CompTIA A+ Certification Exam (Core 1
& Core 2) Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
Question 1
Which component is responsible for performing arithmetic and logical operations
in a computer system?
A. RAM
B. Hard Drive
C. CPU
D. Power Supply
C. CPU
The CPU (Central Processing Unit) is the primary processing component of a
computer and is responsible for executing instructions, performing arithmetic
calculations, and making logical decisions. It acts as the “brain” of the system,
coordinating operations between hardware and software. RAM only stores
temporary data, the hard drive stores persistent data, and the power supply
distributes electrical power, but none of these perform processing tasks.
Question 2
Which type of memory is volatile and loses data when power is turned off?
A. SSD
B. ROM
,C. RAM
D. BIOS
C. RAM
RAM (Random Access Memory) is volatile memory used for temporarily storing
data and instructions currently in use by the system. When power is lost, all data
in RAM is erased. SSDs and ROM are non-volatile, meaning they retain data
without power. BIOS firmware is stored in non-volatile memory on the
motherboard.
Question 3
Which port is commonly used for modern high-definition video and audio
transmission?
A. VGA
B. DVI
C. HDMI
D. PS/2
C. HDMI
HDMI (High-Definition Multimedia Interface) transmits both digital video and
audio signals over a single cable, making it the standard for modern displays,
TVs, and monitors. VGA and DVI are older video-only or limited audio-capable
interfaces, while PS/2 is used for legacy keyboard and mouse connections.
Question 4
What is the primary purpose of an operating system?
A. Manage hardware and software resources
B. Perform hardware repairs
C. Manufacture system drivers
D. Replace BIOS firmware
,A. Manage hardware and software resources
The operating system acts as an intermediary between hardware and
applications, managing CPU usage, memory allocation, file systems, and device
communication. It ensures applications can run efficiently while coordinating
system resources. It does not repair hardware, manufacture drivers, or replace
firmware.
Question 5
Which device converts AC power to DC power for computer components?
A. UPS
B. Power Supply Unit
C. Surge Protector
D. Voltage Regulator
B. Power Supply Unit
The Power Supply Unit (PSU) converts alternating current (AC) from a wall outlet
into direct current (DC) required by internal computer components. A UPS
provides backup power, a surge protector protects against voltage spikes, and a
voltage regulator stabilizes voltage but does not convert AC to DC.
Question 6
Which wireless standard is commonly used for short-range device connectivity like
headphones and keyboards?
A. NFC
B. Bluetooth
C. Wi-Fi
D. LTE
B. Bluetooth
Bluetooth is designed for short-range, low-power wireless communication
between devices such as headphones, keyboards, mice, and smartphones. Wi-Fi
, is used for local networking, NFC is for very close contact communication, and
LTE is a cellular standard.
Question 7
What is the function of a firewall?
A. Increase CPU speed
B. Block unauthorized network access
C. Store backup data
D. Defragment hard drives
B. Block unauthorized network access
A firewall monitors and controls incoming and outgoing network traffic based
on security rules. It helps prevent unauthorized access to or from private
networks. It does not affect CPU performance, store data, or perform disk
maintenance tasks like defragmentation.
Question 8
Which storage device uses spinning magnetic platters?
A. SSD
B. HDD
C. RAM
D. Flash drive
B. HDD
A Hard Disk Drive (HDD) uses spinning magnetic platters and mechanical
read/write heads to store and retrieve data. SSDs use flash memory with no
moving parts, RAM is temporary memory, and flash drives use solid-state
storage.
Question 9
& Core 2) Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
Question 1
Which component is responsible for performing arithmetic and logical operations
in a computer system?
A. RAM
B. Hard Drive
C. CPU
D. Power Supply
C. CPU
The CPU (Central Processing Unit) is the primary processing component of a
computer and is responsible for executing instructions, performing arithmetic
calculations, and making logical decisions. It acts as the “brain” of the system,
coordinating operations between hardware and software. RAM only stores
temporary data, the hard drive stores persistent data, and the power supply
distributes electrical power, but none of these perform processing tasks.
Question 2
Which type of memory is volatile and loses data when power is turned off?
A. SSD
B. ROM
,C. RAM
D. BIOS
C. RAM
RAM (Random Access Memory) is volatile memory used for temporarily storing
data and instructions currently in use by the system. When power is lost, all data
in RAM is erased. SSDs and ROM are non-volatile, meaning they retain data
without power. BIOS firmware is stored in non-volatile memory on the
motherboard.
Question 3
Which port is commonly used for modern high-definition video and audio
transmission?
A. VGA
B. DVI
C. HDMI
D. PS/2
C. HDMI
HDMI (High-Definition Multimedia Interface) transmits both digital video and
audio signals over a single cable, making it the standard for modern displays,
TVs, and monitors. VGA and DVI are older video-only or limited audio-capable
interfaces, while PS/2 is used for legacy keyboard and mouse connections.
Question 4
What is the primary purpose of an operating system?
A. Manage hardware and software resources
B. Perform hardware repairs
C. Manufacture system drivers
D. Replace BIOS firmware
,A. Manage hardware and software resources
The operating system acts as an intermediary between hardware and
applications, managing CPU usage, memory allocation, file systems, and device
communication. It ensures applications can run efficiently while coordinating
system resources. It does not repair hardware, manufacture drivers, or replace
firmware.
Question 5
Which device converts AC power to DC power for computer components?
A. UPS
B. Power Supply Unit
C. Surge Protector
D. Voltage Regulator
B. Power Supply Unit
The Power Supply Unit (PSU) converts alternating current (AC) from a wall outlet
into direct current (DC) required by internal computer components. A UPS
provides backup power, a surge protector protects against voltage spikes, and a
voltage regulator stabilizes voltage but does not convert AC to DC.
Question 6
Which wireless standard is commonly used for short-range device connectivity like
headphones and keyboards?
A. NFC
B. Bluetooth
C. Wi-Fi
D. LTE
B. Bluetooth
Bluetooth is designed for short-range, low-power wireless communication
between devices such as headphones, keyboards, mice, and smartphones. Wi-Fi
, is used for local networking, NFC is for very close contact communication, and
LTE is a cellular standard.
Question 7
What is the function of a firewall?
A. Increase CPU speed
B. Block unauthorized network access
C. Store backup data
D. Defragment hard drives
B. Block unauthorized network access
A firewall monitors and controls incoming and outgoing network traffic based
on security rules. It helps prevent unauthorized access to or from private
networks. It does not affect CPU performance, store data, or perform disk
maintenance tasks like defragmentation.
Question 8
Which storage device uses spinning magnetic platters?
A. SSD
B. HDD
C. RAM
D. Flash drive
B. HDD
A Hard Disk Drive (HDD) uses spinning magnetic platters and mechanical
read/write heads to store and retrieve data. SSDs use flash memory with no
moving parts, RAM is temporary memory, and flash drives use solid-state
storage.
Question 9
