Multiply Choice

1. The concept of duality means that an REA diagram must consist of
a. Two events—one of them economic and the other support.
b. Two agents—one of them internal and the other external.
c. Two resources—one increased and the other decreased by the same event.
d. All of the above.
e. None of the above.

2. Each economic event in an REA diagram is always
a. linked to at least two resource entities.
b. linked to two external agents.
c. linked to two internal agents.
d. linked to another economic event.
e. linked to a support event.

3. Which of the following are characteristics of economic agents?
a. They participate in economic events, but do not assume control of the resources.
b. They participate in economic events, but not in support events.
c. Internal agents are employees of the company whose system is being modeled.
d. External agents are not employees of the company whose system is being modeled.
e. All of the above describe agents.

4. Which of the following is true?
a. REA diagram entities are arranged in constellations by entity class.
b. ER diagrams present a static picture of the underlying business phenomena.
c. Entity names in ER diagrams are always in the noun form.
d. Events entity names in REA diagrams are in the verb form.
e. All of the above are true statements.

5. Which of the following events would be LEAST likely to be modeled in an REA diagram?
a. Customer inquiries
b. Sales to a customer
c. Accounts payable
d. Cash
e. All of these events would be modeled

6. Which of the following associations would most likely describe the relationship between an internal agent and an economic event?
a. l:M
b. 1:1
c. M: M
d. O: M
e. none of the above

7. Which of the following tables would most likely have a composite key?
a. Take Order
b. Ship Goods
c. Inventory-Ship Link
d. Cash
e. None of the above

8. Which of the following associations requires a separate table in the database?
a. 1:1
b. l:M
c. M: M
d. All of the above

9. When assigning foreign keys in a 1: 1 association
a. The primary key of each table should be embedded as a foreign key in the related table.
b. The primary key on the 0, 1 side of the relation should be embedded as the foreign key on the 1, 1 side.
c. The primary key on the 1, 1 side of the relation should be embedded as the foreign key on the 0, 1 side.
d. a link table must be created to accept the foreign keys of both tables.
e. none of the above is true.

10. When assigning foreign keys in a 1: M association
a. The primary key of each table should be embedded as a foreign key in the related table.
b. The primary key on the 0, M side of the relation should be embedded as the foreign key on the 1, 1 side.
c. The primary key on the 1, 1 side of the relation should be embedded as the foreign key on the 0, M side.
d. A link table must be created to accept the foreign keys of both tables.
e. None of the above is true.