CompTIA A+ Core 1 & Core 2 PRACTICE EXAM QUESTIONS
AND 100% VERIFIED ANSWERS PLUS RATIONALE.
1. Which of the following components is primarily responsible for executing instructions
in a computer system?
A. RAM
B. CPU
C. HDD
D. PSU
Correct Answer: B
Rationale: The CPU (Central Processing Unit) executes instructions. RAM stores
data temporarily, HDD stores data permanently, and PSU supplies power.
2. Which type of RAM is volatile and commonly used in modern computers?
A. ROM
B. DRAM
C. EEPROM
D. Flash
Correct Answer: B
Rationale: DRAM is volatile and used as system memory. ROM and EEPROM are
non-volatile, while flash is used in storage devices.
3. A technician needs to connect a monitor using a digital-only signal. Which port
should be used?
A. VGA
B. HDMI
C. DVI-A
D. Serial
Correct Answer: B
Rationale: HDMI carries digital signals. VGA and DVI-A are analog, and serial is
not used for video.
4. Which RAID level provides redundancy through mirroring?
A. RAID 0
B. RAID 1
C. RAID 5
D. RAID 10
Correct Answer: B
Rationale: RAID 1 mirrors data across drives. RAID 0 stripes without redundancy,
RAID 5 uses parity, and RAID 10 combines striping and mirroring.
,5. Which wireless standard operates exclusively on the 5 GHz band?
A. 802.11b
B. 802.11g
C. 802.11a
D. 802.11n
Correct Answer: C
Rationale: 802.11a uses only 5 GHz. Others operate on 2.4 GHz or both bands.
6. What is the default port number for HTTPS?
A. 80
B. 21
C. 443
D. 25
Correct Answer: C
Rationale: HTTPS uses port 443. Port 80 is HTTP, 21 is FTP, and 25 is SMTP.
7. A user reports slow performance. Which tool helps identify CPU bottlenecks in
Windows?
A. Device Manager
B. Task Manager
C. Disk Cleanup
D. Event Viewer
Correct Answer: B
Rationale: Task Manager shows CPU usage in real time. Other tools do not directly
monitor CPU performance.
8. Which connector is used for Ethernet networking?
A. RJ11
B. RJ45
C. USB
D. HDMI
Correct Answer: B
Rationale: RJ45 is used for Ethernet. RJ11 is for telephone lines.
9. What type of malware disguises itself as legitimate software?
A. Worm
B. Trojan
C. Spyware
D. Ransomware
Correct Answer: B
Rationale: Trojans appear legitimate but are malicious. Worms spread automatically,
spyware collects data, ransomware locks systems.
,10. Which command is used to test network connectivity?
A. ipconfig
B. ping
C. netstat
D. tracert
Correct Answer: B
Rationale: Ping checks connectivity by sending ICMP packets. Others serve different
networking functions.
11. Which device assigns IP addresses automatically on a network?
A. Switch
B. Router
C. DHCP Server
D. Firewall
Correct Answer: C
Rationale: DHCP servers assign IP addresses dynamically. Routers may include
DHCP but the function is specific.
12. What is the main purpose of a firewall?
A. Increase speed
B. Monitor temperature
C. Block unauthorized access
D. Store data
Correct Answer: C
Rationale: Firewalls control incoming/outgoing traffic to prevent unauthorized
access.
13. Which storage type has no moving parts?
A. HDD
B. SSD
C. Optical Drive
D. Tape Drive
Correct Answer: B
Rationale: SSDs use flash memory and have no moving parts, unlike HDDs.
14. Which Windows tool is used to manage disk partitions?
A. Disk Cleanup
B. Disk Management
C. Task Scheduler
D. Control Panel
, Correct Answer: B
Rationale: Disk Management handles partitions. Disk Cleanup removes temporary
files.
15. Which protocol is used for secure remote login?
A. Telnet
B. FTP
C. SSH
D. SNMP
Correct Answer: C
Rationale: SSH encrypts remote sessions. Telnet is unsecure.
16. What is the maximum length of a CAT5e cable?
A. 10 meters
B. 50 meters
C. 100 meters
D. 200 meters
Correct Answer: C
Rationale: Ethernet standards limit cable length to 100 meters for optimal
performance.
17. Which file system is used by default in modern Windows OS?
A. FAT32
B. exFAT
C. NTFS
D. EXT4
Correct Answer: C
Rationale: NTFS supports security and large files. EXT4 is used in Linux.
18. A technician needs to remove dust from internal components. What should be used?
A. Water
B. Compressed air
C. Vacuum cleaner
D. Cloth
Correct Answer: B
Rationale: Compressed air safely removes dust without damaging components.
19. Which mobile OS is developed by Apple?
A. Android
B. Windows Mobile
AND 100% VERIFIED ANSWERS PLUS RATIONALE.
1. Which of the following components is primarily responsible for executing instructions
in a computer system?
A. RAM
B. CPU
C. HDD
D. PSU
Correct Answer: B
Rationale: The CPU (Central Processing Unit) executes instructions. RAM stores
data temporarily, HDD stores data permanently, and PSU supplies power.
2. Which type of RAM is volatile and commonly used in modern computers?
A. ROM
B. DRAM
C. EEPROM
D. Flash
Correct Answer: B
Rationale: DRAM is volatile and used as system memory. ROM and EEPROM are
non-volatile, while flash is used in storage devices.
3. A technician needs to connect a monitor using a digital-only signal. Which port
should be used?
A. VGA
B. HDMI
C. DVI-A
D. Serial
Correct Answer: B
Rationale: HDMI carries digital signals. VGA and DVI-A are analog, and serial is
not used for video.
4. Which RAID level provides redundancy through mirroring?
A. RAID 0
B. RAID 1
C. RAID 5
D. RAID 10
Correct Answer: B
Rationale: RAID 1 mirrors data across drives. RAID 0 stripes without redundancy,
RAID 5 uses parity, and RAID 10 combines striping and mirroring.
,5. Which wireless standard operates exclusively on the 5 GHz band?
A. 802.11b
B. 802.11g
C. 802.11a
D. 802.11n
Correct Answer: C
Rationale: 802.11a uses only 5 GHz. Others operate on 2.4 GHz or both bands.
6. What is the default port number for HTTPS?
A. 80
B. 21
C. 443
D. 25
Correct Answer: C
Rationale: HTTPS uses port 443. Port 80 is HTTP, 21 is FTP, and 25 is SMTP.
7. A user reports slow performance. Which tool helps identify CPU bottlenecks in
Windows?
A. Device Manager
B. Task Manager
C. Disk Cleanup
D. Event Viewer
Correct Answer: B
Rationale: Task Manager shows CPU usage in real time. Other tools do not directly
monitor CPU performance.
8. Which connector is used for Ethernet networking?
A. RJ11
B. RJ45
C. USB
D. HDMI
Correct Answer: B
Rationale: RJ45 is used for Ethernet. RJ11 is for telephone lines.
9. What type of malware disguises itself as legitimate software?
A. Worm
B. Trojan
C. Spyware
D. Ransomware
Correct Answer: B
Rationale: Trojans appear legitimate but are malicious. Worms spread automatically,
spyware collects data, ransomware locks systems.
,10. Which command is used to test network connectivity?
A. ipconfig
B. ping
C. netstat
D. tracert
Correct Answer: B
Rationale: Ping checks connectivity by sending ICMP packets. Others serve different
networking functions.
11. Which device assigns IP addresses automatically on a network?
A. Switch
B. Router
C. DHCP Server
D. Firewall
Correct Answer: C
Rationale: DHCP servers assign IP addresses dynamically. Routers may include
DHCP but the function is specific.
12. What is the main purpose of a firewall?
A. Increase speed
B. Monitor temperature
C. Block unauthorized access
D. Store data
Correct Answer: C
Rationale: Firewalls control incoming/outgoing traffic to prevent unauthorized
access.
13. Which storage type has no moving parts?
A. HDD
B. SSD
C. Optical Drive
D. Tape Drive
Correct Answer: B
Rationale: SSDs use flash memory and have no moving parts, unlike HDDs.
14. Which Windows tool is used to manage disk partitions?
A. Disk Cleanup
B. Disk Management
C. Task Scheduler
D. Control Panel
, Correct Answer: B
Rationale: Disk Management handles partitions. Disk Cleanup removes temporary
files.
15. Which protocol is used for secure remote login?
A. Telnet
B. FTP
C. SSH
D. SNMP
Correct Answer: C
Rationale: SSH encrypts remote sessions. Telnet is unsecure.
16. What is the maximum length of a CAT5e cable?
A. 10 meters
B. 50 meters
C. 100 meters
D. 200 meters
Correct Answer: C
Rationale: Ethernet standards limit cable length to 100 meters for optimal
performance.
17. Which file system is used by default in modern Windows OS?
A. FAT32
B. exFAT
C. NTFS
D. EXT4
Correct Answer: C
Rationale: NTFS supports security and large files. EXT4 is used in Linux.
18. A technician needs to remove dust from internal components. What should be used?
A. Water
B. Compressed air
C. Vacuum cleaner
D. Cloth
Correct Answer: B
Rationale: Compressed air safely removes dust without damaging components.
19. Which mobile OS is developed by Apple?
A. Android
B. Windows Mobile
