106+ Free Washington Comprehensive Assessment of Science (WCAS) Grade 5 Practice Questions

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2026 Statistics

Key Facts: Washington Comprehensive Assessment of Science (WCAS) Grade 5 Exam

OSPI

State Agency

Washington Office of Superintendent of Public Instruction

Cambium Assessment, Inc.

Test Provider

OSPI WCAP Portal

35 score points

Total Points

WCAS Grade 5 Test Design and Item Specifications (2026)

Scale score 700 (Level 3)

Meets Standard

OSPI Scale Scores for State Assessments

Untimed (~90 min scheduled)

Testing Time

WCAS Grade 5 Test Design and Item Specifications (2026)

April 6 – June 5, 2026 online

2026 Window

OSPI State Testing Timelines and Calendar

English and full Spanish translation

Languages

OSPI Guidelines on Tools, Supports, and Accommodations

106 practice questions

Practice Bank Size

OpenExamPrep

Prepare for the Washington WCAS Science Grade 5 assessment with 106 practice questions weighted to the official 35-point blueprint (Physical 40%, Life 29%, Earth and Space 31%), each with a full explanation.

Sample Washington Comprehensive Assessment of Science (WCAS) Grade 5 Practice Questions

Try these sample questions to test your Washington Comprehensive Assessment of Science (WCAS) Grade 5 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 106+ question experience with AI tutoring.

1A student dissolves a spoonful of sugar into a cup of warm water until the sugar can no longer be seen. Which statement best explains what happened to the sugar?

A.The sugar broke apart into tiny particles that spread out evenly among the water particles.

B.The sugar changed into water particles and ceased to exist as sugar.

C.The sugar dissolved by destroying the water particles at the bottom of the cup.

D.The sugar evaporated out of the cup into the surrounding air.

Explanation: Matter is composed of particles that are too small to be seen with the naked eye. When sugar dissolves in water, the sugar particles separate and disperse evenly throughout the water particles without disappearing or being destroyed.

2A student measures the mass of a sealed jar containing 100 grams of ice cubes. After the ice completely melts into liquid water inside the sealed jar, what will the total mass of the water and jar be?

A.The exact same mass as before the ice melted.

B.Less than before because liquid water is less dense than ice.

C.More than before because liquid water occupies less volume.

D.Zero grams because phase changes destroy mass.

Explanation: According to the principle of conservation of matter, total mass remains constant during physical changes such as phase changes. The mass of ice equals the mass of liquid water produced upon melting in a closed system.

3A student drops a tennis ball from a height of two meters. Which statement correctly describes the force acting on the ball as it falls?

A.Earth's gravity exerts a downward force pulling the ball toward Earth's center.

B.Air pressure pushes the ball down toward the ground.

C.Magnetic forces between the ball and the ground pull the ball down.

D.The ball moves down because it loses all of its internal energy.

Explanation: Earth's gravitational force attracts all objects toward the center of Earth. Regardless of where an object is located on Earth's surface, gravity pulls it downward toward Earth's center.

4A scientist grows a potted plant from a seed in a sealed container with air, light, and water. Over several months, the plant gains 500 grams of mass while the dry soil loses less than 1 gram. Where did the plant get most of the matter for its growth?

A.From carbon dioxide in the air and water absorbed by roots.

B.From solid soil minerals absorbed directly into leaves.

C.From sunlight changing directly into solid matter.

D.From fertilizer particles produced inside the plant stem.

Explanation: Plants use energy from sunlight to synthesize glucose from carbon dioxide (from air) and water (from soil) during photosynthesis. Therefore, plants derive their structural growth materials primarily from air and water rather than soil nutrients.

5Which role in a forest ecosystem food web directly converts light energy from the Sun into chemical energy stored in food?

A.Producers such as evergreen trees and ferns.

B.Primary consumers such as snowshoe hares.

C.Decomposers such as mushrooms and soil bacteria.

D.Apex predators such as cougars and wolves.

Explanation: In an ecosystem, food webs depict energy flow. Producers (plants/algae) capture solar energy, primary consumers eat producers, secondary consumers eat herbivores, and decomposers break down dead matter, recycling nutrients back to the environment.

6The Sun appears much larger and brighter in Earth's sky than distant stars like Rigel or Sirius, even though some distant stars produce much more light. Why does the Sun appear so much brighter?

A.The Sun is much closer to Earth than any other star.

B.The Sun is the only star made of glowing hot gases.

C.The Sun reflects light from Earth's atmosphere back to space.

D.Distant stars only emit light during nighttime hours.

Explanation: The Sun appears brighter than other stars because it is vastly closer to Earth (about 93 million miles) than any other star (the next closest star, Proxima Centauri, is over 24 trillion miles away).

7A student measures the shadow of a flagpole at 8:00 AM, 12:00 PM, and 4:00 PM. What causes the length and position of the flagpole's shadow to change throughout the day?

A.Earth rotating on its axis as it orbits the Sun.

B.The Sun moving closer to and farther from Earth every hour.

C.Earth's distance from the Moon changing throughout the day.

D.Cloud cover altering the speed of light hitting the flagpole.

Explanation: Earth's rotation on its axis once every 24 hours causes the apparent motion of the Sun across the sky from east to west, which changes the angle of sunlight and causes shadow length and direction to change throughout the day.

8Where is the vast majority of Earth's total water supply stored?

A.In oceans as salt water.

B.In freshwater rivers and lakes.

C.In atmospheric water vapor and clouds.

D.In underground aquifers as drinkable fresh water.

Explanation: The majority of Earth's water is salt water stored in oceans (about 97%). Fresh water accounts for only about 3% of Earth's total water, with most fresh water trapped in glaciers and ice caps.

9Rain falls on a rocky mountain slope, soaking into the soil and providing water for pine trees growing there. Which Earth spheres are directly interacting in this example?

A.Hydrosphere, geosphere, and biosphere.

B.Atmosphere and exosphere only.

C.Cryosphere and magnetosphere only.

D.Biosphere and asthenosphere only.

Explanation: Earth's systems consist of four major spheres: geosphere (rock, soil, landforms), hydrosphere (water), atmosphere (air), and biosphere (living organisms). Plants (biosphere) taking root in soil (geosphere) and absorbing rainwater (hydrosphere) demonstrates multi-sphere interaction.

10A student wants to test which shape of paper airplane flies the farthest distance. To make the test fair, which factor should the student change between flights?

A.Only the fold shape of the paper airplane.

B.The paper airplane shape and the type of paper used.

C.The throwing strength, airplane shape, and indoor location.

D.All features of the airplane and flight conditions simultaneously.

Explanation: In an engineering investigation, a fair test requires changing only one variable at a time (the independent variable) while keeping all other variables constant (controlled variables) to determine its exact effect.

About the Washington Comprehensive Assessment of Science (WCAS) Grade 5 Exam

The Washington Comprehensive Assessment of Science (WCAS) Grade 5 measures student proficiency on the grades 3–5 band of the 2013 Washington K–12 Science Learning Standards (Next Generation Science Standards). It assesses all three dimensions — science and engineering practices, disciplinary core ideas, and crosscutting concepts — across Physical Sciences, Life Sciences, Earth and Space Sciences, with Engineering Design bundled into at least one item cluster. The 35-point fixed-form test is administered online each spring through the WCAP Portal using phenomena-based item clusters and standalone items. This 106-question practice bank provides four-option MCQs with detailed explanations as an English-language study adaptation.

Assessment

Untimed online fixed-form state assessment (about 90 minutes of testing time; roughly 120 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. Delivered through the WCAP Portal (Cambium Assessment, Inc.) and aligned to the grades 3–5 band of the 2013 Washington K–12 Science Learning Standards. This local bank contains 106 English four-option practice MCQs.

Time Limit

Untimed (about 90 minutes of testing time; ~120 minutes total administration)

Passing Score

No pass/fail score. Scale score 375–1060 with four levels: Level 1 375–649, Level 2 650–699, Level 3 (meets standard) 700–784, Level 4 785–1060.

Exam Fee

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

Washington Comprehensive Assessment of Science (WCAS) Grade 5 Exam Content Outline

40% (12–16 of 35 points)

Physical Sciences

Particles and properties of matter, conservation of matter, mixing substances, Earth's downward gravitational force, balanced and unbalanced forces, magnetism, energy transfer, and waves and light.

29% (8–12 of 35 points)

Life Sciences

Plant matter from air and water, matter and energy movement among producers, consumers and decomposers, plant and animal structures, information processing, life cycles, and inherited variation.

31% (9–13 of 35 points)

Earth and Space Sciences

Apparent star brightness, daily and seasonal sky patterns, Earth sphere interactions, water distribution, weathering and erosion, weather and climate, and protecting Earth's resources.

Bundled (points not specified)

Engineering, Technology, and Applications of Science

3-5-ETS1 problem definition, comparing solutions, and fair tests, bundled with a science domain inside at least one item cluster.

How to Pass the Washington Comprehensive Assessment of Science (WCAS) Grade 5 Exam

What You Need to Know

Passing score: No pass/fail score. Scale score 375–1060 with four levels: Level 1 375–649, Level 2 650–699, Level 3 (meets standard) 700–784, Level 4 785–1060.
Assessment: Untimed online fixed-form state assessment (about 90 minutes of testing time; roughly 120 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. Delivered through the WCAP Portal (Cambium Assessment, Inc.) and aligned to the grades 3–5 band of the 2013 Washington K–12 Science Learning Standards. This local bank contains 106 English four-option practice MCQs.
Time limit: Untimed (about 90 minutes of testing time; ~120 minutes total administration)
Exam fee: No fee to students

Keys to Passing

Work through all 106 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 5 Study Tips from Top Performers

1Practice identifying evidence that matter is conserved during physical changes and when substances are mixed.

2Trace solar energy from plants to herbivores and carnivores in food chains, and follow matter through decomposers.

3Understand how distance affects the apparent brightness of stars compared to our Sun.

4Identify interactions between the geosphere, hydrosphere, atmosphere, and biosphere in everyday scenarios.

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

Frequently Asked Questions

What is the WCAS Grade 5 test?

It is the Washington Comprehensive Assessment of Science for 5th grade students, measuring proficiency on the grades 3–5 band of the 2013 Washington K–12 Science Learning Standards (NGSS). Participation is required for federal and state accountability.

What score does a Grade 5 student need to meet standard?

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 375–1060 scale with four achievement levels.

How long is the WCAS Grade 5 test?

It is untimed. OSPI schedules about 90 minutes of testing time — 75 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 5 WCAS?

OSPI does not publish an item count. The blueprint is 35 score points delivered as five item clusters plus six to twelve standalone items, plus embedded field-test items that do not count toward the score.

What languages is the WCAS offered in?

English, with a full dual-language Spanish translation shown above the English item as a designated support. Primary-language pop-up glossaries are available in additional languages including Arabic, Russian, Somali, Ukrainian, and Vietnamese.

Is this practice bank affiliated with OSPI?

No. This is an independent English-language MCQ study resource aligned to the public Washington science standards and the published WCAS blueprint. It is not an official translation or a simulation of the real item types.