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OCR · GCSE · Combined Science (Gateway / Twenty First Century)

Free OCR GCSE Combined Science (Gateway / Twenty First Century)
Practice Paper

8 mixed-difficulty practice questions in the style of real OCR GCSE papers — answers, mark-scheme-style explanations, and the official exam structure all on one page.

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What the real OCR GCSE Combined Science (Gateway / Twenty First Century) paper looks like

Paper 1
Approximately 1 hour 30 minutes, ~70-100 marks. Covers Topics 1-4 of the specification.
Paper 2
Approximately 1 hour 30 minutes, ~70-100 marks. Covers Topics 5-8 of the specification.
Paper 3
Where applicable — e.g. Combined Science, Languages. Includes synoptic and applied questions.
Total exam time: ~3 hours across two or three papers.
Grading: Grades: 9 (highest) to 1 (lowest), with U (ungraded). A grade of 4 is a standard pass; 5 is a strong pass.

Mini practice paper: 8 questions

Mixed-difficulty questions from across the Combined Science (Gateway / Twenty First Century) syllabus. Tap "Show answer" after each to check yourself.

Q1 · Difficulty 1/3

Enzymes are biological catalysts made of:

  1. DNA
  2. protein
  3. lipid
  4. carbohydrate
Show answer & explanation
✓ Answer: B — protein
Enzymes are proteins.
Q2 · Difficulty 1/3

Vertical columns of the periodic table are:

  1. blocks
  2. groups
  3. periods
  4. shells
Show answer & explanation
✓ Answer: B — groups
Vertical columns are groups.
Q3 · Difficulty 1/3

The variety of species in an ecosystem is:

  1. biodiversity
  2. abundance
  3. biomass
  4. distribution
Show answer & explanation
✓ Answer: A — biodiversity
Biodiversity is the range of species.
Q4 · Difficulty 2/3

Anaerobic respiration in human muscle produces:

  1. ethanol and CO₂
  2. glucose
  3. oxygen
  4. lactic acid
Show answer & explanation
✓ Answer: D — lactic acid
Human anaerobic respiration produces lactic acid.
Q5 · Difficulty 2/3

Gametes are produced by which cell division?

  1. binary fission
  2. budding
  3. meiosis
  4. mitosis
Show answer & explanation
✓ Answer: C — meiosis
Meiosis produces gametes.
Q6 · Difficulty 2/3

The most abundant gas in the atmosphere is:

  1. carbon dioxide
  2. argon
  3. nitrogen
  4. oxygen
Show answer & explanation
✓ Answer: C — nitrogen
Nitrogen is about 78% of air.
Q7 · Difficulty 1/3

The unit of power is the:

  1. joule
  2. newton
  3. ohm
  4. watt
Show answer & explanation
✓ Answer: D — watt
Power is measured in watts.
Q8 · Difficulty 1/3

The particles in the nucleus of an atom are:

  1. electrons only
  2. protons and neutrons
  3. protons and electrons
  4. neutrons and electrons
Show answer & explanation
✓ Answer: B — protons and neutrons
The nucleus contains protons and neutrons.
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OCR GCSE Combined Science (Gateway / Twenty First Century) FAQ

What does the OCR GCSE Combined Science (Gateway / Twenty First Century) exam look like?
The OCR GCSE Combined Science (Gateway / Twenty First Century) exam is structured across 3 components. Paper 1: Approximately 1 hour 30 minutes, ~70-100 marks. Covers Topics 1-4 of the specification. Paper 2: Approximately 1 hour 30 minutes, ~70-100 marks. Covers Topics 5-8 of the specification. Paper 3: Where applicable — e.g. Combined Science, Languages. Includes synoptic and applied questions. Total exam time: ~3 hours across two or three papers.
Can I download a free OCR GCSE Combined Science (Gateway / Twenty First Century) past paper?
Real OCR past papers are published directly by OCR on their official website. Kramizo doesn't redistribute copyrighted past papers, but we do generate free AI-written practice papers in the exact same style — same command words, same difficulty tier, same mark conventions. Use this practice paper as warm-up, then time yourself on official past papers before exam day.
How is OCR GCSE Combined Science (Gateway / Twenty First Century) graded?
Grades: 9 (highest) to 1 (lowest), with U (ungraded). A grade of 4 is a standard pass; 5 is a strong pass. Kramizo's practice questions are tagged with difficulty 1-3 mapping roughly to the lower, middle, and top grade boundaries you'll encounter in the real exam.