About General Science

The General Science section evaluates your understanding of fundamental scientific concepts across multiple disciplines. This includes life science (biology, ecology, human anatomy), physical science (chemistry, physics), and earth and space science (geology, meteorology, astronomy). On the CAT-ASVAB, you will have approximately 8 minutes to answer 15 questions. While this section does not directly contribute to your AFQT score, it is a critical component of several composite line scores including ST (Skilled Technical), EL (Electronics), and GM (General Maintenance), which determine eligibility for many technical military jobs.

Topics Covered

Human Biology & Anatomy
Cell Biology & Genetics
Ecology & Ecosystems
Chemistry Fundamentals
Physics Basics
Earth Science & Geology
Weather & Meteorology
Astronomy & Space Science
Scientific Method
Nutrition & Health

Sample Questions

Sample Question 1
Which planet is known as the Red Planet?
  • Venus
  • Mars
  • Jupiter
  • Saturn
Mars is called the Red Planet due to iron oxide (rust) on its surface giving it a reddish appearance.
Sample Question 2
What is the primary function of mitochondria in cells?
  • Photosynthesis
  • Energy production
  • Protein synthesis
  • Cell division
Mitochondria are the 'powerhouse of the cell' - they produce ATP (energy).
Sample Question 3
What is the speed of light in a vacuum?
  • 300 km/s
  • 300,000 km/s
  • 3,000,000 km/s
  • 30,000 km/s
Light travels at approximately 300,000 kilometers per second (186,000 miles/second).

Study Tips for General Science

Focus on Breadth, Not Depth

The GS section covers many topics at a surface level. Focus on understanding key concepts across all sciences rather than deep-diving into one area.

Use Flashcards for Terminology

Many GS questions test vocabulary and definitions. Create flashcards for scientific terms, especially in biology and chemistry.

Review the Periodic Table Basics

Know the common elements, their symbols, and basic properties. You don't need to memorize the entire table, but understanding groups and periods helps.