WGU Integrated Physical Sciences (MTC1) Exam Questions Instant Access

Question 1

Which of these is an example of climate change caused by human activity?

AWeather changes from regularly repeating atmospheric conditions such as El Nino

BWorldwide weather changes from changes in the flow of air currents

CYear to year differences in snowfall in a given area from different weather patterns

DWarming because of farming and fuel use adding nitrous oxide to the atmosphere

Answer : D

Human activities, such as farming and the burning of fossil fuels, release greenhouse gases, including nitrous oxide, into the atmosphere. These gases trap heat and contribute to global warming and climate change. Unlike natural variability in weather patterns, human-induced climate change is characterized by long-term changes in temperature, precipitation patterns, and other climatic factors due to increased concentrations of greenhouse gases.

Integrated Physical Sciences materials on climate change and human impact.

Scientific studies on the effects of greenhouse gases and global warming.

Question 2

Which of these is an example of climate change caused by human activity?

AA change in temperature from an approaching cold front

BA decrease in temperature from a change in wind direction

CA decrease in temperature because of increased cloud cover

DA change in average temperature from methane released by farming

Answer : D

Human activities, such as farming, release significant amounts of methane into the atmosphere. Methane is a potent greenhouse gas, which traps heat in the Earth's atmosphere, leading to an increase in the average temperature, thus contributing to climate change. Unlike natural short-term weather changes, such as those caused by cold fronts or cloud cover, the long-term changes in average temperatures from greenhouse gases are examples of human-induced climate change. Reference:

IPCC (Intergovernmental Panel on Climate Change) Reports

NOAA (National Oceanic and Atmospheric Administration) Climate Change Information

Question 3

Which layer of the atmosphere would an atmospheric scientist be investigating if the scientist were studying the formation of clouds?

AStratosphere

BMesosphere

CThermosphere

DTroposphere

Answer : D

The troposphere is the lowest layer of the atmosphere where weather phenomena, including cloud formation, occur.

Atmospheric scientists study cloud formation and other weather-related processes within this layer. Reference:

Integrated Physical Sciences resources on atmospheric layers and weather processes.

Question 4

Kepler discovered that planets move in elliptical paths around the sun. Repeated observations have confirmed Kepler's finding.

Which type of scientific statement is Kepler's discovery?

AInference

BTheory

CLaw

DHypothesis

Answer : C

Kepler's discovery that planets move in elliptical paths around the sun is an example of a scientific law. A scientific law describes a relationship in nature that has been consistently observed to be true. Kepler's laws of planetary motion describe the predictable patterns of planetary orbits, which have been repeatedly confirmed through observation. Reference:

Integrated Physical Sciences, Chapter 4: Scientific Laws and Theories

Question 5

Which type of wave travels the slowest?

AGamma waves

BRadio waves

CVisible light waves

DSound waves

Answer : D

1. **Wave Speeds**: The speed of different types of waves varies significantly. 2. **Gamma Waves**: These are electromagnetic waves that travel at the speed of light (approximately \( 3 \times 10^8 \) m/s). 3. **Radio Waves**: Another type of electromagnetic wave, also traveling at the speed of light. 4. **Visible Light Waves**: These are also electromagnetic waves traveling at the speed of light. 5. **Sound Waves**: Travel much slower compared to electromagnetic waves, with typical speeds in air around 343 m/s. 6. **Conclusion**: Among the given options, sound waves travel the slowest. **Reference**: - Wave Speed Comparisons: Differences in propagation speeds of sound and electromagnetic waves.

Question 6

On Tuesday morning, it was cool and clear. On Tuesday afternoon, light rain and fog occurred. On Wednesday morning, it was warmer and clear.

What caused the change in weather from Tuesday morning to Wednesday morning?

AA cold front moved through the area on Wednesday.

BA high pressure system moved through the area on Tuesday afternoon.

CA warm front moved through the area on Tuesday.

DA low pressure system moved out of the area on Tuesday morning.

Answer : C

The weather change from cool and clear in the morning to light rain and fog in the afternoon, followed by warmer and clear conditions the next morning, is indicative of a warm front passing through the area. A warm front occurs when a warm air mass moves over a cold air mass, causing the warm air to rise and condense, leading to precipitation. After the front passes, the area experiences warmer temperatures and clearing skies.

Integrated Physical Sciences resources on weather fronts and their effects.

Meteorological studies on the impact of warm fronts on local weather patterns.

Question 7

Numerous experiments have confirmed that if the distance between a light source and an observer is doubled, the intensity of the light as viewed by the observer decreases by a factor of four.

Which type of scientific statement is this?

ALaw

BHypothesis

CTheory

DInference

Answer : A

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. Reference:

Integrated Physical Sciences, Chapter 4: Scientific Laws and Theories