Practice Test GeeksWCAS - Washington Comprehensive Assessment of Science Practice Test

WCAS Cheat Sheet 2026

The 30 highest-yield WCAS facts, distilled from real exam questions. Print it, save it as a PDF, or study it here โ€” free, no sign-up.

35 questions
120 min time limit
65.00% to pass
  1. Which of the following is an example of a chemical change? โ†’ A bicycle frame rusting over time.
  2. A student observes several phenomena in a lab. Which of the following observations most strongly indicates that a chemical reaction has occurred? โ†’ The temperature of a mixture decreases as two liquids are combined.
  3. What type of rock is formed from the cooling and solidification of magma or lava? โ†’ Igneous
  4. Which term describes the characteristics that help organisms survive or reproduce in their environment? โ†’ Adaptation
  5. Which statement accurately describes the relationship between genes, chromosomes, and DNA? โ†’ Genes are segments of DNA, which is tightly coiled to form chromosomes.
  6. What type of weathering involves the physical breakdown of rocks into smaller pieces without changing their chemical composition? โ†’ Mechanical weathering
  7. Which of the following is NOT a type of plate boundary? โ†’ Perpendicular boundary
  8. What term describes an inherited behavior that an organism can perform without ever learning how to do it? โ†’ Instinct
  9. A model of a water molecule (Hโ‚‚O) is shown to a student. Which statement accurately describes the atomic composition of this molecule? โ†’ It is composed of two hydrogen atoms and one oxygen atom.
  10. Which term describes a behavior that is learned through practice? โ†’ Habit
  11. Which of the following is the best definition of a biological adaptation? โ†’ A heritable trait that increases an organism's fitness in its specific environment.
  12. Which of the following statements BEST describes the primary role of genetic mutation in the process of evolution? โ†’ Mutations are the ultimate source of new genetic variation in a population.
  13. What property of a wave is defined as the number of complete wave cycles that pass a given point per second? โ†’ Frequency
  14. Which term describes the variable in an experiment that is intentionally changed or manipulated? โ†’ Manipulated variable
  15. Which of the following describes a density-independent limiting factor that could affect a population of deer in a forest? โ†’ A sudden, severe forest fire that burns a large area.
  16. Which equation correctly describes the relationship between wave speed (v), frequency (f), and wavelength (ฮป)? โ†’ v = f ร— ฮป
  17. Which of the following is the primary source of energy that drives the Earth's water cycle, causing evaporation and transpiration? โ†’ Solar radiation from the Sun
  18. What term describes the factors that are kept constant in an experiment each time it is tested? โ†’ Controlled variables
  19. Which of the following types of waves requires a medium to travel through? โ†’ Sound waves
  20. Which term describes the physical or behavioral traits that develop during an organism's life in response to environmental factors? โ†’ Acquired characteristic
  21. An incandescent light bulb is switched on. It produces light and also becomes very hot. This scenario is an example of energy being transformed from: โ†’ Electrical energy into light and thermal energy.
  22. According to the law of conservation of energy, which of the following statements is true? โ†’ The total amount of energy in an isolated system remains constant over time.
  23. What type of eclipse occurs when the Moon passes directly between the Earth and the Sun? โ†’ Solar eclipse
  24. Which of the following best defines a 'trade-off' in the context of engineering design? โ†’ A design choice where improving one desired feature necessitates worsening another.
  25. When a wave passes from one medium into another, which wave property always remains unchanged? โ†’ Frequency
  26. What term describes the physical or behavioral traits that are programmed into an organism's DNA and are passed down from parent to offspring? โ†’ Inherited characteristic
  27. Mitochondria are often called the 'powerhouses' of the cell. What is the primary function of mitochondria in both plant and animal cells? โ†’ To break down sugars to release energy in the form of ATP.
  28. Which term best describes the actions or behaviors of an organism that help it survive in its environment? โ†’ Behavioral adaptation
  29. What term describes a change in a gene's structure that results in a variation of an organism? โ†’ Mutation
  30. The amplitude of a wave is best described as: โ†’ The maximum displacement of a medium from its rest position
Turn these facts into recall:
๐Ÿƒ WCAS Flashcards๐Ÿ“š WCAS Study Guide

What Practice Test Geeks adds beyond an AI chat for WCAS

An AI chatbot can quiz you, but it can't reproduce the exam conditions or keep your record. Here you get:

  • A timed, full-length WCAS mock exam โ€” 35 questions in 120 minutes with a 65% pass mark, modeled on the official exam's question count and time limit, followed by a score report broken down by exam domain.
  • A fixed WCAS question bank: the same test every attempt, so your score is comparable from one try to the next instead of changing with every regenerated quiz.
  • Progress saved on your device: completed tests, scores and missed questions stay in My Progress, so you can retake only what you got wrong.
  • WCAS flashcards built from the same question bank.
  • Free WCAS practice tests with the correct answer shown after each question.
Start the Timed WCAS Mock Exam โ†’
Was this helpful?

How this page was made: written with AI tools and published by Nathan Beja, founder of Practice Test Geeks, who is responsible for its content. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy

Sources & references

Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy

  1. ospi.k12.wa.us โ€” Score release, time limit, passing score, exam format, test delivery, test dates ยท verified Oct 2026