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 — free, no sign-up.

1. Which part of the electromagnetic spectrum do cell phones primarily use to send and receive signals? → Radio waves and microwaves
2. According to the law of reflection, when a light ray bounces off a flat mirror, the angle of incidence equals: → The angle of reflection
3. Which of the following is an example of a chemical change? → A bicycle frame rusting over time.
4. Which property of a mechanical wave is most directly related to the amount of energy the wave carries? → Amplitude
5. A student observes several phenomena in a lab. Which of the following observations most strongly indicates that a chemical reaction has occurred? → The temperature of a mixture decreases as two liquids are combined.
6. What type of rock is formed from the cooling and solidification of magma or lava? → Igneous
7. Which term describes the characteristics that help organisms survive or reproduce in their environment? → Adaptation
8. How do digital communication devices encode and transmit information using waves? → By encoding data as binary patterns in wave signals
9. Which statement accurately describes the relationship between genes, chromosomes, and DNA? → Genes are segments of DNA, which is tightly coiled to form chromosomes.
10. What type of weathering involves the physical breakdown of rocks into smaller pieces without changing their chemical composition? → Mechanical weathering
11. Which of the following is NOT a type of plate boundary? → Perpendicular boundary
12. Medical ultrasound imaging works by: → Sending high-frequency sound waves into the body and detecting echoes
13. What term describes an inherited behavior that an organism can perform without ever learning how to do it? → Instinct
14. A model of a water molecule (H₂O) is shown to a student. Which statement accurately describes the atomic composition of this molecule? → It is composed of two hydrogen atoms and one oxygen atom.
15. Which term describes a behavior that is learned through practice? → Habit
16. Which of the following is the best definition of a biological adaptation? → A heritable trait that increases an organism's fitness in its specific environment.
17. Which of the following statements BEST describes the primary role of genetic mutation in the process of evolution? → Mutations are the ultimate source of new genetic variation in a population.
18. How does increasing the frequency of electromagnetic radiation affect the energy carried by each photon? → Energy increases as frequency increases
19. What property of a wave is defined as the number of complete wave cycles that pass a given point per second? → Frequency
20. Which term describes the variable in an experiment that is intentionally changed or manipulated? → Manipulated variable
21. Which of the following describes a density-independent limiting factor that could affect a population of deer in a forest? → A sudden, severe forest fire that burns a large area.
22. Which equation correctly describes the relationship between wave speed (v), frequency (f), and wavelength (λ)? → v = f × λ
23. Which of the following is the primary source of energy that drives the Earth's water cycle, causing evaporation and transpiration? → Solar radiation from the Sun
24. What term describes the factors that are kept constant in an experiment each time it is tested? → Controlled variables
25. Which of the following types of waves requires a medium to travel through? → Sound waves
26. Which wave behavior allows waves to bend around the edges of obstacles or openings? → Diffraction
27. In fiber optic communication cables, information is transmitted using: → Pulses of light waves
28. Which term describes the physical or behavioral traits that develop during an organism's life in response to environmental factors? → Acquired characteristic
29. 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: → Electrical energy into light and thermal energy.
30. According to the law of conservation of energy, which of the following statements is true? → The total amount of energy in an isolated system remains constant over time.