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MCAT Practice Questions
Original practice questions for the Medical College Admission Test (Association of American Medical Colleges (AAMC)), mixed across 3 topics with instant answers and explanations. Practise by topic below or take the timed mock test.
MCAT mixed practice
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Q1.BiologyXylem in plants transports:
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Answer: C — Water and minerals
Xylem carries water and minerals upward; phloem carries food.
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Q2.ChemistryThe main component of natural gas is:
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Answer: B — Methane
Methane (CH₄).
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Q3.PhysicsThe device that converts mechanical energy into electrical energy is a:
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Answer: A — Generator
A generator uses electromagnetic induction.
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Q4.BiologyPhotosynthesis takes place in the:
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Answer: D — Chloroplasts
Chloroplasts contain chlorophyll that captures light energy.
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Q5.ChemistryWhat is the mass of 4 mol of ammonia (NH₃)? (Molar mass 17 g/mol)
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Answer: B — 68 g
Mass = moles × molar mass = 4 × 17 g/mol = 68 g.
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Q6.PhysicsFind the power dissipated when 2 A flows through a 4 Ω resistor.
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Answer: A — 16 W
P = I²R = 2² × 4 = 16 W.
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Q7.BiologyInsulin is secreted by the:
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Answer: A — Pancreas
Beta cells of the pancreatic islets of Langerhans secrete insulin.
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Q8.ChemistryWhich gas is responsible for most of the greenhouse effect from human activity?
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Answer: C — Carbon dioxide
CO₂ from burning fossil fuels is the largest human-caused contributor.
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Q9.PhysicsThe speed of light in vacuum is approximately:
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Answer: D — 3 × 10⁸ m/s
c ≈ 2.998 × 10⁸ m/s.
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Q10.BiologyWhich of these is a vestigial organ in humans?
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Answer: B — Appendix
The vermiform appendix is considered vestigial.
About MCAT
Medical College Admission Test — conducted by Association of American Medical Colleges (AAMC). Medical school admission test covering biological, chemical, physical, psychological and social foundations.
Original practice questions written for this site in the style and difficulty of each exam’s syllabus. They are not past papers and the site is not affiliated with any exam body. Exam patterns, marking schemes and syllabi change — always check the latest official notification.
Practise by topic
- Biology questions — Learn structure → function links (mitochondria → ATP, nephron → filtration), the major hormones and their glands, and deficiency diseases.
- Chemistry questions — Moles = mass ÷ molar mass; molarity = moles ÷ litres.
- Physics questions — Write the formula before substituting and keep SI units throughout.
- MCAT mock test — 25 timed questions.
MCAT practice topics
| Topic | Section | Question source |
|---|---|---|
| Biology | Science | Question bank |
| Chemistry | Science | Calculated + question bank |
| Physics | Science | Calculated + question bank |