CompTIA A+ Certification Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. In a troubleshooting scenario aligned with the standards of the
CompTIA A+ Certification Examination, a technician is tasked with
diagnosing a desktop computer that powers on but displays no video
output, while fans and LEDs are active. Which of the following is the
MOST appropriate initial diagnostic step to isolate the issue?
A. Replace the power supply unit immediately
B. Verify monitor connection and test with a known-good display cable
C. Reinstall the operating system using recovery media
D. Replace the motherboard without further testing
Answer: B
Rationale: The most appropriate first step is to verify external components
such as monitor connections and cables, as no-display issues are commonly
caused by simple connectivity or peripheral faults before escalating to
hardware replacement.
2. A user reports that a laptop frequently overheats and shuts down
during intensive tasks. Which component is MOST likely responsible
for regulating internal thermal conditions and should be inspected
first?
,A. CMOS battery
B. Heat sink and cooling fan assembly
C. SSD firmware
D. Network interface card
Answer: B
Rationale: The heat sink and cooling fan are responsible for dissipating
heat from critical components, and failure or dust buildup in this assembly
is a common cause of overheating shutdowns.
3. A technician is replacing a failed hard drive in a modern desktop.
Which interface type typically provides the fastest data transfer rates
in current consumer systems?
A. IDE (PATA)
B. SATA I
C. SATA III
D. NVMe (PCIe-based SSD)
Answer: D
Rationale: NVMe SSDs using PCIe lanes provide significantly higher
throughput and lower latency than SATA-based drives, making them the
fastest storage option in modern systems.
4. A workstation repeatedly displays a “CMOS checksum error” during
boot. What is the MOST likely cause?
A. Corrupted operating system files
B. Dead or failing CMOS battery
C. Faulty GPU driver
D. Overheating CPU
Answer: B
Rationale: A CMOS checksum error commonly occurs when the CMOS
battery fails, causing BIOS settings to reset or become corrupted.
, 5. A user connects a printer via USB, but the system does not recognize
it. Which step should be performed FIRST?
A. Replace the printer immediately
B. Check Device Manager for driver errors and unknown devices
C. Reinstall the operating system
D. Replace the motherboard USB controller
Answer: B
Rationale: Checking Device Manager helps determine whether the system
detects the hardware and whether driver issues are preventing proper
recognition.
6. Which type of memory is MOST commonly used as system RAM in
modern laptops and desktops?
A. DDR SDRAM
B. Flash memory
C. ROM BIOS chips
D. Optical memory
Answer: A
Rationale: DDR SDRAM is the standard volatile memory used for system
RAM in modern computing devices due to its speed and efficiency.
7. A technician is configuring a small office network. Which device is
primarily responsible for directing traffic between multiple networks?
A. Switch
B. Hub
C. Router
D. Access point
Answer: C
Rationale: A router connects and directs data between different networks,
such as LANs and WANs, based on IP addressing.
, 8. A computer is experiencing intermittent shutdowns with no error
messages. Which power-related component should be tested FIRST?
A. GPU
B. Power supply unit
C. CPU cache
D. RAM timing
Answer: B
Rationale: The power supply unit is a common source of unstable or
intermittent shutdowns due to voltage irregularities or failure.
9. Which file system is MOST commonly used by Windows operating
systems for modern hard drives and SSDs?
A. EXT4
B. NTFS
C. FAT12
D. HFS+
Answer: B
Rationale: NTFS is the default file system for modern Windows operating
systems, supporting permissions, encryption, and large volumes.
10. A user reports that their wireless connection drops frequently.
Which tool is BEST for diagnosing signal strength and interference?
A. Disk Management
B. Wi-Fi analyzer application
C. Task Manager
D. Registry Editor
Answer: B
Rationale: A Wi-Fi analyzer provides real-time information about signal
strength and channel interference, helping identify wireless connectivity
issues.
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. In a troubleshooting scenario aligned with the standards of the
CompTIA A+ Certification Examination, a technician is tasked with
diagnosing a desktop computer that powers on but displays no video
output, while fans and LEDs are active. Which of the following is the
MOST appropriate initial diagnostic step to isolate the issue?
A. Replace the power supply unit immediately
B. Verify monitor connection and test with a known-good display cable
C. Reinstall the operating system using recovery media
D. Replace the motherboard without further testing
Answer: B
Rationale: The most appropriate first step is to verify external components
such as monitor connections and cables, as no-display issues are commonly
caused by simple connectivity or peripheral faults before escalating to
hardware replacement.
2. A user reports that a laptop frequently overheats and shuts down
during intensive tasks. Which component is MOST likely responsible
for regulating internal thermal conditions and should be inspected
first?
,A. CMOS battery
B. Heat sink and cooling fan assembly
C. SSD firmware
D. Network interface card
Answer: B
Rationale: The heat sink and cooling fan are responsible for dissipating
heat from critical components, and failure or dust buildup in this assembly
is a common cause of overheating shutdowns.
3. A technician is replacing a failed hard drive in a modern desktop.
Which interface type typically provides the fastest data transfer rates
in current consumer systems?
A. IDE (PATA)
B. SATA I
C. SATA III
D. NVMe (PCIe-based SSD)
Answer: D
Rationale: NVMe SSDs using PCIe lanes provide significantly higher
throughput and lower latency than SATA-based drives, making them the
fastest storage option in modern systems.
4. A workstation repeatedly displays a “CMOS checksum error” during
boot. What is the MOST likely cause?
A. Corrupted operating system files
B. Dead or failing CMOS battery
C. Faulty GPU driver
D. Overheating CPU
Answer: B
Rationale: A CMOS checksum error commonly occurs when the CMOS
battery fails, causing BIOS settings to reset or become corrupted.
, 5. A user connects a printer via USB, but the system does not recognize
it. Which step should be performed FIRST?
A. Replace the printer immediately
B. Check Device Manager for driver errors and unknown devices
C. Reinstall the operating system
D. Replace the motherboard USB controller
Answer: B
Rationale: Checking Device Manager helps determine whether the system
detects the hardware and whether driver issues are preventing proper
recognition.
6. Which type of memory is MOST commonly used as system RAM in
modern laptops and desktops?
A. DDR SDRAM
B. Flash memory
C. ROM BIOS chips
D. Optical memory
Answer: A
Rationale: DDR SDRAM is the standard volatile memory used for system
RAM in modern computing devices due to its speed and efficiency.
7. A technician is configuring a small office network. Which device is
primarily responsible for directing traffic between multiple networks?
A. Switch
B. Hub
C. Router
D. Access point
Answer: C
Rationale: A router connects and directs data between different networks,
such as LANs and WANs, based on IP addressing.
, 8. A computer is experiencing intermittent shutdowns with no error
messages. Which power-related component should be tested FIRST?
A. GPU
B. Power supply unit
C. CPU cache
D. RAM timing
Answer: B
Rationale: The power supply unit is a common source of unstable or
intermittent shutdowns due to voltage irregularities or failure.
9. Which file system is MOST commonly used by Windows operating
systems for modern hard drives and SSDs?
A. EXT4
B. NTFS
C. FAT12
D. HFS+
Answer: B
Rationale: NTFS is the default file system for modern Windows operating
systems, supporting permissions, encryption, and large volumes.
10. A user reports that their wireless connection drops frequently.
Which tool is BEST for diagnosing signal strength and interference?
A. Disk Management
B. Wi-Fi analyzer application
C. Task Manager
D. Registry Editor
Answer: B
Rationale: A Wi-Fi analyzer provides real-time information about signal
strength and channel interference, helping identify wireless connectivity
issues.
