Sec 1 2024 Marsiling Secondary School Science EOY

2 Section A (30 marks)Shade your answers on the separate Answer Sheet provided.1Part of the scientific method involves these four processes.1 collecting evidence by observing and recording2 communication of results3 conducting an investigation4 making inferences and form conclusionsWhat is the correct sequence in which the four processes are applied in the scientific method? A1, 4, 3, 2B3, 4, 1, 2C3, 1, 4, 2D4, 3, 2, 12The symbol below is observed on a bottle.What hazard does this symbol represent?AcorrosiveBflammableCirritantDtoxic www.KiasuExamPaper.com 127

3 3What are the SI units of length and mass?length massAcentimetre gramBcentimetre kilogramCmetre gramDmetre kilogram4Which is an example of a benefit from technology?Adeveloping computer viruses to spread on the internet Bdeveloping dangerous micro-organisms for biological warfareCdeveloping nerve gas for use in a terrorist attackDdeveloping tsunami early-warning systems to reduce casualties5The diagram below shows a pot used for cooking.What is the best material for making the body of the pot and what physical property is taken into consideration?material physical property consideredAmetal electrical conductivityBmetal thermal conductivityCplastic densityDplastic strength www.KiasuExamPaper.com 128

4 6A hardness test is conducted for four materials, W,X,Yand Z.Wis left with a mark when rubbed by X.Yis scratched by the other three materials and is left with a mark.When rubbed byZ, all three materials are left with a mark.Which is the correct order of hardness for the four materials?hardest softestA X> Y > Z> WB Y> W> X > ZC Z > X > W > YD Z > Y > X > W7Which instruments should be used to measure the inner diameter of a plastic tube and mass of a marble?inner diameter of a plastic tube mass of a marbleAdigital calipers electronic balanceBdigital calipers spring balanceCmeasuring tape electronic balanceDruler spring balance8Which option correctly describes air?Aa compoundBa mixture of elementsCa mixture of elements and compoundsDan elementwww.KiasuExamPaper.com 129

5 9Which element is a non-metal?AaluminiumBiodineCpotassiumDsilver10Which statement is true about compounds?ACompounds can be separated by physical methods.BCompounds have fixed melting and boiling points.CCompounds have no fixed composition by mass.DCompounds have the same properties as their constituent elements.11Which row will produce the most concentrated solution?mass of sugar used volume of water usedA5 g 200 cm3B10 g 200 cm3C20 g 300 cm3D40 g 1000 cm312Which factor affects the solubility of a substance?Arate of stirringBsize of solute particlesCsize of containerDtype of solvent13The amino acid glycine has the chemical formula, C2H5NO2.How many different types of elements are present in glycine?A3B4C7D10www.KiasuExamPaper.com 130

6 14Which statement about suspensions are incorrect?1 A suspension is a compound, not a mixture.2 Filtration can separate the constituents of a suspension.3 Light can fully pass through a suspension.4 When left to stand, a suspension will have solid deposits at the bottom.A1, 2 and 4 only B1 and 3 onlyC3 and 4 onlyDall of the above15Which row about separation techniques and the physical properties used to separate substances is correct?separation technique physical propertyAchromatography solubilityBdistillation melting pointCevaporation to dryness solute sizeDfiltration density16Which mixture can be separated with a magnet?Acopper and sandBiron and steelCsalt and plasticDsteel and sandwww.KiasuExamPaper.com 131

7 17Gold panning is a traditional method of separating insoluble gold from other particlesby washing the mixture in a pan with water, as shown below.Which row best describes the method shown and the term used to describe the goldleft in the pan?method term describing gold in panAdistillation distillateBdistillation residueCfiltration filtrateDfiltration residue18Which two separation techniques are used to obtain NEWater?Afiltration and evaporation to drynessBfiltration and reverse osmosisCsimple distillation and evaporation to drynessDsimple distillation and reverse osmosis www.KiasuExamPaper.com 132

8 19A ray of light is directed onto a mirror that is tilted at an angle of 20from the table as shown in the diagram.What is the angle of reflection?A20°B30°C60°D90°20Which statement explains why we can see a non-luminous object?AThe object absorbs all the light that falls on it.BThe object emits light that enters our eyes.CThe object reflects the light that falls onto it into our eyes.DThe object refracts the light that falls onto it into our eyes.21Which item is an example of the application of convex mirrors?Acar rear-view mirrorBcosmetics mirrorCdentist mirrorDsatellite dish22Which row correctly describes a harmful effect and beneficial application of infrared radiation?harmful effect beneficial applicationAdiscoloration of photos photosynthesisBglobal warming thermal imagingClight pollution vitamin D productionDskin cancer sterilisation of utensils tablemirror203060 www.KiasuExamPaper.com 133

9 23Which phrase demonstrates the division of labour in a multicellular organism?Amany cells having the same shape and size for a specific functionBmany organs performing different functionsCone cell changing shape for its functionDone tissue performing a few different functions24The diagram shows part of an onion as seen under a light microscope.Which level of organisation best describes this part of an onion?AcellBorganCorgan systemDtissue25Which statements are true about a cell wall?1 The cell wall gives a cell its fixed shape.2 The cell wall is found in a typical animal cell.3 The cell wall controls the movement of substances in and out of the cell.4 The cell wall protects the cell from damage.A1 and 4 only B2 and 3 onlyC2 and 4 onlyD1, 3 and 4 only www.KiasuExamPaper.com 134

10 26Pollen grains in a transparent container of water are observed using a light microscope.One pollen grain is observed to move around as shown in the diagram below.What does this experiment demonstrate about water molecules?AThey are in continuous random motion.BThey can be seen through a microscope.CThey move more quickly when heated.DThey move due to collisions with the pollen grains.27Which substance has the strongest forces of attraction between its particles?Acarbon dioxide gasBiron barCoilDwater vapour28The diagram shows particles in a solid, liquid and gas.Which arrow represents freezing? www.KiasuExamPaper.com 135

11 29Atoms Xand Ybelong to the same element. Three statements about atoms Xand Yare shown. 1 They can have a different number of protons.2 They can have a different number of electrons.3 They can have a different number of neutrons.Which statement(s) is/are correct? A1 onlyB1, 2 and 3C2 and 3D3 only30The diagram shows an outline of the Periodic Table with five elements.Which statement is correct?AT has more electrons than R.BR and U are classified as metals.CS has a greater mass number than T.DR has the highest number of protons among the five elements.End of Section A www.KiasuExamPaper.com 136