тест selory / 52
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CS403: Certificate Final Exam: Attempt review | Saylor Academy |
https://learn.saylor.org/mod/quiz/review.php?attempt=1602263&cmid=23178&showall=1 |
Back to 'Certificate Final Exam\'
Started on |
Sunday, April 24, 2022, 6:14 AM |
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State |
Finished |
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Completed on |
Sunday, April 24, 2022, 6:40 AM |
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Time taken |
26 mins 15 secs |
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Points |
26.00/50.00 |
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Grade |
5.20 out of 10.00 (52%) |
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Question 1 |
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Which of the following selections best describes information? |
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0.00 points out |
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Select one: |
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of 1.00 |
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a. |
Letters |
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b. |
Data plus semantics |
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c. Letters that spell a word |
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d. A number and its data type |
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Question 2
Correct
1.00 points out of 1.00
Which of the following is data?
Select one: 
a. 32
b. I am 32
c. It is 32 degrees.
d. It is 32 outside.
Question 3 |
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What is one of the disadvantages of file processing systems? |
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Select one: |
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a. |
Low data quality |
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b. |
Limited data sharing |
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c. |
Short development time |
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d. |
Program-data independence |
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Question 4 |
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Which of the following sets of terms describes the data in a database? |
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1.00 points out |
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Select one: |
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a. |
integrated and shared |
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b. |
redundant and accurate |
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c. |
functional and redundant |
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d. |
transactional and unconstrained |
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1 of 15 |
4/24/22, 13:40 |
CS403: Certificate Final Exam: Attempt review | Saylor Academy |
https://learn.saylor.org/mod/quiz/review.php?attempt=1602263&cmid=23178&showall=1 |
Question 5 |
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What are databases generally used for today? |
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1.00 points out |
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Select one: |
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of 1.00 |
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a. |
Backing up hard drives or other storage disks |
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b. |
Recording the behavior of real time embedded systems |
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c. |
Storing and retrieving enterprise data for business systems |
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d. |
Performing computations for scientific and engineering application systems |
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Question 6 |
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A DBMS primarily supports a database for which of the following activities of the database's life-cycle? |
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Correct |
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1.00 points out |
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Select one: |
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a. |
Design |
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b. |
Testing |
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c. |
Usage |
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d. |
Requirements elicitation |
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Question 7 |
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To support concurrent transactions, a DBMS should have which of the following properties? |
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Correct |
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1.00 points out |
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Select one: |
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a. |
atomicity, durability, and isolation |
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b. |
atomicity, irreducibility, and isolation |
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c. |
durability, irreducibility, and isolation |
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d. |
atomicity, durability, and irreducibility |
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Question 8 |
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Which of the following are the most widely-used types of database today? |
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Incorrect |
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0.00 points out |
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Select one: |
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a. |
Network |
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b. |
Relational |
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c. |
Hierarchical |
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d. |
Object-oriented |
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Question 9 |
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What kind of database corresponds to 'table'? |
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Correct |
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1.00 points out |
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Select one: |
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of 1.00 |
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a. |
Network |
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b. |
Relational |
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c. |
Hierarchical |
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d. |
Object-oriented |
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2 of 15 |
4/24/22, 13:40 |
CS403: Certificate Final Exam: Attempt review | Saylor Academy |
https://learn.saylor.org/mod/quiz/review.php?attempt=1602263&cmid=23178&showall=1 |
Question 10 |
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Logical data independence allows modifications of what without rewriting application programs? |
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Incorrect |
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0.00 points out |
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Select one: |
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a. |
User view |
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b. |
Table contents |
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c. |
Logical schema |
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d. |
Physical schema |
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Question 11 |
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Which view in the three-level database architecture offers a formal description of the data with no concern for how it will be stored? |
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Correct |
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1.00 points out |
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Select one: |
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of 1.00 |
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a. |
Conceptual |
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b. |
Data |
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c. |
External |
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d. |
Internal |
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Question 12 |
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A link can be established between two tables by the use of what kind of key? |
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Correct |
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1.00 points out |
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Select one: |
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of 1.00 |
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a. |
foreign |
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b. |
hash |
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c. |
national |
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d. |
primary |
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Question 13 |
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What is a value that a DBMS maps to a single element of a relation? |
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Correct |
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1.00 points out |
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Select one: |
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a. |
a key |
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b. |
a field value |
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c. |
a field name |
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d. |
a query value |
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Question 14 |
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What are rules that are valid for information in a database called? |
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Incorrect |
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0.00 points out |
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Select one: |
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of 1.00 |
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a. |
constructs |
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b. |
constraints |
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c. |
foreign keys |
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d. |
primary keys |
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3 of 15 |
4/24/22, 13:40 |
CS403: Certificate Final Exam: Attempt review | Saylor Academy |
https://learn.saylor.org/mod/quiz/review.php?attempt=1602263&cmid=23178&showall=1 |
Question 15 |
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What did the predecessor to modern databases stored data in? |
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Correct |
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1.00 points out |
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Select one: |
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of 1.00 |
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a. |
Flat files |
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b. |
Rough files |
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c. |
Magnetic tape |
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d. |
Punched cards |
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Question 16 |
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If you were a database consultant tasked with recommending a data model for storing parts shared by large machinery for a manufacturing company, which of the following types of database would you recommend? |
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Incorrect |
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0.00 points out |
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Select one: |
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of 1.00 |
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a. |
Network |
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b. |
NoSQL |
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c. |
Object |
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d. |
Relational |
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Question 17 |
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A non-relational data model based on binary trees is which of the following models? |
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Incorrect |
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0.00 points out |
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Select one: |
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of 1.00 |
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a. |
Entity |
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b. |
Hierarchical |
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c. |
Network |
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d. |
Object |
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Question 18 |
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If you were a database consultant tasked with recommending a data model for a company that gathers data from the internet to identify information on trends in consumer behavior, which type of database would you recommend? |
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Incorrect |
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0.00 points out |
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Select one: |
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of 1.00 |
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a. |
Hierarchical |
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b. |
NoSQL |
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c. |
Object |
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d. |
Relational |
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Question 19
Correct
1.00 points out of 1.00
Which of the following statements describes the role of an E-R diagram in the development of a relational database?
Select one:
a. An E-R diagram is transformed into the database design.
b. An E-R diagram is transformed into the internal database.
c. An E-R diagram is transformed into the physical database.
d. An E-R diagram is used to represent the database requirements.
4 of 15 |
4/24/22, 13:40 |
CS403: Certificate Final Exam: Attempt review | Saylor Academy |
https://learn.saylor.org/mod/quiz/review.php?attempt=1602263&cmid=23178&showall=1 |
Question 20 |
What kind of relationship is this figure an example of? |
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Incorrect |
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0.00 points out |
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of 1.00 |
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Select one: |
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a. |
Binary |
b. |
Singleton |
c. |
Ternary |
d. |
Unary |
Question 21 |
What kind of relationship is this figure an example of? |
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Incorrect |
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0.00 points out |
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of 1.00 |
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Select one:
a. Binary
b. Ternary
c. Tributary
d. Unary
Question 22 |
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On an ER diagram, which shape is used to represent an entity? |
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Incorrect |
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0.00 points out |
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Select one: |
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a. |
Circle |
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b. |
Diamond |
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c. |
Oval |
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d. |
Rectangle |
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5 of 15 |
4/24/22, 13:40 |
CS403: Certificate Final Exam: Attempt review | Saylor Academy |
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Question 23
Correct
1.00 points out of 1.00
Question 24
Incorrect
0.00 points out of 1.00
Which of the following can we use to indicate whether an entity instance is mandatory?
Select one:
a. Cardinality
b. Optionality
c. Disjointedness
d. Referential integrity
Your answer is correct.
You have an application domain that consists of Cities, Towns, and Neighborhoods. A City has a name, zip code, state, and a country. A Town has a name, zip code, state, and country. A Neighborhood has a name, coordinate, and population. Using a relational m Students, Courses, and Sections called?
Select one:
a. Attributes
b. Constraints
c. Entities
d. Relations
Your answer is incorrect.
6 of 15 |
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CS403: Certificate Final Exam: Attempt review | Saylor Academy |
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Question 25
Incorrect
0.00 points out of 1.00
The diagram contains a unary entity which has a many-to-many relationship. Which of the following best demonstrates a mapping of the ERD to relations?
Select one:
a.
b.
c.
d. |
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Your answer is incorrect.
7 of 15 |
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CS403: Certificate Final Exam: Attempt review | Saylor Academy |
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Question 26
Correct
1.00 points out of 1.00
This figure shows an ER diagram that contains a many to many relationship and four possible ways to map the diagram to a set of relations. Which mapping is correct?
Select one:
a.
b. |
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c.
d.
Your answer is correct.
8 of 15 |
4/24/22, 13:40 |
CS403: Certificate Final Exam: Attempt review | Saylor Academy |
https://learn.saylor.org/mod/quiz/review.php?attempt=1602263&cmid=23178&showall=1 |
Question 27 |
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Which of the following is an additional constraint that is added by users or database administrators? |
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Correct |
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1.00 points out |
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Select one: |
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of 1.00 |
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a. |
Entity integrity |
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b. |
Domain integrity |
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c. |
Semantic integrity |
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d. |
Referential integrity |
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Question 28 |
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Which of the following statements about domain constraints is true? |
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Incorrect |
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0.00 points out |
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Select one: |
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a. |
They cannot be used in most modern database systems |
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b. |
They ensure values entered into a table satisfy conditions |
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c. |
They can only check numeric values for arithmetic relations |
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d. |
They cannot always be implemented in some SQL implementations |
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Question 29
Correct
1.00 points out of 1.00
In relational algebra, how would one select just the name from the student relation?
Select one:
a. Π (Student)
b. Π (Course)
c. ΠName (Student)
d. σname (Student)
Question 30 |
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What is a tuple? |
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Incorrect |
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0.00 points out |
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Select one: |
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a. |
A field in a relation |
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b. |
An index on a table |
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c. |
A way for a database to store tables |
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d. |
A collection of attributes of a relation |
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Question 31
Correct
1.00 points out of 1.00
Assuming that we have an additional relation called staff which is union compatible with faculty, what will the following operation result in?
Πname (Staff Instructor)
Select one:
a. No rows being printed
b. The cartesian product of instructor and staff
c. All rows of instructor being added to all rows of staff
d. The name of all rows which are in both staff and instructor
9 of 15 |
4/24/22, 13:40 |
CS403: Certificate Final Exam: Attempt review | Saylor Academy |
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Question 32
Correct
1.00 points out of 1.00
Which of the following is this operation an example of?
Student Course
Select one:
a. An equijoin
b. A hash join
c. A theta join
d. Aa natural join
Question 33
Correct
1.00 points out of 1.00
Which of the following is this operation an example of?
ΠName(Student) ΠCourseID(Course)
Select one:
a. An equijoin
b. A theta join
c. A natural join
d. A cartesian product
Question 34 |
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A relation is considered to be in Boyce-Codd normal form if and only if which of the following applies? |
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Incorrect |
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0.00 points out |
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Select one: |
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a. |
It is in fourth normal form |
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b. |
There are transitive dependencies |
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c. |
Every determinant is a candidate key |
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d. |
There are some partial functional dependencies |
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Question 35 |
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In what normal form is the relation in the figure? |
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Correct |
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1.00 points out |
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of 1.00 |
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Select one: |
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a. |
First normal form |
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b. |
Second normal form |
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c. |
Third normal form |
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d. |
Boyce-Codd normal form |
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Question 36 |
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Which of the following terms describes one attribute (or field) that determines the value of another attribute? |
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Incorrect |
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0.00 points out |
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Select one: |
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a. |
Foreign key |
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b. |
Primary key |
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c. |
Independent key |
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d. |
Functional dependency |
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10 of 15 |
4/24/22, 13:40 |