WGU C165 Integrated Physical Science Exam Review
and Study Guide for Western Governors University
Students | Basic Physics Concepts, Chemistry
Principles, Earth Science, Energy Forms, Motion and
Forces, Matter Properties, Scientific Investigation
Skills and Physical Science Foundations Practice
Questions and Answers | Updated 2026 Assessment
Preparation Resource
Question 1:
What is the primary cause of seasonal changes on Earth?
• A) The distance of Earth from the Sun
• B) The tilt of the Earth's axis
• C) The elliptical shape of Earth's orbit
• D) The variation in solar output
Correct Option: B) The tilt of the Earth's axis
Rationale:
The tilt of the Earth's axis (approximately 23.5 degrees) is responsible for the variation in
sunlight received at different latitudes throughout the year, leading to the changing
seasons. As Earth orbits the Sun, this axial tilt causes different parts of the planet to
receive varying amounts of solar energy, resulting in seasonal weather patterns. This
effect is more pronounced at higher latitudes, whereas regions near the equator
experience less seasonal variation.
Question 2:
During a chemical reaction, which of the following best describes the law of
conservation of mass?
• A) Energy can neither be created nor destroyed
• B) The mass of the reactants equals the mass of the products
• C) Atoms are created and destroyed in a reaction
• D) Mass can be converted into energy
Correct Option: B) The mass of the reactants equals the mass of the products
Rationale:
The law of conservation of mass states that in a closed system, the total mass remains
,constant throughout a chemical reaction; thus, the mass of the reactants must equal
the mass of the products. This principle underpins all chemical reactions and
demonstrates that matter is neither created nor destroyed, but rather rearranged.
Hence, for any reaction, the reactants and products must balance in terms of mass.
Question 3:
Which of the following statements is true about the electromagnetic spectrum?
• A) Gamma rays have the longest wavelength
• B) Infrared radiation can only be perceived by humans through heat
• C) Ultraviolet light has a higher frequency than visible light
• D) Radio waves are not used for communication
Correct Option: C) Ultraviolet light has a higher frequency than visible light
Rationale:
The electromagnetic spectrum consists of a range of electromagnetic waves
categorized by wavelength and frequency. Ultraviolet (UV) light has a higher frequency
than visible light, which allows it to carry more energy. This distinction is critical in
understanding various phenomena, such as the effects of UV radiation on skin cells and
how different wavelengths are absorbed by different materials. The arrangement of the
spectrum shows that gamma rays have the shortest wavelength and highest frequency,
while radio waves possess the longest wavelength and lowest frequency.
Question 4:
In Newton's second law of motion, what does the equation 𝐹 = 𝑚𝑎represent?
• A) An object in motion stays in motion
• B) The force acting on an object is equal to the mass of the object multiplied
by its acceleration
• C) Energy is conserved in a closed system
• D) An object at rest will remain at rest unless acted upon
Correct Option: B) The force acting on an object is equal to the mass of the object
multiplied by its acceleration
Rationale:
Newton's second law of motion defines the relationship between an object's mass, its
acceleration, and the net force acting on it. According to this law, the net force 𝐹is
directly proportional to the mass 𝑚of the object and its acceleration 𝑎. This principle is
foundational in mechanics and highlights how an increase in the mass of an object
, results in a decrease in acceleration for a given force, illustrating the inverse
relationship between mass and acceleration under constant force.
Question 1:
What is the primary cause of seasonal changes on Earth?
• A) The distance of Earth from the Sun
• B) The tilt of the Earth's axis
• C) The elliptical shape of Earth's orbit
• D) The variation in solar output
Correct Option: B) The tilt of the Earth's axis
Rationale: The tilt of the Earth's axis (approximately 23.5 degrees) leads to varying
sunlight exposure across different seasons, affecting climate and weather patterns.
Question 2:
During a chemical reaction, which of the following best describes the law of
conservation of mass?
• A) Energy can neither be created nor destroyed
• B) The mass of the reactants equals the mass of the products
• C) Atoms are created and destroyed in a reaction
• D) Mass can be converted into energy
Correct Option: B) The mass of the reactants equals the mass of the products
Rationale: This law asserts that matter is conserved; no mass is lost or gained in
chemical reactions, reinforcing the balance between reactants and products.
Question 3:
Which of the following statements is true about the electromagnetic spectrum?
• A) Gamma rays have the longest wavelength
• B) Infrared radiation can only be perceived by humans through heat
• C) Ultraviolet light has a higher frequency than visible light
• D) Radio waves are not used for communication
Correct Option: C) Ultraviolet light has a higher frequency than visible light
Rationale: The electromagnetic spectrum organizes waves by frequency; UV light
carries more energy than visible light, affecting biological processes.
and Study Guide for Western Governors University
Students | Basic Physics Concepts, Chemistry
Principles, Earth Science, Energy Forms, Motion and
Forces, Matter Properties, Scientific Investigation
Skills and Physical Science Foundations Practice
Questions and Answers | Updated 2026 Assessment
Preparation Resource
Question 1:
What is the primary cause of seasonal changes on Earth?
• A) The distance of Earth from the Sun
• B) The tilt of the Earth's axis
• C) The elliptical shape of Earth's orbit
• D) The variation in solar output
Correct Option: B) The tilt of the Earth's axis
Rationale:
The tilt of the Earth's axis (approximately 23.5 degrees) is responsible for the variation in
sunlight received at different latitudes throughout the year, leading to the changing
seasons. As Earth orbits the Sun, this axial tilt causes different parts of the planet to
receive varying amounts of solar energy, resulting in seasonal weather patterns. This
effect is more pronounced at higher latitudes, whereas regions near the equator
experience less seasonal variation.
Question 2:
During a chemical reaction, which of the following best describes the law of
conservation of mass?
• A) Energy can neither be created nor destroyed
• B) The mass of the reactants equals the mass of the products
• C) Atoms are created and destroyed in a reaction
• D) Mass can be converted into energy
Correct Option: B) The mass of the reactants equals the mass of the products
Rationale:
The law of conservation of mass states that in a closed system, the total mass remains
,constant throughout a chemical reaction; thus, the mass of the reactants must equal
the mass of the products. This principle underpins all chemical reactions and
demonstrates that matter is neither created nor destroyed, but rather rearranged.
Hence, for any reaction, the reactants and products must balance in terms of mass.
Question 3:
Which of the following statements is true about the electromagnetic spectrum?
• A) Gamma rays have the longest wavelength
• B) Infrared radiation can only be perceived by humans through heat
• C) Ultraviolet light has a higher frequency than visible light
• D) Radio waves are not used for communication
Correct Option: C) Ultraviolet light has a higher frequency than visible light
Rationale:
The electromagnetic spectrum consists of a range of electromagnetic waves
categorized by wavelength and frequency. Ultraviolet (UV) light has a higher frequency
than visible light, which allows it to carry more energy. This distinction is critical in
understanding various phenomena, such as the effects of UV radiation on skin cells and
how different wavelengths are absorbed by different materials. The arrangement of the
spectrum shows that gamma rays have the shortest wavelength and highest frequency,
while radio waves possess the longest wavelength and lowest frequency.
Question 4:
In Newton's second law of motion, what does the equation 𝐹 = 𝑚𝑎represent?
• A) An object in motion stays in motion
• B) The force acting on an object is equal to the mass of the object multiplied
by its acceleration
• C) Energy is conserved in a closed system
• D) An object at rest will remain at rest unless acted upon
Correct Option: B) The force acting on an object is equal to the mass of the object
multiplied by its acceleration
Rationale:
Newton's second law of motion defines the relationship between an object's mass, its
acceleration, and the net force acting on it. According to this law, the net force 𝐹is
directly proportional to the mass 𝑚of the object and its acceleration 𝑎. This principle is
foundational in mechanics and highlights how an increase in the mass of an object
, results in a decrease in acceleration for a given force, illustrating the inverse
relationship between mass and acceleration under constant force.
Question 1:
What is the primary cause of seasonal changes on Earth?
• A) The distance of Earth from the Sun
• B) The tilt of the Earth's axis
• C) The elliptical shape of Earth's orbit
• D) The variation in solar output
Correct Option: B) The tilt of the Earth's axis
Rationale: The tilt of the Earth's axis (approximately 23.5 degrees) leads to varying
sunlight exposure across different seasons, affecting climate and weather patterns.
Question 2:
During a chemical reaction, which of the following best describes the law of
conservation of mass?
• A) Energy can neither be created nor destroyed
• B) The mass of the reactants equals the mass of the products
• C) Atoms are created and destroyed in a reaction
• D) Mass can be converted into energy
Correct Option: B) The mass of the reactants equals the mass of the products
Rationale: This law asserts that matter is conserved; no mass is lost or gained in
chemical reactions, reinforcing the balance between reactants and products.
Question 3:
Which of the following statements is true about the electromagnetic spectrum?
• A) Gamma rays have the longest wavelength
• B) Infrared radiation can only be perceived by humans through heat
• C) Ultraviolet light has a higher frequency than visible light
• D) Radio waves are not used for communication
Correct Option: C) Ultraviolet light has a higher frequency than visible light
Rationale: The electromagnetic spectrum organizes waves by frequency; UV light
carries more energy than visible light, affecting biological processes.
