21. the primary topic of the passage is which of the following?
(A) The interaction of the realms on the quantum ladder
(B) Atomic structures found on Earth, on other planets, and on the surfaces of stars
(C) Levels of energy that are released in nuclear reactions on Earth and in stars
(D) Particles and processes found in the atomic, nuclear, and subnuclear realms
(E) New types of particles occurring in the atomic realm
22. According to the passage, radioactivity that occurs naturally on Earth is the result of
(A) the production of particles that have no detectable mass or electric charge
(B) high energy exchanges on the nuclear level that occurred in an ancient explosion in a star
(C) processes that occur in the center of the Sun, which emits radiation to the Earth
(D) phenomena in the atomic realm that cause atoms and molecules to decompose into nuclei and electrons
(E) high-voltage discharges of electricity that took place in the atmosphere of the Earth shortly after the Earth was formed
18. If computers P, R, S, and T are the only ones operating, which of the following request for data can be made NEITHER directly NOR through exactly one of the other operating computers?
(A) A request by P for data from S
(B) A request by P for data from T
(C) A request by P for data from R
(D) A request by R for data from S
(E) A request by T for data from S
Questions 19-22
A map is being prepared that will represent the follow- ing seven provinces of a certain country: Gusaya, Isto- ria, Jacaranda, Luna, Praz, Serenia, and Venotia. Gusaya has common borders with all of the other six provinces on the map except Jacaranda. Istoria has common borders with exactly four other provinces-Gusaya, Jacaranda, Praz, and Venotia. Jacaranda has common borders with exactly two other provinces-Istoria and Praz. Luna has common borders with exactly two other provinces-Gusaya and Venotia. Praz has common borders with exactly three other provinces-Gusaya, Istoria, and Jacaranda. Serenia has a common border only with Gusaya. Venotia has common borders with exactly three other provinces-Gusaya, Istoria, and Luna.
Exactly six colors-gold, jade, olive, red, silver, and white-will be used in representing the seven provinces. Each color will be used at least once. Each province will be one solid color on the map. The following restric- tions apply to the map's colors: No province can be the same color as any province bordering on it. Jade and olive cannot be used for provinces border- ing on each other. Silver and white cannot be used for provinces bor- dering on each other. Gusaya must be red. Istoria must be jade.
19. Which of the following provinces can NEITHER be red NOR be jade on this map?
(A) Istoria (B) Jacaranda (C) Luna
(D) Praz (E) Serenia
20. Which of the following provinces could be olive on this map?
(A) Gusaya (B) Jacaranda (C) Praz
(D) Serenia (E) Venotia
21. If Venotia and Jacaranda are white on the map, Serenia must be
(A) gold (B) jade (C) olive (D) silver
(E) white
19. If J and M are scheduled for Thursday, which of the following must be true?
(A) G is scheduled for Monday.
(B) I is scheduled for Tuesday.
(C) L is scheduled for Wednesday.
(D) N is scheduled for Wednesday.
(E) O is scheduled for Monday.
Questions 20-22
A residential subdivision is accessible to vehicular traf- fic only as specified below:
All eight streets are one-way streets.
Access to the subdivision is at a single point F.
Exit from the subdivision is at a single point G.
The street intersections within the subdivision are W, X, Y, and Z.
Separate streets run directly
from F to W,
from W to X,
from W to Y,
from X to Z,
from X to W,
from Y to X,
from Z to Y, and
from Z to G.
20. Which of the following describes a possible route from F to G, including each of the intersections on that route?
(A) F-W-Z-G (B) F-Y-X-G
(C) F-W-X-Y-G (D) F-W-Y-X-G
(E) F-W-X-Z-G
21. For which of the following trips are there two alter- native routes that do not have a s
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