CompTIA A+ Core 1 Practice Questions: Hardware

105 free, exam-style CompTIA A+ Core 1 (220-1101) practice questions covering Hardware. Each question shows the correct answer and a clear explanation. Ready for the real thing? Take the full timed quiz below.

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Q1. Which of the following is a characteristic of DDR4 RAM compared to DDR3?

Explanation: DDR4 RAM offers significantly higher data transfer rates compared to DDR3, making it faster and more efficient for modern computing tasks. Additionally, DDR4 operates at lower voltages (1.2V) compared to DDR3 (1.5V), which helps reduce power consumption and heat generation. Learn more.

Q2. What is the maximum data transfer speed of USB 3.2 Gen 2×2?

Explanation: USB 3.2 Gen 2×2 achieves a maximum data transfer speed of 20 Gbps by utilizing two 10 Gbps lanes. This makes it ideal for high-speed data transfer applications, such as external SSDs and high-resolution video streaming. Learn more.

Q3. Which component is responsible for storing the BIOS settings?

Explanation: The CMOS battery maintains BIOS settings when the computer is powered off. Learn more.

Q4. What type of connector is used for SATA data cables?

Explanation: SATA data cables use a 7-pin L-shaped connector. Learn more.

Q5. What is the primary purpose of a UPS?

Explanation: A UPS (Uninterruptible Power Supply) provides temporary backup power during outages. Learn more.

Q6. What does the acronym RAID stand for?

Explanation: RAID stands for Redundant Array of Independent Disks (originally Inexpensive Disks). Learn more.

Q7. Which component converts AC power to DC power in a computer?

Explanation: The power supply unit (PSU) converts AC from the wall outlet to DC used by computer components. Learn more.

Q8. What is the primary benefit of using SSDs over HDDs?

Explanation: SSDs offer significantly faster access times and data transfer speeds compared to HDDs. Learn more.

Q9. What is the purpose of the MBR on a hard drive?

Explanation: The Master Boot Record contains the partition table and initial boot loader code. Learn more.

Q10. What is the function of a heatsink?

Explanation: Heatsinks absorb and dissipate heat away from critical components like CPUs and GPUs. Learn more.

Q11. Which component determines the maximum amount of RAM a system can support?

Explanation: The motherboard's chipset and physical slots determine the maximum RAM capacity. Learn more.

Q12. Which type of printer uses toner?

Explanation: Laser printers use toner powder fused to paper with heat. Learn more.

Q13. Which RAID level provides mirroring without parity?

Explanation: RAID 1 provides disk mirroring, writing identical data to two disks for redundancy. Learn more.

Q14. Which component is responsible for processing graphics in a computer?

Explanation: The GPU (Graphics Processing Unit) handles graphics rendering and processing. Learn more.

Q15. What is the purpose of a thermal pad in a computer?

Explanation: Thermal pads improve heat conduction between components and heatsinks. Learn more.

Q16. Which component connects all hardware devices in a computer?

Explanation: The motherboard provides the physical and electrical connections between components. Learn more.

Q17. Which type of cable is used for analog video?

Explanation: VGA (Video Graphics Array) carries analog video signals. Learn more.

Q18. Which component is responsible for storing long-term data when power is off?

Explanation: SSDs and HDDs provide non-volatile storage that persists without power. Learn more.

Q19. What is the purpose of a surge protector?

Explanation: Surge protectors safeguard electronics from voltage spikes and power surges. Learn more.

Q20. Which component determines a CPU's processing speed?

Explanation: CPU performance depends on clock speed, cores, cache, and architecture. Learn more.

Q21. Which component is responsible for cooling a CPU?

Explanation: CPU coolers typically combine a heat sink and fan (or liquid cooling). Learn more.

Q22. Which component is responsible for power regulation in a computer?

Explanation: The power supply unit regulates and distributes power to all components. Learn more.

Q23. Which of the following is a common symptom of a failing hard drive?

Explanation: Clicking noises (the 'click of death') and slow performance are signs of a failing HDD. Learn more.

Q24. Which type of RAM is commonly used in laptops?

Explanation: SODIMM (Small Outline DIMM) is the compact RAM form factor used in laptops. Learn more.

Q25. Which of the following is a characteristic of an SSD compared to an HDD?

Explanation: SSDs have no moving parts, making them faster and more durable than HDDs. Learn more.

Q26. What is the purpose of a UPS (Uninterruptible Power Supply)?

Explanation: A UPS provides short-term power during outages, allowing safe shutdowns. Learn more.

Q27. Which of the following is a common symptom of overheating?

Explanation: Overheating can cause sudden shutdowns to prevent hardware damage. Learn more.

Q28. Which of the following is a common symptom of a failing power supply?

Explanation: A failing PSU may cause no power, random restarts, or instability. Learn more.

Q29. Which of the following is a common symptom of a failing GPU?

Explanation: A failing GPU may display visual artifacts, crashes, or no output. Learn more.

Q30. Which of the following is a common symptom of a failing motherboard?

Explanation: A failing motherboard may prevent the system from powering on or POSTing. Learn more.

Q31. Which of the following is a common symptom of a failing CPU?

Explanation: A failing CPU may cause crashes, overheating, or failure to boot. Learn more.

Q32. Which of the following is a common symptom of a failing RAM module?

Explanation: Failing RAM often causes BSODs, crashes, or memory-related errors. Learn more.

Q33. Which of the following is a common symptom of a failing network card?

Explanation: A failing NIC may cause no connection, slow speeds, or intermittent drops. Learn more.

Q34. Which of the following is a common symptom of a failing SSD?

Explanation: A failing SSD may cause file corruption, slow speeds, or failure to boot. Learn more.

Q35. Which of the following is a common symptom of a failing cooling fan?

Explanation: A failing fan can cause overheating, thermal throttling, or shutdowns. Learn more.

Q36. Which of the following is a common symptom of a failing keyboard?

Explanation: A failing keyboard may have stuck, unresponsive, or ghosting keys. Learn more.

Q37. Which of the following is a common symptom of a failing mouse?

Explanation: A failing mouse may have unresponsive movement or button issues. Learn more.

Q38. Which of the following is a common symptom of a failing monitor?

Explanation: A failing monitor may show no image, flickering, or color distortion. Learn more.

Q39. Which of the following is a common symptom of a failing speaker?

Explanation: Failing speakers may produce no sound, static, or crackling noises. Learn more.

Q40. Which of the following is a common symptom of a failing webcam?

Explanation: A failing webcam may show no video, poor quality, or freezing. Learn more.

Q41. Which of the following is a common symptom of a failing microphone?

Explanation: A failing microphone may produce no sound or distorted audio. Learn more.

Q42. Which of the following is a common symptom of a failing touchpad?

Explanation: A failing touchpad may have unresponsive or erratic cursor movement. Learn more.

Q43. Which of the following is a common symptom of a failing optical drive?

Explanation: A failing optical drive may not read or write discs properly. Learn more.

Q44. Which of the following is a common symptom of a failing USB port?

Explanation: A failing USB port may not detect connected devices or provide power. Learn more.

Q45. Which of the following is a common symptom of a failing battery in a laptop?

Explanation: A failing battery may drain quickly or not hold a charge. Learn more.

Q46. Which of the following is a common symptom of a failing power button?

Explanation: A failing power button may not respond when pressed. Learn more.

Q47. Which of the following is a common symptom of a failing CMOS battery?

Explanation: A failing CMOS battery may cause BIOS settings or system time to reset. Learn more.

Q48. Which of the following is a characteristic of NVMe SSDs?

Explanation: NVMe SSDs use PCIe lanes for much faster speeds than SATA SSDs. Learn more.

Q49. What is the purpose of RAID 5?

Explanation: RAID 5 stripes data across disks with parity for fault tolerance. Learn more.

Q50. Which of the following is a characteristic of ARM processors?

Explanation: ARM CPUs are power-efficient and used in smartphones/tablets. Learn more.

Q51. Which type of storage device uses flash memory and has no moving parts?

Explanation: SSDs (Solid State Drives) use flash memory to store data, resulting in faster read/write speeds, lower power consumption, and greater durability compared to traditional HDDs with spinning platters. They're ideal for modern laptops and systems requiring quick boot and load times. Learn more.

Q52. What is the primary purpose of a thermal paste in a computer?

Explanation: Thermal paste improves heat transfer between the CPU and the heatsink, ensuring efficient cooling. Learn more.

Q53. Which type of printer uses a ribbon to transfer ink onto paper?

Explanation: Dot Matrix printers use a ribbon and a print head that strikes the ribbon against the paper to form characters or images. They're impact printers, suitable for printing multipart forms or carbon copies, often found in industrial and financial environments. Learn more.

Q54. Which RAID level provides striping with parity for fault tolerance?

Explanation: RAID 5 stripes data across three or more drives and includes distributed parity for fault tolerance. If one drive fails, the data can be rebuilt from the parity information, offering a good balance between performance, storage efficiency, and redundancy. Learn more.

Q55. Which type of memory is used for cache in modern CPUs?

Explanation: SRAM (Static RAM) is used for CPU cache because it is much faster than DRAM and doesn't need to be refreshed. It stores frequently accessed data to speed up CPU operations, though it is more expensive and consumes more space than DRAM. Learn more.

Q56. What is the primary purpose of a KVM switch?

Explanation: A KVM (Keyboard, Video, Mouse) switch allows a user to control multiple computers from a single keyboard, monitor, and mouse setup. It's commonly used in data centers and labs to manage several systems efficiently without duplicating peripherals. Learn more.

Q57. Which of the following is a characteristic of DDR4 RAM compared to DDR3?

Explanation: DDR4 RAM supports greater capacity (density) and higher data transfer speeds than DDR3 while using less voltage (typically 1.2V compared to DDR3's 1.5V). This makes DDR4 more power-efficient and better suited for modern computing tasks. Learn more.

Q58. What is the maximum data transfer speed of USB 3.2 Gen 2×2?

Explanation: USB 3.2 Gen 2×2 supports 20 Gbps by using two lanes of 10 Gbps. Learn more.

Q59. Which component is responsible for storing the BIOS settings?

Explanation: The CMOS battery powers a small amount of non-volatile memory on the motherboard that stores BIOS configuration settings like system time, boot order, and hardware settings. If the battery fails, settings may reset to default each time the computer is powered off. Learn more.

Q60. What type of connector is used for SATA data cables?

Explanation: SATA data cables use a 7-pin L-shaped connector. Learn more.

Q61. What is the primary purpose of a UPS?

Explanation: UPS (Uninterruptible Power Supply) provides temporary battery power during blackouts. Learn more.

Q62. Which motherboard form factor is commonly found in small, compact desktop systems and HTPCs, offering a balance between size and expansion capabilities?

Explanation: Micro-ATX is smaller than ATX but larger than Mini-ITX, providing a good compromise with more expansion slots than Mini-ITX, making it suitable for compact desktops that still need some upgradeability. Learn more.

Q63. A technician needs to install a new PCIe x16 graphics card. Which of the following power connectors is MOST likely required directly from the PSU for this card?

Explanation: Modern dedicated graphics cards, especially mid-range to high-end ones, often require additional power directly from the PSU via a 6-pin or 8-pin (often a 6+2 pin) PCIe power connector. Learn more.

Q64. Which of the following CPU socket types uses pins on the motherboard that make contact with flat pads on the CPU?

Explanation: LGA (Land Grid Array) sockets have pins on the motherboard, and the CPU has flat conductive lands (pads). PGA sockets have pins on the CPU that insert into holes on the motherboard. BGA is typically soldered. Learn more.

Q65. A technician needs to connect a digital display that supports both audio and video over a single cable, but HDMI is not available. Which of the following interfaces would be the BEST alternative?

Explanation: DisplayPort is a digital display interface that supports high resolutions, high refresh rates, and can carry audio signals, similar to HDMI. DVI-D is digital video only, and VGA is analog. Learn more.

Q66. Which motherboard form factor is most commonly used in full-tower desktop PCs?

Explanation: Standard ATX motherboards fit in full-tower cases and offer the most expansion slots.

Q67. Which connector supplies 12 V and 5 V to the motherboard from the power supply?

Explanation: The 24-pin ATX connector provides motherboard power rails including 12 V and 5 V.

Q68. Which storage interface has the lowest latency and highest throughput for SSDs?

Explanation: NVMe SSDs on PCIe have much lower latency and higher throughput than SATA or SAS SSDs.

Q69. Which type of memory module is used in laptops?

Explanation: SODIMM (Small Outline DIMM) modules are the compact format used in laptops.

Q70. Which type of connector is typically used for connecting an analog telephone line to a modem or wall jack?

Explanation: RJ11 connectors are smaller, typically 4-pin connectors used for telephone lines, while RJ45 connectors are larger 8-pin connectors used for Ethernet networking. Learn more.

Q71. Which Ethernet cable category offers higher bandwidth and improved crosstalk performance compared to Cat 5e, supporting 1 Gbps over 100 meters and 10 Gbps over shorter distances?

Explanation: Cat 6 Ethernet cable provides higher performance than Cat 5e, supporting Gigabit Ethernet up to 100 meters and 10 Gigabit Ethernet up to 55 meters due to tighter twisting and often a central spline to reduce crosstalk. Learn more.

Q72. What is the fastest common rotational speed (RPM) for traditional mechanical hard disk drives (HDDs) typically found in high-performance workstations or servers?

Explanation: 15,000 RPM (revolutions per minute) is the fastest common rotational speed for HDDs, typically found in high-performance enterprise or server environments, offering better access times than slower drives but still significantly slower than SSDs. Learn more.

Q73. Which type of RAM includes special circuitry to detect and correct common memory errors, making it essential for critical applications and servers?

Explanation: ECC (Error-Correcting Code) RAM uses an extra chip to store parity bits and can detect and correct single-bit memory errors, which is crucial for server stability and data integrity. Learn more.

Q74. Which CPU architecture, based on the Complex Instruction Set Computer (CISC) design, is primarily used in most traditional desktop and server computers?

Explanation: x64 (also known as AMD64 or Intel 64) is the 64-bit extension of the x86 instruction set architecture, which has dominated desktop and server computing for decades due to its backward compatibility and performance. Learn more.

Q75. Which BIOS/UEFI security feature stores cryptographic keys and provides a hardware-based root of trust for secure boot and disk encryption?

Explanation: TPM (Trusted Platform Module) is a secure cryptoprocessor that stores cryptographic keys, passwords, and digital certificates. It is fundamental for implementing features like Secure Boot (to prevent malicious loaders) and BitLocker disk encryption. Learn more.

Q76. What is a significant advantage of using a modular power supply unit (PSU) in a computer build?

Explanation: A modular power supply allows the user to detach unused cables, significantly reducing cable clutter inside the computer case. This improves airflow, makes cable management easier, and results in a cleaner-looking build. Learn more.

Q77. Which type of connector is typically used for connecting an analog telephone line to a modem or wall jack?

Explanation: RJ11 connectors are smaller, typically 4-pin connectors used for telephone lines, while RJ45 connectors are larger 8-pin connectors used for Ethernet networking. Learn more.

Q78. Which Ethernet cable category offers higher bandwidth and improved crosstalk performance compared to Cat 5e, supporting 1 Gbps over 100 meters and 10 Gbps over shorter distances?

Explanation: Cat 6 Ethernet cable provides higher performance than Cat 5e, supporting Gigabit Ethernet up to 100 meters and 10 Gigabit Ethernet up to 55 meters due to tighter twisting and often a central spline to reduce crosstalk. Learn more.

Q79. What is the fastest common rotational speed (RPM) for traditional mechanical hard disk drives (HDDs) typically found in high-performance workstations or servers?

Explanation: 15,000 RPM (revolutions per minute) is the fastest common rotational speed for HDDs, typically found in high-performance enterprise or server environments, offering better access times than slower drives but still significantly slower than SSDs. Learn more.

Q80. Which type of RAM includes special circuitry to detect and correct common memory errors, making it essential for critical applications and servers?

Explanation: ECC (Error-Correcting Code) RAM uses an extra chip to store parity bits and can detect and correct single-bit memory errors, which is crucial for server stability and data integrity. Learn more.

Q81. Which CPU architecture, based on the Complex Instruction Set Computer (CISC) design, is primarily used in most traditional desktop and server computers?

Explanation: x64 (also known as AMD64 or Intel 64) is the 64-bit extension of the x86 instruction set architecture, which has dominated desktop and server computing for decades due to its backward compatibility and performance. Learn more.

Q82. Which BIOS/UEFI security feature stores cryptographic keys and provides a hardware-based root of trust for secure boot and disk encryption?

Explanation: TPM (Trusted Platform Module) is a secure cryptoprocessor that stores cryptographic keys, passwords, and digital certificates. It is fundamental for implementing features like Secure Boot (to prevent malicious loaders) and BitLocker disk encryption. Learn more.

Q83. What is a significant advantage of using a modular power supply unit (PSU) in a computer build?

Explanation: A modular power supply allows the user to detach unused cables, significantly reducing cable clutter inside the computer case. This improves airflow, makes cable management easier, and results in a cleaner-looking build. Learn more.

Q84. A technician is wiring an Ethernet cable to connect a computer to a switch. They should consistently use the same wiring standard (e.g., T568A or T568B) on both ends of the cable for a:

Explanation: For a straight-through Ethernet connection (used for connecting unlike devices, like a computer to a switch), the wiring standard (T568A or T568B) must be the same on both ends of the cable. A crossover connection requires different standards on each end. Learn more.

Q85. What is the primary benefit of using a triple-channel or quad-channel RAM configuration compared to single-channel or dual-channel setups?

Explanation: Triple-channel and quad-channel RAM configurations increase the memory bandwidth, allowing the CPU to access data from RAM much faster. This can lead to significant performance improvements in memory-intensive tasks. Learn more.

Q86. What is the typical physical form factor of a Solid State Drive (SSD) that connects directly to a small slot on a motherboard and uses the NVMe interface?

Explanation: M.2 is a popular form factor for NVMe SSDs, resembling a small stick of gum. It plugs directly into an M.2 slot on modern motherboards, offering very high speeds via the PCIe interface. Learn more.

Q87. Which motherboard component acts as the physical interface for installing the Central Processing Unit (CPU) and determines its compatible pin layout?

Explanation: The CPU socket is the physical connector on the motherboard where the CPU is installed. Different CPU sockets (e.g., LGA, PGA) are designed for specific CPU architectures and pin/land layouts. Learn more.

Q88. A new desktop PC has a 24-pin ATX motherboard power connector. If a new power supply is being installed, what is the minimum number of pins the new power supply's main motherboard connector should have to ensure compatibility?

Explanation: Modern motherboards typically use a 24-pin ATX power connector. While some older motherboards used 20 pins, a 24-pin connector on the PSU (often designed as 20+4 pins) ensures compatibility with both 20-pin and 24-pin motherboards by allowing the extra 4 pins to be attached or left disconnected. Learn more.

Q89. A multifunction printer in an office is used for scanning documents. Which component allows the printer to automatically scan multiple pages from a stack without manual feeding?

Explanation: The Automatic Document Feeder (ADF) is a feature found on many multifunction printers that allows a user to place a stack of documents, which the printer then automatically feeds one page at a time for scanning, copying, or faxing. Learn more.

Q90. In the laser printing process, what is the role of the fuser assembly?

Explanation: The fuser assembly is a critical component in laser printers. It consists of heated rollers that melt the toner particles onto the paper and pressure rollers that press the toner into the paper fibers, permanently bonding the image to the page. Learn more.

Q91. Which peripheral cable standard offers a reversible connector, very high bandwidth (up to 40 Gbps for its latest versions), and the ability to carry data, video (DisplayPort), and power over a single cable?

Explanation: Thunderbolt is a high-speed interface developed by Intel that uses the USB-C connector. It supports data transfer, video output (DisplayPort), and power delivery, making it extremely versatile. Objective 3.1 covers 'Peripheral cables' including 'Thunderbolt'. Learn more.

Q92. What is the primary benefit of installing RAM in a dual-channel configuration compared to a single-channel configuration, assuming compatible modules and motherboard support?

Explanation: Dual-channel memory configurations allow the memory controller to access two RAM modules simultaneously, effectively doubling the memory bandwidth and improving overall system performance, especially in memory-intensive tasks. Objective 3.2 covers 'Dual-channel' RAM. Learn more.

Q93. Which small form factor SSD uses the SATA interface and is commonly found in older ultrabooks, tablets, or as a cache drive in some hybrid systems?

Explanation: mSATA (mini-SATA) is a smaller form factor for SSDs that uses the SATA interface. It was popular in compact devices before the widespread adoption of M.2 SSDs. Objective 3.3 covers 'SSDs' and 'Form factors' including 'mSATA'. Learn more.

Q94. Which type of PCIe slot is typically used for high-performance graphics cards, providing the most lanes for data transfer and ensuring maximum bandwidth for demanding visual tasks?

Explanation: PCIe x16 slots provide 16 lanes of PCIe connectivity, offering the highest bandwidth for data transfer. They are the standard slot for dedicated graphics cards and other high-performance expansion cards. Objective 3.4 covers 'Motherboard connector types' including 'PCI Express (PCIe)'. Learn more.

Q95. Which power supply output voltage (measured in Volts DC) is primarily used to power high-end components like the CPU, GPUs, and motor-driven devices such as hard drives and optical drives?

Explanation: The 12V rail is crucial for powering the CPU, graphics card (GPU), and drive motors, as these components require significant power. The 3.3V and 5V rails power smaller components and logic circuits. Objective 3.5 covers 'Output 3.3V vs. 5V vs. 12V'. Learn more.

Q96. A user wants to print a document with complex graphics and precise layout, ensuring consistent output regardless of the printer model. Which printer driver language is generally preferred for its ability to handle such tasks accurately?

Explanation: PostScript is a page description language that allows for high-quality, scalable graphics and text, making it ideal for professional printing and ensuring consistent output across different PostScript-compatible printers. PCL is more common for general office printing. Objective 3.6 covers 'Drivers' including 'Printer Control Language (PCL) vs. PostScript'. Learn more.

Q97. Which type of printer consumable is known for being sensitive to heat and light, requiring careful handling and proper storage to prevent premature degradation of the paper and fading of printed images over time?

Explanation: Thermal paper is specially coated to react to heat from the printhead. This coating is sensitive to heat, light, and certain chemicals, which can cause the printed images to fade or the paper to degrade prematurely if not stored properly. Objective 3.7 covers 'Thermal' printers and 'Heat sensitivity of paper'. Learn more.

Q98. What is the primary function of the Fuser Assembly in a laser printer?

Explanation: The fuser assembly uses heat and pressure to melt the toner powder and permanently bond it to the paper fibers. If the fuser fails, toner may smudge easily. Learn more.

Q99. Which hardware component is most critical for a virtualization workstation intended to run multiple virtual machines simultaneously?

Explanation: Virtual machines share the host's system memory and CPU resources. Therefore, maximizing RAM and CPU cores is essential for performance. Learn more.

Q100. A projector image is dim even after cleaning the lens. What is the most likely maintenance item?

Explanation: Traditional projectors use lamps that dim over time and may need replacement according to usage hours. Learn more.

Q101. Which display connector can carry both digital video and audio and is common on modern PCs?

Explanation: DisplayPort is a digital display interface capable of carrying high-resolution video and audio. Learn more.

Q102. Which type of display connector is analog only?

Explanation: VGA carries analog video signals, unlike HDMI and DisplayPort. Learn more.

Q103. Which component converts AC wall power into DC voltages used by PC components?

Explanation: A PSU converts AC input into regulated DC outputs needed by the motherboard, drives, and peripherals. Learn more.

Q104. Which motherboard firmware setting commonly enables booting from a network imaging server?

Explanation: PXE boot allows a system to load a network boot program from an imaging or deployment server. Learn more.

Q105. Which type of memory error can be detected and corrected by compatible server RAM?

Explanation: ECC memory can detect and correct certain memory errors, commonly single-bit errors. Learn more.

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