ACSBR Sec 2 Science 2021 EOY

BP-4 Strrdnfiqtu tllqorl(patlr&'i) ENDOF.YEAR EXAMINATTON 2021 SECONDARY TWO EXPRESS SCIENCE Duration: 2 hours SECTION A INSTRUCTIONS TO GANDDATES: The use of an approved scientific calculator is expected, where appropriate' Do not use glue or conection tape or fluid. Seclion A it"r",r" four possible answers, A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate OTAS answer sheet Each conecl answer will score one mark. A mark will not be deducted for a wrong answer' Any rough working shouH be done in this booklet. This question paper consists of 10 pinted pages. PartnerlnLearning

BP-5 A2 ,4rglo-Chh€se Schoo/ (Batuer Road) SECTION A (30 marks) Select the best answer and shade it in the OTAS provided A1 Which development shows an example of the abuse of scientific applications? A The development of biodegradable products. B The development of new source of energy. C The development of organic food. D The development of pure samples of heroin for consumption. Joseph wants to compare the amount of water absorbed by two brands of tissue paper. The experiment set{p is shown in the figure below. Ussue paper water Which of the vanables are classified correctly? A3 Which method is not used for separating substances physically? chromatography elecffolysis evaporation magnetic separation N Compound X is formed when elements S and T are mixed and heated in a test tube. Whicfi statement about compound X is incorrect? A Compound X has properties that are differenl from elements S and T. B Compound X is made up of two elements. C Elements S and T can be obtained from compound X by physical means. D The proportion by mass of elements S and T in compound x is fixed. A B c D dependent variabb independent variable A B c D brand of tissue paper amount of water absorbed amount of water used for the experiment brand of tissue oaoer amount of wat6r absorbed brand of tissue paper brand of tissue paper arnount of water used for the experirnent End-Of-Ye at Ex a m h atio n 2021 PartnerlnLearning 4 Socoodaty 2 Exprosg Scb/re

BP-6 Anglo-Chinese School (Batuer Road) A5 The diagram shows the drawing of an ant 2.1 cm What is the magnification if the acfual length of the ant is 0.6 cm? A6 Whicfr statement about an atom is true? A An alom always has equalnumbers of electrons and neutrons. B The nucleus of an atom always contains protons and neutrons. C The nucleus of an atom is eleclrically neutral. D The mass of an atom is concentrated in its nucleus. The diagram bebw shows the anangement of particles in a substance at 100 'c and 140 'c. 100 'c 140 "C ') What could be the metting point and boiling point of the substance shown? metting point / boiling point/oc A B c D -120 20 40 120 -80 40 125 180 A8 A boy is standing 2.0 m in front of a mirror. His cat is sitting 3.0 m behind him. lf the cat walks 1.5 m towards the minor, how far is the boy away from the cat's image in the minor? A 3.5m B 5.0m G 5.5m D 7.0 m End-Of-Year Ex atuin ation 2021 PartnerlnLearning E O.2x 1.3x 3.5 x 5.0 x A B c D 3 ++r- - l secotdary 2 Express Scierrce A7 tt tl o

Ag The diagram shows a ray of light entering a glass prism PRTSU What is the colour obserued at X aM Y respectively? A10 The diagram shows the human circulatory system. capillaries of the lungs Which two vesseb carry oxygenated blood? Anglo-Chineso School @artor Road) capillaries of the rest of the body A B c D 1and2 '1 and 4 2and3 2and4 All The diagram shows the female reproductive system. Where does fertilisation occur? PartnerlnLearning 6 A B D c 4 colour al X colour at Y A B c D red red violet violet violet red red violet heart End-Of-Yeat Ex amh alion 202 1 Secot ary 2 Express SiJqDca BP-7

BP-8 Ansla-Chineso Schoal (Ba*ot Road) A12 An electrical circuit is set up as shown. what are the directions of the electron flow and conventional current flow through the bulb? direction of the electron flow dtrection of th conventionaI curTen t flow A B c D JtoK JtoK KtoJ KtoJ JtoK KtoJ JtoK KtoJ A13 Circuit I shows a wire of length 1 .0 m wh ich has a resistance of 2.0 O. When connected to a dry cell, the cunent in the wire is 3.0 A. 3.0A 1 .0 m wire of resistance 2'0 o Circuit I circuit ll shows a 2.0 m length of the same wire which is connected to the same dry cell. 2.0 m wire of resistance & Circuit ll Whidr row conectly describes the readlngs of the resistance and cunent? PartnerlnLearning 7 KJ resistance / O current / A A B c D > 2.0 > 2.0 < 2.O = 2.0 Rz Rz R, Rz > 3.0 < 3.0 Az Az Az Az > 3.0 = 3.0 End-Of-Ye at Ex a fi kation 2021 Sec@tdary 2 ExprcssSclence

BP-9 Anglo-C hirrese School (Bartet Road) A14 Kristine is participating in a 16 km race. There are 2 compulsory hydraton stations (each lasting at least 2 minutes) abng the track wherB all runners must stop to have a quick drink. lf Kristine is running al an average speed of 12kdh, what is the minimum time that she would take to complete this race? 45 min 49 min 'l h 20 min t h 24 min A15 Which action does not involve a contact force? A a needle in a compass pointing north B hitting a baseball C sweeping the floor D turning the steering wheel ofa car A16 What is the S.l. unit for work? Joule Pascal Newton Watt A17 Which energy sources and their uses are correctly matched? PartnerlnLeaming I A B c D A B c D 6 enerqy sources USES A B c D biofueb geothermal energy geothermalenergy solar energy fossilfuels hydroelec{ric energy hydroeleclric energy wind energy to generate electricity used for heating to power vehicles to generate electricity to generate electricity used for heating to power vehicles to qenerate electricity End-Ot-Yeat E x amh ation 202 1 se@ndary 2 Exp.aes Sc€rrcg

BP"1() A18 Some energy sources and their impacts are listed' 1 Biofuels - plays a part in global warming 2 Geohermal energy - may cause sink holes 3 Hydroelectric energy - may cause extensive flooding 4 Solar energy - no pollutants released 5 Wind energy - produces ultrasound Anglo-chi.resa Schoo, (Batuer Road) Which of the impacts are mrrectly listed? 2,3, 4 and 5 2, 3, and 4 onlY and 5 only 3,4and5only A B c D A B c D 1, 't, 1 2, 419 Which stalement describes sound waves? A The particles vibrate in circular motions in a medium' B The particles vibrate randomly in a medium. C The particles vibrate to and fro along the axis in a medium ' D The particles vibrate up and down along the axis in a medium' A2O How does sound waves travel in the human ear? cochlea ) ear canal ) ear drum cochlea ) ear drum ) ear canal ear canal t ear drum ) cochlea ear drum ) ear canal ) cochlea 021 Whici row conectly describes the type of signals passed on from the part of the ear? part of ear tvpe of signal A B c D coch lea ear bones ear drum ear nerve electrical imPulses electrical impulses and vibrations chemical vibrations A22 which measure does not counter expansion of matedals during hot weather? A bends in pipes B electrical cables hanging loosely C gaps between tiles D rollers under girder bridges PartnerlnLearning o 7End -Of-Ye ar Ex a n h ation 2021 Se@ndary 2 Ex,/essScisrca

BP-11 Anglo-Chinese School (Barter Road) A23 Whidr shows the temperature in S.l. units of boiling water? 100'c 100 'K 212 "F 373 K M4 Whicfi parl of the thermos flask reduces heat transfer by radiation? cap matt black plastic wall shiny interior wall vacuum wall A25 The diagram shows a boy cooking a sausage on a metal fork. He holds lhe sausage and the fork in a fire. s hand metal io* Whidr set of diagrams represents how heat is conducled to the boy's hand? A B c D A B c D n rnotal brk befora heatng rOOrOl OOro OIo'o!occ metal fork metal fork - during heating - af erd ofheatirg ooooooOO€.O.lo|o. PartnerlnLearning 10 A B c D key atofiro ,lb."ting abrn o vibtdn4 mpidty 8 Orror O O O O ooo o o o rooro o o ooooooo o o o oooo o o ooo loOIo.o.ooorooso oooo o oooso o o oo o o oqo o o oo oooooooooooo oooooooooooo roo o o o oo'o o o o o oooo o ooooo o o oooooooooooo ooocooOO0OTOO O O o{lo,loO O OO'Olo ooo.ooo.olo|ol*