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

Science PRACTICE QUESTIONS PA PE R H 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 Forquestions 1 and 2 use the information below. The key distinguishes between types of supernova according to the light \ they emit. 1. Does the spectrum contain hydrogen lines ? Y es go to 4 No go to 2 2. Does the spectrum contain silicon lines ? Y es T ype 1a No go to 3 3. Does the spectrum contain helium lines? Yes T ype 1b No T ype 1c 4. Are helium line s dominan t in the spectrum? Yes T ype 2b No go to 5 5. Does the light curve decay linearly after peak brightness? Yes T ype 2l No T ype 2p Hydrogen line sHelium line s Silicon lines (A) present absentpresent (B) absent absentabsent (C) present presentpresent (D) absent present absent 1. A supernova shows both hydrogen and helium lines in its spectrum but the helium lines are much stronger than the hydrogen lines. What type of supernova is it? (A) Type 1b (B) Type 2b (C) Type 2l (D) Type 2p 2. Which description best fits the spectrum of a Type 1c supernova? 1. Does the spectrum contain hydrogen lines ? Y es go to 4 No go to 2 2. Does the spectrum contain silicon lines ? Y es T ype 1a No go to 3 3. Does the spectrum contain helium lines? Yes T ype 1b No T ype 1c 4. Are helium line s dominan t in the spectrum? Yes T ype 2b No go to 5 5. Does the light curve decay linearly after peak brightness? Yes T ype 2l No T ype 2p Hydrogen line sHelium line s Silicon lines (A) present absentpresent (B) absent absentabsent (C) present presentpresent (D) absent present absent

3 © UNSW Global Pty Limited 3. In general, solvents with the lowest boiling points release the most vapour into the air. Flammable solvents can explode if a spark or flame is present. The table gives facts about some commonly used solvents. The solvents listed can all enter the body through the lungs or skin or by swallowing. Name Boiling Point ( C)Flammability Toxicity Solubility in water Carcinogenic acetone 57high lowvery soluble no acetic acid 118 low nonflammable nonflammable low very soluble no carbon tetrachloride 77 mediuminsoluble probably chloroform 61 highinsoluble probably ethanol 79high lowvery soluble yes, heavy drinkers only ether 35very high mediumslightly soluble no methanol 65high highvery soluble no Methanol is used as a fuel in motor racing. People fuelling cars with me\ thanol have been known to spill a large amount of fuel on themselves and catch alight. Which option describes the best way of dealing with the fire and removing the methanol? (A) Allow the methanol to burn away then use the fire blanket. (B) Spray the person with carbon tetrachloride. (C) Hose the person with cold water. (D) Wrap the person in an airproof fire blanket.

© UNSW Global Pty Limited 4 4. In forensic science, blood alcohol content is tested at the time of sampling and, if challenged in court, from a stored sample. A student wanted to know how the tightness of the lid of a screw-topped c\ ontainer affected the loss of alcohol over time. He assumed alcohol behaved the same way in blood and \ water. He partially filled three containers with equal quantities of 0.1 g L–1 alcohol solution. He then tightened the lids as follows. • loose lid - tighten until resistance is experienced then turn lid back 1 mm. • firm lid - tighten until resistance is just experienced. • tight lid - tighten until resistance is just experienced then turn a further 1 mm forward. The solutions were then stored in a storage cabinet at 30 °C for a number of weeks. His results are shown in the graph. 0.12 0.10 0.08 0.06 0.04 0.02 0 Week 0 Week 1 Week 3 Week 5 Week 7 Standing time Alcohol concentration (g L –1) loose firm tight KEY By how many grams per litre has the concentration dropped after three we\ eks in the container with the tight lid? (A) 0.005 (B) 0.01 (C) 0.09 (D) 0.095

5 © UNSW Global Pty Limited 5. Acceleration due to gravity is different on different planets. It depends on the mass and the radius of the planet, as shown in the formula. g = G m r 2 (A) four times larger twice as large (B) half as large half as large (C) one quarter as larg eequal (D) twice as large four times as large KEY g is the acceleration of an object due to the planet’ s gravity G is a constant m is the mass of the planet r is the radius of the planet Planet Mass compared to Earth Radius compared to Earth Mercury 0.055 0.38 V enus 0.86 0.95 Earth 1.0 1.0 Mars 0.11 0.53 The table below shows the mass and radius of some planets compared to Ea\ rth. g = G m r 2 (A) four times larger twice as large (B) half as large half as large (C) one quarter as larg eequal (D) twice as large four times as large KEY g is the acceleration of an object due to the planet’ s gravity G is a constant m is the mass of the planet r is the radius of the planet Planet Mass compared to Earth Radius compared to Earth Mercury 0.055 0.38 V enus 0.86 0.95 Earth 1.0 1.0 Mars 0.11 0.53 Which planet has the smallest acceleration due to gravity on the surface\ ? (A) Mercury (B) Venus (C) Earth (D) Mars 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 H *201910*

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 H

9 © UNSW Global Pty Limited TO ANSWER THE QUESTIONS Example: 1 A B C a 2 A B C a 3 A B C a 4 A B C a 5 A B C a 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 a, as shown. a 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 H \ ICAS Science Practice Questions Paper H © EAA QUESTION KEY KEY REASONING LEVEL OF DIFFICULTY 1B Start at the top, number 1. The supernova has hydrogen lines, go to number 4. It has dominant helium lines therefore it is Type 2b. Easy 2B In the key, work backwards from Type 1c, starting from number 3. The supernova does not have helium lines in number 3 (so C and D are wrong). At number 2, Type 1c didn’t have silicon lines in order to get to number 3 (so A and C are wrong). Finally, at number 1, Type 1c didn’t have hydrogen lines in order to get to number 2 (so A and C are wrong). Easy 3C Methanol is water soluble, thus removing the highly toxic chemical, would cool the person’s burns, thus reducing the severity of any burns, and cool the flames, thus putting out the fire. Carbon tetrachloride is a chemical that will probably cause cancers and is also moderately toxic so should not be used to spray on people. Therefore B is wrong. Methanol is highly toxic so wrapping the spilt methanol with the person in a fire blanket would not be recommended, so D is wrong. Medium 4A The tight column in the graph shows that after three weeks the concentration in the tight lidded container dropped from 0.10 gL -1 to approximately 0.095 gL -1 which is a difference of 0.005 gL -1. Please note that the question asks for the difference after three weeks and not seven weeks. Hard 5Ar y, where 22r4 1 (2r) 1 since gra vity, s Earth' 4 1 = 2 2 E E Es/cm980 r m g =         α () 2 2 E E 2 2 E Es/cm373 r m 3 8. 0 055.0 r3 8 . 0 m055.0 g = = = () 2 2 E E 2 2 E Es/cm934 r m 9 5. 0 8 6. 0 r9 5 . 0 m8 6 . 0 g = = = () 2 2 E E 2 2 E Es/cm384 r m 5 3. 0 1 1. 0 r5 3 . 0 m1 1 . 0 g = = = = 9.8m/s 2: Mercury: () 2 E E 2 2 Er m m 3 8. 0 055.0 r3 8 . 0 Em055.0 g =         = = Venus: () 2 E E 2 2r9 5 . 0 r9 5 . 0 8 6. 0 g = Mars: Medium Calculations – compa ed to Earth’s gravit E 0.86 = m () 2 E E 2 2r.530 r5 3 . 0 1 1. 0 g = E 0.11 3.7m/s 2 9.3m/s 2 3.8m/s 2 = = = 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. Em Em

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