Physics Item Berfokus Paper 2 2009

8/8/2019 Physics Item Berfokus Paper 2 2009

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Name: ............................................................................................... Class: .......................

PEJABAT DAERAH KLANG

SPM ITEM BERFOKUS 2009 4531/2

SET 1

PHYSICSPAPER22 hours Two hours and thirty minutes

DO NOT OPEN THIS BOOKLET UNTIL YOU ARE TOLD TO DO SO

1. The questions are written in English.

2. The diagrams in the questions are not drawn toscale unless stated.

3.The marks allocated for each question or partquestion are shown in brackets.

4. If you wish to change your answer, cross out theanswer that you have done. Then write down thenew answer.

5. You may use a non-programmable scientific

calculator.

Examiners Name

Section Question Mark Score

A

1 4

2 5

3 6

4 7

5 8

6 8

7 10

8 12

B

9 20

10 20

C11 20

12 20

Total

This booklet consists of 24 printed pages


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2

The following information may be useful. The symbols have their usual meaning.

1.t

uva

!

2. v2 = u2 + 2as3. s = ut+

2

1at2

4. Momentum = mv5. F= ma6. Kinetic energy =

2

1mv

2

7. Gravitational potential energy = mgh8. Elastic potential energy =

2

1Fx

9. Power, P=Ti

e

nergy

10. V =V

m

11. Pressure, P =A

F

12. Pressure, P = h gV 13. Heat, Q = mcU14. Heat, Q = ml15. !

T

PV constant

16. n =r

i

sin

sin

17. depthapparentdepthreal

!n

18. vuf111

!

19. m =u

v

20. v = fP21. P =

D

ax

22. Q = It23. E= VQ24. V= IR25. E = V+ Ir26. Power, P= IV

27.P

S

P

S

N

N!

28. Efficiency %100v!PP

SS

VIVI

29. E= mc230. g= 10 m s-231. Atmospheric pressure = 1 v 105Pa


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3

Section A

[60 marks]

1. Diagram 1 shows electromagnetic wave propagates through space.

Diagram 1(c)Underline the correct answer in the bracket to complete the sentence below. Electromagnetic

wave is a (longitudinal, transverse) wave.

[ 1mark]

(b) Based on diagram 1,(i) State one distance this is equal to a wavelength of the electromagnetic waves.

Label the distance using the symbol .

[1 mark]

(ii) Name one example of the electromagnetic wave.

.....[1 mark]

(c) What happens to the speed of wave when it propagates through glass?

.....[1 mark]

Answerall questions in this section.


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2 Diagram 2.1 shows the graph of velocity against time from the test drive of a new car carrying four

passengers.

Diagram 2.1

(a) (i) What is meant by acceleration?

.....[1 mark]

(ii) On the graph in Diagram 2.1, mark the point X where the acceleration of the car begins todecrease.

[1 mark]

(b) Calculate the distance traveled by the car from t= 3 s to t= 5 s.

[2 marks]

(c) Sketch in Diagram 2.1, the graph that will be obtained if the car is tested again without anypassengers.

.[1 mark]

Time / s76543210

Velocity / m s1

5

10

15

20

25

30

35


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5

3. Diagram 3.1 shows photograph of an electr ic circuit. The circuit contains four identical bulbs

connected to four identical new dry cells

Diagram 3.1

(a) What is the type of the circuit?

.....[1 mark]

(b) Draw an electric circuit diagram for the above arrangement of apparatus usingappropriate symbols.

[2 marks]


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(c) Compare the brightness of the lamps J , K ,L and M. Tick () one box below.

The brightness of lamp J >lamp K > lamp L > lamp M

The brightness of lamp L >lamp K > lamp J > lamp M

The brightness of lamp J = lamp K = lamp L = lamp M[1 mark]

(d)Give one reason for your answer in (c)......

[1 mark]

(e) Explain why the circuit above is used in the house lighting circuit.

.....[1 mark]


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4. Diagram 3 shows a cats eye fixed into a road to help drivers when it is dark or foggy.

Diagram 3

(a) What is meant by critical angle?Tick () the correct answer in the box provided.

The angle of incidence when the angle of refraction is 90o .

The angle of incidence when the incident ray is totally reflected.[1 mark]

(b) Based on diagram 3 how does the cats eye help the driver?

.....[1 mark]

(c) Explain why the light ray does not bend when it enters prism at point A.

.....[1 mark]

(d) Based on diagram 3, what happen to the light ray after passing point B?

.....[1 mark]

(e) Name the phenomenon shown in Diagram 5.

.....[1 mark]

(f) The critical angle for glass is 38o. Calculate the refractive index of the glass.

[2 marks]


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6. Diagram 6 shows headlamps circuit of a car. A high beam bulb, H are labeled 12V, 36W and a

low beam bulbs, L are labeled 12V , 24W.

Diagram 6

(a) (i) Underline the correct answer in the bracket to complete the sentence below.The bulb in diagram 6 are connected in (series, parallel).

[1 mark]

(ii) What will happen to bulbs H if bulbs L blows?

.....[1 mark]

(b) Both of the bulbs H are in diagram 6 is labelled 12V , 36 W.(i) What is meant by 12V , 36 W?.....

[1 mark](ii) Calculate the current in the circuit when one bulb L is lit.

[ 1mark]


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(iii) Calculate the total resistance of the circuit when all the bulbs are lit.

[ 3 marks]

(c) How can the bulbs be connected to increase the total resistance of the circuit?

.....[1 mark]

7. Diagram 7.1 shows a resistance against temperature graph for a thermistor.

0 10 20 30 8070605040

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

Temperature / o C

Resistance / ;

Diagram 7.1


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(a) (i) State how the resistance of the thermistor varies with temperature ?

.....[1 mark]

(ii) What is the resistance of the thermistor at 30 oC . Show on the graph how you determine thevalue of resistance.

.....[2 marks]

(b) A thermistor and a light dependence resistance (LDR) are used to make a simple switch whichcontrol an air conditioner in a room as shown in Diagram 7.2.

The air-conditioner is only activated either on a sunny day or at a hot night

Keys : Input P : during the day - logic 1Input P: at night - logic 0

Input Q : when hot - logic 1Input Q : when cold - logic 0

Relay switch : switch on when output logic is 1

Relay switch : switch off when output logic is 0

Table 7 shows a truth table operation indicates the logic gates which control the air-conditioner system.

Inputs Output

P Q R

0011

0101

Table 7

LDR

P

Air-conditionerPenyaman

0 V

12V

AC ,240

RelayGeganti

Thermistor

Diagram 7.2


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(i) Using the keys given, complete the table 7

[1 mark](ii) Name the logic gate in the circuit in Diagram 7.

.....[1 mark]

(iii) In the space below, draw a symbol of the logic gate in 7 b (ii) .

[1 mark]

(c) Diagram 7.3 shows a light dependent resistance, LDR , used in transistor circuit to control aroad lamp labeled 240 V. 100 W.

Diagram 7.3

At night the road lamp is switched on automatically.

(i) What is the function of resistor R1 ?

.....[1 mark]

(ii) Explain how the circuit functions at night.

.....

.....[2 marks]

(iii) Why the lamp is not connected directly to the transistor circuit?

.....[1 mark]

lamp240V,100WRelay

R1

6 V

240 V


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8 (a)State Ohms law.

......

[1 mark]

(b) Diagram 8.1 shows a graph of current, I, against potential difference, V, of a diode.

Diagram 8.1

(i) State whether the ohms law is obeyed by the diode......

[1 mark](ii)Give a reason why there is no current flowing through the diode when the potential

difference is between 0 V and -2 V.

.....[1 mark]

(iii)What is the resistance of the diode when the potential difference is 2 V?

[2 marks]

Identical light bulbs, each of resistance R , are connected in three circuits as shown in Diagram 8.2.

V/ V

I/ mA

8

6

4

2

-2 -1 0 1 2 3


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Circuit X Circuit Y Circuit ZDiagram 8.2

The rheostat in each circuit is adjusted and the potential difference, V, against current, I, graphsare plotted for each circuit. The graph for each circuit is shown in Diagram 8.3.

Graph K Graph L Graph M

Diagram 8.3

(i) Match the graphs K, L and M to the circuits X, Y and Z.Circuit / Graph /

X

Y

Z

[3 marks](ii)Explain your answers in (c)(i)......

.....[2 marks]

(iii) Calculate the value of R.

[2 marks]

A

V

A

V

A

V

2I/A

4 6 8

2

4

10

12

0

V/V

2I/A

4 6 8

2

4

1

12

0

V/V

2I/A

4

2

4

8

1

12V/V


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Section B

[ 20 marks ]

Answer any one question from this section.

9. The graph in Diagram 9(a) shows the cooling curve of 10 g of naphthalene. The graph in Diagram9(b) shows the cooling curve of 50 g of naphthalene

(d)What is meant by latent heat? [1 mark](d)Using Diagrams 9 (a) and 9 (b) compare the mass of naphthalene, the time taken for the

naphthalene to solidify and the latent heat released. Relating the mass of naphthalene and theheat released to deduce a relevant physics concept.

[5 marks]

(d)Referring to the graph in Diagram 9(a), explain the changes which occur in the liquidnaphthalene when it is cooled until it changes from the liquid to the solid state.

[4 marks]


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(d)Diagram 10.3 shows a set up used to study the effects of magnetic field of a current -carryingcopper rod.

Diagram 10.3

(i) Explain what happens to the copper rod when the switch is turned on.

[2 marks]

(ii) The dry cells are replaced with 12 V a.c. Explain what happens to copper rod when theswitch is turned on.

[2 marks]


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(e) Diagram 10.4 shows a d.c. electric motor .

Diagram 10.4

(i) Explain how the motor is able to rotate.

[4 marks]

(ii) Suggest three modifications that need to be done on the d.c electric motor to increase theefficiency of the motor. Give an explanation for each suggestion given.

[6 marks]


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(b) Table 11.2 shows four specifications P, Q, R and S for the design of a slide projector.

Table 11.2

You are required to determine the most suitable specifications for the design of a slide projectorbased on Diagram 11.1. Study all the specifications given, based on the following aspects:

- The type of mirror used

- The arrangement of lenses for the condenser lens

- The distance of slide from the projection lens

- The way the slide should be placed

Explain the suitability of the aspects.

[10 marks]


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(c)On a very hot day, vehicle drivers often see images which look like pools of water on a roadsurface. This phenomenon is known as a mirage.

(i) Explain how a mirage is formed.

(ii) Can a mirage be formed in very cold places like the Artic?[4 marks]

(d) Diagram 11.3 shows a man aiming his spear at a fish before throwing it. Unfortunately the speardid not hit the fish.

Diagram 11.3

(i) Explain why the spear did not hit the fish when it was thrown.[3 marks]

(ii)Calculate the real depth of the fish if the image of the fish is 0.4 m from the water surface.(Refractive index of water =1.33)

[2 marks]


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12.Radioactive material has some important uses in the field of agriculture such as to study theeffectiveness of fertilizers and control the population of pests.

(a) A researcher conducted an investigation using posphorus-32 to study the absorption andmovement of fertilizers in the plant. Diagram 12.1 shows how radioisotope posphorus-32 isinjected to the stem of the plant. The half-life of posphorus-32 is 14 days and emits F-particles.

Diagram 12.1

Based on the information on radioactivity and Diagram 12.1 :

(i) What is meant by half life?[1 mark]

(ii)What is F-particles.[1 mark]

(iii) Name the most suitable detector could be used to detect F-particles..

[1 marks]

(b)The initial posphorus-32 activity is 800 counts per second. Calculate the time taken for thephosphorus-32 activity to decrease to 50 counts per second.

[2 marks]


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(c) The population of pests can be controlled using radiation from radioactive source. You are

assigned to study the characteristics of some radioisotopes that are suitable for use incontrolling the population of pests.

Table 12.2 shows the characteristics of four radioisotopes.

RadioisotopeCharacteristics of radioisotope

State ofmatter

Types of ray Half-life

Iodine-131 Liquid Gamma 8 days

Xenon-133 Solid Beta 5 days

Cobalt-60 Solid Gamma 5 years

Strontium-90 liquid Beta 8 years

Table 12.2

Explain the suitability of the characteristics of the radioisotope to be used in thecontrolling the population of pests based on the following aspects:

- State of matter

- Types of ray

- Half-life

Determine the most suitable radioisotope to be used and give the reason for your choice.

[8 marks]


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(c)The following equation shows a fission reaction of Uranium-235.

(i) What is meant by a nuclear fission?[1 mark]

(ii)Nuclear fission produces a chain reaction. Describe how the chain reaction occurs in anuclear fission of an atom of Uranium- 235.

[4 marks]

(iii) The nuclear energy produced in the fission reaction of uranium-235 is 2.9 x 10 -11 J.Calculate the total lost of mass in the reaction. [ c = 3.0 x 108 ms-1]

[2 marks]

END OF QUESTION PAPER

Documents

Physics Item Berfokus Paper 2 2009