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COMBINED SCIENCE B

OCR 2024
GCSE Combined Science B Twenty First Century Science
J260/04: Combined Science (Foundation Tier)

with Marking Scheme Merged
...
Do not write in the barcodes
...
You can use an HB pencil, but only for graphs and diagrams
...
If you need extra space use the
lined pages at the end of this booklet
...

• Answer all the questions
...
Marks might
be given for using a correct method, even if your answer is wrong
...

• The marks for each question are shown in brackets [ ]
...

• This document has 28 pages
...


© OCR 2024 [601/8690/2]
DC (SL/FC) 342915/3

OCR is an exempt Charity

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2
1

A student is investigating the rate of reaction between hydrochloric acid (HCl ) and
calcium carbonate powder (CaCO3)
...


(a)
(i) What is the name of this piece of equipment?

Tick (✓) one box
...

Beaker
Conical flask
Delivery tube
Measuring cylinder
[1]
(b) Suggest one safety precaution the student should take when working with acid
...


...

Draw one line from the gas collected to the chemical test that can identify the gas
...

Carbon dioxide

Hydrogen

Turns universal indicator blue

Oxygen

Turns lime water cloudy when
it is bubbled through
...

(i)

Explain why the rate of reaction increases when the concentration of the hydrochloric acid
increases
...


...


...
[2]

(ii) The student wants to ensure that the data they collect is valid
...

1
...

[2]

© OCR 2024

5
BLANK PAGE

PLEASE DO NOT WRITE ON THIS PAGE

Turn over for the next question

© OCR 2024

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6
2

Cardiovascular disease (CVD) is a disease that affects the heart and circulatory system
...
2
...

Fig
...
1
3

2
Relative
effect
1

0
High blood
pressure

Smoking

Diabetes

High
blood
cholesterol

Obesity

Lack of
exercise

Risk factor
(a) State the risk factor that has the highest relative effect
...
[1]

(b) Charlie is having a health check-up at the doctor’s
...


State Charlie’s two biggest risk factors for CVD
...
2
...

1
...

[2]
© OCR 2024

7
(c) Suggest one other health-related question the doctor should ask Charlie to help determine her
risk of developing CVD
...


...
Charlie has been told she can treat her CVD by changing her
lifestyle or using medicines
...



...


...


...


...


...


...
[6]

© OCR 2024

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8
(e) Surgery can be used to help people who have developed CVD
...
2
...

Fig
...
2
100 000
90 000

Stent procedures

80 000
70 000
60 000

Number
of
procedures

50 000

per year

40 000
30 000

Coronary artery bypasses
Heart bypass

20 000
10 000
0
2013
201
1

2009

2007

2005
200
3

2001

1999

1997

1995

1993

1991

1989

1987

1985

1983

1981

Year

(i)

What year were stent procedures introduced?

...


...


...
[2]

© OCR 2024

9
BLANK PAGE

PLEASE DO NOT WRITE ON THIS PAGE

Turn over for the next question

© OCR 2024

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10
3

The picture shows a TV and its remote control
...

(a) Complete the sentences about the remote control
...

absorbed

electromagnetic

sensor

sound

source

transmitted

When a button is pressed,
...


,

where it is
...

Current (A)

0
...
0

Calculate the power of the remote control
...


Power =
...

Electrical power is transmitted through the national grid transmission cables at high voltages
...

Current in
cables

More efficient because

Decreased

Less heating

Decreased

More heating

Increased

Less heating

Increased

More heating
[1]

(d) The TV has a power rating of 110 W
...

55 Wh
110 Wh
220 Wh
[1]

© OCR 2024

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12
4

Diabetes is a condition that causes a person’s blood sugar level to become too high
...

1400
1300
1200
1100
Blood sugar
concentration
3
(mg / dm )

1000
900
800
700
600

500 0

0
...
0

1
...
0

2
...
5 and 1
...

Give your answer to two significant figures
...
% [4]

© OCR 2024

13
(b)
(i) Blood glucose can be measured by doing a finger-prick blood sample
...

A test strip and testing meter are then used to show the blood glucose level at the time the test
is taken
...

Suggest the disadvantages of this method of blood sugar monitoring
...


...


...


...
co
...
co
...
Item removed due to third party copyright restrictions
...
diabetes
...
uk/blood-glucose-meters/abbott-freestyle-libre
...

1
...

2
...

[2]

© OCR 2024

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14
5 Indium (In) is a metal
...
The diagram shows a layer
of indium tin oxide on a glass screen
...
9 × 10
m in diameter
...
5 × 10

–9

m
...


Number of whole indium atoms =
...


...
[1]

© OCR 2024

15
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PLEASE DO NOT WRITE ON THIS PAGE

Turn over for the next question

© OCR 2024

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16
6

A student investigates the rate of cellular respiration in mung
beans
...

Two points have already been plotted
...


© OCR 2024

[1]

17
(c) Use the graph to calculate the rate of respiration
...


3
Rate of respiration =
...


3
Volume of oxygen uptake =
...

d
...
power supply

–

+

Carbon
electrode

Carbon
electrode

Concentrated sodium chloride solution
(a) Which ions are present in a concentrated solution of sodium chloride?
Tick (✓) one box
...


...


...


...
[2]

(c) The current in the circuit is 0
...

Calculate the charge that flows in the circuit in 15 minutes
...
C [3]
(d) The student adds two components to the circuit so that they can vary and measure the current
...



...



...

The table shows the radiation emitted and half-lives of 6 radioactive samples
...
0 days

D

Beta

2
...
3 years

F

Gamma

8 days

(a) Which sample is suitable to be used as a radioactive tracer for an imaging scan?
Explain your answer
...

Sample
...


...


...

[3]
(b) Samples A and B emit alpha radiation
...

1
...

[2]

© OCR 2024

21
(c) One of the samples in the table is radium-226
...

Use the Data and Equation Sheet
...
[2]
(d) How many outer shell electrons does each radium-226 atom have?
Explain your answer
...

Number of outer-shell electrons
...


...

[2]
(e) Another of the radioactive isotopes in the table is iodine-131
...

Copper
Gold
Neon
Sodium
[1]

© OCR 2024

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22
9

Some students are learning about radioactivity and radioactive half-life
...

The current produced by the particles
...

The number of decay events per second
...

[1]
(b) What is the definition of half-life?
Tick (✓) one box
...

Half the lifetime of a radioactive substance
...

The time for the activity to fall to half
...

900
800
700

Mathematical model

600
500
Activity (Bq)

400

Experimental data

300
200
100
0

0

50

100

150

200

Time (s)
Complete the sentences about radioactive decay
...

complete

match

random

replace

selective

trend

Radioactive decay is a
...


Experimental data may not
...


the model results due to chance

will be the same
...
You must write the question numbers clearly
in the margin
...


...


...


...


...


...


...


...


...


...


...


...


...

© OCR 2024

25

...


...


...


...


...


...


...


...


...


...


...


...


...


...


...


...


...


...


...


...


...


...


...


...


...


...


...

© OCR 2024

27
BLANK PAGE

PLEASE DO NOT WRITE ON THIS PAGE

© OCR 2024

28

PLEASE DO NOT WRITE ON THIS PAGE

Foundation

GCSE
Combined Science B Twenty First Century Science
J260/04: Combined science (Foundation Tier)
General Certificate of Secondary Education

Mark Scheme for June 2024

Oxford Cambridge and RSA Examinations

OCR (Oxford Cambridge and RSA) is a leading UK awarding body, providing a wide range of
qualifications to meet the needs of candidates of all ages and abilities
...


It is also responsible for developing new specifications to meet national requirements and
the needs of students and teachers
...

This mark scheme is published as an aid to teachers and students, to indicate the requirements
of the examination
...
It does not
indicate the details of the discussions which took place at an examiners’ meeting before
marking commenced
...

Mark schemes should be read in conjunction with the published question papers and the
report on the examination
...


Make sure that you have accessed and completed the relevant training packages for on-screen marking: RM Assessor Online Training; OCR
Essential Guide to Marking
...


Make sure that you have read and understood the mark scheme and the question paper for this unit
...


3
...


MARKING
1
...


2
...


3
...
It is essential that you meet the RM Assessor 50% and 100% (traditional 50% Batch 1 and
100% Batch 2) deadlines
...


4
...


2

J260/04
5
...


where a candidate crosses out an answer and provides an alternative response, the crossed out response is not marked and gains
no marks

b
...


6
...
If
the candidate has continued an answer there then add a tick to confirm that the work has been seen
...


There is a NR (No Response) option
...
g
...
g
...

Note: Award 0 marks – for an attempt that earns no credit (including copying out the question)
...


The RM Assessor comments box is used by your Team Leader to explain the marking of the practice responses
...
Do not use the comments box for any other reason
...


9
...
The report should contain notes on particular strengths displayed as well as common errors or weaknesses
...


3

J260/04
10
...
The
indicative scientific content in the Guidance column indicates the expected parameters for candidates’ answers, but be prepared to recognise and
credit unexpected approaches where they show relevance
...


Once the level is located, award the higher or lower mark:
The higher mark should be awarded where the level descriptor has been evidenced and all aspects of the communication statement
(in italics) have been met
...

In summary:
The skills and science content determines the level
...
Level of response question on this paper is 2d

4

J260/04

11
...


Mark Scheme

Abbreviations, annotations and conventions used in the detailed Mark Scheme (to include abbreviations and subject-specific
conventions)
...


Mark Scheme

June 2024

Subject-specific Marking Instructions

INTRODUCTION
Your first task as an Examiner is to become thoroughly familiar with the material on which the examination depends
...


You should ensure that you have copies of these materials
...
These are set out in the OCR
booklet Instructions for Examiners
...

Please ask for help or guidance whenever you need it
...


7

J260/04

Mark Scheme

June 2024

The breakdown of Assessment Objectives for GCSE (9-1) in Combined Science B:
Assessment Objective
AO1

Demonstrate knowledge and understanding of scientific ideas and scientific techniques and procedures
...
1

Demonstrate knowledge and understanding of scientific ideas
...
2
AO2

Demonstrate knowledge and understanding of scientific techniques and procedures
...


AO2
...


AO2
...


AO3
AO3
...

Analyse information and ideas to interpret and evaluate
...
1a

Analyse information and ideas to interpret
...
1b

Analyse information and ideas to evaluate
...
2

Analyse information and ideas to make judgements and draw conclusions
...
2a

Analyse information and ideas to make judgements
...
2b

Analyse information and ideas to draw conclusions
...
3

Analyse information and ideas to develop and improve experimental procedures
...
3a

Analyse information and ideas to develop experimental procedures
...
3b

Analyse information and ideas to improve experimental procedures
...
2

1
1

1
...
3a



up
(c)

Guidance

IGNORE glasses unqualified
IGNORE don’t get it on skin / do not touch
IGNORE protective clothing / apron

(Line drawn from:)

2



2
...
1

2

3
...
1a

ALLOW exercise

2

3
...
1b

Answer does not need to be phrased as a question

Guidance

IGNORE existing diseases / medicines



Do you have a stressful job?

June 2024



10

J260/04
(d)

Mark Scheme
6

Please refer to the marking instructions on page 4 of this
mark scheme for guidance on how to mark this question
...
1b

Indicative content may include e
...

Lifestyle
For
Stopping smoking has other benefits e
...

reduced cancer risk / financially better off
Reduces obesity / complications of obesity / get
fitter / better mental health
IGNORE lifestyle changes treat CVD / make you
better unqualified - answer needs e
...
reduces
cholesterol / blood pressure etc
Against
Requires will power / difficult to do / difficult to
keep up / can be expensive (e
...
gym and food)
Takes longer to take effect
Difficult to stop smoking / needs will power /
enjoy current lifestyle

Level 3 (5–6 marks)
Gives arguments for AND against treating CVD by both
lifestyle changes AND medicine
There is a well-developed line of reasoning which is
clear and logically structured
...

Level 2 (3–4 marks)
Gives arguments on one side only for lifestyle changes
AND medicine
OR
Gives arguments for AND against EITHER lifestyle
changes OR medicine
...
g
...
The information presented is relevant and
supported by some evidence
...
The information is in the most part relevant
...


11

J260/04
(e)

Mark Scheme
(i)
(ii)



1991

Any one from:
Stent procedures increased

1
2



3
...
1a

Each statement should cover range from 1998 to
2013
IGNORE figures
IGNORE statements referencing pre-1998

Rate of increase in stent procedures decreases
Any one from:
Coronary artery bypasses stayed (relatively) stable

Coronary artery bypasses decreased

June 2024





ALLOW coronary artery bypasses increase then
decrease



12

J260/04

Mark Scheme

Question
3 (a)

Answer
Electromagnetic



June 2024

Marks

AO
element

3

2
...
3 (W) award 3 marks
Select:
(power =) voltage x current
Substitute:
(power =) 3
...
1

3



1
...
1 x 2



DecreasedLess heating

220Wh
= 0
...
1

1

2
...
2 x 3

(× 100)

ALLOW sight of 1300 and 800
ALLOW sight of 500
ALLOW 500 ÷ 1300 (× 100)
ALLOW 0
...
46153…(%)

(b)

(i)

Any three from:



Have to carry it around
Idea of inconvenience / inconvenient place or time

Phobia of needles / blood

Risk of infection

Contamination

Pain / distress







1
...
2a

IGNORE inaccurate
IGNORE one drop of blood is not representative

2

3
...
g
...
g
...
5 x 10-9) ÷ (3
...
2 x 2



= 3
...
8



=3
(b)

Guidance

Indium tin oxide has Sn or O atoms (as well as In atoms)

1



15

3
...
2b

ALLOW there are other (not indium) atoms
present / the layer is not just made of indium

J260/04

Mark Scheme

Question
6 (a)

Answer
Any two points correctly plotted

Marks



2

OR
Three points correctly plotted



Appropriate line of best fit

(c)

First check the answer on answer line
If answer is to 2sf and in the range from 0
...
29
inclusive (mm3/s) and there is evidence of use of the
graph, award 4 marks
Evidence of triangle drawn on the graph

= e
...
0
...
2

Line must extend to first and last plotted points
Line must be a single straight line drawn with a
ruler

4

2
...
g
...
2
IGNORE extra plots at times other than 120, 140
and 180 s
ALLOW half a square tolerance



(b)

= e
...
0
...
g
...
25 – 0
...
2a

ALLOW answer in range 37
...
5 inclusive
ALLOW ECF from 6c i
...
150 x answer to 6c

J260/04

Mark Scheme

Question
7

(a)
(b)

Answer

Cl-



H+

Na+



(i)

Chlorine

(ii)

(Damp blue) litmus paper

OH-



Bleaches / turns white (as final result)

June 2024

Marks

AO
element

1
1

2
...
2

2

1
...
01 x 900
Conversion: 15 minutes = 900 seconds

=9(C)
(d)

test
glowing splint

1
...
1 x 2



ALLOW 0
...
15 (C) for 2 marks



1

2
...
2

ALLOW ampmeter

(i)

Variable resistor

(ii)

Ammeter



17

result
relights

J260/04

Mark Scheme

Question
8

(a)

Answer
D or F



June 2024

Marks

AO
element

3

3
...
3a

Wear device that tells you when you’ve been exposed
too long 

IGNORE leaving the room as this question asks
about ‘handling’ the source

Store it in (lead-lined) box / container 

IGNORE ‘reduce the amount exposed to’
unqualified

Wear protective clothing / wear gloves 

IGNORE goggles

Do not touch it (if solid) / use tongs 
Wash hands after use 
Do not point sources directly at people 
Reduce time handling


18

J260/04

Mark Scheme

Question
(c)

Answer
First check the answer on answer line
If answer = 138 award 2 marks

June 2024

Marks

AO
element

2

2
...
1

1

3
...








Match


Trend

20

June 2024

Marks

AO
element

1
1

1
...
1

3

1
...




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