

Pengesan Kad Elektronik

Inputvoltage atP

Bezakeupayaaninput di P

Coindetector

Pengesan Duit

Syiling

Input voltageat Q

Bezakeupayaaninput di Q

NoTidak

0 NoTidak

0 0

NoTidak

0 YesYa

1 1

YesYa

1 No 0 1

YesYa

1 YesYa

1 1


5/8

SECTION B

QUESTION 9 Mark Answer Note(a) 1 Energy caused by position from ground..

(b)(i)

(ii)

11111

1

The height of the ball at P > at QGravitational potential energy of the ball at P > at QThe velocity of the ball at Q > at PThe Kinetic energy at Q > at P.The Kinetic energy increases as the gravitational

potential energy decreases.

Principle of conservation of energy.

(c) 111

Velocity increasesKinetic energy maximum / increasesBased on the principle of conservation of energy,gravitational potential energy is zero because changedto maximum kinetic energy.

(d) 11

11111111

Semi circular curve shapedExchange between kinetic energy and gravitational

potential energy easily.Increasing / decreasing slope slightlyEasily oscillates caused by changing of energy.Smooth surfaceEasily to moves // Reduce frictional force.Soft layer at the surfaceReduce impulsive force when landing / accident.Strong material // concrete of foundation of the track.Withstand to the high force caused by jumping andlanding.

TOTAL 10 20


(a) 1 State the meaning of cathode ray correctlyCathode ray is a narrow beam of a fast electronsmoving in a vacuum.

(b)(i) 1 State the charge of the cathode ray correctly. Negative/ (-)

(ii)

11

Give the correct comparison about the voltage EHT and the deflection of the cathode ray correctlyVoltage of EHT in diagram 10.2> 10.1The deflection in diagram 10.2>10.1

(c)(i)1

State the relationship correctlyVoltage of EHT increases, the strength of electric fieldincreases // directly proportional

5


6/8

(c)(ii) 1 The strength of electric field increases , the deflectionof the cathode ray increases// directly proportional

(d)

11111

Give the explanation for forming the shadow correctly

The cathode is heated emits electronsThe electron/cathode ray acceleratedCathode rays travel in a straight line.Cathode rays is blocked by maltase crossCathode rays carry kinetic energy and converts tolight energy when they hit the screen.

MAX 4

(e)1,23,45,6

7,8

9,10

11,12

13,14

Component FunctionFilament To heat up the cathodeCathode Emits electronsControl Grid Controls the number of

electrons// control the brightness of the image onthe screen

Focusing anode Focuses the electrons into a beamAccelerating anode To accelerate electrons to

towards the screenY-plates To deflect the electron

beam verticallyX-plates To deflect the electron

beam horizontally MAX 10

TOTAL 20

6


7/8

SECTION C

QUESTION 11 Mark Answer Note(a)(i) 1 State Archimedes principal as

Buoyant force equal to weight of fluid displaced

(ii) 1

111

Volume of air displaced equal to volume of a balloonDensity of air decreased as a altitude increaseWeight of displaced air become smaller At certain height weight of displaced air equal toweight of the balloon

(iii) 11

1

1111111

Large balloonTo produce bigger buoyant / up thrust // Increase thevolume of the air displaced Low density of gas filled in the balloon

Lighter Synthetic nylonLight-weight, strong and air-proof material Low mass of radiosonde instrument

To produce a bigger upward resultan forceR is choosenLarge ballon/low density of gas /synthetic nylon /low mass of radiosonde instrument

( b )( i ) 1

1

Giving a correct equation / Substitute the equationcorrectlymass = density x volumeCorrect answer with unit m=0.216kg

(b)(i) 1

1

1

show the volume of displaced airV= 1.2m 3

Calculate mass of displaced air correctlym= 1.56kgCalculate weight of displaced air correctly andstate that bouyant force equal to weight of displaced air= 15.6N

TOTAL 20

QUESTION 12 Mark Answer Notes

7


8/8

(a) 1 Electric field is a region around a charged object whichany other charged body experience a force

(b) 1

111

Charges on the disc neutralize the negative charges onthe ping pong ballLikes charges on the disc and the ball repelled eachother The ball attracted by the positively charged discThe ball oscillates between the two plates

(c)1,23,4

5,6

7,8

9,10

aspects explanationFuse for each circuit Cut off current if overloadedBulbs and power socketsarrange in parallel

Other bulb or power socketstill working when one of it

blows outCircuit for lighting is in

parallel with power circuitSupply different value of current

Kilowatt-hour meter installed near main fuse

Record total power usageand prevent overloading of current

Circuit L (state all correct aspects)

Acceptany logicanswer.

(d)(i) 111

11

10 13 AV = IR

= 9 x 26.7= 240.3 V

P = IV= 9 x 240.3= 2162.7 W

GantianJawapandan unit

GantianJawapandan unit

Total 20

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