GCSE Combined Science (Edexcel): Free Mock Test & Practice Questions

GCSE Combined Science (Edexcel)

Trilogy-style mixed biology, chemistry and physics. Edexcel board.

Written against the published specification.

About this practice. Revision Robin is built and maintained by Bloor Engineering Ltd, a UK-registered company. Our GCSE Combined Science (Edexcel) questions are written and reviewed in-house to match the current syllabus, each with a plain-English worked explanation. They are original practice material, not the official exam questions and not affiliated with or endorsed by Edexcel. Always confirm current test rules, fees and content with the official provider. See our Terms and Privacy.

Little and often beats one big session. Five minutes on the bus counts.

Free practice questions

Try 3 real GCSE Combined Science (Edexcel) questions

Have a go, then reveal the worked explanation. A taster from a bank of 239 original questions. Unlock for unlimited drills and full timed mocks.

Q1. Which structure is found in both plant and animal cells?

A. Cell wall
B. Chloroplast
C. Mitochondrion
D. Permanent vacuole

Show answer & explanation

✓ Answer: C. Mitochondrion

Mitochondria are present in both plant and animal cells because both need aerobic respiration to release energy. Cell walls, chloroplasts and large permanent vacuoles are only found in plant (and some other) cells, not animal cells.

Q2. A student increases the light intensity on pondweed and the rate of photosynthesis rises, then levels off even as light intensity keeps increasing. What has become the limiting factor?

A. Carbon dioxide concentration or temperature
B. The colour of the light
C. The amount of water in the pondweed
D. Light intensity is still limiting

Show answer & explanation

✓ Answer: A. Carbon dioxide concentration or temperature

Once increasing light no longer increases the rate, light is no longer limiting — another factor such as CO2 concentration or temperature must be capping the reaction. This is the standard 'limiting factors' graph interpretation tested in Edexcel Combined Science.

Q3. Why does an ionic compound like magnesium chloride, MgCl2, have the formula ratio it does?

A. The charges of the ions must balance overall, so one Mg²⁺ ion needs two Cl⁻ ions
B. Magnesium and chlorine atoms always combine in a 1:2 ratio by mass
C. Chlorine always forms 2− ions when bonding with metals
D. The formula shows the number of covalent bonds between the atoms

Show answer & explanation

✓ Answer: A. The charges of the ions must balance overall, so one Mg²⁺ ion needs two Cl⁻ ions

In an ionic compound the overall charge must be zero, so the positive and negative charges must balance; since Mg forms a 2+ ion and Cl forms a 1− ion, two chloride ions are needed to balance one magnesium ion. This gives the formula MgCl2, reflecting a ratio of ions rather than a ratio by mass or a count of covalent bonds, since ionic compounds contain no covalent bonds between the ions.

Exam mode

Full mock exam

40 random questions, real timing, marked against the official pass mark. Different every time.

The first 8 of 40 questions are free, with your score on them. Finishing the paper, your result against the pass mark and every answer explained come with the paid version.

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Topic drills

Ten quick questions on one topic, marked instantly with explanations.

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Who has to sit the GCSE Combined Science (Edexcel)

Who needs a GCSE Combined Science (Edexcel)?

Mandatory for all students in England until age 16. Often required for A-Level sciences, health/care courses, and primary teacher training.

The real GCSE Combined Science (Edexcel): format

How long is the GCSE Combined Science (Edexcel)?

The real GCSE Combined Science (Edexcel) lasts 420 minutes. Our mock uses 40 questions in 60 minutes.

What it costs, and what a resit costs

How much does the GCSE Combined Science (Edexcel) cost?

Rebooking after a fail: May/June series only; no November series for science, so yearly wait if missed.

How hard is it

How hard is the GCSE Combined Science (Edexcel)?

Difficulty: Covers Biology, Chemistry, Physics (less depth than Triple Science). Can be demanding due to breadth and switching between scientific thinking types. Tier and mathematical skills impact difficulty.

Figures for the real exam from vertexaisearch.cloud.google.com, checked October 2026. Fees and rules change, so confirm with the test provider before you book.

GCSE Combined Science (Edexcel): common questions

Frequently asked

How many questions are in the GCSE Combined Science (Edexcel)?

The exam has 40 questions. Every Revision Robin mock uses the same 40-question format so your practice matches the real thing.

What is the pass mark for the GCSE Combined Science (Edexcel)?

You need 24 out of 40 correct to pass, which is about 60%. Our mocks mark you against this exact threshold.

Are these the real exam questions?

No. Our questions are original and written to match the current syllabus, so they give realistic practice without copying the official paper. Every answer comes with a plain-English explanation. Always confirm current rules and content with Edexcel.