MCAT Physics - Exam Questions with
Verified Solutions
How much greater was the acceleration of the 10 kg disc with the larger stimulus
compared to the acceleration of this disc with the original stimulus?
A. 4.5 m/s^2
B. 4 m/s^2
C. 5 m/s^2
D. 10 m/s^2 - B
What is the final expected velocity for the 10 kg disc when it is lifted with a force of 145
N?
A. 0.60 m/s
B. 0.85 m/s
C. 1.20 m/s
D. 1.52 m/s - B
Which of the following is most likely the maximum disc mass that could be suspended
from an average frog muscle during an isometric contraction with maximal stimulation?
A. 10 kg
B. 12 kg
C. 16 kg
D. 22 kg - C
Which of the following is true of a disc at the moment when concentric contraction of the
muscle ceases and eccentric contraction begins?
A. Both its kinetic and gravitational potential energies are at a maximum.
B. Both its kinetic and gravitational potential energies are at a minimum.
C. Its kinetic energy is at a maximum and its gravitational potential energy is at a
minimum.
D. Its kinetic energy is at a minimum and its gravitational potential energy is at a
maximum. - D
Suppose the experiment is repeated at a very high altitude, where the force of gravity is
slightly lower. After adjusting the stimulation to the level needed to achieve isometric
contraction, concentric contraction is achieved by increasing the stimulation the same
amount that it was increasing during the original experiment. How will the results
,obtained during concentric contraction be different from those of the original
experiment?
A. Both the muscle force and the disc acceleration will be reduced.
B. Both the muscle force and the disc acceleration will be greater.
C. The muscle force will be the same, and the disc acceleration will be greater.
D. The muscle force will be reduced, and the disc acceleration will be the same. - D
If average IVA was calculated to be 3.2 m/s^2 and peak isometric myocardial velocity
was measured at 8 cm/s, how long did it take to reach peak velocity? Assume initial
myocardial velocity was 0 cm/s.
A. 0.25 s
B. 0.025 s
C. 40 s
D. 4 s - B
RVEF is positively correlated with right ventricle function. Compared to a healthy
patient, would a patient with pulmonary arterial hypertension be expected to have higher
or lower S' and IVA measurements?
A. Higher S' and lower IVA
B. Higher S' and higher IVA
C. Lower S' and higher IVA
D. Lower S' and lower IVA - D
As RVEF increases, would the force with which the right ventricle contracts decrease or
increase?
A. Decrease because IVA decreases
B. Decrease because IVA increases
C. Increase because IVA increases
D. Increase because IVA decreases - C
Blood returning to the right atrium from the lower extremities must flow against the force
of gravity, but the magnitude of blood flow velocity increases as blood moves from the
capillaries to the heart. Given that venous blood flow velocity is in the positive direction,
in which directions are net force and acceleration?
A. Both net force and acceleration are in the negative direction.
B. Net force is in the negative direction but acceleration is in the positive direction.
C. Net force is in the positive direction but acceleration is in the negative direction.
D. Both net force and acceleration are in the positive direction. - D
At the onset of ventricular diastole, the net forces acting on the leaflets of the tricuspid
valve are directed:
, A. into the right ventricle.
B. into the right atrium.
C. into the pulmonary artery.
D. into the venae cavae. - A
Which of the following would be true if red blood cell stiffness was overestimated?
A. The researchers would overestimate the mechanical force generated.
B. The researchers would underestimate the mechanical force generated.
C. The T cell would not be activated by the model APC.
D. The results would not be affected. - A
How much force would a T cell need to exert on a red blood cell in order to compress it
0.5 um?
A. 200 pN
B. 100 pN
C. 25 pN
D. 12.5 pN - C
What change to the experimental conditions would be most likely to decrease the
measured force?
A. Using a cell with a stiffness of 25 pN/um instead of a red blood cell
B. Administering Latrunculin A, a compound that prevents actin polymerization
C. Increasing the pH of the cellular medium that the experiment takes place in
D. Using a cell with a stiffness of 75 pN/um instead of a red blood cell - B
Which of the following could accurately describe changes in the velocity of an antigen-
presenting cell accelerated, first, by the pushing and, then, by the pulling forces exerted
by a T cell receptor? - B
One major source of discomfort and pain is the friction of direct contact between bones.
Which of the following affects the degree of friction between two bones that are in
contact?
I. Surface area of the bones that are in contact
II. The amount of force that each bone exerts on the other
III. Texture of each bone
A. I only
B. I and II
C. II and III
D. I, II, and III - C
Verified Solutions
How much greater was the acceleration of the 10 kg disc with the larger stimulus
compared to the acceleration of this disc with the original stimulus?
A. 4.5 m/s^2
B. 4 m/s^2
C. 5 m/s^2
D. 10 m/s^2 - B
What is the final expected velocity for the 10 kg disc when it is lifted with a force of 145
N?
A. 0.60 m/s
B. 0.85 m/s
C. 1.20 m/s
D. 1.52 m/s - B
Which of the following is most likely the maximum disc mass that could be suspended
from an average frog muscle during an isometric contraction with maximal stimulation?
A. 10 kg
B. 12 kg
C. 16 kg
D. 22 kg - C
Which of the following is true of a disc at the moment when concentric contraction of the
muscle ceases and eccentric contraction begins?
A. Both its kinetic and gravitational potential energies are at a maximum.
B. Both its kinetic and gravitational potential energies are at a minimum.
C. Its kinetic energy is at a maximum and its gravitational potential energy is at a
minimum.
D. Its kinetic energy is at a minimum and its gravitational potential energy is at a
maximum. - D
Suppose the experiment is repeated at a very high altitude, where the force of gravity is
slightly lower. After adjusting the stimulation to the level needed to achieve isometric
contraction, concentric contraction is achieved by increasing the stimulation the same
amount that it was increasing during the original experiment. How will the results
,obtained during concentric contraction be different from those of the original
experiment?
A. Both the muscle force and the disc acceleration will be reduced.
B. Both the muscle force and the disc acceleration will be greater.
C. The muscle force will be the same, and the disc acceleration will be greater.
D. The muscle force will be reduced, and the disc acceleration will be the same. - D
If average IVA was calculated to be 3.2 m/s^2 and peak isometric myocardial velocity
was measured at 8 cm/s, how long did it take to reach peak velocity? Assume initial
myocardial velocity was 0 cm/s.
A. 0.25 s
B. 0.025 s
C. 40 s
D. 4 s - B
RVEF is positively correlated with right ventricle function. Compared to a healthy
patient, would a patient with pulmonary arterial hypertension be expected to have higher
or lower S' and IVA measurements?
A. Higher S' and lower IVA
B. Higher S' and higher IVA
C. Lower S' and higher IVA
D. Lower S' and lower IVA - D
As RVEF increases, would the force with which the right ventricle contracts decrease or
increase?
A. Decrease because IVA decreases
B. Decrease because IVA increases
C. Increase because IVA increases
D. Increase because IVA decreases - C
Blood returning to the right atrium from the lower extremities must flow against the force
of gravity, but the magnitude of blood flow velocity increases as blood moves from the
capillaries to the heart. Given that venous blood flow velocity is in the positive direction,
in which directions are net force and acceleration?
A. Both net force and acceleration are in the negative direction.
B. Net force is in the negative direction but acceleration is in the positive direction.
C. Net force is in the positive direction but acceleration is in the negative direction.
D. Both net force and acceleration are in the positive direction. - D
At the onset of ventricular diastole, the net forces acting on the leaflets of the tricuspid
valve are directed:
, A. into the right ventricle.
B. into the right atrium.
C. into the pulmonary artery.
D. into the venae cavae. - A
Which of the following would be true if red blood cell stiffness was overestimated?
A. The researchers would overestimate the mechanical force generated.
B. The researchers would underestimate the mechanical force generated.
C. The T cell would not be activated by the model APC.
D. The results would not be affected. - A
How much force would a T cell need to exert on a red blood cell in order to compress it
0.5 um?
A. 200 pN
B. 100 pN
C. 25 pN
D. 12.5 pN - C
What change to the experimental conditions would be most likely to decrease the
measured force?
A. Using a cell with a stiffness of 25 pN/um instead of a red blood cell
B. Administering Latrunculin A, a compound that prevents actin polymerization
C. Increasing the pH of the cellular medium that the experiment takes place in
D. Using a cell with a stiffness of 75 pN/um instead of a red blood cell - B
Which of the following could accurately describe changes in the velocity of an antigen-
presenting cell accelerated, first, by the pushing and, then, by the pulling forces exerted
by a T cell receptor? - B
One major source of discomfort and pain is the friction of direct contact between bones.
Which of the following affects the degree of friction between two bones that are in
contact?
I. Surface area of the bones that are in contact
II. The amount of force that each bone exerts on the other
III. Texture of each bone
A. I only
B. I and II
C. II and III
D. I, II, and III - C
