Sec 1 2024 Yio Chu Kang Secondary School Science EOY

Name: Index Number: Class/LG:YIO CHU KANG SECONDARY SCHOOLEND-OF-YEAR EXAMINATION 2024 SECONDARY ONESCIENCE_G31 hour 30 minutesAdditional Materials: Optical Answer Sheet (OAS)1 October 2024(Tuesday)READ THESE INSTRUCTIONS FIRSTWrite your name, index number and class on the cover page.Write in dark blue or black pen.You may use a soft pencil for any diagrams or graphs.Do not use staples, paper clips, glue or correction fluid.SECTION A: Multiple Choice QuestionsThis section consists of fifteenmultiple choice questions. Answer allquestions.For each question there are four possible answers A,B,CandD. Choose the one you consider correct and record your answer in soft pencil in the separate OAS. A mark will not be deducted for a wrong answer.SECTION B: Structured QuestionsThis section consists of structured questions. Answer all questions.Write your answers in the spaces provided.The number of marks is given in brackets [ ] at the end of each question or part question.The use of an approved scientific calculator is expected, where appropriate.A copy of the Periodic Table is printed on page 24. For Examiner’s UseSection A/ 15Section B/ 65Total/ 80Setter: Mrs Chua Xiao YunThis document consists of 21printed pages and3blank pages. www.KiasuExamPaper.com 258

2 LSS G3 END-OF-YEAR EXAMINATION 2024 SECTION A: Multiple Choice Questions [15 marks]Answer allquestions in soft pencil on the separate OAS.1Which of the following is nota responsible application of scientific knowledge?Athe use of antibiotics to treat bacterial infectionBthe use of banned drugs in sports to improve performanceCthe use of solar energy to generate electricityDthe use of vehicles to go from one place to another2What are the physical properties associated with plastic materials?Abrittle, flexible and elasticBpoor conductors of heat, easily moulded and strongCshiny, does not corrode and has low densityDstrong, transparent and has high melting point3Two properties of four substances, W,X,Yand Zare shown in the table below. substance melting point / °C electrical conductivitysolid liquidW1100 good goodX1234 nil goodY2027 nil nilZ15 nil nilWhich of the following substances is most likely a metal?ASubstance WBSubstance XCSubstance YDSubstance Z4Which of these substances would you be able to conclude that it is an element?AA shiny liquid which is a good conductor of electricity.BA shiny solid which cannot be broken down into simpler substances.CA white powder which breaks down and gives off a colourless gas on heating.DA yellow powder which burns to produce a colourless acidic gas.www.KiasuExamPaper.com 259

3 LSS G3 END-OF-YEAR EXAMINATION 2024 5Which of these factors would cause a substance to dissolve faster?I stirringII using a smaller volume of solventIII using smaller size of the substanceAI onlyBI and IIICII and IIIDall of the above6Which diagram correctly represents a mixture containing two different compounds?A BC D7Some copper(II) sulfate salt has been mixed with chalk. Copper(II) sulfate is solublein water but chalk is insoluble in water.What is the correct order for carrying out the stages needed to separate the mixture using water as a solvent?Adissolving in waterevaporating filteringBdissolving in waterfiltering evaporatingCfiltering dissolving in waterevaporatingDfiltering evaporating dissolving in water www.KiasuExamPaper.com 260

4 LSS G3 END-OF-YEAR EXAMINATION 2024 8A petri dish contains a blackish-green powder. When a magnet is placed near the petri dish, black particles are observed to move towards the magnet while the green powder remains at the same position. Based on these observations, what can we conclude about the black particles and green powder?AThe black particles and green powder are not chemically combined.BThe black particles and green powder are present in a fixed ratio.CThe black particles and green powder cannot be separated by chemical means.DThe black particles and green powder must be two different elements.9The diagram shows how a beam of parallel rays bounces off a book surface.Which statement about the reflection is correct?AThe angles of incidence are the same for all rays.BThe angle of incidence is equal to the angle of reflection for each ray.CThe angles of reflection are the same for all rays.DThis is an example of regular reflection. book surface www.KiasuExamPaper.com 261

5 LSS G3 END-OF-YEAR EXAMINATION 2024 10A ray of light is shone at a plane mirror tilted at an angle of 45º to the bench.What is the angle of reflection?ABCD11The figure below shows a group of heart muscle cells.Which level of organisation is most accurately depicted in the figure?AcellBorganCsystemDtissue12Which diagram shows the arrangement of particles inside a balloon filled with helium gas?A B C D mirror light ray bench www.KiasuExamPaper.com 262

6 LSS G3 END-OF-YEAR EXAMINATION 2024 13“Solids have a fixed volume.”Which of the following best explains the above statement?ASolid particles are arranged in an orderly manner.BSolid particles are packed closely together with little empty spaces in between.CSolid particles vibrate in their fixed positions.DThere are strong attractive forces between the particles of solids.14The liquid level in a thermometer rises when it is placed in a beaker of warm water.Which of the following changes takes place in the liquid of the thermometer at a higher temperature? I The particles become further apart.II The particles expand in sizes.III There is an increase in number of particles.AI onlyBI and II onlyCI, II and IIIDII and III only15The chemical formula for the compound calcium carbonate is CaCO3.What are the elements present in calcium carbonate?Acalcium and carbon dioxide onlyBcalcium and cobalt onlyCcalcium, carbon and oxygen onlyDcalcium, copper and oxygen only www.KiasuExamPaper.com 263

7 LSS G3 END-OF-YEAR EXAMINATION 2024 SECTION B: Structured Questions [65 marks]Answer allquestions in the spaces provided.16For a fundraising event, a few groups of students contributed gliding toys which they designed and constructed on their own.The groups were provided with six different materials of the same size. They had to determine the material that can stay the longest in the air. One of the groups planned and carried out the following procedure stated in Fig. 16.1 and recorded their data in Table 16.2.Group members’ names: Amelia, Belinda, Caden, DavidOur project journal Date: 17 May 2024 Venue: ClassroomAim: To determine which material can stay the longest in the air.Procedure:1. Measure 1.0 m height from the ground. Mark the height with a masking tape. The material will be released and allowed to fall to the ground from this height.2. Hold the material (cellophane) at the marking. 3. Start the stopwatch as the material is released and stop the stopwatch when the material touches the floor. This is to measure the timing.4. Repeat Step 3 twice. 5. Record the results and calculate the average time taken in Table 16.2.6. Repeat steps 2 to 5 for the other five materials given.Fig. 16.1Table 16.2materialsfirst timing/ ssecond timing/ sthird timing/ saverage time taken/ scellophane 1.25 1.22 1.25felt 1.15 1.16 1.17 1.16aluminium foil 1.04 1.02 1.03 1.03cloth 1.16 1.17 1.15 1.16paper 1.21 1.22 1.20styrofoam 0.59 1.00 0.58 0.59www.KiasuExamPaper.com 264

8 LSS G3 END-OF-YEAR EXAMINATION 2024 16 (a)Complete Table 16.2 by calculating the average time. [2](b)Explain why the students measured the timing three times for each material and calculated the average time taken. [1](c)