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100+ Free OSAS Science Grade 11 Practice Questions

Prepare for the Oregon Statewide Assessment System — Science, Grade 11 exam with instant access — no signup required.

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Key Facts: OSAS Science Grade 11 Exam

ODE

Administering agency

Oregon Department of Education

2022 Oregon Science (NGSS)

Standards

ODE Science Assessment page

High school (Grade 11)

Grade band

OSAS Science Blueprint Summary

Physical / Life / Earth & Space

Reporting categories

OSAS Science Blueprint Summary

90-100 minutes

Approximate testing time

ODE Understanding Your Child's Science Test

Practise for the OSAS Grade 11 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 11 Practice Questions

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

1A neutral atom of chlorine has mass number 35 and 17 protons. How many neutrons and electrons does this atom contain?
A.17 neutrons and 17 electrons
B.18 neutrons and 17 electrons
C.18 neutrons and 18 electrons
D.35 neutrons and 17 electrons
Explanation: The mass number equals protons plus neutrons, so neutrons = 35 − 17 = 18. A neutral atom has electrons equal to protons, so there are 17 electrons.
2Carbon-12 and carbon-14 are isotopes of the same element. Which statement correctly describes how they differ and what they share?
A.They have the same number of neutrons but different numbers of protons
B.They have the same number of protons but different numbers of neutrons
C.They have different numbers of protons and different numbers of electrons
D.They have the same mass number but different numbers of protons
Explanation: Isotopes of an element share the same number of protons (which defines the element) but differ in the number of neutrons, giving them different mass numbers.
3A student builds a model of a sodium atom showing 11 protons and electrons arranged in energy levels of 2, 8, and 1. When sodium forms a stable ion, which best explains the change using the model?
A.Sodium gains 7 electrons to fill its outermost level
B.Sodium loses 1 electron to achieve a full outer level
C.Sodium shares its 1 outer electron with another atom in an ionic bond
D.Sodium gains 1 proton to become magnesium
Explanation: Sodium has one valence electron. Losing that electron leaves the second energy level (8 electrons) as the outermost, which is full and stable. This produces the Na⁺ ion.
4Using the periodic table as a model, which trend correctly describes how atomic radius changes from left to right across a period?
A.Radius increases because atoms gain more neutrons
B.Radius increases because atoms gain more electron shells
C.Radius decreases because increasing nuclear charge pulls electrons closer
D.Radius decreases because electrons are removed from the outer shell
Explanation: Across a period, protons are added to the nucleus while electrons fill the same energy level. The increasing nuclear charge pulls the electron cloud inward, decreasing atomic radius.
5A student records first ionization energies for three elements in the same period: Element X = 496 kJ/mol, Element Y = 738 kJ/mol, Element Z = 1520 kJ/mol. Which conclusion is best supported by this data?
A.Element Z is farthest to the left in the period
B.Element X is a noble gas
C.Element X loses an electron most easily of the three
D.All three elements are in the same group
Explanation: Ionization energy generally increases left to right across a period. Element X has the lowest ionization energy, meaning it requires the least energy to remove an electron, so it loses an electron most easily.
6Which set of coefficients balances the following equation? ? H₂ + ? O₂ → ? H₂O
A.1, 1, 1
B.2, 1, 2
C.2, 2, 2
D.1, 2, 1
Explanation: Counting atoms: 2 H₂ gives 4 hydrogen atoms, 1 O₂ gives 2 oxygen atoms, and 2 H₂O gives 4 hydrogen and 2 oxygen atoms. The coefficients 2, 1, 2 conserve atoms on both sides.
7When propane burns completely, the reaction is: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O Which statement best explains how this equation demonstrates conservation of mass?
A.The total number of molecules is the same on both sides
B.The total number of atoms of each element is the same on both sides
C.The coefficients add up to the same value on both sides
D.The mass of the products is greater than the mass of the reactants
Explanation: Conservation of mass means atoms are neither created nor destroyed. Counting atoms: 3 carbon, 8 hydrogen, and 10 oxygen atoms appear on each side of the balanced equation.
8How many molecules are in 2.0 moles of CO₂? (Avogadro's number = 6.022 × 10²³)
A.3.01 × 10²³ molecules
B.6.02 × 10²³ molecules
C.1.20 × 10²⁴ molecules
D.2.41 × 10²⁴ molecules
Explanation: One mole contains 6.022 × 10²³ molecules. For 2.0 moles: 2.0 × 6.022 × 10²³ = 1.20 × 10²⁴ molecules of CO₂.
9A student has 36.0 g of water (H₂O). The molar mass of H₂O is 18.0 g/mol. How many moles of water does the student have?
A.0.50 mol
B.1.0 mol
C.2.0 mol
D.18.0 mol
Explanation: Moles = mass ÷ molar mass = 36.0 g ÷ 18.0 g/mol = 2.0 mol of water.
10Given the balanced reaction: 2Al + 3Cl₂ → 2AlCl₃ How many moles of Cl₂ are needed to react completely with 4.0 moles of Al?
A.2.0 mol Cl₂
B.3.0 mol Cl₂
C.6.0 mol Cl₂
D.8.0 mol Cl₂
Explanation: The mole ratio from the balanced equation is 2 mol Al : 3 mol Cl₂. For 4.0 mol Al: (3/2) × 4.0 = 6.0 mol Cl₂.

About the OSAS Science Grade 11 Exam

The OSAS Grade 11 Science assessment measures student proficiency against the 2022 Oregon Science Standards (NGSS) for the high school 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 11 covers all high school science standards.

Time Limit

Approximately 90-100 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 11 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 high school 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 11 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 11 covers all high school science standards.
  • Time limit: Approximately 90-100 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 11 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 11 Science test cover?

It measures the high school 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 11 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 11 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 Grade 11 window for ELA, Mathematics and Science runs February 2, 2027 through June 11, 2027.