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GCSE Combined Science (OCR)

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

Pass mark 24/40 60 minutes OCR How many can I get wrong?
Don't cram it, drill it. Ten questions a topic beats an hour re-reading.
Free practice questions
Try 3 real GCSE Combined Science (OCR) questions
Have a go, then reveal the worked explanation. A taster from a bank of 210 original questions — unlock for unlimited drills and full timed mocks.
Q1. Which structure is found in a plant cell but not in an animal cell?
  • A.  Nucleus
  • B.  Cell wall
  • C.  Mitochondrion
  • D.  Cytoplasm
Show answer & explanation
✓ Answer: B. Cell wall
Plant cells have a rigid cell wall made of cellulose that supports and shapes the cell; animal cells have only a flexible cell membrane. Both cell types have a nucleus, mitochondria and cytoplasm, so these do not distinguish them.
Q2. Which factor is most likely to limit the rate of photosynthesis in a well-lit greenhouse on a warm summer day?
  • A.  Light intensity
  • B.  Carbon dioxide concentration
  • C.  Temperature
  • D.  Water availability
Show answer & explanation
✓ Answer: B. Carbon dioxide concentration
On a bright warm day, light and temperature are already high, so carbon dioxide concentration (normally only around 0.04% of air) becomes the limiting factor. This is why greenhouses are often supplemented with CO2 to boost growth.
Q3. Diamond and graphite are both giant covalent structures made of carbon. Why does graphite conduct electricity but diamond does not?
  • A.  Graphite contains ionic bonds while diamond does not
  • B.  Each carbon in graphite is bonded to only three others, leaving one delocalised electron per atom free to move; diamond's carbons are all bonded to four others with no free electrons
  • C.  Diamond has no covalent bonds at all
  • D.  Graphite has metallic ions that carry charge
Show answer & explanation
✓ Answer: B. Each carbon in graphite is bonded to only three others, leaving one delocalised electron per atom free to move; diamond's carbons are all bonded to four others with no free electrons
In graphite, each carbon atom forms three covalent bonds, leaving one delocalised electron per atom that can move between layers and carry charge. In diamond, every carbon forms four strong covalent bonds, so there are no free electrons or ions to conduct.
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Biology — cells, organisation & infection · 36
Biology — bioenergetics, homeostasis & ecology · 35
Chemistry — atoms, bonding & quantitative · 34
Chemistry — changes, rates & organic · 38
Physics — energy, electricity & particles · 32
Physics — forces, waves & magnetism · 35
GCSE Combined Science (OCR) — common questions
Frequently asked
How many questions are in the GCSE Combined Science (OCR)?
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 (OCR)?
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 OCR.