Try our second free GED Science Practice Test to keep building your skills and confidence! This test features new questions that cover life science, physical science, and Earth and space science. You’ll analyze data, interpret charts and graphs, and apply scientific reasoning to answer each question.
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Question 1 of 20
Mia believed that meditating for 14 days in a row could make students happier. To test her hypothesis, she conducted an experiment with 40 fellow students in her class. She provided each of these students an app that guides users through a 5- or 10-minute meditation.
After Mia presented the results to her class, her teacher told her that she made an error in designing her experiment. What error is the teacher most likely referring to?
Question 2 of 20
Sustainable agriculture is the act of farming using principles of ecology, or the study of relationships between organisms and their environment. Unsustainable agriculture involves practices that can cause long-term damage to soil over time. This includes too much tillage leading to erosion and irrigation without adequate drainage leading to soil salinization. Long-term experiments have provided some of the best data on how various practices affect soil properties essential to sustainability. In the United States, the USDA Natural Resources Conservation Service specializes in providing technical and financial assistance for those interested in pursuing natural resource conservation and production agriculture as compatible goals. The most important factors for an individual farm are sun, air, soil, nutrients and water. Of the four, water and soil quality and quantity are most amenable to human intervention through time and labor.
Which sentence from the paragraph supports the idea that specific farming techniques used by humans are responsible for the environmental damage caused by unsustainable agriculture?
Question 3 of 20
As part of a study on how skin type and redness correlate when exposed to different amounts of UV light, a scientist set up an experiment to see how much redness occurred on various skin types. The scientist classified 100 people into six different categories of skin type, exposed them to increasingly higher doses of UV light, and recorded the level of redness that appeared on the skin.
Which is an independent variable and which is a dependent variable in this experiment?
Question 4 of 20
Use the table below to answer questions 4 and 5.
U.S. Energy Mix and CO₂ Emissions (1990–2025)
Year Renewables (%) Fossil Fuels (%) CO₂ Emissions (MMT)
1990
6
94
5,000
1995
7
93
5,300
2000
7
93
5,700
2005
8
92
5,800
2010
8
92
5,600
2015
9
91
5,200
2020
12
88
5,100
2025
14
86
5,200
According to the data, which five-year period saw the largest decrease in CO₂ emissions?
Question 5 of 20
U.S. Energy Mix and CO₂ Emissions (1990–2025)
Year Renewables (%) Fossil Fuels (%) CO₂ Emissions (MMT)
1990
6
94
5,000
1995
7
93
5,300
2000
7
93
5,700
2005
8
92
5,800
2010
8
92
5,600
2015
9
91
5,200
2020
12
88
5,100
2025
14
86
5,200
Between 2000 and 2005, U.S. renewable energy use increased slightly. However, CO₂ emissions also rose during that time. Which of the following best explains how both trends could occur at the same time?
Question 6 of 20
A cladogram is a diagram that organizes species into groups based on their similarities. It also shows evolutionary relationships among the groups.
Based on the information in this cladogram, which of the following statements is true?
Question 7 of 20
Cold brew coffee is one of the fastest growing trends in coffee houses across the USA. It is typically made by mixing fresh ground coffee with cold water and letting it brew for 12 to 24 hours. One coffee house came up with the idea of injecting nitrous gas into the cold brew coffee, thinking that it might improve the taste. As they tried out this new idea, they found out that the pressure of the nitrous gas had a dramatic effect on the flavor of the coffee. At that point, they decided to run an experiment with 3 batches of coffee in an effort to find the amount of pressure that produces the best flavor. The following chart shows the procedure that they followed.
Batch #1 Batch #2 Batch #3
Amount of coffee 12 ounces
12 ounces
12 ounces
Amount of water 3 cups
3 cups
3 cups
Amount of time 12 hours
18 hours
24 hours
Pressure of gas 35 PSI
45 PSI
55 PSI
What was the error in the design of their experiment?
Question 8 of 20
Two objects on Earth are dropped from the top of a building that is 70 meters high. Object A has a mass of 12 g and object B has a mass of 6 kg. Assuming there is no air resistance, which object will hit the ground first?
Question 9 of 20
A lake contains many fish that local bears depend on as their major source of food. What would be the consequence of an algal bloom killing off a large portion of the fish population?
Question 10 of 20
Researchers have created a formula for predicting the impact of population growth on the environment:E = (P x N) ÷ T E is environmental impact, P is population, N is energy demand, and T is development of new technology.
Based on this equation, in order to sustain population growth but maintain the same level of environmental impact, what factor must change at a rate equal to the rate of population growth?
Question 11 of 20
Two mice mate and produce offspring. Both of the mice have the genotype (Gg), which is the phenotype for grey fur color. Use a Punnett square to calculate the probability that these two mice will produce an offspring with white fur (gg).
Question 12 of 20
Homeostasis is the tendency to resist change in order to maintain a stable, relatively constant internal environment. Homeostasis typically involves negative feedback loops that counteract changes of various properties from their target values, known as set points.
Which of the following describes the feedback method used by a healthy human to regulate body temperature first in warm surroundings and then in cold surroundings?
Question 13 of 20
In physics, momentum = mass [in kg] ÷ velocity [in m/s]. If an object weighing 2,300 grams achieves a momentum of 2, what is its velocity?
Question 14 of 20
Use the table to answer questions 14 and 15.
Planets’ Average Temperatures and their Distances from the Sun
Planet Average Temperature (Fahrenheit) Distance from Sun (millions of miles)
Mercury
333
35.34
Venus
876
67.55
Earth
59
93.9
Mars
-81
155.5
Jupiter
-234
476.4
Which of the following statements does the information in the chart support?
Question 15 of 20
Planets’ Average Temperatures and their Distances from the Sun
Planet Average Temperature (Fahrenheit) Distance from Sun (millions of miles)
Mercury
333
35.34
Venus
876
67.55
Earth
59
93.9
Mars
-81
155.5
Jupiter
-234
476.4
Which of the following statements explains why Mercury is cooler than Venus?
Question 16 of 20
Question 16 refers to the following photograph of Halley’s Comet taken in 1910.
Which of the following processes explains the impressive tail on Halley’s Comet?
Question 17 of 20
Bob weighs an old, dry log and finds out it weighs exactly 1 kilogram. He burns the log until all that remains is gray ash. He then weighs the ash. The ash weighs 920 grams.
The 80 grams of lost mass was due to the log giving up which element during combustion?
Question 18 of 20
Use the passage and table below to answer questions 18–20.
A seventh-grade class is performing a science experiment to determine which fertilizer causes tomato plants to grow the tallest. On day 1, they plant five tomato plants into different pots. Each plant receives the same amount of water and light throughout the experiment.
Plant 1 Plant 2 Plant 3 Plant 4 Plant 5
Fertilizer Received
N/A
BestGrow
BigPlant
GiantTomato
JuicyTomato
Day 5 Height (cm)
10
11
12
11
11
Day 10 Height (cm)
12
13
15
13
12
Day 15 Height (cm)
14
16
16
18
13
Day 20 Height (cm)
15
16
17
20
14
In the experiment, which plant is the control?
Question 19 of 20
A seventh-grade class is performing a science experiment to determine which fertilizer causes tomato plants to grow the tallest. On day 1, they plant five tomato plants into different pots. Each plant receives the same amount of water and light throughout the experiment.
Plant 1 Plant 2 Plant 3 Plant 4 Plant 5
Fertilizer Received
N/A
BestGrow
BigPlant
GiantTomato
JuicyTomato
Day 5 Height (cm)
10
11
12
11
11
Day 10 Height (cm)
12
13
15
13
12
Day 15 Height (cm)
14
16
16
18
13
Day 20 Height (cm)
15
16
17
20
14
Which of the following statements is supported by the experiment’s result?
Question 20 of 20
A seventh-grade class is performing a science experiment to determine which fertilizer causes tomato plants to grow the tallest. On day 1, they plant five tomato plants into different pots. Each plant receives the same amount of water and light throughout the experiment.
Plant 1 Plant 2 Plant 3 Plant 4 Plant 5
Fertilizer Received
N/A
BestGrow
BigPlant
GiantTomato
JuicyTomato
Day 5 Height (cm)
10
11
12
11
11
Day 10 Height (cm)
12
13
15
13
12
Day 15 Height (cm)
14
16
16
18
13
Day 20 Height (cm)
15
16
17
20
14
What is the mean plant height on day 15 of the experiment?
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2
3
4
5
6
7
8
9
10
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12
13
14
15
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