USMLE Step 1 quiz

More questions about USMLE Step 1

These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.

1. 1 Easy

   Which exam sequentially follows USMLE Step 1 to test clinical knowledge?

   Answer: Step 2 CK

   Why: After Step 1 became pass/fail, Step 2 CK scores became the primary numerical metric used by residency programs.

2. 2 Medium

   How many years do most medical boards give to pass all three USMLE Steps?

   Answer: 7 years

   Why: The USMLE recommends seven years, but each state medical board sets its own limit, counted from your first passed Step.

3. 3 Hard

   How many total questions appear on the USMLE Step 1 exam?

   Answer: 280 questions

   Why: USMLE caps Step 1 at 280 items; since May 2026 they arrive in fourteen 30 minute blocks of no more than 20 questions each.

4. 4 Easy

   What condition causes the classic 'barking seal' cough in children?

   Answer: Croup

   Why: Parainfluenza viruses cause about 75% of cases, and a single dose of dexamethasone eases even mild attacks of the swollen upper airway.

5. 5 Medium

   Which bacterium causes the 'strawberry tongue' appearance in scarlet fever?

   Answer: Streptococcus pyogenes

   Why: Its erythrogenic toxins do the damage: a thick white coating peels off after a few days, leaving the swollen red papillae exposed.

6. 6 Hard

   What enzyme is deficient in patients diagnosed with McArdle disease?

   Answer: Glycogen phosphorylase

   Why: Only the muscle isoform PYGM fails, so cramps ease into a second wind after six to ten minutes as blood glucose fuels the muscle.