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MCAT Mock Test
A timed 25-question mock for the Medical College Admission Test covering biology, chemistry, physics. Answer, submit and review every question with its explanation; set negative marking to match your exam’s current scheme.
MCAT mock test
25 questions · 1 mark each · the timer starts with your first answer and the test submits itself when time runs out.
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Q1.BiologyThe largest organ of the human body is the:
Answer: C — Skin
The skin is the largest organ by area and weight.
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Q2.ChemistryAvogadro’s number is approximately:
Answer: A — 6.022 × 10²³
One mole contains 6.022 × 10²³ particles.
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Q3.PhysicsWhich colour of visible light has the longest wavelength?
Answer: A — Red
Red light has the longest wavelength (~700 nm).
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Q4.BiologyWho proposed the theory of evolution by natural selection?
Answer: A — Charles Darwin
Darwin (with Wallace) proposed natural selection; ‘On the Origin of Species’ was published in 1859.
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Q5.Chemistry90 g of KCl (molar mass 74.5) is dissolved to make 2000 mL of solution. Find the molarity.
Answer: A — 0.604 M
Moles = 90/74.5 = 1.208; molarity = moles ÷ litres = 1.208 ÷ 2 = 0.604 M.
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Q6.PhysicsA current of 2 A flows through a 4 Ω resistor. What is the potential difference across it?
Answer: D — 8 V
Ohm’s law: V = IR = 2 × 4 = 8 V.
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Q7.BiologyThe green pigment in plants is:
Answer: C — Chlorophyll
Chlorophyll absorbs red and blue light for photosynthesis.
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Q8.ChemistryA solution with pH 3 is:
Answer: B — Acidic
pH below 7 is acidic.
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Q9.PhysicsWhich particle has no electric charge?
Answer: C — Neutron
Neutrons are electrically neutral.
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Q10.BiologyAntibiotics are effective against:
Answer: A — Bacteria
Antibiotics target bacteria, not viruses.
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Q11.ChemistryWhat is the mass of 1 mol of glucose (C₆H₁₂O₆)? (Molar mass 180 g/mol)
Answer: B — 180 g
Mass = moles × molar mass = 1 × 180 g/mol = 180 g.
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Q12.PhysicsWhat force is needed to accelerate a 2 kg mass at 8 m/s²?
Answer: A — 16 N
F = ma = 2 × 8 = 16 N.
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Q13.BiologyMalaria is caused by:
Answer: C — Plasmodium (a protozoan)
Plasmodium parasites are spread by female Anopheles mosquitoes.
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Q14.ChemistryThe noble gas used in advertising signs that glows red-orange is:
Answer: A — Neon
Neon glows red-orange in discharge tubes.
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Q15.PhysicsThe device that converts mechanical energy into electrical energy is a:
Answer: B — Generator
A generator uses electromagnetic induction.
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Q16.BiologyWhich organelle synthesises proteins?
Answer: C — Ribosome
Ribosomes translate mRNA into protein.
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Q17.ChemistryWhat is the pH of a solution with [OH⁻] = 10⁻⁶ mol/L at 25 °C?
Answer: A — 8
[OH⁻] = 10⁻⁶ → pOH = 6; pH = 14 − 6 = 8 (at 25 °C).
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Q18.PhysicsFind the kinetic energy of a 22 kg body moving at 9 m/s.
Answer: C — 891 J
KE = ½mv² = ½ × 22 × 9² = 891 J.
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Q19.BiologyWhich part of the brain controls balance and coordination?
Answer: B — Cerebellum
The cerebellum coordinates movement and balance.
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Q20.ChemistryWater has a maximum density at about:
Answer: D — 4 °C
Water is densest at about 4 °C.
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Q21.PhysicsThe bending of light as it passes from one medium to another is:
Answer: D — Refraction
Refraction is caused by a change in light’s speed.
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Q22.BiologyInsulin is secreted by the:
Answer: C — Pancreas
Beta cells of the pancreatic islets of Langerhans secrete insulin.
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Q23.ChemistryWhat is the pH of a solution with [H⁺] = 10⁻⁶ mol/L?
Answer: A — 6
pH = −log[H⁺] = −log(10⁻⁶) = 6.
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Q24.PhysicsFind the kinetic energy of a 31 kg body moving at 6 m/s.
Answer: A — 558 J
KE = ½mv² = ½ × 31 × 6² = 558 J.
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Q25.BiologyBile is produced by the:
Answer: A — Liver
Bile is made in the liver and stored in the gall bladder.
How the mock test works
- The timer starts with your first answer; the test submits itself when time runs out.
- Choose the negative marking that matches your exam (this test has no negative marking by default — check the official notification).
- After submitting you get your score, accuracy, time taken and a topic-wise breakdown, then every explanation.
- “New mock test” builds another paper — calculation questions get new numbers.
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.
MCAT practice topics
| Topic | Section | Question source |
|---|---|---|
| Biology | Science | Question bank |
| Chemistry | Science | Calculated + question bank |
| Physics | Science | Calculated + question bank |