Section A[20 marks]

Answer all questions in this section.Jawab semua soalan

The time suggested to answer this section is 60 minutesMasa yang dicadangkan untuk bahagian ini ialah 60 minit

1 Diagram 1 shows an experiment to study the effect of impurities on the freezing point of distilled water.(Rajah 1 menunjukkan eksperimen untuk mengkaji kesan bendasing ke atas takat beku air suling)

(a) (i) Based on the above experiment , what is your observation of the thermometerreading ? (Berdasarkan eksperimen di atas, apakah pemerhatian anda pada bacaan termometer?)

..................................................................................................................................................[1 mark]

(ii) What is the thermometer reading in Diagram 1.2 ?(Apakah bacaan termometer pada Rajah 1.2?)

.....................................................................................0 C

[1 mark](b) State the variables in this experiment.

(i) Manipulated variable (Pemboleh ubah yang dimanipulasikan)

..................................................................................................................................................[1 mark]

(ii) Responding variable (Pemboleh ubah yang bergerakbalas)

..................................................................................................................................................[1 mark]

(c) State one inference for this experiment. (Nyatakan satu inferens dalam eksperimen ini)

...........................................................................................................................................................[1 mark]

2 Diagram 3 shows the arrangement of the apparatus to compare the hardness of copper and brass.The diameter of the dent in each block is measured when the weight is released and the results are recorded.

DIAGRAM 1.1

(RAJAH 1.1)

DIAGRAM 1.2

(RAJAH 1.2)

Distilled water(Air suling)

Ice(Air batu)

Distilled water(Air suling)+ common salt (garam biasa)

Thermometer(Termometer)

Rajah 3 menunjukkan susunan radas bagi membandingkan sifat kekerasan kuprum dan loyang. Diameter lekukan yang terbentuk pada setiap bongkah diukur apabila pemberat dijatuhkan dan dicatatkan.

Diagram 3

The result is recorded on Table 2

BlockBongkah

Diameter lekuk / cmThe diameter of the dent/cm

The average of the dent/cmPurata diameter lekuk / cmExperiment 1

Eksperimen 1Experiment 2Eksperimen 2

CopperKuprum

1.2 1.41.3

BrassLoyang

0.8 0.9...........................................

Table 2

(a) Based on the experiment above, complete table 2Berdasarkan eksperimen di atas, lengkapkan Jadual 2. [1 mark]

(b) Based on Table 2, state the observation in this experiment. Berdasarkan Jadual 2, nyatakan pemerhatian bagi eksperimen ini.

...........................................................................................................................................................[1 mark]

(c) What is the inference based on the observation above ? Apakah inferens berdasar pemerhatian di atas?

...........................................................................................................................................................[1 mark]

(d) State the operational definition of brass.Nyatakan definisi secara operasi bagi loyang.

...........................................................................................................................................................[1 mark]

(e) Predict the diameter of the dent of copper block if weight 200 g is used in this experiment.Ramalkan diameter lekuk logam kuprum jika pemberat 200 g digunakan dalam eksperimen ini.

...........................................................................................................................................................[1 mark]

Steel ballBebola keluli Block

Bongkah

Weight 100g Pemberat 100 g

Retort standKaki retot

RulerPembaris meter

Section C[20 marks]

Answer Question 10 and either Question 11 or Question 12.Jawab Soalan 10 dan mana-mana satu daripada Soalan 11 atau Soalan 12.

10 Study the following statement.

You are given an iron nail, a steel nail and sodium chloride solutionAnda diberikan sebatng paku besi, sebatang paku keluli dan larutan natrium klorida

(a) Suggest a hypothesis to investigate the above statementCadangkan satu hipotesis untuk menyiasat pernyataan diatas. [1 mark]

(b) Describe an experiment to test your hypothesis in 10(a) based on the following criteriaHuraikan satu ekperimen untuk menguji hipotesis anda di 10(a) berpandukan criteria berikut

(i) Aim of the experiment

Tujuan eksperimen [1 mark]

(ii) Identification of variables Mengenalpasti pembolehubah [2 marks]

(iii) List of apparatus and materials Senarai peralatan dan bahan [1 mark]

(iv) Procedure or method Procedur [4 marks]

(v) Tabulation of data Penjadualan data [1 mark]

10. Study the following statement. Kaji pernyataan berikut. An alloy is harder than its pure metals. Aloi lebih keras daripada logam tulennya. (a). Suggest one hypothesis to investigate the above statement. Cadangkan satu hipotesis untuk menyiasat pernvataan di atas. (b) Brass in an alloy containing copper. Using a copper block, brass block, steel ball and other apparatus, describe an experiment to test your hypothesis in 10(a) based on the following criteria: Loyang ialah aloi yang mengandungi kuprum. Dengan menggunakan blok kuprum, blok loyang, bola keluli dan radas lain, huraikan satu eksperimen untuk menguji hipotesis ada di 10(a) berdasarkan kriteria berikut:

Aim of the experiment Tujuan eksperimen [1 mark]

Identification of variables Pengenalpastian pembolehubah [2 marks ]

List of apparatusSenarai radas dan bahan [1 mark ]

An alloy and pure metal have a different corrosive resistance characteristicAloi dan logam tulen mempunyai sifat tahan kakisan yang berbeza

Procedure Prosedur atau kaedah [4 marks]

Tabulation of data Prosedur atau kaedah [1 mark ]

11 (a) (i) Draw and label the arrangement of particles in copper and bronze.(Lukiskan dan label susunan zarah-zarah dalam kuprum dan gangsa)

(ii) Explain why bronze is harder than copper?(Terangkan mengapa gangsa lebih keras berbanding logam kuprum?)

[4 marks](b) Diagram 11 shows examples of alloys

(Rajah 11 menunjukkan contoh-contoh aloi.)

DIAGRAM 11

Study the above examples. Explain how you would develop a concept of alloy. Your explanation of concept should include the following:(Kaji contoh-contoh di atas. Terangkan bagaimana anda dapat membina konsep aloi. Penerangan anda tentang konsep seharusnya mengandungi perkara – perkara berikut ;)

Identify two common characteristics(Mengenalpasti dua ciri – ciri sepunya)

Develop initial concept.(Membina konsep awal)

Give other examples and non-examples in relation to the concept(Berikan contoh lain dan bukan contoh berhubung dengan konsep tersebut)

Explain the actual concept(Terangkan konsep sebenarnya.)

[6 marks]

11 There are two types of variation, continuous variation and discontinuous variation.(Terdapat dua jenis variasi, variasi selanjar dan variasi tak selanjar )

(a) Give four differences between continuous variation and discontinuous variation.(Berikan empat perbezaan antara variasi selanjar dan variasi tak selanjar [4 marks]

(b) Diagram 11 shows various characteristics of human being.(Rajah 11 menunjukkan ciri-ciri berbeza yang terdapat pada manusia)

Presence of dimples(Kehadiran lesung pipit)

Type of earlobe(Jenis cuping telinga)

Blood group(Kumpulan darah)

Ability to roll tongue(Kebolehan menggulung lidah)

Variation

(Variasi)

DIAGRAM 11

Brass(Loyang)

Bronze(Gangsa)

Pewter(Piuter)

Alloys(Aloi)

Study the above characteristics. Explain how you would develop a concept based on the information in Diagram 11(Kaji ciri-ciri di atas. Terangkan bagaimana anda membina satu konsep berdasarkan maklumat)

Your explanation of the concept should include the following:(Penerangan anda tentang konsep itu hendaklah berdasarkan kepada perkara berikut: )

Identify two common characteristics ( Kenalpasti dua ciri sepunya)

[2 marks] Develop initial concept

(Bina konsep awal ) [ 1 mark]

Give another example and a non-example in relation to the concept(Berikan satu contoh lain dan satu bukan contoh berkaitan dengan konsep tersebut) [2 marks]

State the actual concept (Nyatakan konsep sebenar) [ 1 mark]

12 (a) Name two diseases that can be spread by a vector such as mosquitoes . State symptoms for each diseases.. Namakan dua jenis penyakit yang boleh disebarkan oleh vector seperti nyamuk.. Nyatakan simptom-simptom bagi setiap penyakit . [ 4 marks]

(a) After flood, the residents of Taman Intan is affected by a disease which have the following symptoms Diarrhoea ,Vomiting, muscle cramps and Fever

Selepas banjir, penduduk – penduduk di Taman Intan telah dijangkiti oleh sejenis penyakit yang mempunyai gejala-gejala seperti :

Cirit-birit berterusan.,Muntah-muntah, kekejangan otot dan demam.

Based on the symptoms above, explain the way of how to make a decision to control the disease from spreading out. Your explanation should include the following :Berdasarkan kepada gejala-gejala di atas, terangkan bagaimana cara untuk membuat keputusan bagi mengawal penyakit di atas dari terus merebak.Penerangan anda mestilah berdasarkan kepada perkara-perkara berikut;

Identify the problem Mengenal pasti masalah

Clarification of the problem Penjelasan masalah

Suggest two methods to solve the problem Cadangkan dua kaedah untuk menyelesaikan masalah ini

Choose the best method and state the reason for your choice Pilih kaedah terbaik dan nyatakan sebab pilihan anda

[ 6 marks]

12. (a) Name two phenomena that cause by pollutants and their effects on environment and human being. Namakan dua fenomena yang disebabkan oleh bahan pencemar dan kesannya pada alam sekitar dan manusia.

(b) The uses of petroleum, natural gas and coal in vehicles and factories in large quantities will release pollutants such as sulphur dioxide, nitrogen dioxide and carbon monoxide into the air. These substances will give negative effects to the environment and human being.

Penggunaan petroleum, gas asli dan arang batu pada kenderaan dan kilang-kilang dalam kuantiti yang besar akan membebaskan banyak bahan pencemar seperti sulphur dioksida, nitrogen dioksida dan karbon monoksida ke udara. Bahan-bahan ini akan memberi kesan pada manusia dan alam sekitar.

[4 marks]

Explain the effects of the pollutants and how to overcome the problem. Your explanation should include the following :

Terangkan kesan bahan pencemar dan bagaimana cara mengatasi masalah tersebut. Penerangan anda mestilah mengandungi perkara berikut :

Problem statementPernyataan masalah

Clarification of the problemsPenjelasan masalah

Name three methods to overcome the problem. Namakan tiga cara mengatasi masalah tersebut.

Choose the best method and give the reasonPilih kaedah terbaik dan jelaskan sebab pilihan anda

WHERE THERE IS A WILL, THERE IS A WAYDI MANA ADA KEMAHUAN, DI SITU ADA JALAN