PAPER. Practice Questions SCIENCE. International Competitions and Assessments for Schools STUDENT S NAME: DO NOT OPEN THIS BOOKLET UNTIL INSTRUCTED.

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ractice uestions nternational ompetitions and ssessments for chools U U. U : ead the instructions on the and fill in your, and. Use a or pencil. o use a pen. ub out any mistakes completely.

1 ractice uestions nternational ompetitions and ssessments for chools U U. U : ead the instructions on the and fill in your, and. Use a or pencil. o use a pen. ub out any mistakes completely. ou U record your answers on the. ark only answer for each question. our score will be the number of correct answers. arks are deducted for incorrect answers. Use the information provided to choose the answer from the four possible options. n your fill in the oval that matches your answer. ou may use a calculator and a ruler.

2 or questions and use the information below. he flow chart distinguishes between some classes of stars. ll stars yes re strong metallic lines present in the spectrum? no re titanium oxide lines present? re strong hydrogen lines present? yes no yes no lass s the surface temperature greater than 6 000? lass s the surface temperature greater than 0 000? yes no yes no lass s the spectral colour yellow? lass lass yes no lass lass. he un is a lass star. hat are some characteristics of the un? () titanium oxide and strong hydrogen emission lines present, surface temperature greater than 6000 () strong metallic lines present, surface temperature greater than 6000 () strong metallic lines present, spectral colour yellow () strong titanium oxide lines present, spectral colour yellow. irius is a white star which has a surface temperature of ts spectrum has hydrogen but no strong metallic lines. hat class of star is irius? () () () () lass lass lass lass cience ractice uestions aper

3 . he table compares the tensile strength of some common materials. aterial muscle cartilage house brick tendon bone (elderly) bone (young adult) glass nylon thread ensile strength (m ) pproximately how many times stronger is nylon thread than tendon? () 0.08 () () 8 () n order to -ray the digestive system, it is necessary to swallow a dense and very insoluble substance which will not react with the chemicals (mainly water and hydrochloric acid) in the stomach. nformation about some substances is given in the table. ubstance ensity (gcm ) olubility in water (g00 m) eaction to hydrochloric acid caesium carbonate reacts to form carbon dioxide iron() hydroxide reacts to form iron () chloride barium sulfate does not react magnesium sulfate does not react hich substance shown would be most suitable for use when raying the digestive system? () () () () caesium carbonate iron() hydroxide barium sulfate magnesium sulfate cience ractice uestions aper

4 5. scientist wanted to investigate the effects of two types of antibiotics, and, on the growth of a bacterium,. coli. e grew five cultures of the bacterium in a growth medium placed on separate etri dishes like the one shown. nformation about the preparation of the five dishes is shown in the table. etri ish xperimental ondition mount of growth medium in dish (m) ype of antibiotic added to dish mount of antibiotic added to dish (m) emperature at which dish is kept ( ) hich two dishes should he use to compare the effects of and on the growth of the bacteria? () and () and () and () and or questions 6 and 7 use the information below. erial dilution is a procedure used to make a very dilute solution. he procedure for diluting a solution of copper sulfate is shown. ml ml ml (0 m) 6. ow many times more concentrated is the initial solution than the solution in tube 4? () () () () 0000 times 000 times 00 times 0 times 7. student estimated that there were particles of the dissolved substance in the initial solution. ow many dilutions would she have to perform to obtain a solution with approximately 00 particles of the dissolved substance? () () 4 () 5 () 6 cience ractice uestions aper 4

5 or questions 8 and 9 use the information below. eports about science experiments often include: a title an introduction an aim a method of how the experiment was to be carried out results (what was observed) a discussion of the results a conclusion student wrote a report containing a number of points. 8. hich points are the students results? () 4 and 5 () 5 and 6 () 6 and 7 () 7 and 8 9. as the students conclusion correct? hy? onclusion correct? eason () no he marble went through the water the slowest. () yes he marble went through the water the slowest. () yes he marble went through the honey the slowest. () no he marble went through the honey the slowest. 5 cience ractice uestions aper

6 0. ares apparatus is used to compare the densities of two liquids. tep tep clip open vacuum pump switched on height clip closed after air is drawn out height liquid liquid liquid liquid he height that the liquids rise can be calculated from: density (liquid ) density (liquid ) = height (liquid ) height (liquid ) student performed an experiment with ares apparatus using dichloromethane (density. gcm ) and trichloromethane (density.98 gcm ). hich of the following could be the height each liquid rose in the tube? eight of dichloromethane (mm) eight of trichloromethane (mm) () () () 90 0 () 0 90 cience ractice uestions aper 6

7 his page may be used for working. cience ractice uestions aper 7

8 cknowledgment opyright in this booklet is owned by ducational ssessment ustralia, U lobal ty imited, unless otherwise indicated. very effort has been made to trace and acknowledge copyright. ducational ssessment ustralia apologises for any accidental infringement and welcomes information to redress the situation. he following year levels should sit aper: ustralia ear 9 runei orm 4 ong ong orm ndonesia ear 0 alaysia orm ew ealand ear 0 acific ear 9 ingapore econdary outh frica rade 9 U U ducational ssessment ustralia eaa.unsw.edu.au 00 ducational ssessment ustralia. is an education group of U lobal ty imited, a not-for-profit provider of education, training and consulting services and a wholly owned enterprise of the University of ew outh ales

9 to appear on certificate to appear on certificate re you male or female? ale emale oes anyone in your home usually speak a language other than nglish? es o chool name: own suburb: odays date: ostcode: ay onth ear (optional) U U U U U U U U U U U U U U U U U U U U U U U U U U U U U U U U U U U U U U U U U U U U : ub out all mistakes completely. rint your details clearly in the boxes provided. ake sure you fill in only one oval in each column. : ebbie ach : han i eng : amal bin bas U U *045609* aper nternational ompetitions and ssessments for chools U

10 U xample: ri added cordial to water to make a jug of drink. hat will be the volume of the drink in the jug? () () () () 50 m 50 m 00 m 50 m he answer is 50 m, so you would fill in the oval, as shown our privacy is assured as fully complies with appropriate ustralian privacy legislation. isit for more details. aper nternational ompetitions and ssessments for chools

11 U key reasoning orking backwards from lass: the un is spectral colour yellow, has a surface temperature < 6000 (so and are wrong), does not have titanium oxide lines (so and are wrong) but it does have strong metallic lines present in the spectrum. irius does not have strong metallic lines but has strong hydrogen lines. he temperature is irrelevant to this question. 050 =.8 asy n order to -ray the digestive system, it is necessary to swallow a dense and very insoluble substance. rom the table, barium sulfate has the highest density and lowest solubility; it also does not react with hydrochloric acid. nly the last two chemicals do not react with hydrochloric acid, so answers and are wrong. agnesium sulfate is less dense and more soluble than barium sulfate, so is wrong. o compare the effect of the two types of antibiotics on the growth of bacterium,. coli, the scientist needs to make sure that all other possible variables were kept the same except for the antibiotic used. his only happens in petri dishes and. m ach test tube changes by a factor of 0 m in 0 m or. 0 m ube is 0 times more concentrated than tube 4. ube is 00 times more concentrated that tube 4 while tube is 000 times more concentrated than tube 4. ach dilution reduces the concentration by a factor of 0. herefore to reduce to 00 we have to divide four times by 0. esults are observations made using our five senses, particularly sight. e can see the marbles above the jars at time = 0 s, and we can see the jars with the marbles in them at t = s, at different positions within the liquids. o point 6 and point 7 of the report are observations. ote that which liquid is the most or least viscous is an inference which is based on observations. t itself is not an observation. he more viscous the liquid, the slower the marble will pass though it. fter s the slowest marble will have moved the smallest distance. his occurs in honey; therefore, it is the most viscous of these liquids. U asy asy edium edium ediumard ediumard ediumard edium 0 ρ ρ.98 h = =.5 =. h = 60 mm 40 mm where ρ is density and h is height ρ ard cience ractice uestions aper

12 evel of difficulty refers to the expected level of difficulty for the question. asy edium ediumard ard more than 70% of candidates will choose the correct option. about 5070% of candidates will choose the correct option. about 050% of candidates will choose the correct option. less than 0% of candidates will choose the correct option. cience ractice uestions aper

PAPER. Practice Questions. Mathematics. International Competitions and Assessments for Schools STUDENT S NAME:

PAPER. Practice Questions. Mathematics. International Competitions and Assessments for Schools STUDENT S NAME: ractice uestions nternational ompetitions and ssessments for chools U U. U : ead the instructions on the and fill in your, and. Use a or pencil. o use a pen. ub out any mistakes completely. ou U record