Integrated Physical Sciences (C165)
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Free Integrated Physical Sciences (C165) Questions
An atmospheric chemist conducts experiments to determine how a new type of pesticide may affect the ozone layer. Which layer of the atmosphere would the atmospheric chemist need to study?
- Exosphere
- Mesosphere
- Thermosphere
- Stratosphere
Explanation
Explanation
Correct answer: (D) Stratosphere
The ozone layer is located within the stratosphere, a region of Earth’s atmosphere where ozone molecules absorb and filter harmful ultraviolet radiation from the Sun. Any study on chemicals affecting the ozone layer must therefore focus on the stratosphere.
Which scenario demonstrates a chemical change?
- An ice cube melts into water.
- Droplets form on a cold glass cup.
- Water is boiled to water vapor.
- A cut of meat spoils when left out.
Explanation
Explanation
Correct answer: (D) A cut of meat spoils when left out.
A chemical change produces new substances with different properties, often involving irreversible processes such as decomposition. When meat spoils, chemical reactions caused by bacteria break down proteins and fats, forming new substances and changing odor, texture, and composition.
While listening to the morning weather report, a scientist hears that a low pressure system is settling over the area. How should the scientist prepare for the day’s weather?
- Dress in lightweight clothing and apply a lot of sunscreen to prepare for hot, sunny weather.
- Wear warm clothes and bring sunglasses to prepare for cold, sunny weather.
- Bring extra water and prepare for very hot, humid weather.
- Bring an umbrella and wear waterproof shoes to prepare for cloudy, rainy weather.
Explanation
Explanation
Correct answer: (D) Bring an umbrella and wear waterproof shoes to prepare for cloudy, rainy weather.
A low pressure system is associated with rising air, which cools and condenses to form clouds and precipitation. This typically leads to cloudy, unstable weather conditions with a higher likelihood of rain, so preparing for wet conditions is appropriate.
A river flows across a region. As the river flows, it erodes the rock beneath it. Which type of landform will develop if the river continues to flow along a straight path
-
Valley
-
Canyon
-
Meander
-
Ridge
Explanation
Correct Answer A: Valley
Explanation:
As a river flows along a straight path, it erodes the rock and creates a valley. Over time, the erosion deepens and widens the riverbed, forming a valley.
Why other options are wrong:
B) Canyon:
A canyon typically forms in areas with steep cliffs and is usually the result of more intense erosion over a longer period. It's less likely to form along a straight path.
C) Meander:
A meander refers to the winding curves of a river as it erodes the land. This is usually found in flatter regions rather than along a straight path.
D) Ridge:
A ridge is a raised area of land, which is not typically formed by the erosion of a river.
Why did the Apollo 11 landing craft and astronauts stay on the surface of the Moon without floating off into outer space?
- The Moon's thin atmosphere provides enough resistance to impede movement.
- The Moon exerts a gravitational pull that keeps objects on its surface.
- The surface of the Moon exerts static friction, which keeps objects in place.
- The spring force on the Moon causes any object that springs up to spring back down.
Explanation
Explanation
Correct answer: (B) The Moon exerts a gravitational pull that keeps objects on its surface.
Gravity is the universal attractive force between masses. The Moon’s gravitational field pulls objects toward its center, keeping the Apollo 11 landing craft and astronauts anchored to the lunar surface rather than drifting into space.
What is true during winter in the northern hemisphere?
- Earth's distance from the sun is greatest.
- The northern hemisphere is tilted toward the sun.
- The northern hemisphere is tilted away from the sun.
- Earth's tilt is at its smallest value.
Explanation
Explanation
Correct answer: (C) The northern hemisphere is tilted away from the sun.
Winter in the Northern Hemisphere occurs because Earth’s axial tilt causes this hemisphere to be angled away from the Sun. This results in less direct sunlight and shorter daylight hours, leading to cooler temperatures.
Which type of wave is involved when people view a rainbow?
- Visible light
- X-rays
- Microwaves
- Infrared radiation
Explanation
Explanation
Correct answer: (A) Visible light
A rainbow is formed when sunlight is refracted, reflected, and dispersed by water droplets in the atmosphere. This process separates sunlight into its component colors, which are all part of the visible light spectrum detectable by the human eye.
In 1996, NASA scientists claimed that a Martian meteor contained chemical compounds that indicated life on Mars 3.6 billion years ago. However, further studies showed that the same chemical compounds were found in rocks from the Moon, where no life ever existed. What is the appropriate scientific approach for dealing with this contradiction?
- Conclude that there must have been life on the Moon at some time in the past
- Decide that life could never have existed on Mars because the chemicals are also found on the Moon
- Determine that the chemical compounds that were found do not necessarily indicate life
- Accept the idea that there has been life on Mars because the scientists worked for NASA
Explanation
Explanation
Correct answer: (C) Determine that the chemical compounds that were found do not necessarily indicate life
Scientific reasoning requires revising interpretations when new evidence contradicts earlier conclusions. If the same chemical compounds are found in environments where life clearly did not exist, then those compounds cannot be considered definitive indicators of life. The appropriate scientific response is to reinterpret the evidence and conclude that the presence of those compounds alone is insufficient to confirm biological activity.
While listening to the morning weather report, a scientist hears that a low-pressure system is settling over the area.
How should the scientist prepare for the day's weather?
- Dress in lightweight clothing and apply a lot of sunscreen to prepare for hot, sunny weather.
- Bring an umbrella and wear waterproof shoes to prepare for cloudy, rainy weather.
- Wear warm clothes and bring sunglasses to prepare for cold, sunny weather.
- Bring extra water and prepare for very hot, humid weather.
Explanation
Explanation:
Correct answer: (B.) Bring an umbrella and wear waterproof shoes to prepare for cloudy, rainy weather.
Low-pressure systems are often associated with cloudy, rainy weather. Since the scientist heard that a low-pressure system is settling over the area, it’s most likely that there will be cloudy and rainy conditions. The best preparation would be to bring an umbrella and waterproof shoes.
Which statement represents a general characteristic of metalloids?
- They are poor conductors of electricity.
- They are used for electrical wires.
- They are both malleable and ductile.
- They have intermediate electrical conductivity.
Explanation
Explanation
Correct answer: (D) They have intermediate electrical conductivity.
Metalloids are defined as elements that exhibit properties between metals and nonmetals. A key characteristic is that they have intermediate electrical conductivity, meaning they can conduct electricity better than nonmetals but not as well as metals.
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Frequently Asked Question
SCIE 1020 C165 covers fundamental principles of physical sciences, including Newton’s Laws of Motion, energy transfer, the greenhouse effect, atomic structure, chemical reactions, forces, and properties of matter.
The best approach includes reviewing course materials, taking practice quizzes, watching explanatory videos, and applying concepts to real-world scenarios to strengthen understanding.
Newton’s First Law (the Law of Inertia) explains why objects resist changes in motion, such as why passengers lurch forward when a car suddenly stops.
Water’s high specific heat capacity allows it to absorb and release heat slowly, helping stabilize temperatures in coastal and oceanic environments.
Greenhouse gases trap infrared radiation emitted by Earth's surface, preventing heat from escaping and leading to an increase in global temperatures.
The three types of heat transfer are conduction (direct contact), convection (fluid movement), and radiation (electromagnetic waves).
Kinetic energy is the energy of motion (e.g., a moving car), while potential energy is stored energy (e.g., a stretched rubber band).