100+ Free Washington Comprehensive Assessment of Science (WCAS) Grade 11 Practice Questions

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2026 Statistics

Key Facts: Washington Comprehensive Assessment of Science (WCAS) Grade 11 Exam

OSPI

State Agency

Washington Office of Superintendent of Public Instruction

Cambium Assessment, Inc.

Test Provider

OSPI WCAP Portal

45 score points

Total Points

WCAS High School Test Design and Item Specifications (2026)

Scale score 700 (Level 3)

Meets Standard

OSPI Scale Scores for State Assessments

Untimed (~120 min scheduled)

Testing Time

WCAS High School Test Design and Item Specifications (2026)

Removed by HB 1599 (2019)

Graduation Requirement

OSPI WCAS overview page

English and full Spanish translation

Languages

OSPI Guidelines on Tools, Supports, and Accommodations

100 practice questions

Practice Bank Size

OpenExamPrep

Prepare for the Washington WCAS Science Grade 11 assessment with 100 practice questions weighted to the official 45-point blueprint (Physical 36%, Life 36%, Earth and Space 28%), each with a full explanation.

Sample Washington Comprehensive Assessment of Science (WCAS) Grade 11 Practice Questions

Try these sample questions to test your Washington Comprehensive Assessment of Science (WCAS) Grade 11 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1How does increasing the concentration of hydrochloric acid affect its reaction rate with zinc metal chips?

A.It increases the reaction rate by increasing the frequency of collisions between reactant particles.

B.It decreases the reaction rate by lowering the temperature of the acid solution.

C.It stops the reaction by destroying all zinc atoms immediately.

D.It has zero effect on the reaction rate.

Explanation: According to collision theory, increasing reactant concentration increases collision frequency between reactant molecules per unit time, thereby accelerating reaction rate.

2Consider the reversible exothermic synthesis of ammonia: N2(g) + 3 H2(g) <=> 2 NH3(g) + Heat. If the temperature of the equilibrium system is increased, how will the reaction respond according to Le Chatelier's principle?

A.The equilibrium will shift to the left (toward reactants N2 and H2) to absorb added thermal energy.

B.The equilibrium will shift to the right (toward product NH3) to generate more heat.

C.The equilibrium position will remain completely unaffected.

D.The reaction will produce solid nitrogen crystals.

Explanation: Le Chatelier's principle states that if a dynamic equilibrium is disturbed by changing conditions (temperature, pressure, concentration), the position of equilibrium shifts to counteract the change. For an exothermic reaction (heat is a product), increasing temperature shifts equilibrium to the left toward reactants.

3A 1,200-kg car traveling east at 15 m/s collides head-on with an identical 1,200-kg car traveling west at 15 m/s. The cars lock bumpers and come to a complete stop. What was the total vector momentum of the system right before the collision?

A.0 kg·m/s.

B.36,000 kg·m/s east.

C.18,000 kg·m/s west.

D.72,000 kg·m/s north.

Explanation: Conservation of linear momentum (p = m v) states that total momentum before a collision equals total momentum after a collision in an isolated system (F_net = 0).

4During protein synthesis, a cell transcribes a DNA sequence 3'-TAC GGC TTA-5' into messenger RNA. What is the complementary sequence of the mRNA transcript produced?

A.5'-AUG CCG AAU-3'.

B.5'-ATG CCG AAT-3'.

C.5'-UAC GGC UUA-3'.

D.5'-GCA TTA CCG-3'.

Explanation: Transcription occurs in the cell nucleus, copying a DNA template strand into messenger RNA (mRNA). Translation occurs in the cytoplasm at ribosomes, converting mRNA codons into an amino acid polypeptide chain.

5How do biological enzymes increase the rate of metabolic reactions inside living cells?

A.By lowering the activation energy barrier required for the reaction to occur.

B.By raising the total thermal energy of the cell by 50°C.

C.By permanently changing the chemical identity of final product atoms.

D.By consuming ATP energy to destroy water molecules.

Explanation: Enzymes lower the activation energy (E_a) required for a chemical reaction to proceed, thereby accelerating the reaction rate without being consumed in the process.

6In a population of wildflowers in Hardy-Weinberg equilibrium, the frequency of the recessive white-flower allele (q) is 0.3. What percentage of the population is expected to be heterozygous (2pq) for flower color?

A.42%.

B.9%.

C.49%.

D.70%.

Explanation: Hardy-Weinberg equilibrium describes a non-evolving population where allele frequencies remain constant. Conditions: no mutations, random mating, no gene flow, infinite population size, and no natural selection (p² + 2pq + q² = 1).

7Where are stable stars that fuse hydrogen into helium in their cores (such as our Sun) located on a Hertzsprung-Russell (H-R) diagram?

A.Along the diagonal Main Sequence band.

B.In the White Dwarf lower-left region.

C.In the Red Supergiant top-right corner.

D.In the Black Hole center singularity.

Explanation: The Hertzsprung-Russell (H-R) diagram plots stellar luminosity against surface temperature (spectral class). Main sequence stars fuse hydrogen into helium in their cores. Supergiants occupy the upper right region.

8According to Kepler's Third Law of Planetary Motion, how does the orbital period of a planet change as its average distance (radius) from the Sun increases?

A.The orbital period increases because T² is proportional to r³.

B.The orbital period decreases because gravity pulls faster at greater distances.

C.The orbital period remains constant regardless of distance.

D.The orbital period drops to zero.

Explanation: Kepler's Third Law of Planetary Motion states that the square of a planet's orbital period (T²) is directly proportional to the cube of its semi-major axis orbital radius (r³): T² ∝ r³.

9Which flux in the global carbon cycle removes carbon dioxide gas directly from the atmosphere and stores it in the biosphere?

A.Photosynthesis by terrestrial forests and oceanic phytoplankton.

B.Combustion of coal and crude oil.

C.Volcanic degassing of magma.

D.Cellular respiration by animals.

Explanation: Earth's carbon cycle involves carbon reservoirs: atmosphere (CO2), biosphere (organic biomass), hydrosphere (dissolved carbonate ions), and geosphere (fossil fuels, limestone rock). Combustion and respiration release CO2; photosynthesis absorbs CO2.

10A team of environmental engineers designs a battery energy storage facility for a Washington wind farm. Lithium-ion batteries offer high energy density (criterion) but present thermal runaway fire risks (constraint). Flow batteries have lower energy density but zero fire risk. How should engineers evaluate the options?

A.Perform a multi-criteria trade-off matrix balancing energy density, safety risk, lifecycle cost, and environmental impact.

B.Select lithium-ion batteries and disable all thermal safety monitoring.

C.Select flow batteries and claim energy density is mathematically irrelevant.

D.Cancel the energy storage project.

Explanation: Engineering design requirements specify criteria (performance benchmarks) and constraints (cost, safety, regulations, material availability, environmental impacts). Trade-off analysis optimizes system design.

About the Washington Comprehensive Assessment of Science (WCAS) Grade 11 Exam

The Washington Comprehensive Assessment of Science (WCAS) Grade 11 measures student proficiency on the high school band of the 2013 Washington K–12 Science Learning Standards (Next Generation Science Standards). It assesses all three dimensions across Physical Sciences (chemistry, forces, energy, waves), Life Sciences (molecular biology, genetics, ecosystems, evolution), and Earth and Space Sciences (astronomy, Earth systems, climate and sustainability), with Engineering Design bundled into at least one item cluster. The 45-point fixed-form test is administered online each spring through the WCAP Portal. House Bill 1599 (2019) removed the high school science assessment graduation requirement, but the test remains required for federal and state accountability. This 100-question practice bank provides four-option MCQs with detailed explanations as an English-language study adaptation.

Assessment

Untimed online fixed-form state assessment (about 120 minutes of testing time; roughly 150 minutes total administration including directions), given in one to three sessions. Phenomena-based item clusters and standalone items use multiple choice, multiple select, edit-task inline choice, hot text, grid interaction, table match, table input, simulation, and human-scored short answer. Approximately one third of the points are anchor items carried over from previous years, and a scientific calculator and periodic table are embedded. Delivered through the WCAP Portal (Cambium Assessment, Inc.) and aligned to the high school band of the 2013 Washington K–12 Science Learning Standards. This local bank contains 100 English four-option practice MCQs.

Time Limit

Untimed (about 120 minutes of testing time; ~150 minutes total administration)

Passing Score

No pass/fail score. Scale score 390–1190 with four levels: Level 1 390–649, Level 2 650–699, Level 3 (meets standard) 700–790, Level 4 791–1190.

Exam Fee

No fee to students (Washington Office of Superintendent of Public Instruction (OSPI))

Washington Comprehensive Assessment of Science (WCAS) Grade 11 Exam Content Outline

36% (14–18 of 45 points)

Physical Sciences

Atomic structure and periodic trends, chemical reactions and stoichiometry, thermodynamics and equilibrium, nuclear processes, forces and momentum, energy conservation, and electromagnetic radiation.

36% (14–18 of 45 points)

Life Sciences

DNA structure, transcription and translation, cellular energy, homeostasis and feedback, inheritance and variation, ecosystem dynamics and carrying capacity, and evidence for evolution.

28% (11–15 of 45 points)

Earth and Space Sciences

Stellar evolution and the Big Bang, orbital motion, radiometric dating and Earth history, plate tectonics and mantle convection, climate feedbacks and the carbon cycle, and natural resources and hazards.

Bundled (points not specified)

Engineering, Technology, and Applications of Science

HS-ETS1 global-challenge analysis, prioritized criteria and trade-offs, breaking down complex problems, and computer simulation, bundled with a science domain inside at least one item cluster.

How to Pass the Washington Comprehensive Assessment of Science (WCAS) Grade 11 Exam

What You Need to Know

Passing score: No pass/fail score. Scale score 390–1190 with four levels: Level 1 390–649, Level 2 650–699, Level 3 (meets standard) 700–790, Level 4 791–1190.
Assessment: Untimed online fixed-form state assessment (about 120 minutes of testing time; roughly 150 minutes total administration including directions), given in one to three sessions. Phenomena-based item clusters and standalone items use multiple choice, multiple select, edit-task inline choice, hot text, grid interaction, table match, table input, simulation, and human-scored short answer. Approximately one third of the points are anchor items carried over from previous years, and a scientific calculator and periodic table are embedded. Delivered through the WCAP Portal (Cambium Assessment, Inc.) and aligned to the high school band of the 2013 Washington K–12 Science Learning Standards. This local bank contains 100 English four-option practice MCQs.
Time limit: Untimed (about 120 minutes of testing time; ~150 minutes total administration)
Exam fee: No fee to students

Keys to Passing

Work through all 100 available questions
Review every answer and explanation
Track weak areas and revisit them
Use our AI tutor for tough concepts

Washington Comprehensive Assessment of Science (WCAS) Grade 11 Study Tips from Top Performers

1Master using Le Chatelier's principle to predict how equilibrium shifts with temperature, pressure, and concentration.

2Understand how transcription (DNA to mRNA) and translation (mRNA to protein) express genes.

3Analyze feedback loops (positive vs negative) in Earth's climate system and in human physiology.

4Apply conservation of momentum and conservation of energy to multi-object collisions.

5Work through the free OSPI Grade 11 training test on the WCAP Portal so the cluster and technology-enhanced item tools are familiar.

Frequently Asked Questions

What is the WCAS Grade 11 test?

It is the Washington statewide science assessment for 11th grade students, covering the high school band of the Washington science standards. It is required for federal and state accountability and is administered online each spring.

What score is required for Level 3 on WCAS Grade 11?

A scale score of 700 or higher places a student at Level 3 (meets standard) or Level 4 (exceeds standard). The WCAS is not pass/fail; scores are reported on a 390–1190 scale with four achievement levels.

Is the WCAS required to graduate in Washington?

No. House Bill 1599 (2019) removed the high school science assessment graduation requirement. Grade 11 students still take the WCAS for accountability, and grade 12 students may take it when a district requires a score for credit retrieval or recovery.

How long is the WCAS Grade 11 test?

It is untimed. OSPI schedules about 120 minutes of testing time — 105 minutes for the operational form plus 15 minutes for embedded field-test items — and the test may be split across one to three sessions.

How many questions are on the Grade 11 WCAS?

OSPI does not publish an item count. The blueprint is 45 score points delivered as six item clusters plus six to twelve standalone items, plus embedded field-test items that do not count toward the score.

Is this practice bank official?

No. It is an independent 100-question English-language MCQ bank built from the public Washington science standards and the published WCAS blueprint, not an official OSPI product or a simulation of the real item types.