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100+ Free OSAS Science Grade 5 Practice Questions

Prepare for the Oregon Statewide Assessment System — Science, Grade 5 exam with instant access — no signup required.

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2026 Statistics

Key Facts: OSAS Science Grade 5 Exam

ODE

Administering agency

Oregon Department of Education

2022 Oregon Science (NGSS)

Standards

ODE Science Assessment page

Grades 3-5

Grade band

OSAS Science Blueprint Summary

Physical / Life / Earth & Space

Reporting categories

OSAS Science Blueprint Summary

75-85 minutes

Approximate testing time

ODE Understanding Your Child's Science Test

Practise for the OSAS Grade 5 Science test with 100 free questions weighted across Physical, Life, and Earth and Space Science. The real test uses three-dimensional, phenomenon-based clusters and stand-alone items; this English-language MCQ bank is a study aid, not an official form.

Sample OSAS Science Grade 5 Practice Questions

Try these sample questions to test your OSAS Science Grade 5 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A student places 50 grams of baking soda and 100 grams of vinegar in a sealed plastic bag on a balance. The total mass reads 150 grams. After the substances mix and the bag inflates with gas, the student reads the balance again. What is the most likely total mass?
A.Less than 150 grams, because gas is lighter than liquid
B.150 grams, because matter is not created or destroyed in a closed system
C.More than 150 grams, because a new substance was made
D.Zero grams, because the bag is full of gas
Explanation: When substances react in a sealed (closed) container, the total mass stays the same because no matter enters or leaves. The gas is still trapped inside the bag, so the balance still reads 150 grams. This is an example of the law of conservation of matter.
2A student records the mass of an ice cube as 25 grams. After the ice melts into liquid water, the student measures the mass of the water. Which result best supports the idea that melting is a physical change that conserves matter?
A.The water has a mass of about 25 grams
B.The water has a mass of about 50 grams, because liquid is heavier than solid
C.The water has a mass of about 10 grams, because some matter was lost
D.The water has a mass of 0 grams, because ice turns into nothing
Explanation: Melting is a physical change — the water changes from solid to liquid, but no matter is added or removed. The mass of the liquid water should be about the same as the mass of the ice cube, 25 grams. This shows that matter is conserved during a change of state.
3A student observes four changes. Which observation provides the best evidence that a chemical change has occurred?
A.A piece of chalk is broken into smaller pieces
B.An ice cube melts into a puddle on a table
C.A steel nail left outside forms reddish-brown rust over several days
D.Sugar dissolves in warm water, making the water taste sweet
Explanation: Rust forming on a steel nail is a chemical change because a new substance (rust) is produced that has different properties from the original steel. Breaking chalk, melting ice, and dissolving sugar are physical changes — the original substance is still the same, just in a different form.
4A student stirs a spoonful of sugar into a glass of water. The sugar seems to disappear, but the water tastes sweet. Using the particle model of matter, which explanation best describes what happened to the sugar?
A.The sugar particles were destroyed by the water
B.The sugar particles spread out and mixed with the water particles, becoming too small to see
C.The sugar particles changed into water particles
D.The sugar particles evaporated into the air instantly
Explanation: Matter is made of tiny particles too small to see. When sugar dissolves, its particles separate and spread evenly among the water particles. The sugar is still there — the sweet taste is evidence — but the individual particles are too small to see without magnification.
5An astronaut has a mass of 60 kilograms on Earth. The astronaut travels to the Moon, where gravity is weaker. Which statement is correct?
A.The astronaut's mass and weight both stay the same on the Moon
B.The astronaut's mass stays the same, but the weight decreases on the Moon
C.The astronaut's mass decreases, but the weight stays the same on the Moon
D.Both the astronaut's mass and weight decrease on the Moon
Explanation: Mass is the amount of matter in an object and does not change with location. Weight is a measure of the gravitational force pulling on an object, so it changes depending on the strength of gravity. Because the Moon has weaker gravity than Earth, the astronaut's weight decreases on the Moon while mass stays 60 kilograms.
6A student has four objects and measures a property of each: | Object | Density (g/cm³) | Magnetism | Conducts electricity? | |--------|-----------------|-----------|----------------------| | W | 7.8 | Yes | Yes | | X | 1.0 | No | No | | Y | 2.7 | No | Yes | | Z | 0.9 | No | No | Based on the data, which object is most likely made of iron?
A.Object W, because iron is magnetic, dense, and conducts electricity
B.Object X, because iron floats in water
C.Object Y, because iron is lightweight and does not stick to magnets
D.Object Z, because iron is less dense than water
Explanation: Iron is a metal that is magnetic, relatively dense (about 7.8 g/cm³), and conducts electricity. Object W matches all three properties. Analyzing measurable properties helps identify unknown materials. Object X is likely water, and Object Z is less dense than water, which iron is not.
7A student burns a log in a fireplace. After the fire, only a small pile of ash remains. The ash weighs much less than the original log. The student concludes that matter was destroyed. Why does this observation NOT violate the law of conservation of matter?
A.The law of conservation of matter only applies to closed containers, not fireplaces
B.Smoke, gases, and water vapor escaped into the air, and the ash plus all escaped matter equals the original mass
C.Fire destroys matter, which is an exception to the law of conservation of matter
D.The ash actually weighs the same as the log, but it is hard to measure
Explanation: A fireplace is an open system, so gases, smoke, and water vapor produced by burning escape into the air and are not measured. If you could collect all the ash, smoke, and gases, the total mass would equal the mass of the original log plus the oxygen used. Matter is conserved even when it cannot all be collected.
8A student needs to find the mass of a small rock. Which tool and unit are most appropriate for this measurement?
A.A ruler measured in centimeters
B.A graduated cylinder measured in milliliters
C.A pan balance measured in grams
D.A thermometer measured in degrees Celsius
Explanation: Mass is a measure of the amount of matter in an object. A pan balance (or electronic balance) measures mass in grams, which is the appropriate tool and unit for finding the mass of a small rock. A ruler measures length, a graduated cylinder measures volume, and a thermometer measures temperature.
9A student pours 200 mL of water (mass = 200 g) into a beaker. Then the student adds 50 g of salt and stirs until the salt dissolves. What is the total mass of the saltwater mixture?
A.150 grams
B.200 grams
C.250 grams
D.300 grams
Explanation: When salt dissolves in water, the total mass of the mixture equals the mass of the water plus the mass of the salt: 200 g + 50 g = 250 g. Dissolving is a physical change, so matter is conserved. The salt particles are still in the water even though they cannot be seen.
10A ball is dropped from the top of a building. Which statement best describes the direction of the gravitational force that Earth exerts on the ball?
A.The force pulls the ball sideways toward the nearest wall
B.The force pulls the ball downward, toward the center of Earth
C.The force pushes the ball upward, away from Earth
D.The force pulls the ball in all directions equally
Explanation: Earth's gravitational force pulls all objects downward, which means toward the center of the spherical Earth. This is why dropped objects fall down no matter where you are on the planet. The direction we call 'down' always points toward Earth's center.

About the OSAS Science Grade 5 Exam

The OSAS Grade 5 Science assessment measures student proficiency against the 2022 Oregon Science Standards (NGSS) for the grades 3-5 band. It is reported across three categories — Physical Science, Life Science, and Earth and Space Science — through three-dimensional, phenomenon-based items.

Assessment

Online adaptive assessment of three-dimensional items organized as phenomenon-based item clusters and stand-alone items. Reporting categories are Physical Science, Life Science, and Earth and Space Science (roughly one-third each), with engineering design integrated across all three. Each item combines a Disciplinary Core Idea (DCI), a Science and Engineering Practice (SEP), and a Crosscutting Concept (CCC). Aligned to the 2022 Oregon Science Standards (NGSS); Grade 5 covers the grades 3-5 standards.

Time Limit

Approximately 75-85 minutes; untimed within the statewide window

Passing Score

No pass/fail mark. Results are reported on four achievement levels (Levels 1-4); Levels 3 and 4 are considered proficient.

Exam Fee

No fee to students (Oregon Department of Education (ODE); Oregon-developed science assessment aligned to NGSS)

OSAS Science Grade 5 Exam Content Outline

Approximately 33%

Physical Science

Matter and its interactions, motion and stability, energy, and waves — assessed three-dimensionally with science and engineering practices and crosscutting concepts.

Approximately 33%

Life Science

Structures and processes, ecosystems, heredity, and biological evolution — assessed three-dimensionally across the grades 3-5 band.

Approximately 33%

Earth and Space Science

Earth's place in the universe, Earth's systems, weather and climate, and human impacts — with engineering design integrated across the disciplines.

How to Pass the OSAS Science Grade 5 Exam

What You Need to Know

  • Passing score: No pass/fail mark. Results are reported on four achievement levels (Levels 1-4); Levels 3 and 4 are considered proficient.
  • Assessment: Online adaptive assessment of three-dimensional items organized as phenomenon-based item clusters and stand-alone items. Reporting categories are Physical Science, Life Science, and Earth and Space Science (roughly one-third each), with engineering design integrated across all three. Each item combines a Disciplinary Core Idea (DCI), a Science and Engineering Practice (SEP), and a Crosscutting Concept (CCC). Aligned to the 2022 Oregon Science Standards (NGSS); Grade 5 covers the grades 3-5 standards.
  • Time limit: Approximately 75-85 minutes; untimed within the statewide window
  • 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

OSAS Science Grade 5 Study Tips from Top Performers

1Practise reading a phenomenon and identifying which Disciplinary Core Idea, Science and Engineering Practice, and Crosscutting Concept apply — every OSAS Science item is three-dimensional.
2Cover all three reporting categories evenly: Physical, Life, and Earth and Space Science each make up about a third of the test.
3Work with data — interpreting tables, graphs, and models is central to the Science and Engineering Practices.
4Connect science ideas to real-world Oregon phenomena such as wildfires, rivers, and tides to strengthen Earth and Life Science contexts.
5Try the free OSAS Science sample test on the OSAS Portal, including the Spanish/English toggle, so the online tools are familiar.

Frequently Asked Questions

What does the OSAS Grade 5 Science test cover?

It measures the grades 3-5 Oregon Science Standards (NGSS) across three reporting categories: Physical Science, Life Science, and Earth and Space Science, each roughly one-third of the test, with engineering integrated throughout.

Is the OSAS Grade 5 Science test all multiple choice?

No. The official test uses three-dimensional, phenomenon-based item clusters and stand-alone items, each combining a Disciplinary Core Idea, a Science and Engineering Practice, and a Crosscutting Concept. The 100 questions on this page are a four-option MCQ study adaptation and do not simulate the official item types.

Is there a passing score?

No. Results are reported on four achievement levels (Levels 1-4); Levels 3 and 4 are considered proficient.

Is the Grade 5 Science test available in Spanish?

Yes. OSAS Science offers a Spanish/English toggle so a student can switch between languages; Braille is also available.

When is the test given?

Each spring. For 2026-27 the Grades 5 and 8 Science window runs March 2, 2027 through June 11, 2027.