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Exam Code: MCAT
Exam Questions: 815
Medical College Admission Test: Verbal Reasoning, Biological Sciences, Physical Sciences, Writing Sample
Updated: 23 Sep, 2026
Question 1

Although nihilism is commonly defined as a form of extremist political thought, the term has a broader meaning.
Nihilism is in fact a complex intellectual stance with venerable roots in the history of ideas, which forms the
theoretical basis for many positive assertions of modern thought. Its essence is the systematic negation of all
perceptual orders and assumptions. A complete view must account for the influence of two historical
crosscurrents: philosophical skepticism about the ultimacy of any truth, and the mystical quest for that same
pure truth. These are united by their categorical rejection of the “known”.
The outstanding representative of the former current, David Hume (1711-1776), maintained that external reality
is unknowable, since sense impressions are actually part of the contents of the mind. Their presumed
correspondence to external “things” cannot be verified, since it can be checked only by other sense
impressions. Hume further asserts that all abstract conceptions turn out, on examination, to be generalizations
from sense impressions. He concludes that even such an apparently objective phenomenon as a cause-andeffect relationship between events may be no more than a subjective fabrication of the observer. Stanley Rosen
notes: “Hume terminates in skepticism because he finds nothing within the subject but individual impressions
and ideas.”
For mystics of every faith, the “experience of nothingness” is the goal of spiritual practice. Buddhist meditation
techniques involve the systematic negation of all spiritual and intellectual constructs to make way for the
apprehension of pure truth. St. John of the Cross similarly rejected every physical and mental symbolization of
God as illusory. St. John’s spiritual legacy is, as Michael Novak puts it, “the constant return to inner solitude, an
unbroken awareness of the emptiness at the heart of consciousness. It is a harsh refusal to allow idols to be
placed in the sanctuary. It requires also a scorching gaze upon all the bureaucracies, institutions, manipulators,
and hucksters who employ technology and its supposed realities to bewitch and bedazzle the psyche.”
Novak’s interpretation points to the way these philosophical and mystical traditions prepared the ground for the
political nihilism of the nineteenth and twentieth centuries. The rejection of existing social institutions and their
claims to authority is in the most basic sense made possible by Humean skepticism. The political nihilism of the
Russian intelligentsia combined this radical skepticism with a near mystical faith in the power of a new
beginning. Hence, their desire to destroy becomes a revolutionary affirmation; in the words of Stanley Rosen,
“Nihilism is an attempt to overcome or repudiate the past on behalf of an unknown and unknowable, yet hopedfor, future.” This fusion of skepticism and mystical re-creation can be traced in contemporary thought, for
example as an element in the counterculture of the 1960s.
The passage implies that the two strands of nihilist thought

Section: Verbal Reasoning 

Options :
Answer: A

Question 2

Suppose an α-particle starting from rest is accelerated through a 5 megavolt potential difference. What is the
final kinetic energy of the α-particle? 1

Section: Physical Sciences 

Options :
Answer: A

Question 3

The equation of state of an ideal gas is given by the ideal gas law: PV = nRT where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature of the gas. The gas particles in a container are constantly moving at various speeds. These speeds are characterized by the Maxwell shown in the figure below.

MCAT-part-1-page303-image25
If two particles collide, their velocities change. However, if the gas is in thermal equilibrium, the velocity
distribution of the gas as a whole will remain unchanged by the collision.
The average kinetic energy (E) of a gas particle is given by:
MCAT-part-1-page303-image24
Equation 1
where m is the mass of one particle and u is the root mean square speed (rms speed) of the gas particles:
MCAT-part-1-page303-image23
where N is the number of gas particles; this is different from the average speed. For an ideal gas, the kinetic
energy of all the particles is:
MCAT-part-1-page303-image22
Equation 2
where n is the number of moles of gas. Combining these equations gives:
MCAT-part-1-page303-image21
Equation 3 where M is the molar mass of the gas particles. The average distance a particle travels between collisions is known as the mean free path l. Intuitively, the mean free path (mfp) could be expected to be larger for gases at low pressure, since there is a lot of space between particles. Similarly, the mfp should be larger when the gas particles are small. The following expression for the mfp shows this to be correct.
MCAT-part-1-page303-image30
Equation 4
In this equation, s is the atomic diameter (typically on the order of 10-8), k is the Boltzmann constant, and P is
the pressure.
In addition to colliding with one another, gas particles also collide with the walls of their container. If the
container wall has a pinhole that is small compared to the mfp of the gas, and a pressure differential exists
across the wall, the particles will effuse (or escape) through this pinhole without disturbing the Maxwellian
distribution of the particles. The rate of effusion can be described by:
MCAT-part-1-page303-image29
Equation 5
Where neff is the number of moles of effusing particles, A is the area of the pinhole, P and P1 are the pressures
on the inside and outside of the container wall respectively, and P > P1.
Which of the following will have the smallest root mean square speed at 298K?

Section: Physical Sciences 

Options :
Answer: A

Question 4

Several techniques have been developed to determine the order of a reaction. The rate of a reaction cannot be
predicted on the basis of the overall equation, but can be predicted on the basis of the rate-determining step.
For instance, the following reaction can be broken down into three steps.
A + D → F + G
Step 1
A → B + C
(slow)
Step 2
B + D → E + F
(fast)
Step 3
E + C → G
(fast)
Reaction 1
In this case, the first step in the reaction pathway is the rate-determining step. Therefore, the overall rate of the
reaction must equal the rate of the first step, k1 [A] where k1 is the rate constant for the first step. (Rate
constants of the different steps are denoted by kx
, where x is the step number.)
In some cases, it is desirable to measure the rate of a reaction in relation to only one species. In a secondorder reaction, for instance, a large excess of one species is included in the reaction vessel. Since a relatively
small amount of this large concentration is reacted, we assume that the concentration essentially remains
unchanged. Such a reaction is called a pseudo first-order reaction. A new rate constant, k', is established, equal
to the product of the rate constant of the original reaction, k, and the concentration of the species in excess.
This approach is often used to analyze enzyme activity.
In some cases, the reaction rate may be dependent on the concentration of a short-lived intermediate. This can
happen if the rate-determining step is not the first step. In this case, the concentration of the intermediate must
be derived from the equilibrium constant of the preceding step. For redox reactions, the equilibrium can be
correlated with the voltage produced by two half-cells by means of the Nernst equation. This equation states
that at any given moment:
MCAT-part-3-page300-image146
Equation 1
When
a A + b B → c C + d D
Reaction 2
Note: R = 8.314 J/K·mol; F = 9.6485 × 104 C/mol.)
Catalysts are effective in increasing the rate of a reaction because they:

Section: Physical Sciences

Options :
Answer: D

Question 5

According to Piaget, which is the first stage of cognitive development?


Section: Biological Sciences 

Options :
Answer: A

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