Skema PPT F5 Fizik 2 (SMKRPK 2007)

8/14/2019 Skema PPT F5 Fizik 2 (SMKRPK 2007)

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MID-YEAR ASSESSMENT 2007MARKING SCHEME (FORM 5 PHYSICS PAPER 2)

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SECTION A

(1) (a)(i) Voltmeter (1)(ii) To adjust the current flowing in the circuit (1)

(1)(b)(i) Ammeter Y (1)(ii) Ammeter Y has sensitivity 0.05 A whereas ammeter X has sensitivity 0.1A

(1)

Total : 4 marks

(2)(a)(i) Expansion (1)(ii) It is sensitive to small change in temperature (1)

(b)(i) difference in length of mercury = 22.6 2.6 = 20.0 cm (1)(ii) temperature of hot water = (100/20.0) x 14.3 (1)

= 71.5 OC ( correct unit is MUST) (1)Total : 5 marks

(3)(a) longitudinal wave (1)(b) constructive interference (1)(c) Use formula = ax/D

a = 1.5 m, D = 10.0m, x = 4.0m

= (1.5 x 4.0)/10.0 (1)= 0.6 m (correct unit is MUST) (1)

(d)(i) Decreases (1)(ii) Because when frequency increases, wavelength decreases. From the

formula x = (D)/a, x decreases when wavelength decreases. (1)

Total : 6 marks

1

SMK RAJA PEREMPUAN KELSOM

BUKIT KERAJAAN, 33000 KUALA KANGSAR, PERAK


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(4)(a) Ratchet (1)(b) To exert correct amount of pressure on the object being measured (1)(c) 0.01 mm / 0.001 cm (1)(d) 0.01 mm / 0.001 cm (1)

(e)(i) 1.37 mm / 0.137 cm (1)(ii) Corrected reading = 1.37 (-0.05) (1)

= 1.42 mm (1)

Total : 7 marks

(5)(a) Periscope (1)(b)(i) Second prism is correctly drwan. (1)

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(ii) Total internal reflection will occur (1)

(c)(i) Light ray is correctly drawn to show how it is reflected and finally enter the

eye of the observer ( refer diagram ) (1)(ii) Uprigtht/virtual (1)

(d) Use formula n = 1/sincsin c = 1/nsinc = 1/1.52 (1)

c = 41.14O (2)

Total : 8 marks

(6)(a) Speed : rate of distance travelled / distance travelled in one second (1)

(b)(i) 1 : Before air is blown : pressure at the upper part of paper is higher.

Before lorry moves : pressure at the upper part of the canopy is higher(1)

2 : When air is blown : speed at the upper part of the paper increasesWhen lorry moves : speed at the upper part of the canopy increases

(1)(ii) Air pressure at below the paper is higher than air pressure above the

paper (1)(iii) When speed increases, air pressure decreases (1)

(c) Bernoullis principle (1)

(d)(i) Speed of air at P is higher than speed of air at Q (1)(ii) Water level is correctly marked ( refer diagram below ) (1)

Total : 8 marks

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(7)(a)(i) In diagram 7.2, the distance of hand movement is more than the distance

of hand movement in diagram 7.1 (1)(ii) Work done in diagram 7.2 is greater than work done in diagram 7.1 (1)(iii) Work done, W = EP = mgh = Fx

= 30 x 0.5 (2)= 15 J ( correct unit is MUST ) (2)

(b)(i) Distance of projection increases as energy gained increases (1)(ii) Principle of conservation of energy (1)

(c)(i) Falling time increases (1)(ii) Large mass, acceleration decreases (1)

Total : 10 marks

(8)(a) Kinetic energy = mv2

= x 600 x 152

= 67,500 J (1)

Potential energy = mgh= 600 x 10 x 5= 30,000 J (1)

Total energy at point A = 67,500 + 30,000= 97,500 J (2)

(b) Potential energy at point D = 600 x 10 x 15= 90,000 J (1)

Kinetic energy at point D = 97,500 90,000= 7,500 J (1)

Kinetic energy, EK = mv2

v = (2Ek/m)1/2

v = [(2 x 7500)/600]1/2 (1)v = 5 ms-1 (1)

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(c) Potential energy at point E = 600 x 10 x 3 = 18, 000 J (1)

Total energy of the system = 97, 500 J (1)

Kinetic energy at point E = 97,500 18,000 = 79,500 J (2)

* For (a), (b) and (c) : correct unit is MUSTTotal : 12 marks

SECTION B (Answer any one question)

(9)

(a) Impulse : change of momentum (1)(b) Car will be seroiusly damaged (1)

Driver will be thrown forward (1)Car will be exerted by large impulsive force (1)

(c) The driver in diagram 9(a) tightened the seat belt (1)It hold the body of the driver when the car involved in accident andlengthen the time of impact (1)

(d) Broad safety belt : exert less pressure (2)Lengthen slightly : increases time of impact, decreases impulsive force (2)

(e)- Install air bag (1) : inflated air bag increases time of impact and reduces

impulsive force (1)

- Install safety belt (1) : hold the body of driver due to inertia (1)- Install windscreen (1) : protection for driver and passengers from debris

and rollover (1)- Install side mirrors (1) : driver can see the the surrounding situation (1)- Install front bumper(1) : to absorb impact during collision and reduces

the impulsive force (1)# other suitable and logic answers are also accepted, marks are given to any fivepairs correct anwers.

(10)

(a) Momentum : product of mass and velocity (1)(b) Hand of the karetato and pestle move very fast/high velocity (1)

It makes the time of impact between respective surfaces shorter (1)Both case, large forces are produced (1)Above situations relate to the concept of impulsive force (1)

(c) Action force and reaction force have same magnitude but oppositedirection (1)

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TOTAL (SECTION A) = 60 MARKS


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(d) Moving bullet has momentum to right (1)Momentum to left is produced (1)Momentum to left makes gun to recoil (1)

(e)

Buil it in an aerodynamic shape (1), reduces air resistance and

rise in temperature (1) Smooth surface (1), reduces friction and rise in temprature (1)

Made ofmaterial resistant to high temperature (1), reduce

transmission of heat to the shuttle (1)

Install air-conditioning system (1), reduces rise temperature (1)

Install parachute for landing (1), reduces impulsive force (1)

Install a big air-bag to cushion the landing on land (1), reduces

impulsive force# Other suitable and logic answers are also accepted. Marks are given to any 5

pairs correct answers.

SECTION C(Answer any one question)

(11)(a) Specific latent heat of vapourisation : Amount ofheat energy needed

when 1 kg substance of liquid state changes to gaseous state atconstant temperature. (1)

Under rotating fan, rate of evaporation increases. (1)

Evaporation is endothermic process where heat energy is absorbed(1)

Therefore, bodys temperature drops and fell cool (2)

OR

Water molecules on the surfae layer evaporate(1)

Specific latent heat of vapourasation is absorbed, heat loss (1)

Average kinetic energy of the waters molecules decreases (1)

Temperature of an object depends on average kinetic energy (1)

Therefore, temperature drops and feel cool (1)

(c)(i) Use formula, Q = mlQ = Pt =ml

l = Pt/m = (100x2.6x60)/0.05 (1)= 312,000 Jkg-1 (with correct unit) (1)

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(ii) Use formula, Q = mcQ = Pt

c = Pt/m

= 140 OC (with correct unit) (1)

c = (100x1.2x60)/(0.05x140) (1)= 1028.6 Jkg-1OC-1 (with correct unit) (1)

(d)

Number of fin blade : Must have enough number of fin blade, increases

the rate of heat dissipation (1/1)

Size of fan : Big size fan, produces stronger wind, increases rate of heat

dissipation (1/1) Boiling point : cooling liquid has high boiling point, it will not become hot

quickly (1/1)

Sepcific heat capacity : Cooling liquid has smaller value of specific heat

capacity, conduct heat faster (1/1)

Most suitable car radiator is R (1) because it has enough number of fin

blade, big size fan, high boiling point and moderate value of specific heatcapacity. (1)

(12)

(a) Difference potential or voltage across a conductor is directly proportionalto the current flowing in it (1)

V = IR , where V = volatge, I = electric current and R = resistance (1)

Resistance is defined ratio between potential difference and electriccurrent (1)

R =V/I (1)

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(b)Material T is suitable to be used as heating element because

Small diameter (2)

High melting point, it is not molten easily (2)

High resistance (2)

(c)

Cross-sectional diameterof the wire : Diameter increases,

resistance decreases (2)

Length of the wire : length increases, resistance increases (2)

Type of material used to make the wire : different materials,

different resistance (2)

Temperature : normally, when temperature increases, resistance

increases (2)

(d) Ohms law, V = IR

V = 0.2 x 22.5 (1)

V = 4.5 V (with correct unit) (1)

Section A = 60 marksSection B = 20 marksSection C = 20 marksGrand total marks for this paper = 100 marks

Prepared by : Lau Pee Choong

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TOTAL (SECTION C) = 20 MARKS


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Skema PPT F5 Fizik 2 (SMKRPK 2007)

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