WGU D684 – Introduction to Computer Science Objective Assessment | OA (QEO2) | Questions and
Answers | 2026 Update | 100% Correct.
WGU D684 – Introduction to Computer Science
FULL 70-Question Timed Mock OA
Domain 1: Computer Science Foundations
1. Computer science is BEST described as the study of:
A. Physical computer components
B. Software development only
C. Computation and information processing
D. Networking hardware
Answer: C
2. What is an algorithm?
A. A programming language
B. A step-by-step method to solve a problem
C. A hardware instruction
D. A data storage unit
Answer: B
3. Which property is REQUIRED for an algorithm?
A. Must be fast
B. Must be written in code
C. Must have a finite number of steps
D. Must use loops
Answer: C
4. Abstraction allows computer scientists to:
A. Increase system complexity
B. Focus on unnecessary details
C. Simplify complex systems
D. Eliminate algorithms
Answer: C
,5. Which is a core area of computer science?
A. Accounting
B. Artificial intelligence
C. Marketing
D. Human resources
Answer: B
Domain 2: Hardware Fundamentals
6. What is the primary role of the CPU?
A. Store data permanently
B. Execute program instructions
C. Manage internet connections
D. Display output
Answer: B
7. Which component temporarily stores data in use?
A. SSD
B. Hard drive
C. RAM
D. ROM
Answer: C
8. Which component provides long-term storage?
A. Cache
B. RAM
C. Hard drive
D. Register
Answer: C
9. Which hardware component performs arithmetic operations?
A. Control unit
B. ALU
C. RAM
D. Cache
Answer: B
,10. Which is an example of an input device?
A. Monitor
B. Printer
C. Keyboard
D. Speaker
Answer: C
Domain 3: Software & Operating Systems
11. Software is BEST defined as:
A. Physical devices
B. Programs and instructions
C. Internet services
D. Computer memory
Answer: B
12. Which is system software?
A. Spreadsheet application
B. Word processor
C. Operating system
D. Web browser
Answer: C
13. The operating system’s primary responsibility is to:
A. Write programs
B. Manage hardware and software resources
C. Store user data
D. Provide internet access
Answer: B
14. Which OS feature allows multiple programs to run simultaneously?
A. File management
B. Multitasking
C. Scheduling
D. Virtualization
Answer: B
, 15. Firmware is BEST described as:
A. Temporary memory
B. Software embedded in hardware
C. Application software
D. Network software
Answer: B
Domain 4: Data Representation
16. Computers primarily use which number system?
A. Decimal
B. Binary
C. Hexadecimal
D. Octal
Answer: B
17. A bit represents:
A. A character
B. A byte
C. A single 0 or 1
D. A word
Answer: C
18. How many bits are in one byte?
A. 4
B. 6
C. 8
D. 16
Answer: C
19. ASCII is used to:
A. Encrypt data
B. Store images
C. Represent characters
D. Manage memory
Answer: C
Answers | 2026 Update | 100% Correct.
WGU D684 – Introduction to Computer Science
FULL 70-Question Timed Mock OA
Domain 1: Computer Science Foundations
1. Computer science is BEST described as the study of:
A. Physical computer components
B. Software development only
C. Computation and information processing
D. Networking hardware
Answer: C
2. What is an algorithm?
A. A programming language
B. A step-by-step method to solve a problem
C. A hardware instruction
D. A data storage unit
Answer: B
3. Which property is REQUIRED for an algorithm?
A. Must be fast
B. Must be written in code
C. Must have a finite number of steps
D. Must use loops
Answer: C
4. Abstraction allows computer scientists to:
A. Increase system complexity
B. Focus on unnecessary details
C. Simplify complex systems
D. Eliminate algorithms
Answer: C
,5. Which is a core area of computer science?
A. Accounting
B. Artificial intelligence
C. Marketing
D. Human resources
Answer: B
Domain 2: Hardware Fundamentals
6. What is the primary role of the CPU?
A. Store data permanently
B. Execute program instructions
C. Manage internet connections
D. Display output
Answer: B
7. Which component temporarily stores data in use?
A. SSD
B. Hard drive
C. RAM
D. ROM
Answer: C
8. Which component provides long-term storage?
A. Cache
B. RAM
C. Hard drive
D. Register
Answer: C
9. Which hardware component performs arithmetic operations?
A. Control unit
B. ALU
C. RAM
D. Cache
Answer: B
,10. Which is an example of an input device?
A. Monitor
B. Printer
C. Keyboard
D. Speaker
Answer: C
Domain 3: Software & Operating Systems
11. Software is BEST defined as:
A. Physical devices
B. Programs and instructions
C. Internet services
D. Computer memory
Answer: B
12. Which is system software?
A. Spreadsheet application
B. Word processor
C. Operating system
D. Web browser
Answer: C
13. The operating system’s primary responsibility is to:
A. Write programs
B. Manage hardware and software resources
C. Store user data
D. Provide internet access
Answer: B
14. Which OS feature allows multiple programs to run simultaneously?
A. File management
B. Multitasking
C. Scheduling
D. Virtualization
Answer: B
, 15. Firmware is BEST described as:
A. Temporary memory
B. Software embedded in hardware
C. Application software
D. Network software
Answer: B
Domain 4: Data Representation
16. Computers primarily use which number system?
A. Decimal
B. Binary
C. Hexadecimal
D. Octal
Answer: B
17. A bit represents:
A. A character
B. A byte
C. A single 0 or 1
D. A word
Answer: C
18. How many bits are in one byte?
A. 4
B. 6
C. 8
D. 16
Answer: C
19. ASCII is used to:
A. Encrypt data
B. Store images
C. Represent characters
D. Manage memory
Answer: C
