4531/2Fizik Nama : :………………………………………Tingkatan:…… Kertas 2 Mei 20072 ½ Jam

SEKTOR SEKOLAH BERASRAMA PENUH

BAHAGIAN SEKOLAHKEMENTERIAN PELAJARAN MALAYSIA

PEPERIKSAAN PERTENGAHAN TAHUN 2006TINGKATAN 4

FIZIKKERTAS 2

Dua jam tiga puluh minit

JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU.

Untuk Kegunaan Pemeriksa

Bahagian Soalan

Markah

A

1

2

3

4

5

6

7

B 8

C9

10

Jumlah Besar

Kertas ini mengandungi 20 halaman bercetak

1. Kertas soalan ini mengandungi tiga bahagian : Bahagian A, Bahagian B dan Bahagian C

2. Jawab semua soalan.3. Jawapan kepada ketiga-tiga bahagian ini

hendaklah diserahkan bersama-sama.4. Jawapan kepada Bahagian A dan C hendaklah

ditulis dalam ruang yang disediakan dalam kertas soalan.

5. Jawapan kepada Bahagian B hendaklah dijawab dalam kertas tambahan.. Walau bagaimanapun kertas tulis tambahan sekiranya digunakan, perlulah diikat bersama dengan buku soalan ini. Dalam jawapan anda, persamaan, gambar rajah, jadual, graf dan cara lain yang sesuai untuk menjelaskan jawapan anda boleh digunakan.

6. Rajah tidak dilukis mengikut skala kecuali dinyatakan.

7. Markah maksimum yang diperuntukkan ditunjukkan dalam kurungan pada hujung tiap-tiap soalan atau bahagian soalan.8. Penggunaan kalkulator saintifik yang tidak boleh

diprogramkan adalah dibenarkan

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

1 a =

2. v2 = u2 + 2as

3. s = ut + ½ at2

4. Momentum = mv

5. F = ma

6. Kinetic Energy = ½ mv2

7. Potential Energy = mgh

8. Elastic Potential Energy = ½ Fx

9. g = 10 ms-2

10. Power =

2

Section A[ 52 marks ]

Answer all questions in this section.The time suggested to answer this section is 60 minutes

1. Diagram 1 shows a micrometer screw gauge used to measure the diameter of a wire.

Diagram 1

(a) (i) Name the part labelled P.

…………………………………………………………………………………...[1m]

(ii) State the function of P.

…………………………………………………………………………………...[1m]

(b) The diameters of the wire at three different places are shown in table 1.

Diameter, d (mm)1 2 3

3.120 3.20 3.2 Table 1

(i) Which of the reading is written correctly when using micrometer screw gauge?

…………………………………………………………………………………[1m]

(ii) Why is the diameter measured three times?

…………………………………………………………………………………[1m]

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2. A student determine the diameter of a length of wire X by winding 20 turns of the wire round a pencil as shown in Diagram 2.

Diagram 2

The total thickness of wire X was measured by using a plastic ruler which is 1.5 cm.

(a) Calculate the diameter of wire X in unit of mm.

[1m]

(b) State the main advantage of using this method compared to measuring the diameter of only one turn of wire Y by using a ruler.

………………………………………………………………………………………[1m]

(c) Give one example of systematic error and one example of random error that may exist in the above measurement.

………………………………………………………………………………………

………………………………………………………………………………………[2m]

(d) Suggest a more appropriate measuring instrument that you can find in the laboratory for measuring the diameter of wire Y.

………………………………………………………………………………………[1m]

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3. The diagrams below show the signboards which are found at the roadside.

Diagram 3.1 Diagram 3.2

(a) Compare the type of physical quantity shown on the diagrams above.

………………………………………………………………………………………

………………………………………………………………………………………[2m]

(b) State the characteristic of both type of quantities.

………………………………………………………………………………………

………………………………………………………………………………………[2m]

(c) Based on Diagram 3.1, convert the quantity of 90 kmh-1 into SI unit.

[2m]

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4. A car moves with an average speed of 75 kmh-1 from town P to town Q in 2 hours as shown in Diagram 4. By using this information, you may calculate the distance between the two towns.

Diagram 4

(a) (i) Based on the statements given, state two base quantities and their respective SI units. …………………………………………………………………………………...

…………………………………………………………………………………...[2m]

(ii) State a derived quantity and its SI unit.

…………………………………………………………………………………..[1m]

(iii) Calculate the distance between town P and Q.

[2m]

(b) Calculate the volume of a wooden block with dimensions of 7 cm length, 5 cm width and 12 cm height in m3 and express the answer in scientific notation.

[2m]

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5. Diagram 5.1 shows a boy , whose mass is 40 kg is running towards a 2 kg skateboard with a velocity of 20 ms-1. The boy then jumps onto the skateboard and moves forward.

Diagram 5.2 shows a frog with a mass of 100 g which is at rest on a 10 g stationary leaf. The frog then jumps from the leaf to the river bank.

Diagram 5.1

Diagram 5.2

a) Observe Diagram 5.1 and Diagram 5.2 and compare the type of movement of the boy after jumping onto the skateboard and the frog after jumping from the leaf to the river bank.

………………………………………………………………………………………

………………………………………………………………………………………[2m]

b) (i) Compare the total momentum for the boy before and after he jumps onto the skateboard.

………………………………………………………………………………….[1m]

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(ii) Calculate the velocity of the boy after he jumps onto the skateboard.

[2m]

(iii) State the principle involved.

…………………………………………………………………………………[1m]

c) A girl whose mass is 30 kg runs with the velocity of 20 ms-1 to the identical skateboard as shown in Diagram 5.1.

(i) Calculate the momentum of the girl.

[2m]

(ii) Compare the total momentum between the girl and the boy in Diagram 5.1.

…………………………………………………………………………………...[1m]

(iii Give your reason for your answer in (c) (ii).

…………………………………………………………………………………...[1m]

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6. Diagram 6.1 and Diagram 6.2 show a student pulling the elastic string of the arrow in a shooting exercise using different pulling stretch.

Diagram 6.1

Diagram 6.2

(a) Observe Diagram 6.1 and Diagram 6.2.

(i) Compare the stretching force applied to the arrow.

…………………………………………………………………………………..[1m]

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(ii) Based on the answer in 6 (a)(i), compare the work done by the student between the two pulling techniques.

…………………………………………………………………………………..[1m]

(iii) If the applied force is 50 N and the distance of x is 20 cm, calculate the work done by the student.

[2m]

(b) Based on both diagrams,(i) compare the energy gained by the arrow.

…………………………………………………………………………………[1m]

(ii) compare the distance of projection.

…………………………………………………………………………………...[1m]

(iii) state the relationship between energy and distance of projection.

…………………………………………………………………………………..[1m]

(c) Make a suggestion to increase the distance of projection.

………………………………………………………………………………………...[1m]

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7. A car is moving along a straight road. The driver applies the brake when a traffic light turns red. Diagram 8 shows the velocity – time graph for the movement of the car.

30

25

20

15

10

5

Based on the graph,

(a) calculate the deceleration of the car.

[2m]

(b) (i) what happen to the velocity of the car when t increases?

…………………………………………………………………………………..[1m]

(ii) determine the velocity of the car when the brake is applied at first.

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1 2 3 4 5 6 t / s 0

V / ms-1

Graph V against t

Diagram 7

(show your step in the graph given)

…………………………………………………………………………………[2m]

(c) (i) calculate the area under the graph between t = 0 s and t = 5 s.

[2m](ii) name the physical quantity which represents the value in (c)(i).

…………………………………………………………………………………...[1m]

(d) (i) name the physical quantity which remains constant.

…………………………………………………………………………………...[1m]

(ii) determine the time taken for the car to stop.

…………………………………………………………………………………...[1m]

(iii) sketch a graph of deceleration against time.

[2m]

Section B[20 marks ]

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Answer all questions in this section.The time suggested to answer this section is 30 minutes.

Diagram 8

8(a) Diagram 8 shows a parachute attached to a man’s body whose weight is 65 kg when he jumps off from the plane. The ropes used are very light, strong, 3.5 m long and do not occupy a big space. The table 8 below shows a few types of ropes which could be used to make the parachute.

Ropes Length Density Snapping force DiameterJ 3.6 X 102 mm 1.2 gcm-3 450 N 0.30 cmK 3.6 X 10-3 km 1.5 gcm-3 950 N 7.0 X 10-3 mL 3.6 X 102 cm 4.8 gcm-3 650 N 0.50 cmM 3.6 dm 3.5 gcm-3 1050 N 15 mm

(i) What is meant by standard form in writing a numerical value? [1m]

(ii) You are required to state the most appropriate characteristics of the rope to be used for the parachute. Then, determine which rope from the table above perfectly fits the characteristics that you have given. Justify your answer.

[10m](b) (i) What is meant by scalar and vector quantity. (ii) Give one example each for scalar and vector quantity. [3m]

(c) A coconut falls from a height of 20 m with the increasing rate of velocity 10 ms-1 for every second. (i) Calculate the time taken for the coconut to reach the ground. (ii) Sketch a graph to show the movement of the coconut for each of the following;

-Velocity against time - Acceleration against time [6]

Section C[28 marks ]

Answer all questions in this section.

13

Table 8

The time suggested to answer this section is 60 minutes

9 . An experiment is carried out to study the relationship between the rise in temperature

of water and the quantity of heat supplied when the mass of water is kept constant.

The apparatus is set up as shown in Diagram 9.1. A heating coil of 1 kW is used

during the experiment.

Diagram 9.1

At the beginning of the experiment, the initial temperature of the water which is

measured with a thermometer is recorded. The thermometer reading is shown in

Diagram 2. The water is then heated for 5 minutes by using the heating coil and the

temperature is recorded as shown in Diagram 3.The experiment is repeated for a time

of t = 10 minutes, 15 minutes , 20 minutes , 25 minutes .The respective thermometer

readings are shown in Diagram 4, Diagram 5, Diagram 6 and Diagram 7.

14

(a) Based on the aim and procedure of the experiment, identify;

i) the manipulated variable ,

…………………………………………………………………………….

[1 m]

ii) the responding variable ,

………………………………………………………………………...

15

[1 m ]

iii) the fixed variable ,

…………………………………………………………………………

(b) Based on Diagram 2 determine the initial temperature at the beginning of the

experiment,

θ = …………………………

[1 m ]

(c) Based on Diagram 2 to Diagram 7, determine the reading of thermometer.

Tabulate your data of time, t and temperature, θ.

[4 m]

(d) On a sheet of graph paper, plot a graph temperature, θ against time, t.

[7 m ]

(e) State the relationship between temperature, θ and time ,t.

……………………………………………………………………………………

[1 m ]

16

[1 m ]

17

10. A student carried out an experiment to investigate the relationship between mass, m and period of oscillation , T using inertial balance. The student uses different masses of plasticine and record the corresponding period of oscillation, T. He then plotted a graph of T2 against m as shown in Diagram 10.

Diagram 10

18

20 40 600 10 30 50 70 0.2 0.40.6 0.8 1.01.21.4 1.61.8

1.0

m / g 80

Graph T2 against m

m/g

T2 / s2

2.0

3.0

4.0

10 20 30 40 50 60 70

a) Based on the graph shown,

i. state the relationship between T and m.

……………………………………………………………………………………

…………………………………………………………………………………… [ 1 m ]

ii. Calculate the period, T if the mass of the plasticine used is 55 g. Show how you determine the value of T.

[ 3 m ]

iii) Calculate the gradient of the graph of T2 against m. Show on the graph how you determine the gradient.

[ 4 m ]

19

2 4 60 1 3 5 7 F / N 8

(b) The student continue the experiment using a plasticine labelled Q. From the experiment , the period of oscillation obtained is 1.2 seconds. By using the plotted graph, determine the mass of plasticine Q.

[ 3 m ]

( c) State a precaution taken in this experiment . ………………………………………………………………………………………...

………………………………………………………………………………………... [ 1 m ]

END OF QUESTION PAPER

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