CSET Subtest II – Certification Exam with 169 Questions
and Correct Answers | Latest 2025/2026 Edition – Full
Practice and Prep Guide
WGU Science Comprehensive Practice Exam
167 Most Tested Questions with Multiple Choice and Explanations
Question 1
Which sequence correctly describes the water cycle?
A. Evaporation → Condensation → Precipitation → Collection
B. Condensation → Evaporation → Precipitation → Collection
C. Precipitation → Evaporation → Condensation → Collection
D. Collection → Precipitation → Evaporation → Condensation
Answer: A. Evaporation → Condensation → Precipitation → Collection
Rationale: The water cycle begins with evaporation (liquid to gas), followed by
condensation (gas to liquid forming clouds), then precipitation (water falling as
rain/snow), and finally collection (water gathering in oceans, lakes, etc.).
Question 2
A raindrop falling through the atmosphere is affected by gravity. In the Northern
Hemisphere, which direction will it appear to fall due to Earth's rotation?
A. Straight down
B. Slight left direction
C. Slight right direction
D. Upward direction
Answer: C. Slight right direction
,Rationale: Due to the Coriolis effect, moving objects in the Northern Hemisphere
are deflected to the right. This includes falling raindrops, though the effect is
minimal over short distances.
Question 3
What gives grass and other plants their green color?
A. Chloroplasts absorbing green light
B. Chlorophyll reflecting green light
C. Cell walls containing green pigments
D. Sunlight turning leaves green
Answer: B. Chlorophyll reflecting green light
Rationale: Chlorophyll absorbs blue light and red light most efficiently for
photosynthesis, but it reflects green light, which is why plants appear green to our
eyes.
Question 4
Why is it colder in California's Central Valley during winter compared to the
coast?
A. The valley is at a higher elevation than the coast
B. The ocean moderates temperatures, keeping the coast warmer
C. The valley receives less direct sunlight than the coast
D. Cold air sinks and settles in the valley
Answer: B. The ocean moderates temperatures, keeping the coast warmer
Rationale: Water has a high specific heat capacity, meaning it heats and cools
slowly. The ocean releases stored heat during winter, keeping coastal areas
milder, while inland areas like the Central Valley experience greater temperature
extremes.
Question 5
Why doesn't ocean water freeze as easily as freshwater in a lake?
,A. Ocean water contains salt, which lowers its freezing point
B. Ocean water is constantly moving, preventing ice formation
C. The ocean is too deep to freeze completely
D. Marine life generates heat that warms the water
Answer: A. Ocean water contains salt, which lowers its freezing point
*Rationale: Salt dissolves in water and interferes with the formation of ice
crystals. Seawater typically freezes at about -2°C (28°F), while freshwater freezes
at 0°C (32°F).*
Question 6
What would happen if a plant was watered with salt water (ocean water)?
A. The plant would grow faster due to added minerals
B. The plant would wilt and potentially die from water loss
C. The plant would thrive because salt acts as a fertilizer
D. The plant would convert the salt into fresh water
Answer: B. The plant would wilt and potentially die from water loss
Rationale: Osmosis causes water to move from areas of low solute concentration
to high solute concentration. Salt water outside the plant cells has higher solute
concentration than inside the cells, causing water to leave the cells, leading to
wilting and death.
Question 7
During the June solstice in the Northern Hemisphere, which location experiences
the longest period of daylight?
A. Miami, Florida
B. New York City
C. Anchorage, Alaska
D. Mexico City
Answer: C. Anchorage, Alaska
, Rationale: During the June solstice, the Northern Hemisphere is tilted toward the
sun. Locations closer to the Arctic Circle experience longer daylight hours, with
Anchorage, Alaska receiving nearly 19 hours of daylight.
Question 8
Which instrument is used to measure atmospheric pressure?
A. Thermometer
B. Hygrometer
C. Barometer
D. Anemometer
Answer: C. Barometer
Rationale: A barometer measures atmospheric pressure, which is important for
weather forecasting. Thermometers measure temperature, hygrometers measure
humidity, and anemometers measure wind speed.
Question 9
What are genetic mutations and what is their role in evolution?
A. Harmful changes that always lead to disease
B. Random changes in DNA that create genetic variation within populations
C. Intentional adaptations organisms make to survive
D. Changes that only occur during reproduction
Answer: B. Random changes in DNA that create genetic variation within
populations
Rationale: Mutations are changes in DNA sequences. They create genetic variation
within populations, which is essential for natural selection. Some mutations may
be beneficial (like camouflage), some harmful, and some neutral. They provide the
raw material for evolution.
Question 10
What is true about Polaris (the North Star)?
and Correct Answers | Latest 2025/2026 Edition – Full
Practice and Prep Guide
WGU Science Comprehensive Practice Exam
167 Most Tested Questions with Multiple Choice and Explanations
Question 1
Which sequence correctly describes the water cycle?
A. Evaporation → Condensation → Precipitation → Collection
B. Condensation → Evaporation → Precipitation → Collection
C. Precipitation → Evaporation → Condensation → Collection
D. Collection → Precipitation → Evaporation → Condensation
Answer: A. Evaporation → Condensation → Precipitation → Collection
Rationale: The water cycle begins with evaporation (liquid to gas), followed by
condensation (gas to liquid forming clouds), then precipitation (water falling as
rain/snow), and finally collection (water gathering in oceans, lakes, etc.).
Question 2
A raindrop falling through the atmosphere is affected by gravity. In the Northern
Hemisphere, which direction will it appear to fall due to Earth's rotation?
A. Straight down
B. Slight left direction
C. Slight right direction
D. Upward direction
Answer: C. Slight right direction
,Rationale: Due to the Coriolis effect, moving objects in the Northern Hemisphere
are deflected to the right. This includes falling raindrops, though the effect is
minimal over short distances.
Question 3
What gives grass and other plants their green color?
A. Chloroplasts absorbing green light
B. Chlorophyll reflecting green light
C. Cell walls containing green pigments
D. Sunlight turning leaves green
Answer: B. Chlorophyll reflecting green light
Rationale: Chlorophyll absorbs blue light and red light most efficiently for
photosynthesis, but it reflects green light, which is why plants appear green to our
eyes.
Question 4
Why is it colder in California's Central Valley during winter compared to the
coast?
A. The valley is at a higher elevation than the coast
B. The ocean moderates temperatures, keeping the coast warmer
C. The valley receives less direct sunlight than the coast
D. Cold air sinks and settles in the valley
Answer: B. The ocean moderates temperatures, keeping the coast warmer
Rationale: Water has a high specific heat capacity, meaning it heats and cools
slowly. The ocean releases stored heat during winter, keeping coastal areas
milder, while inland areas like the Central Valley experience greater temperature
extremes.
Question 5
Why doesn't ocean water freeze as easily as freshwater in a lake?
,A. Ocean water contains salt, which lowers its freezing point
B. Ocean water is constantly moving, preventing ice formation
C. The ocean is too deep to freeze completely
D. Marine life generates heat that warms the water
Answer: A. Ocean water contains salt, which lowers its freezing point
*Rationale: Salt dissolves in water and interferes with the formation of ice
crystals. Seawater typically freezes at about -2°C (28°F), while freshwater freezes
at 0°C (32°F).*
Question 6
What would happen if a plant was watered with salt water (ocean water)?
A. The plant would grow faster due to added minerals
B. The plant would wilt and potentially die from water loss
C. The plant would thrive because salt acts as a fertilizer
D. The plant would convert the salt into fresh water
Answer: B. The plant would wilt and potentially die from water loss
Rationale: Osmosis causes water to move from areas of low solute concentration
to high solute concentration. Salt water outside the plant cells has higher solute
concentration than inside the cells, causing water to leave the cells, leading to
wilting and death.
Question 7
During the June solstice in the Northern Hemisphere, which location experiences
the longest period of daylight?
A. Miami, Florida
B. New York City
C. Anchorage, Alaska
D. Mexico City
Answer: C. Anchorage, Alaska
, Rationale: During the June solstice, the Northern Hemisphere is tilted toward the
sun. Locations closer to the Arctic Circle experience longer daylight hours, with
Anchorage, Alaska receiving nearly 19 hours of daylight.
Question 8
Which instrument is used to measure atmospheric pressure?
A. Thermometer
B. Hygrometer
C. Barometer
D. Anemometer
Answer: C. Barometer
Rationale: A barometer measures atmospheric pressure, which is important for
weather forecasting. Thermometers measure temperature, hygrometers measure
humidity, and anemometers measure wind speed.
Question 9
What are genetic mutations and what is their role in evolution?
A. Harmful changes that always lead to disease
B. Random changes in DNA that create genetic variation within populations
C. Intentional adaptations organisms make to survive
D. Changes that only occur during reproduction
Answer: B. Random changes in DNA that create genetic variation within
populations
Rationale: Mutations are changes in DNA sequences. They create genetic variation
within populations, which is essential for natural selection. Some mutations may
be beneficial (like camouflage), some harmful, and some neutral. They provide the
raw material for evolution.
Question 10
What is true about Polaris (the North Star)?
