ATI TEAS VII Online Practice B – Science
Exam with Complete Solutions
"Dark matter" is a form of energy proposed to explain the repulsive forces between
matter in the universe. It has never been observed directly. Which of the following is the
best rationale for many scientists' contention that it exists?
It serves as a working hypothesis to explain real observations in the universe.
A basic scientific principle is to consider everything possible until proven otherwise.
Since light energy exists in the universe, dark energy must also exist.
Light energy from distant stars is very faint because it is absorbed by dark energy. -
ANSWER-It serves as a working hypothesis to explain real observations in the universe.
Often scientists will make such a working hypothesis and assume an entity that fits the
observed data. This strategy allows for experimental testing.
A blood pressure reading of 120/70 mm Hg refers to arterial pressures recorded during
which of the following events?
Atrial contraction/ventricular contraction
Atrial contraction/ventricular relaxation
Ventricular contraction/ventricular relaxation
Ventricular relaxation/atrial relaxation - ANSWER-Ventricular contraction/ventricular
relaxation
A blood pressure reading of 120 is peak arterial pressure during ventricular contraction
(ventricular systole); 70 refers to minimal pressure during ventricular relaxation
(ventricular diastole).
A chlorine atom has 17 electrons and 17 protons. It forms and ionic bond with sodium
and gains a negative charge. Which of the following is true for the chloride ion?
It is an anion with 18 electrons and 17 protons.
It is an anion with 18 electrons and 18 protons.
It is a cation with 17 electrons and 18 protons.
It is a cation with 18 electrons and 18 protons. - ANSWER-It is an anion with 18
electrons and 17 protons.
When a chlorine atom gains an electron, its negative charge increases by 1 and it is
now called an anion.
A student is assigned the task of measuring the weight of one tennis ball using a scale
for which the zero adjustment on the balance is not working. The student is given 3 balls
, and the can in which they were packaged. Which of the following strategies will provide
the best determination of the correct weight?
Weigh each ball separately and average the results.
Weigh the empty can, weigh the can with a ball in it, and compute the difference
between the two.
Weigh the three balls together and divide by three.
Weigh each ball separately, adjusting the beam weights from below first, and then from
above. Then, average the results. - ANSWER-Weigh the empty can, weigh the can with
a ball in it, and compute the difference between the two.
Finding the difference between the can with a ball in it and without a ball will provide the
weight of the ball.
A student observes that when the mercury rises and falls in a thermometer, the particles
do not stick to the sides of the glass tube. However, when honey is poured from one
glass container to another, the particles stick to the walls of the container. Which of the
following explains the observation?
Mercury is more cohesive and less adhesive than honey.
Mercury is less cohesive and more adhesive than honey.
Mercury is less cohesive and less adhesive than honey.
Mercury is more cohesive and more adhesive than honey. - ANSWER-Mercury is more
cohesive and less adhesive than honey.
Mercury atoms are more attracted to each other by cohesion than they are to glass by
adhesion, while honey has high adhesion and sticks immediately to the glass surface.
So, mercury rises and falls without any residue on the thermometer while honey sticks
to the container.
A student placed 20 mL NaOH solution in a beaker and added 5 mL of HCl to it. Which
of the following would happen when the two substances are mixed?
Hydrogen gas is released.
Carbon dioxide gas is produced.
The pH of the resultant solution is reduced.
The concentration of OH- ions is increased. - ANSWER-The pH of the resultant solution
is reduced.
Acids donate H+ ions, which combine with OH- ions to make water. The lower the
concentration of OH- ions, the lower the pH of the solution.
A student wants to study how friction affects the distance traveled by a marble on a
surface. A marble was pushed on four different surfaces with the same force and the
time taken for it to travel 1 meter was noted. What experimental term is used to define
the condition of pushing the marble with the same force on all 4 surfaces?
Exam with Complete Solutions
"Dark matter" is a form of energy proposed to explain the repulsive forces between
matter in the universe. It has never been observed directly. Which of the following is the
best rationale for many scientists' contention that it exists?
It serves as a working hypothesis to explain real observations in the universe.
A basic scientific principle is to consider everything possible until proven otherwise.
Since light energy exists in the universe, dark energy must also exist.
Light energy from distant stars is very faint because it is absorbed by dark energy. -
ANSWER-It serves as a working hypothesis to explain real observations in the universe.
Often scientists will make such a working hypothesis and assume an entity that fits the
observed data. This strategy allows for experimental testing.
A blood pressure reading of 120/70 mm Hg refers to arterial pressures recorded during
which of the following events?
Atrial contraction/ventricular contraction
Atrial contraction/ventricular relaxation
Ventricular contraction/ventricular relaxation
Ventricular relaxation/atrial relaxation - ANSWER-Ventricular contraction/ventricular
relaxation
A blood pressure reading of 120 is peak arterial pressure during ventricular contraction
(ventricular systole); 70 refers to minimal pressure during ventricular relaxation
(ventricular diastole).
A chlorine atom has 17 electrons and 17 protons. It forms and ionic bond with sodium
and gains a negative charge. Which of the following is true for the chloride ion?
It is an anion with 18 electrons and 17 protons.
It is an anion with 18 electrons and 18 protons.
It is a cation with 17 electrons and 18 protons.
It is a cation with 18 electrons and 18 protons. - ANSWER-It is an anion with 18
electrons and 17 protons.
When a chlorine atom gains an electron, its negative charge increases by 1 and it is
now called an anion.
A student is assigned the task of measuring the weight of one tennis ball using a scale
for which the zero adjustment on the balance is not working. The student is given 3 balls
, and the can in which they were packaged. Which of the following strategies will provide
the best determination of the correct weight?
Weigh each ball separately and average the results.
Weigh the empty can, weigh the can with a ball in it, and compute the difference
between the two.
Weigh the three balls together and divide by three.
Weigh each ball separately, adjusting the beam weights from below first, and then from
above. Then, average the results. - ANSWER-Weigh the empty can, weigh the can with
a ball in it, and compute the difference between the two.
Finding the difference between the can with a ball in it and without a ball will provide the
weight of the ball.
A student observes that when the mercury rises and falls in a thermometer, the particles
do not stick to the sides of the glass tube. However, when honey is poured from one
glass container to another, the particles stick to the walls of the container. Which of the
following explains the observation?
Mercury is more cohesive and less adhesive than honey.
Mercury is less cohesive and more adhesive than honey.
Mercury is less cohesive and less adhesive than honey.
Mercury is more cohesive and more adhesive than honey. - ANSWER-Mercury is more
cohesive and less adhesive than honey.
Mercury atoms are more attracted to each other by cohesion than they are to glass by
adhesion, while honey has high adhesion and sticks immediately to the glass surface.
So, mercury rises and falls without any residue on the thermometer while honey sticks
to the container.
A student placed 20 mL NaOH solution in a beaker and added 5 mL of HCl to it. Which
of the following would happen when the two substances are mixed?
Hydrogen gas is released.
Carbon dioxide gas is produced.
The pH of the resultant solution is reduced.
The concentration of OH- ions is increased. - ANSWER-The pH of the resultant solution
is reduced.
Acids donate H+ ions, which combine with OH- ions to make water. The lower the
concentration of OH- ions, the lower the pH of the solution.
A student wants to study how friction affects the distance traveled by a marble on a
surface. A marble was pushed on four different surfaces with the same force and the
time taken for it to travel 1 meter was noted. What experimental term is used to define
the condition of pushing the marble with the same force on all 4 surfaces?
