Free USMLE – United States Medical Licensing Examination Practice Test Question

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Question 1

What cell type secrets surfactant?

Select an option, then click Submit answer.

  • ○

    Plasma cell

  • ○

    Type I alveolar cell

  • ○

    Type II alveolar cell

  • ○

    Type III alveolar cell

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About the USMLE Free Practice Test

This free practice test covers the United States Medical Licensing Examination (USMLE) exam from Test Prep. You will find 20 free questions, drawn from the full Study4Pass practice set of 622 questions for this exam. The free sample is made up of 20 single-answer questions, each with a full explanation. The questions follow the same topic balance as the real exam: Basic science, Clinical practice and And medical ethics. The United States Medical Licensing Examination (USMLE) is a three-step exam for medical licensure in the United States.

The target audience for Test Prep USMLE Exam is medical students, medical professionals, and medical school applicants who are preparing to take the USMLE (United States Medical Licensing Examination). The USMLE Step 1 exam is a multiple-choice exam that assesses your knowledge of the basic sciences relevant to the practice of medicine.

  • Certification: United States Medical Licensing Examination (USMLE)
  • Vendor: Test Prep
  • Free on this page: 20 practice questions with answers and explanations
  • Full practice set: 622 questions

Use the sample the way you would use the real thing: answer each question on your own first, then open the explanation and make sure you understand why the right answer is right. That habit — reasoning instead of memorizing — is what carries over to exam day. When a topic keeps tripping you up, that is your study plan telling you where to go next.

When you finish the sample, do not just count the score — read it. Every missed question names a topic, and the full set lets you train that topic on its own until it stops costing you marks. That loop of test, review and targeted practice is how this set is designed to be used, from the first free question to the last simulation.

Inside the full USMLE practice set:

  • All 622 questions with answers and explanations
  • Timed Exam Simulation that mirrors the real exam pressure
  • Topic Training to drill one domain at a time
  • Ask AI for More Explanation on every question
  • Flag questions and review them before you finish

How to use this USMLE free practice test

Pick an answer for each question and check it straight away — the correct answer and a full explanation appear under the question. There is no time limit and nothing to sign up for. When an explanation is not enough, use Ask AI: this is an AI-Enabled practice test, and Ask AI explains the concept behind the question in plain language. Ready for more? The full 622-question set adds a timed Exam Simulation mode, topic training for your weak areas, and a flagged-question review, so you can practise the way the real exam feels.

What to study for each USMLE domain

  • Basic science — Work through the Basic science questions until the reasoning behind each answer is clear — guessing your way past this area will show up on exam day.
  • Clinical practice — Use the practice questions to find your gaps in Clinical practice first, then read the official Test Prep documentation for anything you missed.
  • And medical ethics — For And medical ethics, focus on understanding why each correct answer is right; the real exam rewards reasoning over recall.

USMLE practice test — quick questions

Is this USMLE practice test free?

Yes — the 20 questions on this page are completely free, with no signup and no payment details needed.

How many questions are in the full USMLE set?

622 questions. The 20 free questions above are a sample of that full set, in the same style and topic balance.

Does the free test show the answers?

Yes — every question shows the correct answer with an explanation, and Ask AI can explain the concept behind a question in plain words if you want to go deeper.

Is this the real USMLE exam?

No. This is a practice test: the questions are written to mirror the real USMLE exam’s topics and difficulty, not copied from it.

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