SULIT 4541/3. Answer all questions. Jawab semua soalan.

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Answer all questions. Jawab semua soalan. 1. Diagram 1.1 shows the apparatus set-up to carry out an experiment to compare the hardness of bronze and its pure metal, copper. Rajah 1.1 menunjukkan gambarajah susunan radas untuk membandingkan kekerasan gangsa dengan logam tulennya, kuprum. Diagram 1.1/Rajah 1.1 A steel ball bearing is taped onto the copper block using cellophane tape. A weight of 1 kilogram is dropped at a height of 50 cm to hit the ball bearing. Bebola keluli dilekatkan di atas blok kuprum menggunakan peta selofen. Pemberat 1 kilogram dijatuhkan pada ketinggian 50 cm untuk menghentam bebola. Diagram 1.2 shows the shape of dents formed for the experiment. Rajah 1.2 menunjukkan lekuk yang terbentuk bagi eksperimen itu. Diagram 1.2/ Rajah 1.2 The diameter of the dent made on the copper block is measured. The experiment is repeated by replacing copper block with bronze block. Diameter lekuk yang terhasil di atas bongkah kuprum diukur. Eksperimen tersebut diulang dengan menggantikan bongkah kuprum dengan bongkah gangsa.

Table 1.1 shows the view of the dents made on bronze and copper block. Jadual 1.1 menunjukkan pandangan lekuk yang terhasil di atas bongkah gangsa dan bongkah kuprum. Experiment Eksperimen I Copper kuprum Bronze Gangsa II III Table 1.1/Jadual 1.1 (a) (i) By using the ruler given, measure the diameters of the dents made on copper and bronze blocks. Record all the diameters of the dents in Table 1.1. Dengan menggunakan pembaris yang diberikan, ukur diameter lekuk yang terhasil di atas bongkah kuprum dan bongkah gangsa. Catatkan semua diameter dalam Jadual 1.1 1(a)(i) (ii) Construct a table to record the diameters and the average diameter of dents on copper and bronze blocks. Bina satu jadual untuk merekod diameter lekuk-lekuk dan purata diameter lekuk pada bongkah kuprum dan bongkah gangsa. [3 marka 1(a)(ii)

(b) State one observation that can be obtained from both experiments. Nyatakan satu pemerhatian yang dapat diperoleh daripada kedua-dua eksperimen ini. 1(b) (c) Explain why the weight is dropped three times on each material. Terangkan mengapa pemberat dijatuhkan sebanyak tiga kali ke atas setiap bongkah. 1(c) (d) Based on the average diameter of the dents on copper block and bronze block, state the inference that can be made. Berdasarkan purata diameter lekuk di atas bongkah kuprum dan bongkah gangsa, nyatakan inferens yang boleh dibuat. 1(d) (e) State the operational definition for the hardness of materials in this experiment Nyatakan definisi secara operasi bagi kekerasan bahan dalam eksperimen ini. 1(e) (f) Explain why there is difference in diameter of dents on copper and bronze blocks. Terangkan kenapa terdapat perbezaan dalam diameter lekuk di atas bongkah kuprum dan bongkah gangsa. (g) State the hypothesis for this experiment. Nyatakan hipotesis untuk eksperimen ini. 1(f) 1(g)

(h) Complete table below based on the experiment. Lengkapkan Jadual di bawah berdasarkan kepada eksperimen. Name of variables / Nama pembolehubah (i) Manipulated variable: Pembolehubah dimanipulasi (ii) Responding variable: Pembolehubah bergerak balas (iii) Controlled variable: Pembolehubah ditetapkan : Action to be taken / Tindakan yang akan diambil (i)the way to manipulate variable: Cara untuk memanipulasi pembolehubah: (ii) What to observe in the responding variable: Apa yang diperhatikan pada pembolehubah bergerakbalas: (iii) The way to maintain the control variable: Cara untuk mengekalkan pembolehubah : 1(h) [6 marks] [6 markah] (i) (j) If the weight is placed at a height of 75 cm above the steel ball bearing, predict the diameter of the dent on bronze block. Sekiranya pemberat dijatuhkan pada ketinggian 75 cm di atas bebola, ramalkan diameter lekuk yang terhasil di atas bongkah gangsa. The following is a list of some pure metals and alloys. Berikut adalah senarai beberapa logam tulen dan aloi. 1(i) Duralumin Brass Steel Iron Pewter Aluminium Classify this materials into pure metals and alloys. Kelaskan bahan-bahan tersebut kepada logam tulen dan aloi. Pure metal Logam tulen Alloy Aloi 1(j) Total 33

2. Diagram 2 shows the set-up of apparatus used to investigate the cleansing action of soap and detergent on a piece of cloth stained with oil. Rajah 2 menunjukkan susunan radas yang digunakan untuk menyiasat tindakan pembersihan sabun dan detergen pada pakaian yang dikotori minyak. Experiment Apparatus Observation I Oil stained removed III Oil stained remains Diagram 2/ Rajah 2 Based on the above diagram, plan one laboratory experiment to compare the effectiveness of soap and detergent in hard water. Berdasarkan rajah di atas, rancang satu eksperimen untuk membandingkan keberkesanan sabun dan detergen dalam air liat. Your planning should include the following aspects: Perancangan anda perlu mengikut aspek berikut: (a) Aim of the experiment Tujuan eksperimen (b) All the variables Semua pembolehubah (c) Statement of the hypothesis Pernyataan hipotesis (d) List of substances and apparatus Senarai bahan dan radas (e) Procedure of the experiment Kaedah eksperimen (f) Tabulation of data Penjadualan data [17 marks] END OF QUESTION PAPER