Free Practice Questions for the WGU Courses and Certificates Integrated-Physical-Sciences Exam (2026 Updated)

1. **Understanding the Graph**: The graph provided shows the relationship between acceleration (in m/s²) and mass (in kg). The x-axis represents mass, and the y-axis represents acceleration. 2. **Observing the Trend**: The graph shows a decreasing curve, which indicates that as the mass increases, the acceleration decreases. 3. **Newton ' s Second Law of Motion**: According to Newton ' s Second Law of Motion, \( F = ma \), where \( F \) is the force, \( m \) is the mass, and \( a \) is the acceleration. If the net force (\( F \)) is kept constant, then \( a = \frac{F}{m} \). 4. **Inverse Proportionality**: The equation \( a = \frac{F}{m} \) suggests that acceleration \( a \) is inversely proportional to the mass \( m \). This means that if the mass increases, the acceleration decreases proportionally. 5. **Conclusion**: Based on the graph and Newton ' s Second Law, the correct description of the relationship is that mass and acceleration are inversely proportional. **References**: - Newton ' s Second Law of Motion: Basic principle in physics indicating the relationship between force, mass, and acceleration.

In space, particles attract each other due to the force of gravity. This attraction increases as the particles ' mass increases, leading to the accumulation of more matter.

Gravity is a fundamental force that causes objects with mass to be attracted to one another. As particles gather and grow in mass, their gravitational pull becomes stronger, allowing them to attract even more particles.

This process can lead to the formation of larger celestial bodies such as asteroids, comets, planets, or stars. References:

Integrated Physical Sciences resources on gravitational forces and celestial body formation.

In the reaction between hydrogen and oxygen to form water, the law of conservation of matter dictates that the total mass of the reactants (hydrogen and oxygen) must equal the total mass of the product (water). This is because mass cannot be created or destroyed in a chemical reaction. Thus, the combined mass of hydrogen and oxygen before the reaction will be equal to the mass of water produced after the reaction.

References:

Integrated Physical Sciences materials on chemical reactions and mass conservation.

Standard principles in chemistry related to the law of conservation of mass.

The scenario describes a geothermal energy system. Geothermal energy harnesses the heat from the Earth ' s interior to generate steam, which can then be used to produce electricity or provide direct heating. In this case, underground pipes circulate water that is heated by the Earth ' s internal heat, turning it into steam to generate heat for a building. References :

U.S. Department of Energy (DOE) Geothermal Technologies Office

" Geothermal Energy: Clean Power from the Earth’s Heat " - National Renewable Energy Laboratory (NREL)

Iceland is located on the Mid-Atlantic Ridge, where the North American and Eurasian tectonic plates are diverging. This divergent plate boundary is characterized by the formation of new crust as magma rises from below the Earth ' s surface, leading to frequent volcanic activity. Additionally, as the plates move apart, the stress can cause significant seismic activity, resulting in earthquakes. Therefore, Iceland experiences both high volcanic and earthquake activity due to its tectonic setting.

References:

Integrated Physical Sciences documents on plate tectonics and natural hazards.

Geological studies on the Mid-Atlantic Ridge and Iceland ' s tectonic activity.

*Understand the claim:** In 2011, scientists observed neutrinos that appeared to travel faster than light, which would contradict Einstein’s theory of special relativity. - **Scientific principles:** Einstein’s theory of special relativity has been extensively validated and is a cornerstone of modern physics. Any claim that contradicts it requires thorough investigation. - **Appropriate response:** The scientific method dictates that extraordinary claims require extraordinary evidence. The first step should be to check the experimental setup for errors or anomalies that could explain the unexpected results. - **Replication:** Independent replication of the experiment is essential to confirm or refute the findings. If other scientists can replicate the results under controlled conditions, the claim gains credibility. Otherwise, the initial results are likely due to experimental errors. - **Conclusion:** The best approach is to critically evaluate the experiment and attempt to replicate the results, ensuring the integrity of the scientific process. **References:** Peer-reviewed journals on particle physics, reports from CERN, and documentation on the principles of the scientific method.

An observational study involves collecting data without manipulating any variables. The question " What is the brightest star that can be seen from Earth? " fits this criteria as it involves observing and recording data about stars without any experimental intervention. Other options involve controlled experiments where variables are manipulated. References:

Integrated Physical Sciences, Chapter 2: Methods of Scientific Investigation

Wave propagation: Waves can travel through different mediums. Some waves, like sound and water waves, require a medium to propagate.

Vacuum travel: Electromagnetic waves, including radio waves, can travel through a vacuum. This is because they do not require a medium; they propagate through the oscillation of electric and magnetic fields.

Conclusion: The type of wave that can travel through a vacuum is a radio wave.

References: Integrated Physical Sciences materials on wave propagation, properties of electromagnetic waves, differences between mechanical and electromagnetic waves.

As comets approach the Sun, the increased solar radiation causes the ice within the comet to evaporate (a process called sublimation), releasing gas and dust particles. This creates a visible atmosphere called a coma, and the solar wind then blows this material away from the comet, forming a tail. The tail always points away from the Sun due to the force of the solar wind. References :

NASA’s Comet Exploration Missions

" Cometary Physics " - European Space Agency Publications

Gravity is the force that accelerates a skydiver towards the ground after they jump from a plane. In this scenario, gravity causes a significant change in the motion of the skydiver, pulling them downward and increasing their velocity until air resistance balances the force of gravity. References:

Integrated Physical Sciences, Chapter 3: Forces and Motion

Commercial airline pilots primarily fly in the lower stratosphere and upper troposphere to avoid turbulence and ensure smooth flight conditions.

The troposphere is where weather phenomena and turbulence are common, so pilots seek stable conditions typically found at the boundary with the stratosphere.

The stratosphere offers stable atmospheric conditions, ideal for cruising altitudes. References:

Integrated Physical Sciences materials on atmospheric layers and aviation.

In the solid state of matter, particles are closest together. This is due to the fact that solids have a definite shape and volume, meaning the particles are tightly packed in a fixed, orderly arrangement. In comparison:

Liquids have particles that are close together but not in a fixed position, allowing them to flow.

Gases have particles that are far apart and move freely.

Plasma consists of ionized particles and is not typically considered in the context of ordinary matter states at standard conditions.

References:

Integrated Physical Sciences Learning Resources, Chapter on States of Matter

1. **Wave Propagation in Different Media**: The speed at which waves travel depends on the properties of the medium they are traveling through. 2. **Speed of Sound**: Sound waves travel faster in water than in air because water molecules are closer together than air molecules, allowing sound waves to transmit more efficiently. 3. **Comparison with Other Waves**: - **Visible Light Waves**: Travel faster in air than in water. - **Radio Waves**: Also travel faster in air than in water. - **Gamma Waves**: Travel at the speed of light and are less affected by the medium. 4. **Conclusion**: Among the given options, sound waves are the type of waves that travel faster through water than through air. **References**: - Wave Propagation Characteristics: The behavior of different types of waves in various media.

When a scientist’s results differ significantly from those reported by others, the appropriate action is to perform the experiment again. Repeating the experiment helps to ensure that the results are accurate and reliable. It allows the scientist to verify their findings and check for any possible errors in the experimental process. References:

Integrated Physical Sciences, Chapter 2: Methods of Scientific Investigation

The statement that if the distance between a light source and an observer is doubled, the intensity of the light decreases by a factor of four, describes a consistent, repeatable observation that has been confirmed through numerous experiments. This describes a scientific law, specifically the inverse square law of light. A law summarizes a pattern found in nature, whereas a hypothesis is an untested prediction, a theory is a well-substantiated explanation, and an inference is a conclusion drawn from evidence. References:

Integrated Physical Sciences, Chapter 4: Scientific Laws and Theories

Newton’s discovery that when one object applies a force to another, the second object applies an equal force back is known as Newton ' s third law of motion. This statement is a scientific law because it describes a fundamental and consistent principle observed in nature. It has been validated through numerous experiments and observations. References:

Integrated Physical Sciences, Chapter 4: Scientific Laws and Theories

When a man hits a ball directly upward with a stick, the kinetic energy imparted to the ball is converted into gravitational potential energy as the ball rises. As the ball reaches its highest point, its kinetic energy decreases to zero, and all of its energy is stored as gravitational potential energy. References:

Integrated Physical Sciences, Chapter 5: Energy Transformations

An appropriate question for an observational study is one that involves collecting data through observation without manipulation. " What types of rocks are found at a convergent boundary? " requires observing and identifying the types of rocks naturally occurring at such geological formations. It doesn ' t involve changing any variables, fitting the definition of an observational study. References:

Integrated Physical Sciences, Chapter 2: Methods of Scientific Investigation