MCAT Questions Study Guide Rated A+

CO2(g) + H2O(g) with a total pressure of 1.2 torr. What is the partial pressure of H2O(g)?
A. 0.4 torr
B. 0.6 torr
C. 0.8 torr
D. 1.2 torr
The fundamental, resonant wavelength of a pipe open at both ends that is 1 m long and 0.1 m in diameter is:
A. 0.1 m
B. 0.2 m
C. 1.0 m
D. 2.0 m
Mechanica waves in a medium such as water function to transport:
A. matter only
B. energy only
C. both matter and energy
D. neither matter nor energy
What kind of object is emitted in the decay of 40K to 40Ar?
A. a gamma ray
B. and alpha particle
C. an electron
D. a positron
Which of the following changes to a circuit will decrease the electric field between a cathode and an anode by the greatest amount?
A. increasing the distance of the electrodes by a factor of 2
B. decreasing the distance of the electrodes by a factor of 2
C. increasing the resistance by a factor of 2
D. decreasing the resistance by a factor of 2
When the number of photons incident on the cathode with energies above the value of the work function increases, which of the following quantities also increases?
A. number o electrons ejected
B. potential energy of each ejected electron
C. magnitude of the electric field between the electrodes
D. speed of electrons at the anode
Which of the following best describes the movement of an electron after it is ejected from a cathode?
A. it is stationary until collisions propel it toward the anode
B. it moves with constant speed toward the anode
C. it accelerates toward the anode
D. it exits through a side of the vacuum photodiode
When the current in a circuit is 1 x 10^-3 A, what power is dissipated as heat in the resistor with a resistance of 1 x 10^2 ohms?
A. 1 x 10^-6 W
B. 1 x 10^-4 W
C. 1 x 10^-2 W
D. 1 x 10^ -1 W
A far-sighted person can see objects clearly no closer than 300 cm away. What is the minimum distance from a plane this person must be to see his reflection clearly?
A. 75 cm
B. 150 cm
C. 300 cm
D. 600 cm
Hyperglycemia of allows some animals to undergo extreme cold conditions. Which of the following would support this hypothesis?
A. suppression of insulin secretion during extreme cold
B. suppression of glucagon secretion during extreme cold
C. slowing of glycogen catabolism in the liver during extreme cold
D. increased sensetivity of all pancreatic endocrine responses during extreme cold
A sample of acid has a melting point of 189 C. If the sample is contaminated. what can be determined about the melting point of this mixture?
A. the melting will have a broad melting range above 189 C.
B. the mixture will have a broad melting range below 189 C
C. the mixture will have a sharp melting point of 186 C
D. the mixture will have a sharp melting point of 189 C
At the end of a person's hospital stay, a few E. coli cells remained in the patient's colon, even though he was taking antibiotics. These cells were most likely present because:
A. the antibiotics caused drug-resistance mutation to occur in bacterial DNA
B. the bacteria in the patient developed an immune reaction to the antibiotics
C. the patient's colon cells became increasingly resistant to the antibiotics
D. chance mutation in a few E. coli before treatment made these cells and their descendants antibiotic-resistant
E coli produces vitamins. If the E. coli population in the colon is severely reduced to due to extended antibiotic treatment, which of the following effects on digestion and nutrition are most likely to occur.
A. deficiencies of necessary digestive enzymes
B. deficiencies of specific vitamins
C. intestinal tract infections due to increased bacterial populations
D. greatly reduced absorption of caloric nutrients
Would an increase in the level of plasma aldosterone be expected to follow the ingestion of excessive quantities of NaCl?
A. no; aldosterone causes Na+ reabsorption by the kidney tubules
B. no; aldosterone causes Na+ secretion by kidney tubules
C. yes; aldosterone causes Na+ reabsorption by kidney tubules
D. yes; aldosterone causes Na+ secretion by kidney tubules
What is the ΔS of the following reaction? 2O3 --> 3O2
S O3: 238.8
S O2: 205.0
If ocean waves strike the shore every 3.0s and the horizontal distance between adjacent crests and troughs is 1.0 m, what is the average speed of the waves?
A. 0.33 m/s
B. 0.67 m/s
C. 1.5 m/s
D. 3.0 m/s
What mass of CDP (403 g/mol) is in a 10 mL solution of a 16mmol concentration?
A. 6.4 x 10^-4
B. 6.4 x 10^-3
C. 6.4 x 10 ^-2
D. 6.4 x 10^-1
When a strip of Cu is placed into H2O, no change is observed. However, when a strip of Cu is placed into a solution of HNO3, a gas evolves. What is the most likely identity of the gas?
A. NO
B. CO2
C. H2
D. O3
Electrons in which of the following orbitals of Ti (electron configuration of [Ar] 4s2 3d2) participate in forming bonds with another substance?
A. 2s
B. 3d
C. 4p
D. 5f--> speed vary with time?
A. it was constant in time
B. It increased exponentially with time
C. it was first constant, then increased linearly with time
D. it increased linearly with time
N2 has a lower boiling point than O2. which of the following best accounts for this difference?
A. N2 is less reactive than O2
B. N2 is less electronegative than O2
C. N2 has a lower [Show Less]