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 Filtra