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100+ Free OAT Practice Questions

Pass your Optometry Admission Test exam on the first try — instant access, no signup required.

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A 5 kg block slides down a frictionless incline angled at 30° from the horizontal. What is the acceleration of the block along the incline? (g = 10 m/s²)

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OAT Physics

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OAT Quantitative Reasoning

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OAT Reading Comprehension

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OAT Survey of Natural Sciences

Practice Questions
2026 Statistics

Key Facts: OAT Exam

230 questions

Total exam length

OAT 2025 Candidate Guide (ADA/ASCO)

200–400 scale

Score range per section

OAT 2025 Candidate Guide

~300 national mean

Average OAT score

ASCO / OAT Program

$510 USD

Registration fee (2025–2026)

oat.ada.org, effective July 2025

5 hours 5 minutes

Total administration time

OAT 2025 Candidate Guide

90-day wait

Minimum between attempts

OAT 2025 Candidate Guide

The OAT contains 230 multiple-choice questions administered over approximately 5 hours at Prometric testing centers nationwide (2025 Candidate Guide). Each of the four sections is scored on a 200–400 scale with a national mean of approximately 300; an Academic Average is also reported. Competitive applicants at top optometry programs typically achieve scores of 320–340 or higher. The exam fee is $510 USD (effective July 2025), and candidates must wait at least 90 days between attempts. All 23 accredited U.S. optometry schools and the University of Waterloo require OAT scores for admission.

Sample OAT Practice Questions

Try these sample questions to test your OAT exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which organelle is primarily responsible for ATP synthesis via oxidative phosphorylation?
A.Smooth endoplasmic reticulum
B.Golgi apparatus
C.Mitochondria
D.Lysosome
Explanation: Mitochondria contain the electron transport chain and ATP synthase on their inner membrane, which couples the proton gradient to ATP production. This process, oxidative phosphorylation, generates the majority of cellular ATP.
2During meiosis I, homologous chromosomes are separated. This reduction division results in daughter cells that are:
A.Diploid, with replicated chromosomes
B.Haploid, with replicated chromosomes
C.Diploid, with unreplicated chromosomes
D.Haploid, with unreplicated chromosomes
Explanation: After meiosis I, each daughter cell contains one chromosome from each homologous pair (haploid, n), but each chromosome still consists of two sister chromatids joined at the centromere (replicated). The sister chromatids are not separated until meiosis II.
3Which enzyme removes RNA primers during DNA replication in prokaryotes?
A.DNA polymerase III
B.DNA polymerase I
C.Helicase
D.Primase
Explanation: DNA polymerase I in prokaryotes has 5'→3' exonuclease activity that removes RNA primers and replaces them with DNA nucleotides. DNA polymerase III is the main replicative enzyme that elongates DNA chains.
4In aerobic respiration, which metabolic pathway directly produces NADH from pyruvate and acetyl-CoA?
A.Glycolysis
B.Krebs cycle
C.Electron transport chain
D.Fermentation
Explanation: The Krebs (citric acid) cycle oxidizes acetyl-CoA, generating 3 NADH, 1 FADH2, 1 GTP (or ATP), and 2 CO2 per turn. Pyruvate decarboxylation to acetyl-CoA also produces one NADH before entry into the cycle.
5A cell is placed in a hypotonic solution. Which of the following will occur?
A.Water moves out of the cell by osmosis, causing it to shrink
B.Water moves into the cell by osmosis, causing it to swell
C.Solutes move into the cell by active transport
D.No net movement of water occurs
Explanation: A hypotonic solution has a lower solute concentration (higher water potential) than the cell interior. By osmosis, water moves from high water potential to low water potential — into the cell — causing it to swell and potentially lyse.
6In the lac operon of E. coli, which molecule directly inactivates the lac repressor?
A.Glucose
B.Lactose
C.Allolactose
D.cAMP
Explanation: Allolactose, a structural isomer of lactose produced by β-galactosidase, acts as the inducer. It binds directly to the lac repressor, causing a conformational change that releases it from the operator, allowing transcription.
7Which of the following correctly describes crossing over during meiosis?
A.Exchange of segments between non-homologous chromosomes at anaphase I
B.Exchange of segments between sister chromatids at metaphase II
C.Exchange of segments between non-sister chromatids of homologous chromosomes at prophase I
D.Exchange of entire chromosomes between homologs at telophase I
Explanation: Crossing over (recombination) occurs during prophase I when non-sister chromatids of homologous chromosome pairs exchange corresponding segments at chiasmata. This increases genetic diversity in gametes.
8The sodium-potassium pump (Na+/K+-ATPase) moves ions against their concentration gradients. This process is best classified as:
A.Facilitated diffusion
B.Simple diffusion
C.Primary active transport
D.Secondary active transport
Explanation: Primary active transport directly uses ATP hydrolysis to move ions against their electrochemical gradients. The Na+/K+-ATPase pumps 3 Na+ out and 2 K+ in per ATP hydrolyzed, establishing the resting membrane potential.
9A plant cell in bright sunlight produces oxygen. Which organelle is responsible, and from what source?
A.Mitochondria, from CO2 reduction
B.Chloroplast, from water splitting
C.Peroxisome, from hydrogen peroxide
D.Chloroplast, from CO2 fixation
Explanation: In the light reactions of photosynthesis (occurring in the thylakoid membrane of chloroplasts), water is split by photosystem II (photolysis) — 2H2O → 4H+ + 4e− + O2 — releasing oxygen as a byproduct.
10In a dihybrid cross between two AaBb parents, what fraction of offspring will show both dominant phenotypes?
A.1/4
B.9/16
C.3/4
D.1/16
Explanation: For two independently assorting gene pairs, each AaBb × AaBb cross gives a 9:3:3:1 phenotypic ratio. The 9/16 fraction shows both dominant phenotypes (A_B_). The 9 comes from P(at least one A) × P(at least one B) = (3/4)(3/4) = 9/16.

About the OAT Exam

The Optometry Admission Test (OAT) is a standardized, computer-based examination required for admission to all U.S. optometry schools and the University of Waterloo (Canada). It consists of 230 multiple-choice questions across four sections: Survey of Natural Sciences (Biology, General Chemistry, Organic Chemistry), Reading Comprehension, Physics, and Quantitative Reasoning. Unlike the DAT, the OAT includes a Physics section instead of the Perceptual Ability Test.

Questions

230 scored questions

Time Limit

5 hours 5 minutes (4 sections: 90 min + 60 min + 50 min + 45 min, plus optional break and tutorial)

Passing Score

Scaled scores 200–400 per section; Academic Average score reported. No universal passing score — schools set their own minimums (typically 300–320+).

Exam Fee

$510 USD (effective July 2025 through June 2026) (ADA Department of Testing Services (DTS) on behalf of ASCO; delivered at Prometric test centers)

OAT Exam Content Outline

43%

Survey of Natural Sciences

100 questions: 40 Biology (cell biology, genetics, molecular biology), 30 General Chemistry, 30 Organic Chemistry. 90-minute time limit.

22%

Reading Comprehension

50 questions across 3 scientific passages (≈16–17 questions each). Tests comprehension, inference, and application. 60 minutes.

17%

Physics

40 questions on mechanics, waves, optics, electricity and magnetism, thermodynamics, and modern physics. No calculator. 50 minutes.

17%

Quantitative Reasoning

40 questions on algebra, geometry, trigonometry, probability, statistics, and mathematical word problems. On-screen calculator provided. 45 minutes.

How to Pass the OAT Exam

What You Need to Know

  • Passing score: Scaled scores 200–400 per section; Academic Average score reported. No universal passing score — schools set their own minimums (typically 300–320+).
  • Exam length: 230 questions
  • Time limit: 5 hours 5 minutes (4 sections: 90 min + 60 min + 50 min + 45 min, plus optional break and tutorial)
  • Exam fee: $510 USD (effective July 2025 through June 2026)

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

OAT Study Tips from Top Performers

1Prioritize the Survey of Natural Sciences — it is the largest section (43% of questions) and many students find Organic Chemistry the most challenging component. Allocate at least 40% of your study time here.
2Master Physics formulas without a calculator: practice kinematics equations, optics (Snell's Law, thin-lens equation), and electricity (Ohm's Law, power equations) by hand — the Physics section is no-calculator.
3For Reading Comprehension, practice passage efficiency: aim to read each passage in 8–10 minutes and answer its 16–17 questions in 10–12 minutes. Focus on passage-based answers only — outside knowledge can mislead you.
4Use the OAT's on-screen calculator strategically in Quantitative Reasoning: solve algebraically first to set up the problem, then use the calculator only for arithmetic to save time.
5Take at least one full-length timed practice test 4–6 weeks before your exam date. Identify weak sections and dedicate the remaining time to targeted review, emphasizing your lowest-scoring section.

Frequently Asked Questions

How is the OAT different from the DAT?

The OAT and DAT share three sections: Survey of Natural Sciences, Reading Comprehension, and Quantitative Reasoning. The key difference is that the OAT replaces the DAT's Perceptual Ability Test (PAT) with a Physics section, reflecting the greater importance of optics and physics in optometry.

What is a competitive OAT score?

Scores are reported on a 200–400 scale per section and as an Academic Average. The national mean is approximately 300. Most competitive optometry programs look for scores of 320–340 or higher, though requirements vary by school. The top optometry programs typically report median accepted applicant scores of 330–350.

How many times can I take the OAT?

Candidates may retake the OAT an unlimited number of times, but must wait at least 90 days between attempts. After three or more attempts, written permission from the OAT Program is required, and candidates may then retest only once per 12-month period. Scores from the four most recent attempts are reported to schools.

Is a calculator allowed on the OAT?

An on-screen calculator is provided for the Quantitative Reasoning section only. No personal calculators, writing instruments, or scratch paper are allowed in the testing room; two noteboards and markers are provided.

When should I take the OAT?

ASCO recommends completing at least one year of college coursework in biology, general chemistry, organic chemistry, and physics before attempting the OAT. Most successful test-takers have completed two or more years of college. Schedule your test at least 4 weeks before your optometry school application deadlines to ensure timely score reporting.

What resources are available for OAT preparation?

Official resources include the OAT Candidate Guide (free PDF from oat.ada.org) and Prometric practice tests (individual section modules available for $20 each). Popular commercial prep resources include OAT Destroyer, Kaplan OAT, and Chad's Videos. OpenExamPrep offers free practice questions covering all four OAT sections.