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

GCSE Combined Science (Edexcel)

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

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.

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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.

How long do you get?

The test is timed at 60 minutes. Our full mock runs on the same clock so you can practise your pacing.

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.