What the ASVAB Paragraph Comprehension section tests
Paragraph Comprehension (PC) has 11 questions on the CAT-ASVAB. You read short passages — usually 4–8 sentences — and answer questions about them. Main idea questions are the most common type.
The challenge isn't reading speed. It's precision: knowing the difference between the main idea and a supporting detail.
What "main idea" means
The main idea is what the entire passage is arguing, describing, or explaining. Every sentence in the passage should connect to it. If a sentence doesn't connect, it's probably a detail.
Here's a useful test: if you removed the "main idea" answer choice from the passage, would the passage fall apart? It should. That's how you know it's the controlling idea.
Sample passage
Every branch of the military has its own physical fitness standards, but all share a common goal: ensuring service members can perform under physical stress. The Army emphasizes endurance with two-mile run requirements. The Navy focuses on swim readiness. The Marines set some of the most demanding standards across all categories. Despite these differences, the purpose behind every test is the same — operational readiness.
Main idea: Military fitness standards vary by branch but exist for one shared purpose — operational readiness.
Notice what that answer does: it acknowledges the variation (detail), then explains why it matters (the controlling idea). Answers that only cover one branch would be too narrow. An answer like "fitness is important" would be too vague.
The two wrong answer traps
Too narrow — picks one supporting fact. "The Marines have demanding standards" is true but doesn't cover the whole passage.
Too broad — goes beyond what the passage says. "Military training is comprehensive" drags in ideas the passage never makes.
The right answer fits like a lid on the passage — snug, not loose, not forced.
Practice move
After reading a passage, cover the answer choices and write one sentence summarizing the passage in your own words. Then uncover the choices and match. You'll find the correct answer almost immediately.