2023 SGSS 1E EYE LSS - QP

St. Gabriel’s Secondary School 2023 End-of-Year Examination Additional material: Multiple Choice Answer Sheet ▪ Section B: Answer one question. ▪ You are advised to spend no longer than 50 minutes on Section A. INFORMATION FOR CANDIDATES The number of marks of each part-question is shown in brackets. This question paper consists of 24 printed pages including this cover page. Subject : Lower Secondary Science Level/Stream : Sec 1 Express / Sec 1 Normal Academic (SBB) Duration : 1 hour 45 minutes Date : 6 October 2023 Setter : Ms Pang Seok Mun READ THESE INSTRUCTIONS FIRST Write your name, register number and class in the spaces above. You may use a soft pencil for any rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. Section A Answer ALL the questions using the Multiple Choice Answer Sheet provided. Four suggested answers are given f or each question. Cho ose the best answer and use a soft pencil to shade the corresponding circle on the answer sheet clearly. Each question carries one mark. The total marks for this section is 25 marks. Submit your Multiple Choice Answer Sheet separately. Section B Answer ALL the questions in the spaces provided. The total marks for this section is 35 marks. Section C Answer ALL the questions in the spaces provided. The total marks for this section is 20 marks. The number of marks is given in [ ] at the end of each question or part question. A copy of the Periodic Table is provided on page 24. Name: …………………………………………………… ( ) Class: Sec ………… Section B For Examiner’s Use Section A Section C Total 80

2 SGSS/LSS/1E1NASBB/EYE/2023 Section A: Multiple Choice Questions [25 marks] 1 The diagram shows a hazard symbol on a chemical bottle in the science laboratory. What would be the harmful effect if a person is not careful when handling the chemical? A The chemical may cause an explosion when heated. B The chemical may cause damage to body parts when in contact. C The chemical may cause damage to one’s health when breathed in. D The chemical may cause death when it is absorbed through the skin. 2 The air-hole of a Bunsen burner can be opened or closed to obtain two types of flame. Which row shows the correct colours of region X and Y? X Y A blue orange B blue blue C orange blue D orange orange dark blue X Y dark blue flame of Bunsen burner with air-hole opened flame of Bunsen burner with air-hole closed

3 SGSS/LSS/1E1NASBB/EYE/2023 3 A student was carrying out an investigation and made the following claim: “When the current increases, the filament in the bulb turns from red to orange.” Which step of the scientific method is the student carrying out? A asking a research question B constructing a hypothesis C drawing a conclusion D making an observation 4 What is the volume of the liquid in the measuring cylinder? A 22 ml B 23 ml C 24 ml D 25 ml 5 Two physical properties of four substances, E, F, G and H are shown in the table. substance melting point / C electrical conductivity in solid in liquid E 1100 yes yes F 900 no no G 2500 no yes H - 250 no no XXX Which substance is most likely a metal? A substance E B substance F C substance G D substance H

4 SGSS/LSS/1E1NASBB/EYE/2023 6 Solids A, B, C and D have a mass of 1 kg each. Which solid has the highest density? A B C D 7 Which pair of substances consists of non-metals only? A calcium and nitrogen B magnesium and titanium C phosphorus and bromine D potassium and oxygen 8 The diagram shows how sand is removed from a mixture of salt and sand. The substances in beaker 1 are stirred together before being poured through the funnel into beaker 2. At the end of the experiment, what can be found in beaker 2? A a mixture of an element and compound B a mixture of two compounds C one element only D one compound only stirrer funnel beaker 1 beaker 2 water salt and sand filter paper

5 SGSS/LSS/1E1NASBB/EYE/2023 9 A magnet was placed over the cover of a Petri dish containing a black-yellow powder. The black powder was observed to move towards the magnet while the yellow powder remained at the base of the dish. What can be concluded based on the observations made? A The black powder and yellow powder are not chemically combined. B The black powder and yellow powder are present in a fixed ratio. C The black powder and yellow powder are two different compounds. D The black powder and yellow powder have fixed melting points. 10 A mixture containing substances X and Y is placed in two different solvents, water and alcohol. The mixture is then filtered using filter paper. The results are shown below. Based on the results of the experiment, which statement is correct? A Substance X dissolves in alcohol to form a suspension. B Substance X is soluble in water only. C Substance Y is insoluble in both water and alcohol. D Substance Y is soluble in alcohol only. 11 The table shows the solubilities of two salts. salt maximum mass of salt that can dissolve in 100 ml of water at 30 C copper chloride 72 g potassium chloride 34 g XXX At 30 C, which of the following will form a suspension? A 58 g of copper chloride dissolved in 100 ml of water B 96 g of copper chloride dissolved in 200 ml of water C 20 g of potassium chloride dissolved in 100 ml of water D 72 g of potassium chloride dissolved in 200 ml of water substances X and Y water substance Y alcohol and substance X

6 SGSS/LSS/1E1NASBB/EYE/2023 12 Which row correctly states the most suitable separation techniques for obtaining a substance from different types of mixtures? insoluble solid from a solid-liquid mixture soluble solid from a solid-liquid mixture pure liquid from a liquid-liquid mixture A evaporation filtration distillation B evaporation filtration filtration C filtration distillation evaporation D filtration evaporation distillation 13 The table shows the colour of four solid substances, W, X, Y and Z, and their solubilities in water. substance colour solubility in water W green insoluble X green soluble Y white insoluble Z white soluble Water is added to a mixture containing two of the substances, stirred and filtered. A white filtrate and a green residue are obtained. Which are the two substances present in the mixture? A W and X B W and Z C X and Y D Y and Z 14 Which mixture can be separated by magnetic attraction? A aluminium foil and silver rings B aluminium foil and steel nails C iron fillings and steel nails D nickel coin and iron fillings

7 SGSS/LSS/1E1NASBB/EYE/2023 15 While waiting for dinner to be served, Elton looked closely at his reflection on both sides of his metal spoon. Which row correctly states the type of surface and the image formed on the inside and outside of the metal spoon? inside of metal spoon outside of metal spoon type of surface image formed type of surface image formed A concave smaller convex larger B convex smaller concave larger C concave larger convex smaller D convex larger concave smaller 16 A light ray is directed onto a mirror that is tilted at an angle of 25 from the surface of the table. What is the angle of reflection? A 25 B 35 C 55 D 65 inside of the metal spoon outside of the metal spoon

8 SGSS/LSS/1E1NASBB/EYE/2023 17 A narrow beam of white light passes through a glass prism. The white light splits into several colours which are projected onto the screen. Which row shows the correct orde