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CompTIA A+ Core 1 2023 past questions and answers

This 2023 CompTIA A+ Core 1 set has 19 practice questions. Try these 5 free sample questions, tap a question to reveal the answer and explanation. Then practise the whole 2023 set with instant marking.

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Sample CompTIA A+ Core 1 2023 questions

1. A laptop's removable battery case is visibly swollen and no longer fits flush. What should the technician do first?
  1. Press the case flat and continue using the laptop
  2. Puncture the battery outdoors to release the gas
  3. Charge the battery fully before removing it
  4. Stop using the laptop, disconnect power, and arrange safe battery service

Answer: D. Stop using the laptop, disconnect power, and arrange safe battery service

A swollen lithium-ion battery is a safety hazard; stop use, disconnect external power, and handle it according to the manufacturer's service guidance. Pressing or puncturing it risks fire or injury.

2. A smartphone displays a normal image, but tapping anywhere on the screen produces no response. Which component is the most likely cause?
  1. Digitizer
  2. Backlight
  3. Proximity sensor
  4. Front-facing camera

Answer: A. Digitizer

The digitizer detects touch input, so its failure can leave the displayed image intact while touch stops working. A failed backlight would affect screen illumination, not touch detection.

3. An office is configuring three nearby 2.4 GHz Wi-Fi access points and wants a commonly used set of non-overlapping channels. Which set should it choose?
  1. 1, 6, and 11
  2. 2, 7, and 12
  3. 3, 6, and 9
  4. 4, 8, and 12

Answer: A. 1, 6, and 11

Channels 1, 6, and 11 are the standard non-overlapping 2.4 GHz channel set in regions using 11 channels. The other listed sets include channels that overlap.

4. Several devices on a small office LAN use private IPv4 addresses but share one public IPv4 address for outbound internet traffic. Which router function enables this?
  1. DNS
  2. DHCP
  3. NAT
  4. SNMP

Answer: C. NAT

Network Address Translation (NAT) translates private internal addresses to a public address for internet communication. DHCP assigns addresses, while DNS resolves names.

5. A technician needs to connect a desktop to a switch using a standard wired Ethernet link. Which cable should be used?
  1. RJ11 telephone cable
  2. Coaxial cable with F-type connectors
  3. Single-mode fiber with LC connectors
  4. Twisted-pair Ethernet cable with RJ45 connectors

Answer: D. Twisted-pair Ethernet cable with RJ45 connectors

A standard copper Ethernet connection between a desktop and switch uses twisted-pair Ethernet cable terminated with RJ45 connectors. RJ11 is used for telephone connections, and the other choices are different media/interfaces.

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