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G PAPER DO NOT OPEN THIS BOOKLET UNTIL INSTRUCTED. STUDENT’S NAME: Read the instructions on the ANSWER SHEET and fill in your NAME, SCHOOL and OTHER IN\bORMATION. Use a 2B or B pencil. Do NOT use a pen. Ru\b out any mistakes completely. You MUST record your answers on the ANSWER SHEET. SCIENCE Mark only ONE answer for each question. Your score will \be the num\ber of correct answers. Marks are NOT deducted for incorrect answers. Use the information provided to choose the BEST answer from the four possi\ble options. On your ANSWER SHEET fill in the oval that matches your answer. You may use a calculator and a ruler. I n t e r n a t i o n a l C o m p e t i t i o n s and Assessments for Schools Practice Q uestions

ICAS Science Practice Questions Paper G © EAA 2 For questions 1 and 2 use the information below. The flow chart distinguishes between some classes of stars. F Class O Class G Class B Class no yes yes no no Is the spectral col\rour yellow? Are stron\b metallic \rlines present in the spec\rtrum? M Class All stars yes K Class yes no no yes Are titanium oxide l\rines present? A  Class no yes Are stron\b hydro\ben  lines present? Is the surface temp\rerature \breater than 6  000  C? Is the surface temp\rerature \breater than 30  000  C? 1. The Sun is a G Class star. What are some characteristics of the Sun? (A) titanium oxide and strong hydrogen emission lines present, surface temperature greater than 6 000 °C (B) strong metallic lines present, surface temperature greater than 6 000 °C (C) strong metallic lines present, spectral colour yellow (D) strong titanium oxide lines present, spectral colour yellow 2. Sirius is a white star which has a surface temperature of 10 000 °C. Its spectrum has hydrogen but no strong metallic lines. What class of star is Sirius? (A) A Class (B) B Class (C) F Class (D) O Class

3 ICAS Science Practice Questions Paper G © EAA 3. The table compares the tensile strength of some common materials. Material Tensile strength (MN/m 2) muscle cartilage house brick tendon bone (elderly) bone (young adult) glass nylon thread 0.1 3 7 82 85 110 175 1 050 Approximately how many times stronger is nylon thread than tendon? (A) 0.08 (B) 13 (C) 82 (D) 1 050 4. In order to X-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. Information about some substances is given in the table. Substance Density (g/cm 3) Solubility in water (g/100 mL) Reaction to hydrochloric acid caesium carbonate 4.02.6 × 10 17 reacts to form carbon dioxide iron(III) hydroxide 3.99.9 × 10 –18 reacts to form iron (III) chloride barium sulfate 4.52.5 × 10 –4 does not react magnesium sulfate 2.73.6 ×10 1 does not react Which substance shown would be most suitable for use when X–raying the digestive system? (A) caesium carbonate (B) iron(III) hydroxide (C) barium sulfate (D) magnesium sulfate

ICAS Science Practice Questions Paper G © EAA 4 5. A scientist wanted to investigate the effects of two types of antibiotics, X and Y, on the growth of a bacterium, E. coli. He grew five cultures of the bacterium in a growth medium placed on separate Petri dishes like the one shown. Information about the preparation of the five dishes is shown in the table. Petri Dish Experimental Condition IIIIII IV V Amount of growth medium in dish (mL) 10 15102015 Type of antibiotic added to dish X X YX Y Amount of antibiotic added to dish (mL) 3 2222 Temperature at which dish is kept (°C) 30 25303025 Which two dishes should he use to compare the effects of X and Y on the growth of the bacteria? (A) I and III (B) II and V (C) III and IV (D) IV and V For questions 6 and 7 use the information below. Serial dilution is a procedure used to make a very dilute solution. The procedure for diluting a solution of copper sulfate is shown. 1 ml 1 ml1 ml (10 mL) 6. How many times more concentrated is the initial solution than the solution in tube 4? (A) 101000 times (B) 11000 times (C) 100 times (D) 10 times 7. A student estimated that there were 1 10001 000 particles of the dissolved substance in the initial solution. How many dilutions would she have to perform to obtain a solution with approximately 100 particles of the dissolved substance? (A) 3 (B) 4 (C) 5 (D) 6

5 ICAS Science Practice Questions Paper G © EAA For questions 8 and 9 use the information below. Reports 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 A student wrote a report containing a number of points. honey time = 0 seconds time = 1 second oil water honey oilwater 1)   "Which liquid is th\ue most viscous\b" 2)  The viscosity of th\ue liquid is how "th\uick" it is.  The more viscous the\u liquid, the slower\u the marble    will pass through it\u . 3)  To determine the most \uviscous: honey , oil or water. 4)  Set up three identic\ual jars filled with\u the dif ferent liquids. 5)  Drop a marble in eac\uh jar at the same t\uime and record the m\uarble's position af\uter one second. 6) 7)  The marble in the h\uoney was near the \utop of the jar whil\ue the marble in the\u water   was at the bottom o\uf the jar . 8)  Water was the most vi\uscous liquid tested.\u   Conclusion correct?\R                    \R              Reaso\Rn (A)  no  The marble went thr\uough the water the \uslowest. (B)  yes  The marble went thr\uough the water the \uslowest . (C)  yes  The marble went thr\uough the honey the \uslowest . (D)  no  The marble went thr\uough the honey the \uslowest . 8. Which points are the student’s results? (A) 4 and 5 (B) 5 and 6 (C) 6 and 7 (D) 7 and 8 9. Was the student’s conclusion correct? Why? Conclusion correct? Reason (A) noThe marble went through the water the slowest. (B) yesThe marble went through the water the slowest. (C) yesThe marble went through the honey the slowest. (D) noThe marble went through the honey the slowest.

ICAS Science Practice Questions Paper G © EAA 6 10. Hare’s apparatus is used to compare the densities of two liquids. liquid 1 vacuum pump switched on liquid 2 Height of dichloro\Smethane (mm) 40 60 \b0 110 = (A) (B) (C) (D) Height of trichlor\Somethane (mm) 60 40 110 \b0 clip open Step 1 Step 2 liquid 1 height 1 clip closed after air is drawn out liquid 2 height 2 densit\b (liquid 1) densit\b (liquid 2) height (liquid 2) height (liquid 1) The height that the liquids rise can be calculated from: liquid 1 vacuum pump switched on liquid 2 Height of dichloro\Smethane (mm) 40 60 \b0 110 = (A) (B) (C) (D) Height of trichlor\Somethane (mm) 60 40 110 \b0 clip open Step 1 Step 2 liquid 1 height 1 clip closed after air is drawn out liquid 2 height 2 densit\b (liquid 1) densit\b (liquid 2) height (liquid 2) height (liquid 1) A student performed an experiment with Hare’s apparatus using dichloromethane (density 1.32 g/cm 3) and trichloromethane (density 1.98 g/cm 3). Which of the following could be the height each liquid rose in the tube? Height of dichloromethane (mm) Height of trichloromethane (mm) (A) 40 60 (B) 60 40 (C) 90 110 (D) 110 90

ICAS Science Practice Questions Paper G © EAA 7 THIS PAgE MAy bE uSED FoR woRkINg.

G PAPER The following year levels should sit T\bIS Paper: Australia Year 9 Brunei Form 4 \bong Kong Form 3 Indonesia Year 10 Malaysia Form 3 New Zealand Year 10 Pacific Year 9 Singapore Secondary 2 South Africa Grade 9 THE UNIVERSITY OF \ NEW SOUTH WALES Educational Assessment Australia eaa.unsw.edu.au © 2010 Educational Assessment Australia. EAA is an education \broup of UNSW Global Pty Limited, a not-for-profit provider of education, trainin\b and consultin\b services and a wholly owned enterprise of the University of New South Wales. ABN 62 086 418 582 Acknowledgment Copyri\bht in this booklet is owned by Educational Assessment Australia, UNSW Global Pty Limited, unless otherwise indicated. Every effort has been made to trace and acknowled\be copyri\bht. Educational Assessment Australia apolo\bises for any accidental infrin\bement and welcomes information to redress the situation.

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ICAS Science Practice Questions Paper G © EAA QUESTIONKEYKEY rEa SONINg LEVEL OF DIFFICULTY 1 CWorking backwards from G Class: the Sun is spectral colour yellow, has a surface temperature < 6000 °C (so A and B are wrong), does not have titanium oxide lines (so A and D are wrong) but it does have strong metallic lines present in the spectrum. Easy 2 ASirius does not have strong metallic lines but has strong hydrogen lines. The temperature is irrelevant to this question. Easy 3 B mm 4 0 m m 6 0 h h 5 . 1 3 2 . 1 9 8 . 1 1 2 2 1 = = = = ρ ρ       mL 1 0m L 1 o r m L 1 0 i n m L 1 13 8 . 12 82 1050 ≈ = Easy 4 CIn order to X-ray the digestive system, it is necessary to swallow a dense and very insoluble substance. From the table, barium sulfate has the highest density and lowest solubility; it also does not react with hydrochloric acid. Only the last two chemicals do not react with hydrochloric acid, so answers A and B are wrong. Magnesium sulfate is less dense and more soluble than barium sulfate, so D is wrong. Medium 5 BTo compare the effect of the two types of antibiotics on the growth of bacterium, E. coli, the scientist needs to make sure that all other possible variables were kept the same except for the antibiotic used. This only happens in petri dishes II and V. Medium 6 BEach test tube changes by a factor of 10 m m 4 0 m m 6 0 h h 5 . 1 3 2 . 1 9 8 . 1 1 2 2 1 = = = = ρ ρ       mL 1 0m L 1 o r m L 1 0 i n m L 1 13 8 . 12 82 1050 ≈ = . Tube 3 is 10 times more concentrated than tube 4. Tube 2 is 100 times more concentrated that tube 4 while tube 1 is 1000 times more concentrated than tube 4. Medium/Hard 7 BEach dilution reduces the concentration by a factor of 10. Therefore to reduce 1 000 000 to 100 we have to divide 1 000 000 four times by 10. Medium/Hard 8 CResults are ‘observations’ made using our five senses, particularly sight. We can see the marbles above the jars at time = 0 s, and we can see the jars with the marbles in them at t = 1 s, at different positions within the liquids. So point 6 and point 7 of the report are observations. Note that which liquid is the most or least viscous is an inference which is based on observations. It itself is not an observation. Medium/Hard 9 DThe more viscous the liquid, the slower the marble will pass though it. After 1 s the slowest marble will have moved the smallest distance. This occurs in honey; therefore, it is the most viscous of these liquids. Medium 10 B mm 4 0 m m 6 0 h h 5 . 1 3 2 . 1 9 8 . 1 1 2 2 1 = = = = ρ ρ       mL 1 0m L 1 o r m L 1 0 i n m L 1 13 8 . 12 82 1050 ≈ = where m m 4 0 m m 6 0 h h 5 . 1 3 2 . 1 9 8 . 1 1 2 2 1 = = = = ρ ρ       mL 1 0m L 1 o r m L 1 0 i n m L 1 13 8 . 12 82 1050 ≈ = is density and h is height Hard

ICAS Science Practice Questions Paper G © EAA LEgEND Level of difficulty refers to the expected level of difficulty for the question. Easy more than 70% of candidates will choose the correct option. Medium about 50–70% of candidates will choose the correct option. Medium/Hard about 30–50% of candidates will choose the correct option. Hard less than 30% of candidates will choose the correct option.