WGU D316 – IT Foundations Final Prep
Exam (Latest Update 2026/2027)
Questions and Verified Answers | 100%
Correct | Grade A.
1. Which hardware component is considered the "brain" of a
computer because it executes instructions and processes data?
A. Motherboard
B. Central Processing Unit (CPU)
C. Hard Disk Drive (HDD)
D. Power Supply Unit (PSU)
Rationale: The Central Processing Unit (CPU) is responsible for executing
program instructions, performing calculations, and coordinating
operations between hardware components. It is commonly referred to
as the brain of the computer because virtually every computing task
depends on it.
2. What is the primary function of Random Access Memory (RAM)?
A. Store files permanently
B. Temporarily store data and programs currently in use
C. Supply power to the motherboard
D. Manage network communication
,Rationale: RAM provides temporary, high-speed storage for data and
applications actively being used by the CPU. Unlike storage drives, RAM
loses its contents when the computer is powered off, making it volatile
memory.
3. Which storage device typically provides the fastest read and write
performance?
A. Optical Disc
B. Magnetic Tape
C. Hard Disk Drive
D. Solid-State Drive (SSD)
Rationale: SSDs use flash memory with no moving mechanical parts,
allowing much faster access times, lower latency, improved durability,
and better overall system performance compared to traditional hard
disk drives.
4. Which component distributes electrical power to all internal
computer components?
A. CPU
B. RAM
C. Motherboard
D. Power Supply Unit (PSU)
Rationale: The PSU converts AC power from a wall outlet into regulated
DC voltages required by internal computer components. Without a
,functioning PSU, no hardware receives the electrical power necessary to
operate.
5. Which expansion slot is commonly used for installing a modern
graphics card?
A. PCI
B. AGP
C. ISA
D. PCI Express (PCIe) x16
Rationale: PCI Express x16 provides the high bandwidth required by
modern graphics cards. It has replaced older interfaces such as AGP and
PCI for graphics-intensive applications.
6. Which device converts digital computer signals into visual images
displayed on a monitor?
A. Sound Card
B. Network Interface Card
C. Graphics Processing Unit (GPU)
D. Power Supply
Rationale: The GPU processes graphical data and renders images,
videos, and animations for display. It significantly improves visual
performance in gaming, video editing, and professional graphics
applications.
, 7. Which type of memory retains its contents even after the
computer is powered off?
A. RAM
B. Cache Memory
C. Registers
D. Read-Only Memory (ROM)
Rationale: ROM is nonvolatile memory that permanently stores
firmware needed during system startup. Unlike RAM, ROM retains its
contents even when electrical power is removed.
8. What is the primary purpose of a computer's BIOS or UEFI
firmware?
A. Store user files
B. Initialize hardware and start the operating system
C. Manage internet connections
D. Increase processor speed
Rationale: BIOS and UEFI perform hardware initialization during startup,
conduct diagnostic tests, and locate a bootable operating system. UEFI
is the modern replacement for legacy BIOS and offers additional security
and functionality.
9. Which connector is commonly used to transmit both digital audio
and video to a monitor?
A. VGA
B. PS/2
Exam (Latest Update 2026/2027)
Questions and Verified Answers | 100%
Correct | Grade A.
1. Which hardware component is considered the "brain" of a
computer because it executes instructions and processes data?
A. Motherboard
B. Central Processing Unit (CPU)
C. Hard Disk Drive (HDD)
D. Power Supply Unit (PSU)
Rationale: The Central Processing Unit (CPU) is responsible for executing
program instructions, performing calculations, and coordinating
operations between hardware components. It is commonly referred to
as the brain of the computer because virtually every computing task
depends on it.
2. What is the primary function of Random Access Memory (RAM)?
A. Store files permanently
B. Temporarily store data and programs currently in use
C. Supply power to the motherboard
D. Manage network communication
,Rationale: RAM provides temporary, high-speed storage for data and
applications actively being used by the CPU. Unlike storage drives, RAM
loses its contents when the computer is powered off, making it volatile
memory.
3. Which storage device typically provides the fastest read and write
performance?
A. Optical Disc
B. Magnetic Tape
C. Hard Disk Drive
D. Solid-State Drive (SSD)
Rationale: SSDs use flash memory with no moving mechanical parts,
allowing much faster access times, lower latency, improved durability,
and better overall system performance compared to traditional hard
disk drives.
4. Which component distributes electrical power to all internal
computer components?
A. CPU
B. RAM
C. Motherboard
D. Power Supply Unit (PSU)
Rationale: The PSU converts AC power from a wall outlet into regulated
DC voltages required by internal computer components. Without a
,functioning PSU, no hardware receives the electrical power necessary to
operate.
5. Which expansion slot is commonly used for installing a modern
graphics card?
A. PCI
B. AGP
C. ISA
D. PCI Express (PCIe) x16
Rationale: PCI Express x16 provides the high bandwidth required by
modern graphics cards. It has replaced older interfaces such as AGP and
PCI for graphics-intensive applications.
6. Which device converts digital computer signals into visual images
displayed on a monitor?
A. Sound Card
B. Network Interface Card
C. Graphics Processing Unit (GPU)
D. Power Supply
Rationale: The GPU processes graphical data and renders images,
videos, and animations for display. It significantly improves visual
performance in gaming, video editing, and professional graphics
applications.
, 7. Which type of memory retains its contents even after the
computer is powered off?
A. RAM
B. Cache Memory
C. Registers
D. Read-Only Memory (ROM)
Rationale: ROM is nonvolatile memory that permanently stores
firmware needed during system startup. Unlike RAM, ROM retains its
contents even when electrical power is removed.
8. What is the primary purpose of a computer's BIOS or UEFI
firmware?
A. Store user files
B. Initialize hardware and start the operating system
C. Manage internet connections
D. Increase processor speed
Rationale: BIOS and UEFI perform hardware initialization during startup,
conduct diagnostic tests, and locate a bootable operating system. UEFI
is the modern replacement for legacy BIOS and offers additional security
and functionality.
9. Which connector is commonly used to transmit both digital audio
and video to a monitor?
A. VGA
B. PS/2
