PRAXIS 5005 Science ETS Practice
Test Questions and Answers
The process by which a gas becomes a liquid is called
A.condensation
B.freezing
C.melting
D.reduction - ANS-A.condensation
Condensation is the process by which a gas becomes a liquid.
Which of the following human organs is responsible for the formation of sperm cells?
A.Pancreas
B.Thyroid
C.Ovary
D.Testis - ANS-D.Testis
In human males, the testis is the organ in which the formation of sperm cells occurs.
Which of the following best describes the approximate length of time it takes Earth to
rotate once about its axis?
A.One hour
B.One day
C.One month
D.One year - ANS-B.One day
On average, it takes 24 hours, or one day, for Earth to rotate once about its axis. The
rotation of Earth about its axis leads to the cycle of day and night.
Which THREE of the following are generally acceptable rules for laboratory activities?
A.Students should wash their hands after mixing chemicals in the laboratory.
B.Students should inform the teacher immediately of any accidents or spills in the
laboratory.
C.Students should use cracked glassware only when the teacher is in the laboratory.
D.Students should read instructions thoroughly before performing laboratory
procedures. - ANS-A.Students should wash their hands after mixing chemicals in the
laboratory.
,B.Students should inform the teacher immediately of any accidents or spills in the
laboratory.
D.Students should read instructions thoroughly before performing laboratory procedures
To prevent accidental ingestion or absorption of potentially harmful substances,
students should wash their hands after working with chemicals. To help maintain a safe
environment, accidents and spills in the laboratory should be reported to the teacher
immediately so that a correct response can be implemented. To safely and effectively
complete laboratory procedures, students should read instructions thoroughly before
starting the procedures. Cracked glassware is a safety hazard and should never be
used.
Which of the following processes most directly involves the movement of water from the
atmosphere to Earth's surface?
A.Infiltration
B.Precipitation
C.Transpiration
D.Sublimation - ANS-B.Precipitation
Precipitation is the process by which atmospheric water falls to Earth's surface in the
form of rain, hail, sleet, or snow. Because atmospheric water returns to Earth's surface
primarily through the process of precipitation, it is an important part of the water cycle.
Infiltration is the process by which water on Earth's surface enters the subsurface soil
and rock. Transpiration is the process by which water evaporates from plant leaves and
enters the atmosphere. Sublimation is the process by which a substance transitions
directly from the solid phase to the gas phase without going through the liquid phase.
The characteristics presented are typical of frogs. Frogs belong to the class Amphibia,
which also includes toads and salamanders.
In an activity, students filled two identical containers with equal volumes of either
freshwater or salt water. The students then placed different objects, one at a time, in the
containers and observed whether the objects sank or floated. Which of the following
statements best accounts for an observation that the same object sank in the freshwater
but floated in the salt water?
A.The freshwater was colder than the salt water.
B.The freshwater weighed more than the salt water.
C.The salt water was denser than the freshwater.
D.The salt water was more transparent than the freshwater. - ANS-C.The salt water was
denser than the freshwater.
An object will sink in a liquid if its density is greater than that of the liquid, and it will float
if its density is less than or equal to that of the liquid. The observation that the same
, object sank in the freshwater but floated in the salt water is best accounted for by
concluding that the salt water is denser than both the object and the freshwater.
Which of the following elements are most abundant in the Sun?
A.Hydrogen and helium
B.Oxygen and carbon
C.Nitrogen and phosphorus
D.Uranium and plutonium - ANS-A.Hydrogen and helium
The composition of the Sun is approximately 99.9% hydrogen and helium.
In plants, the chlorophyll used in photosynthesis is contained in which of the following
cell structures?
A.The cell wall
B.The nucleus
C.The mitochondria
D.The chloroplasts - ANS-D.The chloroplasts
Plants are eukaryotes that have membrane-bound organelles. The chloroplast is the
organelle in plant cells that contains chlorophyll and is the site where photosynthesis
occurs.
Which of the following is true about the formation of a covalent bond?
A.A covalent bond forms when electrons are shared between two atoms.
B.A covalent bond forms when one atom donates protons to another atom.
C.A covalent bond forms when two negatively charged atoms become attached to each
other.
D.A covalent bond forms when the neutrons of one atom fuse with the neutrons of
another atom. - ANS-A.A covalent bond forms when electrons are shared between two
atoms.
A covalent bond involves the sharing of one or more pairs of electrons between two
atoms.
Which of the following demonstrations provides the best opportunity for students to gain
an understanding of why the Sun appears larger than other stars, even though many
stars are actually larger than the Sun?
A.Positioning two lit bulbs of the same size on opposite sides of an observer but at the
same distance from the observer
B.Positioning two lit bulbs of the same size at different distances from an observer
C.Positioning a large lit bulb and a small lit bulb at the same distance from an observer
Test Questions and Answers
The process by which a gas becomes a liquid is called
A.condensation
B.freezing
C.melting
D.reduction - ANS-A.condensation
Condensation is the process by which a gas becomes a liquid.
Which of the following human organs is responsible for the formation of sperm cells?
A.Pancreas
B.Thyroid
C.Ovary
D.Testis - ANS-D.Testis
In human males, the testis is the organ in which the formation of sperm cells occurs.
Which of the following best describes the approximate length of time it takes Earth to
rotate once about its axis?
A.One hour
B.One day
C.One month
D.One year - ANS-B.One day
On average, it takes 24 hours, or one day, for Earth to rotate once about its axis. The
rotation of Earth about its axis leads to the cycle of day and night.
Which THREE of the following are generally acceptable rules for laboratory activities?
A.Students should wash their hands after mixing chemicals in the laboratory.
B.Students should inform the teacher immediately of any accidents or spills in the
laboratory.
C.Students should use cracked glassware only when the teacher is in the laboratory.
D.Students should read instructions thoroughly before performing laboratory
procedures. - ANS-A.Students should wash their hands after mixing chemicals in the
laboratory.
,B.Students should inform the teacher immediately of any accidents or spills in the
laboratory.
D.Students should read instructions thoroughly before performing laboratory procedures
To prevent accidental ingestion or absorption of potentially harmful substances,
students should wash their hands after working with chemicals. To help maintain a safe
environment, accidents and spills in the laboratory should be reported to the teacher
immediately so that a correct response can be implemented. To safely and effectively
complete laboratory procedures, students should read instructions thoroughly before
starting the procedures. Cracked glassware is a safety hazard and should never be
used.
Which of the following processes most directly involves the movement of water from the
atmosphere to Earth's surface?
A.Infiltration
B.Precipitation
C.Transpiration
D.Sublimation - ANS-B.Precipitation
Precipitation is the process by which atmospheric water falls to Earth's surface in the
form of rain, hail, sleet, or snow. Because atmospheric water returns to Earth's surface
primarily through the process of precipitation, it is an important part of the water cycle.
Infiltration is the process by which water on Earth's surface enters the subsurface soil
and rock. Transpiration is the process by which water evaporates from plant leaves and
enters the atmosphere. Sublimation is the process by which a substance transitions
directly from the solid phase to the gas phase without going through the liquid phase.
The characteristics presented are typical of frogs. Frogs belong to the class Amphibia,
which also includes toads and salamanders.
In an activity, students filled two identical containers with equal volumes of either
freshwater or salt water. The students then placed different objects, one at a time, in the
containers and observed whether the objects sank or floated. Which of the following
statements best accounts for an observation that the same object sank in the freshwater
but floated in the salt water?
A.The freshwater was colder than the salt water.
B.The freshwater weighed more than the salt water.
C.The salt water was denser than the freshwater.
D.The salt water was more transparent than the freshwater. - ANS-C.The salt water was
denser than the freshwater.
An object will sink in a liquid if its density is greater than that of the liquid, and it will float
if its density is less than or equal to that of the liquid. The observation that the same
, object sank in the freshwater but floated in the salt water is best accounted for by
concluding that the salt water is denser than both the object and the freshwater.
Which of the following elements are most abundant in the Sun?
A.Hydrogen and helium
B.Oxygen and carbon
C.Nitrogen and phosphorus
D.Uranium and plutonium - ANS-A.Hydrogen and helium
The composition of the Sun is approximately 99.9% hydrogen and helium.
In plants, the chlorophyll used in photosynthesis is contained in which of the following
cell structures?
A.The cell wall
B.The nucleus
C.The mitochondria
D.The chloroplasts - ANS-D.The chloroplasts
Plants are eukaryotes that have membrane-bound organelles. The chloroplast is the
organelle in plant cells that contains chlorophyll and is the site where photosynthesis
occurs.
Which of the following is true about the formation of a covalent bond?
A.A covalent bond forms when electrons are shared between two atoms.
B.A covalent bond forms when one atom donates protons to another atom.
C.A covalent bond forms when two negatively charged atoms become attached to each
other.
D.A covalent bond forms when the neutrons of one atom fuse with the neutrons of
another atom. - ANS-A.A covalent bond forms when electrons are shared between two
atoms.
A covalent bond involves the sharing of one or more pairs of electrons between two
atoms.
Which of the following demonstrations provides the best opportunity for students to gain
an understanding of why the Sun appears larger than other stars, even though many
stars are actually larger than the Sun?
A.Positioning two lit bulbs of the same size on opposite sides of an observer but at the
same distance from the observer
B.Positioning two lit bulbs of the same size at different distances from an observer
C.Positioning a large lit bulb and a small lit bulb at the same distance from an observer
