[PDF] 2019 Reach and ICAS Practice Questions Science Paper G.pdf | Plain Text

Science DO NOT OPEN THIS BOOKLET UNTIL INSTRUCTED. PRACTICE QUESTIONS PA PE R G Read the instructions on the ANSWER SHEET and fill in your NAME , SCHOOL and OTHER INFORMATION . Use a pencil. Do NOT use a coloured pencil or a pen. Rub out any mistakes completely. Yo u MUST record your answers on the ANSWER SHEET . Mark only ONE answer for each question. Your score will be the number of correct answers. Marks are NOT deducted for incorrect answers . Use the information provided to choose the BEST answer from the four possible options. On your ANSWER SHEET fill in the oval that matches your answer . You may use a calculator and a ruler. DO NOT OPEN THIS BOOKLET UNTIL INSTRUCTED. Note : Some UNSW Global assessments are only available online.

© UNSW Global Pty Limited 2 1. 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 colour yellow? Are strong metallic lines present in the spectrum? M Class All stars yes K Class yes no no yes Are titanium oxide lines present? A Class no yes Are strong hydrogen lines present? Is the surface temperature greater than 6 000 C? Is the surface temperature greater than 30 000 C? 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 © UNSW Global Pty Limited 2. 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. Petri Dish Experimental Conditio nIIIIII IV V Amount of growth medium in dish (mL) 10 15102015 T ype of antibiotic added to dish X X YX Y Amount of antibiotic added to dish (mL) 32222 T emperatur e at which dish is kept (�C) 30 25303025 Substance Density (g/cm 3) Solubility in water (g/100 mL) Reaction to hydrochloric acid caesium carbonat e 4.0 2.6 � 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 3. A scientist wanted to investigate the effects of two types of antibiotics, X and Y, on the growth of the bacterium, E. coli. He grew five cultures of the bacterium in a growth medium placed on separate Petri dishes like the one shown. Petri Dish Experimental Conditio nIIIIII IV V Amount of growth medium in dish (mL) 10 15102015 T ype of antibiotic added to dish X X YX Y Amount of antibiotic added to dish (mL) 32222 T emperatur e at which dish is kept (�C) 30 25303025 Substance Density (g/cm 3) Solubility in water (g/100 mL) Reaction to hydrochloric acid caesium carbonat e 4.0 2.6 � 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 Information about the preparation of the five dishes is shown in the table. Petri Dish Experimental Conditio nIIIIII IV V Amount of growth medium in dish (mL) 10 15102015 T ype of antibiotic added to dish X X YX Y Amount of antibiotic added to dish (mL) 32222 T emperatur e at which dish is kept (�C) 30 25303025 Substance Density (g/cm 3) Solubility in water (g/100 mL) Reaction to hydrochloric acid caesium carbonat e 4.0 2.6 � 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 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

© UNSW Global Pty Limited 4 4. Serial dilution is a procedure used to make a very dilute solution. The procedure for diluting a solution of copper sulfate is shown. 1 mL1 mL1 mL (10 mL) copper sulfate A student estimated that there were 1 000 000 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 © UNSW Global Pty Limited 5. 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. 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. Which points are the student’s results? (A) 4 and 5 (B) 5 and 6 (C) 6 and 7 (D) 7 and 8 END OF PAPER

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Print your details clearly in the boxes provided. Make sure you fill in only one oval in each column. Rub out all mistakes completely. Do not use a coloured pencil or pen. HOW TO FILL OUT THIS SH\ EET: USE A PENCIL FIRST NAME to appear on certifi\icate LAST NAME to appear on certifi\icate A A A A A A A A A A A A A A A A A A A B B B B B B B B B B B B B B B B B B B C C C C C C C C C C C C C C C C C C C D D D D D D D D D D D D D D D D D D D E E E E E E E E E E E E E E E E E E E F F F F F F F F F F F F F F F F F F F G G G G G G G G G G G G G G G G G G G H H H H H H H H H H H H H H H H H H H I I I I I I I I I I I I I I I I I I I J J J J J J J J J J J J J J J J J J J K K K K K K K K K K K K K K K K K K K L L L L L L L L L L L L L L L L L L L M M M M M M M M M M M M M M M M M M M N N N N N N N N N N N N N N N N N N N O O O O O O O O O O O O O O O O O O O P P P P P P P P P P P P P P P P P P P Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q R R R R R R R R R R R R R R R R R R R S S S S S S S S S S S S S S S S S S S T T T T T T T T T T T T T T T T T T T U U U U U U U U U U U U U U U U U U U V V V V V V V V V V V V V V V V V V V W W W W W W W W W W W W W W W W W W W X X X X X X X X X X X X X X X X X X X Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ – – – – – – – – – – – – – – – – – – – / / / / / / / / / / / / / / / / / / / DATE OF BIRTH STUDENT IDCLASS DayMonth \bear (optional) (optional) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 A K 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 B L 2 2 2 2 2 2 2 2 2 2 2 2 2 2 C M 3 3 3 3 3 3 3 3 3 3 3 3 3 3 D N 4 4 4 4 4 4 4 4 4 4 4 4 4 E O 5 5 5 5 5 5 5 5 5 5 5 5 5 F P 6 6 6 6 6 6 6 6 6 6 6 6 6 G Q 7 7 7 7 7 7 7 7 7 7 7 7 7 H R 8 8 8 8 8 8 8 8 8 8 8 8 8 I S 9 9 9 9 9 9 9 9 9 9 9 9 9 J T A A A A A A A A A A A A A A A A A A A A A A A A B B B B B B B B B B B B B B B B B B B B B B B B C C C C C C C C C C C C C C C C C C C C C C C C D D D D D D D D D D D D D D D D D D D D D D D D E E E E E E E E E E E E E E E E E E E E E E E E F F F F F F F F F F F F F F F F F F F F F F F F G G G G G G G G G G G G G G G G G G G G G G G G H H H H H H H H H H H H H H H H H H H H H H H H I I I I I I I I I I I I I I I I I I I I I I I I J J J J J J J J J J J J J J J J J J J J J J J J K K K K K K K K K K K K K K K K K K K K K K K K L L L L L L L L L L L L L L L L L L L L L L L L M M M M M M M M M M M M M M M M M M M M M M M M N N N N N N N N N N N N N N N N N N N N N N N N O O O O O O O O O O O O O O O O O O O O O O O O P P P P P P P P P P P P P P P P P P P P P P P P Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q R R R R R R R R R R R R R R R R R R R R R R R R S S S S S S S S S S S S S S S S S S S S S S S S T T T T T T T T T T T T T T T T T T T T T T T T U U U U U U U U U U U U U U U U U U U U U U U U V V V V V V V V V V V V V V V V V V V V V V V V W W W W W W W W W W W W W W W W W W W W W W W W X X X X X X X X X X X X X X X X X X X X X X X X Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ – – – – – – – – – – – – – – – – – – – – – – – – / / / / / / / / / / / / / / / / / / / / / / / / Are you male or fema\Mle? Male Female Does anyone in your h\Mome usually speak a language othe\Mr than English? \be s No School name: Town / suburb: Today’s date: / / Postcode: PAPER EXAMPLE 1: Debbie Bach FIRST NAME LAST NAME ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD EEEE EEE EE EEE EXAMPLE 3: Jamal bin Abas FIRST NAME LAST NAME ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD EEEEEE EEE EEEE EXAMPLE 2: Chan Ai Beng FIRST NAME LAST NAME ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD ABCD EE EEE EEEEE EEE S SAMPLE PA PE R G *201909*

TO ANSWER THE QUESTIONS Example: 1 A B C D 2 A B C D 3 A B C D 4 A B C D 5 A B C D START Ari added cordial to water to make a jug of drink. What will be the volume of the drink in the jug? (A) 50 mL (B) 150 mL (C) 200 mL (D) 250 mL The answer is 250 mL, so you would fill in the oval D, as shown. D C B A USE A PENCIL \bO NOT USE A COLOURE\b PENCIL OR PEN S TO ANS For details on how \mwe handle your personal information, please see our Privacy Policy on our we\bsite at unswglobal.unsw.edu.au PA PE R G

9 © UNSW Global Pty Limited TO ANSWER THE QUESTIONS Example: 1 A B C D 2 A B C D 3 A B C D 4 A B C D 5 A B C D START Ari added cordial to water to make a jug of drink. What will be the volume of the drink in the jug? (A) 50 mL (B) 150 mL (C) 200 mL (D) 250 mL The answer is 250 mL, so you would fill in the oval D, as shown. D C B A USE A PENCIL \bO NOT USE A COLOURE\b PENCIL OR PEN S SAMPLE For details on how \mwe handle your personal information, please see our Privacy Policy on our we\bsite at unswglobal.unsw.edu.au PA PE R G \ ICAS Science Practice Questions Paper G © EAA QUESTION KEYKEY REASONING LEVEL OF DIFFICUL TY 1 ASirius does not have str ong metallic lines but has str ong hydrogen lines. The temperatur e is irrelevant to this question. Easy 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 2 CIn or der to X -ray the digestive system, it is necessary to swallow a dense  and very insoluble substance. F rom 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 r eact with hydrochloric acid, so answers  A and B ar e wrong. Magnesium sulfate is less dense and mor e soluble than  barium sulfate, so D is wr ong. Medium 3 BT o compar e the effect of the two types of antibiotics on the gr owth of  bacterium, E. coli, the scientist needs to mak e sure that all other possible variables wer e kept the same e xcept for the antibiotic used. This only happens in petri dishes II and V . Medium m m 4 0 m m 6 0 h h 5 . 1 3 2 . 1 9 8 . 1 1 2 2 1 = = = = ρ ρ 13 8 . 12 82 1050 ≈ = 4 BEach dilution r educes the concentration by a factor of 10. Ther efore to r educe 1 000 000 to 100 we have to divide 1 000 000 four times by 10. Medium/Har d 5 CR esults ar e ‘observations’ made using our five senses, particularly sight. W e can see the marbles above the jars at time = 0 s, and we can see the jar\ s with the marbles in them at t = 1 s, at differ ent positions within the liquids. So point 6 and point 7 of the r eport are observations. Note that which liquid is the most or least viscous is an infer ence which is based on observations. It itself is not an observation. Medium/Har d . LEGEND Level of difficulty r efers to the expected level of difficulty for the question. Easy more than 70% of candidates will choose the cor rect option. Medium about 50–70% of candidates will choose the cor rect option. Medium/Har d about 30–50% of candidates will choose the cor rect option. Har d less than 30% of candidates will choose the cor rect option.

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