The number of marks is given in brackets [ ] at the end of each question or part question.

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1 EXAMINATIONS COUNCIL OF SWAZILAND in collaboration with UNIVERSITY OF CAMBRIDGE LOCAL EXAMINATIONS SYNDICATE Swaziland General Certificate of Secondary Education * * COMBINED SCIENCE 6886/02 Paper 2 (Core) October/November hour 15 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your Centre number, candidate number and name on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams, graphs, tables or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. Answer all questions. Write your answers in the spaces provided on the question paper. A copy of the Periodic Table is printed on page 16. You may use a calculator. The number of marks is given in brackets [ ] at the end of each question or part question Total This document consists of 15 printed pages and 1 blank page. DC (NF/JG) 37417/4 [Turn over

2 1 A bag is labelled to show it contains 30 kg of potatoes. A man lifts the bag from the floor to a shelf that is 1.3 m above the floor (g = 10 N / Kg). 2 (a) Calculate (i) the weight of the bag,... [2] the work done by the man on the bag. (b) State the type of energy associated with the bag of potatoes... [2] (i) when it is held 1.3 m above the floor, just before hitting the floor, having been dropped.

3 2 Due to the increase in the rate of HIV infection, it is important that people test for HIV when planning to have children. 3 (a) (i) What does HIV stand for? Suggest the importance of taking an HIV test before having a child [2] (iii) State two ways in which the risk of transmission of HIV between adults may be reduced [2] (b) Fig. 2.1 shows the female reproductive system. A Fig. 2.1 (i) Label as X where an operation is done during sterilisation. [1] State one function of structure A.... [Turn over

4 3 Fig. 3.1 shows part of the Periodic Table. Some elements are represented by letters. 4 The letters are not the chemical symbols of the elements. B C D A E Fig. 3.1 (a) only the letters shown in Fig. 3.1 to answer this question. Each letter may be used once, more than once or not at all. Choose an element that (i) has one electron in the outer shell of each atom, reacts with water forming an alkaline solution, (iii) is a halogen, (iv) is in the same period as D. (b) Write the electronic configuration of an atom of element C.... [2]

5 4 Fig. 4.1 shows part of a rope that is shaken to produce a wave. The rope is tied to a pole at one end. 5 A D C B v i b r a ti o n s Fig. 4.1 (a) Name the type of wave shown on Fig (b) Which letter A, B, C or D on Fig. 4.1 represents (i) the wave length, the amplitude? [Turn over

6 5 Fig. 5.1 shows the structure of the gaseous exchange system. 6 A B C Fig. 5.1 (a) (i) Name the parts labelled A and C. A... C... [2] Name one special type of cell found in structure B. (iii) Describe the function of the cell named in above....

7 (b) Fig. 5.2 shows the structure of the heart. 7 A B C D E Fig. 5.2 (i) Choose one letter that represents an artery on Fig Name structure E and state its function. name... function... [2] (c) (i) Name the blood vessel that supplies the heart muscle with oxygen. Sometimes this blood vessel is blocked. State the condition that results from this blockage. [Turn over

8 6 Fig. 6.1 shows a circuit set up to measure the emf of a simple cell. 8 instrument Z zinc electrode electrode M electrolyte Fig. 6.1 (a) Name the instrument Z.... (b) (i) Name a metal that would be suitable to use as electrode M. Suggest a suitable electrolyte for the cell in Fig (c) (i) State the energy changes that occur in Fig energy... energy [2] Describe the change that will be observed on the zinc electrode. (iii) When the zinc electrode is replaced by a magnesium electrode, the reading of instrument Z increases. Explain why the reading of instrument Z increases [2]

9 7 Fig. 7.1 shows the information plate on an electric heater V 8 A Fig. 7.1 (a) State the current in the heater when it is operating normally.... (b) Calculate the resistance of the heater when it is operating normally.... [3] (c) The heater is connected with many other appliances into one socket. State a hazard that may be caused by this.... [Turn over

10 8 Ethanol burns in air. 10 (a) Write a word equation to represent this reaction.... [2] (b) (i) Name a process by which ethanol may be produced at room temperature. The process in (b)(i) slows down as the temperature increases above 30 C. Explain this observation [2] 9 Fig. 9.1 shows a ray of light entering a rectangular glass block. Complete the path of the ray as it goes through the glass block and emerges again. glass block Fig. 9.1 [3]

11 10 A farmer bought 5 ducks, 3 females and 2 males. He had plenty of maize to feed them for about a year. After 5 months, 8 offspring were produced. Thereafter the duck population increased rapidly. However, one duck was eaten by dogs and another died of an unknown illness. The farmer and his family ate some of the ducks. By the end of the second year only 2 ducks were left. 11 The changes in the size of the duck population over the two years are shown in Fig Duck population Time Fig (a) Explain the meaning of the term population [2] (b) Name the characteristic of living organisms that led to the rapid increase in the duck population in stage (c) Give two reasons mentioned in the passage that led to the decline of the population in stage [2] (d) Using only information from the passage, construct a food chain. [2] (e) Explain why food chains rarely have five or more links in an ecosystem [2] [Turn over

12 11 (a) Three surfaces of the same material are painted white, silver and black. 12 State which surface is best for (i) absorbing heat, emitting heat. (b) Give two features of a vacuum flask that reduce heat loss by conduction [2] (c) Name the state of matter which expands most when heated....

13 12 (a) Air is a mixture of gases. Name a gas in air that is: 13 (i) a product of respiration... used in the manufacture of ammonia... (iii) used in filling weather balloons... [3] (b) Technological advances have greatly improved our lives, but they also have adverse effects on the environment. (i) State the term used to refer to the damage in the environment caused by chemicals. Car exhaust fumes contain some of the substances that damage the environment. State two examples of such substances and describe one effect of each substance. 1 substance... [1] effect [1] 2 substance... [1] effect [1] [Turn over

14 14 13 A student connects the circuit shown in Fig The reading on A 1 is 0.5 A and the reading on V 2 is 8 V. 12 V A A A 2 R 1 R 2 V 1 V 2 8 V Fig State the reading on: (a) A 2... (b) V The following materials are provided: copper iron lead steel. State and explain which material is best for (a) the core of an electromagnet, material... [1] explanation (b) storing radioactive substances. material... [1] explanation......

15 15 BLANK PAGE Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (ECOS) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity.

16 16 DATA SHEET The Periodic Table of the Elements Group I II III IV V VI VII H Hydrogen 2 4 He Helium 3 7 Li Lithium 4 9 Be Beryllium 5 11 B Boron 6 12 C Carbon 7 14 N Nitrogen 8 16 O Oxygen 9 19 F Fluorine Ne Neon Na Sodium Mg Magnesium Al Aluminium Si Silicon P Phosphorus S Sulfur Cl Chlorine Ar Argon K Potassium Ca Calcium Sc Scandium Ti Titanium V Vanadium Cr Chromium Mn Manganese Fe Iron Co Cobalt Ni Nickel Cu Copper Zn Zinc Ga Gallium Ge Germanium As Arsenic Se Selenium Br Bromine Kr Krypton Rb Rubidium Sr Strontium Y Yttrium Zr Zirconium Nb Niobium 96 Mo Molybdenum Tc Technetium Ru Ruthenium Rh Rhodium Pd Palladium Ag Silver Cd Cadmium In Indium Sn Tin Sb Antimony Te Tellurium I Iodine Xe Xenon Cs Caesium Ba Barium 139 La Lanthanum 57 * Hf Hafnium Ta Tantalum W Tungsten Re Rhenium Os Osmium Ir Iridium Pt Platinum Au Gold Hg Mercury Tl Thallium Pb Lead Bi Bismuth 84 Po Polonium 85 At Astatine 86 Rn Radon Fr Francium Ra Radium 227 Ac Actinium 89 * Lanthanoid series Actinoid series Key b a X a = relative atomic mass X = atomic symbol b = atomic (proton) number Ce Cerium 232 Th Thorium 141 Pr Praseodymium Pa Protactinium Nd Neodymium 238 U Uranium Pm Promethium Sm Samarium Eu Europium Gd Gadolinium Tb Terbium Dy Dysprosium Np Neptunium 94 Pu Plutonium 95 Am Americium 96 Cm Curium 97 Bk Berkelium 98 Cf Californium Ho Holmium Es Einsteinium Er Erbium Fm Fermium Tm Thulium Md Mendelevium Yb Ytterbium No Nobelium Lu Lutetium Lr Lawrencium 103 The volume of one mole of any gas is 24dm 3 at room temperature and pressure (r.t.p.).

This resource contains three different versions of the periodic table, including a blank one for colouring!

Teaching notes This resource contains three different versions of the periodic table, including a blank one for colouring! It also contains tables of the Group 0, 1 and 7 elements with a few columns for