Professional certification computer
technology Practice Exam
Question 1. Which component on a motherboard determines the type of CPU socket that can
be used?
A) Northbridge
B) Southbridge
C) Chipset
D) Power connector
Answer: C
Explanation: The chipset defines the CPU socket type and supported processors, while the
northbridge/southbridge handle memory and I/O functions.
Question 2. What is the primary advantage of DDR5 over DDR4 memory?
A) Lower latency
B) Higher clock speeds and bandwidth
C) Compatibility with older motherboards
D) Reduced voltage only
Answer: B
Explanation: DDR5 offers significantly higher data rates and bandwidth, enabling faster
performance compared with DDR4.
Question 3. Which interface provides the fastest sequential read/write speeds for consumer
SSDs?
A) SATA III
B) mSATA
C) NVMe over PCIe 4.0
D) USB 3.0
Answer: C
, Professional certification computer
technology Practice Exam
Explanation: NVMe SSDs using PCIe 4.0 deliver the highest sequential throughput among
consumer storage interfaces.
Question 4. In a RAID 5 configuration, how many drives can fail without data loss?
A) Zero
B) One
C) Two
D) All but one
Answer: B
Explanation: RAID 5 uses distributed parity, allowing a single drive failure while preserving data
integrity.
Question 5. Which power supply rating indicates 80% efficiency at 20%, 50%, and 100% load?
A) 80 PLUS Bronze
B) 80 PLUS Silver
C) 80 PLUS Gold
D) 80 PLUS Platinum
Answer: C
Explanation: 80 PLUS Gold certification requires at least 87% efficiency at 20% load, 90% at 50%,
and 87% at 100% load.
Question 6. When installing a dedicated graphics card, which BIOS setting is most likely to need
adjustment?
A) CSM (Compatibility Support Module)
B) Secure Boot
C) Primary display adapter to PCIe
, Professional certification computer
technology Practice Exam
D) SATA mode to AHCI
Answer: C
Explanation: Setting the primary display adapter to PCIe ensures the system uses the new
graphics card instead of integrated graphics.
Question 7. Which of the following is a characteristic of an OLED display?
A) Backlight required for illumination
B) Pixel-level illumination with true blacks
C) Limited viewing angles
D) High power consumption for static images
Answer: B
Explanation: OLED pixels emit their own light, allowing true black levels and wide viewing
angles.
Question 8. A laser printer is producing faint copies. Which component is most likely the cause?
A) Toner cartridge depleted
B) Fuser unit overheating
C) Drum unit worn out
D) Transfer roller misaligned
Answer: C
Explanation: A worn drum unit can cause reduced toner transfer, resulting in faint prints.
Question 9. Which laptop component is responsible for converting DC battery voltage to the
higher voltage needed by the LCD backlight?
A) Inverter
B) Power management IC
, Professional certification computer
technology Practice Exam
C) DC‑DC converter
D) Flex cable
Answer: A
Explanation: The inverter steps up the battery voltage to drive the LCD’s backlight (often CCFL or
LED).
Question 10. Which type of cable is most appropriate for a 10 Gbps Ethernet link over a distance
of 30 meters?
A) Cat5e
B) Cat6
C) Cat6a
D) RG‑6 coaxial
Answer: C
Explanation: Cat6a supports 10 Gbps up to 100 meters, whereas Cat6 is limited to 55 meters for
that speed.
Question 11. Which OSI layer is responsible for end‑to‑end reliability and flow control?
A) Physical
B) Data Link
C) Transport
D) Session
Answer: C
Explanation: The Transport layer (TCP) provides reliability, sequencing, and flow control
between endpoints.
Question 12. What is the default subnet mask for a Class C IPv4 network?
technology Practice Exam
Question 1. Which component on a motherboard determines the type of CPU socket that can
be used?
A) Northbridge
B) Southbridge
C) Chipset
D) Power connector
Answer: C
Explanation: The chipset defines the CPU socket type and supported processors, while the
northbridge/southbridge handle memory and I/O functions.
Question 2. What is the primary advantage of DDR5 over DDR4 memory?
A) Lower latency
B) Higher clock speeds and bandwidth
C) Compatibility with older motherboards
D) Reduced voltage only
Answer: B
Explanation: DDR5 offers significantly higher data rates and bandwidth, enabling faster
performance compared with DDR4.
Question 3. Which interface provides the fastest sequential read/write speeds for consumer
SSDs?
A) SATA III
B) mSATA
C) NVMe over PCIe 4.0
D) USB 3.0
Answer: C
, Professional certification computer
technology Practice Exam
Explanation: NVMe SSDs using PCIe 4.0 deliver the highest sequential throughput among
consumer storage interfaces.
Question 4. In a RAID 5 configuration, how many drives can fail without data loss?
A) Zero
B) One
C) Two
D) All but one
Answer: B
Explanation: RAID 5 uses distributed parity, allowing a single drive failure while preserving data
integrity.
Question 5. Which power supply rating indicates 80% efficiency at 20%, 50%, and 100% load?
A) 80 PLUS Bronze
B) 80 PLUS Silver
C) 80 PLUS Gold
D) 80 PLUS Platinum
Answer: C
Explanation: 80 PLUS Gold certification requires at least 87% efficiency at 20% load, 90% at 50%,
and 87% at 100% load.
Question 6. When installing a dedicated graphics card, which BIOS setting is most likely to need
adjustment?
A) CSM (Compatibility Support Module)
B) Secure Boot
C) Primary display adapter to PCIe
, Professional certification computer
technology Practice Exam
D) SATA mode to AHCI
Answer: C
Explanation: Setting the primary display adapter to PCIe ensures the system uses the new
graphics card instead of integrated graphics.
Question 7. Which of the following is a characteristic of an OLED display?
A) Backlight required for illumination
B) Pixel-level illumination with true blacks
C) Limited viewing angles
D) High power consumption for static images
Answer: B
Explanation: OLED pixels emit their own light, allowing true black levels and wide viewing
angles.
Question 8. A laser printer is producing faint copies. Which component is most likely the cause?
A) Toner cartridge depleted
B) Fuser unit overheating
C) Drum unit worn out
D) Transfer roller misaligned
Answer: C
Explanation: A worn drum unit can cause reduced toner transfer, resulting in faint prints.
Question 9. Which laptop component is responsible for converting DC battery voltage to the
higher voltage needed by the LCD backlight?
A) Inverter
B) Power management IC
, Professional certification computer
technology Practice Exam
C) DC‑DC converter
D) Flex cable
Answer: A
Explanation: The inverter steps up the battery voltage to drive the LCD’s backlight (often CCFL or
LED).
Question 10. Which type of cable is most appropriate for a 10 Gbps Ethernet link over a distance
of 30 meters?
A) Cat5e
B) Cat6
C) Cat6a
D) RG‑6 coaxial
Answer: C
Explanation: Cat6a supports 10 Gbps up to 100 meters, whereas Cat6 is limited to 55 meters for
that speed.
Question 11. Which OSI layer is responsible for end‑to‑end reliability and flow control?
A) Physical
B) Data Link
C) Transport
D) Session
Answer: C
Explanation: The Transport layer (TCP) provides reliability, sequencing, and flow control
between endpoints.
Question 12. What is the default subnet mask for a Class C IPv4 network?
