GED® Practice Exam 1 Science

Which of the following creates electromagnetic waves?

An electron that is stationary
An electron that is approaching a proton
An electron that is moving at a constant velocity
An electron that is moving at a decreasing velocity

What is the purpose of a placebo?

Determine how people respond to treatment
Represent the independent variable in a study
Account for a psychological factor during treatment
Provide an additional way to collect data for analysis

Why did it take many years for the cell theory to be developed?

Advancements in microscopy took place slowly.
Cells were difficult to isolate for experimental analysis.
Researchers believed a cell formed from preexisting cells.
Scientists already proved that cells were essential for life.

Which of the following steps of the scientific method relies on logic reasoning to be formulated?

Asking a question
Writing a conclusion
Researching information
Developing a hypothesis

Which of the following sequences describes the hierarchy level of biological organization?

Kingdom, phylum, class, order, family, genus, and species
Genus, class, kingdom, species, order, phylum, and family
Family, species, genus, order, kingdom, class, and phylum
Species, kingdom, genus, class, family, phylum, and order

When a researcher determines the cause-and-effect relationship between two variables, which of the following parts of the scientific method is the researcher performing?

Analysis
Conclusion
Experiment
Hypothesis

Which class of biomolecules help transmit genetic information?

Lipids
Proteins
Nucleic acids
Carbohydrates

Which of the following is an example of a physical property?

Amount
Corrosion
Reactivity
Rusting

When using the scientific method, which of the following does a researcher do immediately after proposing a scientific question?

Perform background research on the topic
Analyze data to observe trends or patterns
Collect information or data during an experiment
Communicate results in an article or presentation

Which of the following cell components is characterized as a jelly-like substance?

Nucleus
Vacuole
Cytoplasm
Cell membrane

Which statement is most strongly supported by the cell theory?

Plant cells have similar cell parts to animal cells.
Cells house their genetic information in the nucleus.
Blood cells arise from stem cells in the bone marrow.
Nonliving things lack a cell and associated organelles.

Children on a turning bus feel a centrifugal force to the west. What is the direction of the centripetal force?

East
North
South
West

The amount of matter that an object contains is _____.

deposition
mass
polarity
sublimation

Which of the following is part of the metric system?

Celsius
Feet
Ounces
Pound

Which of the following characteristics is unique to all prokaryotes?

Creates gametes
Requires meiosis
Uses photosynthesis
Reproduces asexually

Which of the following parts of an atom has no charge?

Electron
Neutron
Nucleus
Proton

Which of the following atoms is an anion?

12 protons, 12 neutrons, 10 electrons
16 protons, 16 neutrons, 18 electrons
19 protons, 20 neutrons, 19 electrons
26 protons, 30 neutrons, 24 electrons

Which of the following is classified as a type of acid-base reaction that produces a salt?

Combination
Decomposition
Hydrolysis
Neutralization

An offspring receives which of the following number of allele(s) for a particular trait from each parent.

1
2
3
4

A man applies a force to a wall by pushing on it. What does the wall do in response?

The wall applies a greater force in the same direction.
The wall applies a smaller force in the opposite direction.
The wall applies a force of equal magnitude in the same direction.
The wall applies a force of equal magnitude in the opposite direction.

A softball player throws a ball at a moderately upward angle to the ground. Which term best describes the motion of the ball?

Linear
Nonlinear
Stationary
Rotational

A neutral atom has two electrons in its first energy shell, eight electrons in its second energy shell, and three electrons in its third energy shell.

Which electrons will be lost when the atom reacts to become stable?

Electrons in the first shell
Electrons in the second shell
Electrons in the third shell
Electrons in the second or third shell

In DNA replication, a DNA strand is separated, which of the following also occurs?

complementary strand attaches.
complementary strand is assembled.
complementary strand replicates itself.
complementary strand forms a double helix.

A scientist wants to determine how much current a particular instrument is drawing. If she knows how much voltage the instrument employs and how much resistance it presents, which principle must she use?

Ohm’s law
Electric flux
Coulomb’s law
Electromagnetic induction

During which of the following phase changes will the cohesion between the particles in a substance decrease?

Condensation
Deposition
Freezing
Vaporization

Water can act as an acid or a base. Because of this behavior, which of the following describes what it is known to be?

amphoteric.
aqueous.
ionic.
pure.

Region X and region Y are approximately the same size, but the magnetic flux through region X is much higher. Which statement about these regions is correct?

The magnetic force in region X is less than in region Y.
The magnetic force in region X is greater than in region Y.
The magnetic force in region X and in region Y is about zero.
The magnetic force in region X is about the same as in region Y.

Mitosis is different from meiosis because mitosis does which of the following?

is a form of asexual reproduction.
leads to the production of gametes.
includes two rounds of cell division.
results in increased genetic diversity.

Which of the following isotopes of boron should be the most abundant, and why?

Boron-10, because its mass is closer to the average atomic mass in the periodic table.
Boron-11, because its mass is closer to the average atomic mass in the periodic table.
Boron-10, because its mass is farther from the average atomic mass in the periodic table.
D Boron-11, because its mass is farther from the average atomic mass in the periodic table.

How is an airbag useful in car accidents?

The airbag increases the force exerted by the driver.
The airbag decreases the force exerted by the driver.
The airbag increases the velocity exerted by the driver.
The airbag decreases the velocity exerted by the driver.

Which parameter is always a vector?

Acceleration
Mass
Speed
Velocity

How many potassium and nitrogen ions are needed to form an ionic compound?

One potassium ion and one nitrogen ion
Three potassium ions and one nitrogen ion
One potassium ion and three nitrogen ions
Three potassium ions and three nitrogen ions

Which of the following atoms will have an overall negative charge?

9 protons, 10 neutrons, 9 electrons
12 protons, 13 neutrons, 10 electrons
14 protons, 14 neutrons, 10 electrons
15 protons, 16 neutrons, 18 electrons

One isotope of a particular element is neutral, and a different isotope of that element is an ion. Which conclusion is correct?

One isotope has more protons than the other.
One isotope has more electrons than the other.
Both isotopes have the same number of neutrons.
Both isotopes have the same number of nucleons.

A scientist wants to measure how far a person can run in 30 minutes. Which of the following units should she use to record this measurement as a small number?

Gigameters
Kilometers
Megameters
Terameters

Which of the following explains why oxygen diffuses out of lungs into the bloodstream?

The oxygen is repulsed by the blood.
The oxygen is being pulled into the blood.
The oxygen is polar, and the blood has the opposite charge.
The oxygen is going from a higher area of concentration to a lower one.

How many cups are in 22 pints?

11
20
24
44

Human cells have _____ sets of different chromosomes.

12
23
46
50

If a biochemist isolates a large amount of pyruvate, which of the following parts of the cell is he working with?

Chloroplasts
Cytoplasm
Mitochondria
Nucleus

Which of the following is a characteristic of citrus substances?

Taste sour
Have a pH of 7
Turn litmus blue
Slippery to touch

Which of the following can be a result of friction on a moving object?

Centripetal acceleration
An increase in the object’s speed
Movement of a fluid surrounding the object
A net force in the direction of the object’s velocity

Which of the following is an example of electromagnetic induction?

A wire loop spinning in a magnetic field
A proton exerting a force on an electron
A battery delivering electric current to a resistor
An accelerating charge creating electromagnetic waves

An observer reports seeing a large, far-off explosion before feeling rumbles in the ground. Which explanation best accounts for this difference?

The electromagnetic waves have a greater frequency than the mechanical waves.
The electromagnetic waves have a greater amplitude than the mechanical waves.
The electromagnetic waves have a greater wavelength than the mechanical waves.
The electromagnetic waves have a greater wave speed than the mechanical waves.

Which of the following happens to the shape and volume of a sample of helium gas when it is transferred from a tank to a balloon?

Both the shape and volume change.
Neither the shape nor the volume changes.
The shape changes, but the volume remains the same.
The volume changes, but the shape remains the same.

Which of the following phase changes will a substance have less energy at the end than it did at the beginning?

Deposition
Melting
Sublimation
Vaporization

A stationary object can possess which of the following?

Impulse
Momentum
Kinetic energy
Potential energy

Which statement best describes the motion of smooth ball thrown into the air on a calm day?

The ball follows a line.
The ball follows a circular path.
The ball follows an erratic path.
The ball follows a parabolic path.

The graph below shows the energy of the species involved in a chemical reaction as the reaction proceeds. How much energy is released in this reaction?

10 kJ
20 kJ
30 kJ
40 kJ

Which of the following is an example of a homogeneous mixture?

A bowl of cereal with milk
A glass of lemonade with ice
A mixture of silver and gold coins
A pitcher of cherry-flavored beverage

Which of the following equations shows a single-replacement reaction?

3H₂ + N₂ → 2NH₃
Zn + 2HCl → H₂ + ZnCl₂
C₂H₄ + 3O₂ → 2CO₂ + 2H₂O
2AgNO₃ + CuCl₂ → 2AgCl + Cu(NO₃)₂

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