science eoy sec 1

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BP-3 BEDOK SOUTH SECONDARY SCHOOL END.OF.YEAR EXAMINATION 2022 REGISTER NUMBER CANDIDATE NAME CLASS LOWER SECONDARY SCIENCE t I Octobcr 20i!2 2 houriCandidates answer on the OMS and Ouestion Booklet. READ THESE IiISTRUGTIOI{S FIRST Writ6 your class, rogisler numb6r and name on all the work you hand in. Writ6 in dart blu6 or black pen, excepl for Sec,tion A. You may use a sofi poncil for any diagrams or graphs. Do not use staplos, paper clips, highlighters, glue, or conection lluid. This psper coarsisG of three soctions. You are required to answer ALL questions in Seclion A and I and FOUR quostions in Section C. SECTION A (30 ma*s) Thare are 30 quostions. Answer ALL questions. For each question there are four po$ible answers, A, B, C and D. Choose the one you consider correct and rocord your choics in 3oft peflcll on the OMS provided. SECTION B (30 mrrks) Ans!rcr ALL qu$tions in the spaces provided. Wrile your answars in the spaces provided on ths queslion paper SECTION C (10 ma.ks) Answ€r only foui quostions in this seclion. Wrile dol n your enswers in lh6 spaces providod on the question paper. Th6 us6 of an approved scienlifc calculator is expected, when appropriate Omla.lon ot $3.ntl.l wo*lng wlll result ln lo33 of martS. Round off all non-gxect ans\./ers to 3 significant figures. Tha number of marks is given in brackots [ ] at the end of each qusstion or parl queslion. A copy of th6 Psriodic Table is printed on page 3!1. Setter Mr Huborl Song For Examinor's Use Section A Section B 30 Section C 40 Total 100 This paper consists of ]! printed pages including this cover page PartnerlnLeaming 1 lEXP 30

BP.4 2 SECTION A: ilultiple Choice Qu6stions (30 marks) Each question below is provided with four answers. Select the conect answer and shade either A, B, C or D in the OMS provided. What is the conect order of steps to be canied out for a scientific method of investigation? 1 I I ilt IV draw conclusion record and analyse the results plan and carry out experiments identify an investigative question propose a hypothesis A IV)V) B IV)V) c v)tv) D V)IV) ilt )il)t t)ilt )il ilt )il)t t)ilt )il 2 Two labels are found on the bottle of an unknown liquid Which statement best describes this unknown liquid? A corrosive chemical and releases orygen easily B leads to allergic reaction to skin and may cause explosion G causes harmful effect to body and may cause oxygen deficiency D causes severe skin injury and breathing difficulty ParlnerlnLearning 2 ffurn Over

BP-5 3 4 3 Which row describes the flame that is more suitable for heating in the laboratory? Which is not an Sl unit? A gram B Joule C Kelvin D metre 5 A plastic ruler is used to measure the diameter of five plastic balls. rlllflrirIilllrill [[tfi lfl [ru[pxurfiryn[mFrll[qrrrr[mlllrrlmptwr 0 1 2 3 4 5 6 ? 8 9 10 What is the average diameter of each ball? A 0.66 cm B 0.70 cm G 0.82 cm D 3.50 cm PartnerlnLeaming J shape of flame air hole of Bunsen bumer A B c D steady unsteady steady unsteady close close open open flurn Over I

BP-6 4 6 A pair of Vemier calipers is used to measure the depth of a cup. The reading on the Vemier calipers is shown. 7 0 8 j 7 Which row is conec{? part of Vemier calipers depth / cm A B c D inside jaw inside jaw tail tail 7.02 7.',t2 7.O2 7.12 The experimental set-up shows some standard masses being hung onto material X, one at a time. ur{oaded malerial X loaded slandard masg€s Which property of material X is being investigated in this experiment? A density B hardness C strength D thermal conductivity PartnerlnLearning 4 flurn Over I I - .l i a

BP-7 8 5 An experimental set up is shown. The mass ofthe cork is 3 g. a1 cork sin ker What is the density of the cork? A 0.20 g/cnr3 B 0.75 g/cm3 C L00 g/on3 D 1.33 g/on3 Which list of substances consists of only elements and compounds? A steam, orange juice and air B muddy water, aluminium and air C aluminium, water and carbon dioxide D ethanoic acid, orange juice and muddy water 10 Which statements are incorrect? A solution is a new compound. A suspension is not a compound but a mixture. A solution is a mixture in which one or more solutes dissolved in a solvent. When left to stand, a suspension does not have solid particles settling to the bottom. A lll and lV only B I and lV only C I, lll and lV only D all of the above 50 ao x) sinker 9 I il ilt PartnerlnLearning 5 flurn Over 1 wIEl.-flI t-1I td tti I l"_Etti -+P1E I 20 lo t0 HL

BP-8 11 6 A mixture of two liquids is bEing distilled. At which point will there be the liquid with higher boiling point? thermometer mixture ol liquids D 12 The table shows the readings of an object of 20.0 g from different sets of electronic balance. reading 1 / g reading 2 / g reading 3 / g 17.3 17 .6 17.5 Which description of the 3 readings is correct? A high accuracy but low precision B low accuracy but high precision C high accuracy and high precision D low accuracy and low precision A B c Iheat PartnerlnLearning 6 ffurn Over lal - L-4t---:)

BP-9 13 7 An electric kettle boils water using a heating element as shown water heating element The physical properties of four materials are given in the table. Which material is most suitable for making the heating element inside a kettle? material melting point /'C thermal conductivity A B c D 980 361 153 72 low high low high 14 A very old painting has been sprayed accidentally with new paint. The solubilities of the old paint and the new paint in solvents A, B, C and D are shown in the table. Which solvent could be used to remove the new paint without damaging the original painting? solvent old paint new paint A B c D soluble soluble insoluble insoluble soluble insoluble soluble insoluble ParlnerlnLeaming 7 flurn Over \:I I I I

BP-10 8 15 Gold panning is a traditional method of separating insoluble gold from other particles by 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 gold left in the pan? method gold in the pan is known as A B c D evaporation filtration filtration distillation residue residue filtrate distillate l6 The diagram shows a chromatogram with different ink samples. start line black blue brown green red yellow Based on the chromatogram, which statement is correct? A Black ink can be made by mixing green, brown and yellow inks B Brown ink is a mixture of two inks. C Yellow ink may be present in black ink. D Red ink and blue ink are pure substances. a a a a a a a I a a PartnerlnLeaming 8 flurn Over -/ fr I

BP- I1 9 17 Shopkeepers use security mirrors to monitor the customers in their shop. Which option shows the type of mirror used and the correct reason for its use? 18 130' incident ray What is the angle of reflection? A 20" B 40" c 50' D 130' 19 Which light ray shows the conect path of a ray of light emerging through a glass block? incident ray c A B c D The diagram shows a ray stiking a plane minor A DB type of mirror reason concave convex concave plane the image is bigger and clearer a wider view can be seen a wider view can be seen the image is upright PartnerlnLeaming 9 ffurn Over