MDCAT past papers

The archive holds 115 paper rows; 1 disabled duplicate is not offered. Some older papers are partial. The number above is the positions recovered for that paper, not a coverage score.

1. Question 1, English, Formal and Lexical Aspect of Language, UHS 2026 (recalled)
   The cat chased the rat $\underline{\text{everywhere}}$. The underlined word is _______.
   • AAdverb of time
   • BAdverb of manner
   • CAdverb of frequency
   • DAdverb of place (correct answer)

   Correct answer: D

   'Everywhere' functions as an adverb of place because it modifies the verb 'chased' by answering the question 'where?'.
2. Question 2, Biology, Enzymes, DUHS 2026
   According to the rigid "Lock and Key" model of enzyme action, which statement is true?
   • AThe active site is flexible and changes shape upon substrate binding
   • BThe active site is a rigid structure, and the substrate is perfectly complementary to it (correct answer)
   • CThe active site is non-rigid, and the substrate is non-complementary
   • DThe substrate changes its configuration permanently to fit a flexible active site

   Correct answer: B

   Under Emil Fischer's Lock and Key model, the enzyme's active site is a pre-formed, rigid template exactly complementary to its specific substrate.
3. Question 3, Chemistry, Fundamentals of Chemistry, KMU 2026
   What is the mass of 1 mole of calcium carbonate (CaCO3)? (Molar mass of calcium: 40 g/mol, carbon: 12 g/mol, oxygen: 16 g/mol)
   • A25 g
   • B50 g
   • C75 g
   • D100 g (correct answer)

   Correct answer: D

   The mass of $1\text{ mole}$ of $\text{CaCO}_3$ equals its molar mass, calculated by summing the relative atomic masses ($40 + 12 + 3 \times 16$), giving exactly $100\text{ g}$.
4. Question 4, Physics, Force and Motion, NUMS 2026
   The vertical height and horizontal range of projectiles are equal at angle:
   • A30o
   • B45o
   • C76o (correct answer)
   • D90o

   Correct answer: C

   A projectile's maximum height equals its horizontal range when $\tan\theta = 4$, yielding a launch angle of approximately $76^\circ$.
5. Question 5, Logical Reasoning, Logical Problems, Federal 2026
   If 5 is subtracted from 30, what will be the square root of remaining?
   • A25
   • B30
   • C5 (correct answer)
   • D10

   Correct answer: C

   Subtracting 5 from 30 yields 25, and calculating the principal square root of this remainder results in 5.