PAPER J PRACTICE QUESTIONS - bettereducation.com.au...In forensic science, blood alcohol content is tested at the time of sampling and, if challenged in court, from a ... Day Month

Science

PRACTICE QUESTIONS

PAPER

JRead 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.

You 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.

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1. The two graphs below show what scientists believe were the concentrations of nitrogen and carbon dioxide in the atmosphere between 4 500 million and 2 000 million years ago.

4500 4000 3500 3000 2500 2000Time (millions of years ago)

4500 4000 3500 3000 2500 2000 1500Time (millions of years ago)

atm

osph

ere

(%)

0

20

40

60

80

Car

bon

diox

ide

in E

arth

’sat

mos

pher

e (%

)

0

20

40

60

80

Nitr

ogen

in E

arth

’s

There was a time in history when carbon dioxide and nitrogen were present in equal percentages in the atmosphere.

At what time did this occur?

(A) 2 000 million years ago (B) 3 500 million years ago(C) 4 200 million years ago (D) 4 500 million years ago

3 © UNSW Global Pty Limited

2. Some molecules are mirror images of each other. They cannot be rotated or moved so that one molecule can be superimposed on the other.

The models of molecules shown are mirror images of each other.

(B) (C) (D)

(B) (C) (D)

(A) (B) (C) (D)

Here is a model of a molecule of 1-iodoethanol.

(B) (C) (D)

(B) (C) (D)

(A) (B) (C) (D)

Which model of a molecule below is a mirror image of the one above?

(B) (C) (D)

(B) (C) (D)

(A) (B) (C) (D)


Forquestions 3 and 4 use the information below.

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 container 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

0Week 0 Week 1 Week 3 Week 5 Week 7

Standing time

Alc

ohol

con

cent

ratio

n (g

L–1

)

loosefirmtight

KEY

3. By how many grams per litre has the concentration dropped after three weeks in the container with the tight lid?

(A) 0.005(B) 0.01(C) 0.09(D) 0.095

4. Which hypothesis best applies to this experiment?

(A) Blood reacts with alcohol over time.(B) Blood kept in sealed containers should not be used in court.(C) Changes in blood alcohol concentration are due to lid tightness.(D) Changes in temperature affect blood alcohol concentration.


5. When a solvent in a mixture evaporates, any dissolved solids are left behind.

The Soxhlet extractor works very well to extract chlorophyll from leaves using a flammable solvent.

There are seven steps in the process.

1. The leaves are placed in a sieve.

2. The solvent evaporates and passes through the bypass sidearm.

3. The solvent vapour enters the condenser.

4. The condenser liquefies the solvent.

5. The solvent drops into the sieve and dissolves chlorophyll from the leaves.

6. When the liquid fills up to the top of the reflux sidearm, it is all siphoned back in the flask.

7. Solvent and chlorophyll collect in the flask.

The process repeats from step 2 until the apparatus is switched off.

Which of the following statements explains the purpose of this Soxhlet extractor?

(A) Poisonous or flammable solvents can be used safely.(B) The extracting solvent can be heated up to near boiling point.(C) The solvent can be constantly purified before re-use.(D) Chlorophyll can be continuously extracted and concentrated.

END OF PAPER

water out

bypass sidearm

flask

condenser

water in

solvent

reflux sidearmsieve

solvent + chlorophyll

heat source


THIS PAGE IS MEANT TO BE BLANK

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 SHEET:USE A PENCIL

FIRST NAME to appear on certificate LAST NAME to appear on certificate

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

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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

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Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z

’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’– – – – – – – – – – – – – – – – – – –

/ / / / / / / / / / / / / / / / / / /

DATE OF BIRTH STUDENT ID CLASS

Day Month Year(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

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7 7 7 7 7 7 7 7 7 7 7 7 7 H R

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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 female? Male Female

Does anyone in your home usually speak a language other than English? Yes No

School name:

Town / suburb:

Today’s date: / / Postcode:

PAPER

EXAMPLE 1: Debbie BachFIRST NAME LAST NAME

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EXAMPLE 3: Jamal bin AbasFIRST NAME LAST NAME

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EXAMPLE 2: Chan Ai BengFIRST NAME LAST NAME

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PAPER

J*201912*

TO ANSWER THE QUESTIONSExample:

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.

DCBA

USE A PENCILDO NOT USE A COLOURED PENCIL OR PEN

S

SAMP

LE

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PAPER

J


TO ANSWER THE QUESTIONSExample:

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.

DCBA

USE A PENCILDO NOT USE A COLOURED PENCIL OR PEN

S

SAMP

LE

For details on how we handle your personal information, please see our Privacy Policy on our website at unswglobal.unsw.edu.au

PAPER

J ICAS Science Practice Questions Paper I © EAA

QUESTION KEY KEY REASONING LEVEL OF DIFFICULTY

1 C If the graphs are plotted on the same set of axes, they will cross at approximately 4 300 million years ago Easy

2 D

A is identical to the original, so A is wrong. B is the same as A but it is has been flipped and rotated, so B is wrong. C is the same as B but has been further rotated, so C is wrong. Models A, B and C are all (1R)-1-iodoethanol. Compare D and the original; the blue atom is in a different position. D is a different chemical, and is called (1S)-1-iodoethanol. These are optical isomers.

Easy

3 A

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.

Medium/Hard

4 C In the experiment the tightness of the lid has been altered (loose, firm, and tight) and change in alcohol concentration was measured. Easy

5 C Hard

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.

Because solvent is continuously entering the sieve dissolving any chlorophyllremaining in leaves, the maximum amount of chlorophyll will be extracted from the leaves and concentrated in the flask.

© 2019 Copyright. Copyright in this publication is owned by UNSW Global Pty Limited, unless otherwise indicated or licensed from a third party. This publication and associated testing materials and products may not be reproduced, published or sold, in whole or part, in any medium, without the permission of UNSW Global Pty Limited or relevant copyright owner.

1 All international schools registered with UNSW Global (which have an 8-digit school code starting with 46) should sit the papers according to the Australian year levels.

2 Indian Subcontinent Region: India, Sri Lanka, Nepal, Bhutan and Bangladesh.

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4 Pacific Region: Vanuatu, Papua New Guinea and Fiji.5 Southern Africa Region: South Africa, Botswana, Lesotho, Swaziland,

Zimbabwe and Namibia.

PAPER

JTHE FOLLOWING YEAR LEVELS SHOULD SIT THIS PAPER

Australia1 Year 12

Brunei Pre-University 2

Egypt Year 12

Hong Kong Form 6

Indian Subcontinent2 Class 12

Indonesia N/A

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Middle East3 Class 12

New Zealand/ Pacific4 Year 13

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PAPER J PRACTICE QUESTIONS - bettereducation.com.au...In forensic science, blood alcohol content is tested at the time of sampling and, if challenged in court, from a ... Day Month