WGU D386 OA EXAM / APPROVED WGU D386 HARDWARE AND OPERATING
SYSTEMS ESSENTIAL OBJECTIVE ASSESSMENT EXAM TEST BANK ACTUAL
2026/2027 PRACTICE QUESTIONS AND STUDY GUIDE ACCURATE EXAM
APPROVED QUESTIONS WITH WELL ELABORATED ANSWERS AND
RATIONALES (100% CORRECT VERIFIED ANSWERS) CURRENTLY UPDATED
VERSION 2026 EDITION |GUARANTEED SUCCESS A+ FULL REVISED WGU D386
HARDWARE AND OPERATING SYSTEMS ESSENTIAL OBJECTIVE ASSESSMENT
REAL EXAM|INSTANT DOWNLOAD PDF
1. Which component is considered the "brain" of the computer and is
responsible for executing instructions?
A) RAM
B) GPU
C) PSU
D) CPU
Correct Answer: D
Rationale: The Central Processing Unit (CPU) is the primary
component that processes instructions, performs calculations, and
manages the flow of information through the computer.
2. What is the primary function of the motherboard?
,A) To store data permanently
B) To connect and allow communication between all computer
components
C) To process data
D) To provide power to the computer
Correct Answer: B
Rationale: The motherboard is the main circuit board that
connects the CPU, RAM, storage devices, and other peripherals,
facilitating communication between all components.
3. Which type of memory is volatile and loses its contents when the
power is turned off?
A) ROM
B) HDD
C) RAM
D) SSD
Correct Answer: C
,Rationale: RAM (Random Access Memory) is volatile memory
that loses its contents when power is removed. ROM is non-
volatile and retains data without power.
4. What does a power supply unit (PSU) do?
A) Stores data
B) Converts AC power from the wall outlet into DC power for
computer components
C) Processes data
D) Connects peripheral devices
Correct Answer: B
Rationale: The power supply unit converts alternating current
(AC) from the wall outlet into direct current (DC) power that
computer components can use.
5. What is the principal function of a computer's operating system?
A) To provide a graphical user interface for users
B) To organize and manage I/O, processing, storage, and memory
functions
, C) To execute application software programs
D) To connect the computer to network resources
Correct Answer: B
Rationale: The operating system organizes and manages the major
functions of the computer, including I/O, processing, storage, and
memory. It enables hardware devices and application software to
work together as a cohesive system.
6. Which components make up the central processing unit (CPU)?
A) Control unit and cache memory
B) Arithmetic logic unit (ALU) and control unit (CU)
C) Registers and memory management unit
D) Clock and bus interface
Correct Answer: B
Rationale: The CPU consists primarily of the Arithmetic Logic
Unit (ALU), which performs arithmetic and logical operations,
and the Control Unit (CU), which orchestrates the fetching,
decoding, and execution of instructions.
SYSTEMS ESSENTIAL OBJECTIVE ASSESSMENT EXAM TEST BANK ACTUAL
2026/2027 PRACTICE QUESTIONS AND STUDY GUIDE ACCURATE EXAM
APPROVED QUESTIONS WITH WELL ELABORATED ANSWERS AND
RATIONALES (100% CORRECT VERIFIED ANSWERS) CURRENTLY UPDATED
VERSION 2026 EDITION |GUARANTEED SUCCESS A+ FULL REVISED WGU D386
HARDWARE AND OPERATING SYSTEMS ESSENTIAL OBJECTIVE ASSESSMENT
REAL EXAM|INSTANT DOWNLOAD PDF
1. Which component is considered the "brain" of the computer and is
responsible for executing instructions?
A) RAM
B) GPU
C) PSU
D) CPU
Correct Answer: D
Rationale: The Central Processing Unit (CPU) is the primary
component that processes instructions, performs calculations, and
manages the flow of information through the computer.
2. What is the primary function of the motherboard?
,A) To store data permanently
B) To connect and allow communication between all computer
components
C) To process data
D) To provide power to the computer
Correct Answer: B
Rationale: The motherboard is the main circuit board that
connects the CPU, RAM, storage devices, and other peripherals,
facilitating communication between all components.
3. Which type of memory is volatile and loses its contents when the
power is turned off?
A) ROM
B) HDD
C) RAM
D) SSD
Correct Answer: C
,Rationale: RAM (Random Access Memory) is volatile memory
that loses its contents when power is removed. ROM is non-
volatile and retains data without power.
4. What does a power supply unit (PSU) do?
A) Stores data
B) Converts AC power from the wall outlet into DC power for
computer components
C) Processes data
D) Connects peripheral devices
Correct Answer: B
Rationale: The power supply unit converts alternating current
(AC) from the wall outlet into direct current (DC) power that
computer components can use.
5. What is the principal function of a computer's operating system?
A) To provide a graphical user interface for users
B) To organize and manage I/O, processing, storage, and memory
functions
, C) To execute application software programs
D) To connect the computer to network resources
Correct Answer: B
Rationale: The operating system organizes and manages the major
functions of the computer, including I/O, processing, storage, and
memory. It enables hardware devices and application software to
work together as a cohesive system.
6. Which components make up the central processing unit (CPU)?
A) Control unit and cache memory
B) Arithmetic logic unit (ALU) and control unit (CU)
C) Registers and memory management unit
D) Clock and bus interface
Correct Answer: B
Rationale: The CPU consists primarily of the Arithmetic Logic
Unit (ALU), which performs arithmetic and logical operations,
and the Control Unit (CU), which orchestrates the fetching,
decoding, and execution of instructions.
