Sec 1 2024 Woodlands Secondary School Science EOY

1 G3SUBJECT LEVELG3SUBJECT LEVELName: ____________________ ( ) Form Class/Subject Group: __________/__WOODLANDS SECONDARY SCHOOLEND-OF-YEAR EXAMINATION 2024Subject Level: G3 Marks: 100Subject: Lower Secondary Science Day: FridayPaper: - Date: 4 October 2024 Duration: 2 hours Time: 0800 – 1000 ____________________________________________________________________READ THESE INSTRUCTIONS FIRSTWrite your index number, name and class on all the work that you hand in.Do not use staples, paper clips, glue or correction fluid. Section AWrite in soft pencil. There are thirtyquestions in this section.Answer allquestions. For each question there are four possible answers A, B, C and D.Choose the one you consider correct and record your choice in soft pencil on the separate Optical Answer Sheet. Each correct answer will score one mark.Section B and CAnswer allquestions. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs.Write your answers in the spaces provided on the question paper.You may lose marks if you do not show your working or if you do not use appropriate units.A copy of the Periodic Table is printed on page 22. The use of an approved scientific calculator is expected, where appropriate. The number of marks is given in brackets [ ] at the end of each question or part question.For Examiner’s UseSection A Section B Section C Total/30 /40 /30 /100DO NOT TURN THE PAGE UNTIL YOU ARE TOLD TO DO SO.This document consists of 22 printed pages. Secondary 1 www.KiasuExamPaper.com 229

2 G3SUBJECT LEVEL G3SUBJECT LEVELSection A (30 marks)Answer allquestions. Shade your answers on the Optical Answer Sheet provided.1Ethanol causes fire readily when reacts with oxygen in the air.Sodium hydroxide attacks tissues.Potassium nitrate decomposes to release oxygen which supports burning.Which of the following lists the correct examples of chemicals with the given hazard symbols? Aethanol sodium hydroxide potassium nitrateBsodium hydroxide ethanol potassium nitrateCsodium hydroxide potassium nitrate ethanolDpotassium nitrate ethanol sodium hydroxide2A scientist wanted to produce membrane of a certain thickness. He repeated the experiment 10 times, always producing membranes of the same thickness but not the ideal thickness that he wanted.Which of the following best describes his results?accuracy precisionAhigh highBhigh lowClow highDlow low3Which of the following instruments is most appropriate to determine each measurement?volume of water diameter of thin wire mass of a ballAmeasuring cylinder digital calipers electronic balanceBmeasuring cylinder ruler weighing machineCtest tube digital calipers electronic balanceDtest tube ruler weighing machine www.KiasuExamPaper.com 230

3 G3SUBJECT LEVEL G3SUBJECT LEVEL 4A student was instructed to cut threads that are 15.0 cm in length. He used a ruler to measure each thread.Which is the correct position of his eye to make the most accurate measurement? C B D A 5The diagram shows what happened when a stone was placed into the displacement can.Which of the following can be measured using the method shown?AThe density of the stoneBThe density of waterCThe mass of the stoneDThe volume of the stone6The table shows some differences between milo drink and sugar solution.Which of the following correctly shows the difference between them?milo drink sugar solutionAclear cloudyBdoes not allow light to pass through allow light to pass throughC homogenous not homogenousDno particles settle at the bottom many particles settle at the bottom7Which of the following is nota property of fibres?A able to absorb dyes B can be spun into threadsC fragileD poor conductors of heat displacement can water measuring cylinder stone water collected Before placing the stone in water After placing the stone in water www.KiasuExamPaper.com 231

4 G3SUBJECT LEVEL G3SUBJECT LEVEL8How many different types of elements are present in ammonium hydroxide, NH4OH?A3B4C5D79Three substances, A, B and C were dissolved in equal volumes of three different solvents, X, Y and Z to test their solubility. The results are shown in the table.solventsubstance dissolved in grams / gA B C X 30 19 11Y 24 13 7 Z 9 10 12Which of the following is true?AA is the most soluble solute for all three solvents.BA, B and C are best dissolved in solvent Y.CB is least soluble in solvent X compared to A and C.DC is more soluble than B in solvent Z.10A student boiled some water using the set-up shown in the diagram.How many of the labelled substances are elements?A1B2C3D411Which of the following consists of compounds only?Abaking soda, sugar, common salt, waterBbrass, oil, wood, magnesiumCcarbon dioxide, sea water, nitrogen, chalkDsodium, rust, plastics, steel glass beaker boiling water copper gauze iron tripod stand methanewww.KiasuExamPaper.com 232

5 G3SUBJECT LEVEL G3SUBJECT LEVEL12Which of the following properties cannotbe used to separate mixtures?Aboiling pointBchemical reactivityCmagnetic propertyDsolubility of solute13The diagram shows the set-up to separate sea water.Which of the following statement is true?AA thermometer should be placed in X to measure the temperature of boiling water.BThe change in state from liquid to gas occurs at Y.CThe condensation of the vapour takes place at Z. DThe temperature at X is exactly at 100C when sea water boils.14Grains of uncooked rice are added to fine salt in a saltshaker to keep the salt dry and prevent it from clumping.How is salt and uncooked rice separated when the saltshaker is used to sprinkle salt over food?ABy magnetic attractionBBy filtrationCBy evaporationDBy dissolving uncooked rice grain steel cap fine salt Y X Z water in water out heat www.KiasuExamPaper.com 233

6 G3SUBJECT LEVEL G3SUBJECT LEVEL 15Which of the following uses a membrane to remove salt from seawater to produce drinking water?AchromatographyBevaporationC reverse osmosisD simple distillation16Mary stands 3.0 m in front of a mirror. There is a box located 4.0 m behind her.What is the distance from Mary’s eye to the image of the box?A4.0 mB7.0 mC10.0 mD14.0 m17Which of the following statements about a convex mirror is notcorrect?AIt helps people to see objects around blind corners. BIt produces images with the same size as the object.CThe images produced in a convex mirror is virtual.DThe corner mirrors in the shops to prevent shoplifting are convex mirrors.18A spectrum is formed when white light passes through a prism.In which position are the colours green, red and yellow seen?1 2 3 Agreen red yellowBgreen yellow redCred green yellowDred yellow greenwww.KiasuExamPaper.com 234

7 G3SUBJECT LEVEL G3SUBJECT LEVEL19A thermal imaging camera was used to observe leaves of plants.What information can be gathered about the leaves from directly observing the image on the thermal imaging camera?Aamount of food made by the leavesBamount of visible light the leaves used for photosynthesisCcolour pigment of the leavesDtemperature of the leaves20Which of the following is nota function of a cell wall?Iprotects cells from injuryIIcontrols substances entering or leaving the cellIIIgives cells a regular shapeA IonlyB IIonlyC Iand IIonlyD Iand IIIonly21A student views a specimen of blood under a light microscope.Which of the following best describes the specimen?AorganBorganismC system D tissue 22Which of the following shows a limitation of using models to study cells and matter?AModels are representations of phenomena in the real world.BM