CompTIA A+ Core 1 practice quiz

Question 1

A smartphone charges slowly and drains quickly. What should the technician check first?

Accepted Answer

Charging cable and port

Answer

Replace the battery

Answer

Install an OS update

Answer

Factory reset device

Question 2

Which mobile component enables contactless payment at retail terminals?

Accepted Answer

Near Field Communication

Answer

Infrared port

Answer

Bluetooth Low Energy

Answer

Miracast mirroring

Question 3

Which mobile display technology offers the deepest black levels and saves power when showing dark content?

Accepted Answer

OLED

Answer

IPS LCD

Answer

VA LCD

Answer

CCFL LCD

Question 4

Which port does HTTPS use by default?

Accepted Answer

Port 443

Answer

Port 8080

Answer

Port 80

Answer

Port 21

Question 5

A workstation shows an APIPA address. What does this indicate?

Accepted Answer

DHCP server is not responding

Answer

Default gateway is set incorrectly on the PC

Answer

DNS server is unreachable from the workstation

Answer

Static IP was entered with the wrong mask

Question 6

`nslookup www.example.com` returns no response. What is the most likely issue?

Accepted Answer

DNS unreachable

Answer

Gateway wrong

Answer

Switch port disabled

Answer

SSL expired

Question 7

Which wireless standard is 5 GHz only with channels up to 160 MHz wide?

Accepted Answer

802.11ac

Answer

802.11g

Answer

802.11n

Answer

802.11b

Question 8

A user upgrades RAM from DDR4-2400 to DDR4-3200. What must they verify first?

Accepted Answer

Motherboard supports speed

Answer

RAM has a heat spreader fitted to the module

Answer

PSU is 80 Plus

Answer

RAM color matches

Question 9

Which RAID level mirrors data across two drives for real-time redundancy?

Accepted Answer

RAID 1

Answer

RAID 10

Answer

RAID 5

Answer

RAID 0

Question 10

What is the primary benefit of ECC memory over non-ECC?

Accepted Answer

Error detection

Answer

Higher density

Answer

Lower power

Answer

Faster clocks

Question 11

Which hypervisor type runs directly on hardware without a host OS?

Accepted Answer

Type 1 bare-metal

Answer

Container runtime

Answer

Type 2 hosted

Answer

App sandbox

Question 12

A cloud provider manages the OS and runtime while the developer controls the app and data. Which model?

Accepted Answer

PaaS

Answer

SaaS

Answer

DaaS

Answer

IaaS

Question 13

Which feature captures a VM's point-in-time state for later rollback?

Accepted Answer

Snapshot

Answer

Load balancing

Answer

Resource pooling

Answer

Cloning

Question 14

A PC powers on with repeated long beeps before POST. What does this indicate?

Accepted Answer

RAM error

Answer

Keyboard failure

Answer

Drive failure

Answer

Audio issue

Question 15

A laptop has intermittent blue screens and faulty RAM is suspected. Which tool runs first?

Accepted Answer

Memory Diagnostic

Answer

Device Manager

Answer

Event Viewer

Answer

Disk Management

Question 16

`ipconfig` shows 169.254.x.x and renewing fails. What is the next step?

Accepted Answer

Check DHCP server

Answer

Change browser

Answer

Reinstall Windows

Answer

Replace NIC

Question 17

Which protocol provides encrypted file transfer over port 22?

Accepted Answer

SFTP

Answer

HTTP

Answer

FTP

Answer

TFTP

Question 18

A user wants to add a second monitor to a laptop with only a USB-C port. Which adapter is needed?

Accepted Answer

USB-C to DisplayPort

Answer

PS/2 to VGA

Answer

DVI to HDMI

Answer

USB-A to HDMI

Question 19

Which RAID level stripes data across three or more drives with distributed parity?

Accepted Answer

RAID 5

Answer

RAID 0

Answer

RAID 1

Answer

RAID 6

Question 20

Which type of printer uses a fuser to melt toner onto paper?

Accepted Answer

Laser

Answer

Inkjet

Answer

Thermal

Answer

Dot matrix

Question 21

Which hypervisor type requires a host operating system to run?

Accepted Answer

Type 2

Answer

Type 1

Answer

Hardware-assisted

Answer

Bare-metal

Question 22

Which cloud deployment model combines on-premises infrastructure with public cloud services?

Accepted Answer

Hybrid cloud

Answer

Public cloud

Answer

Community cloud

Answer

Private cloud

Question 23

A user reports an intermittent network connection. The cable passed a cable test, and a loopback plug shows the NIC port is good. Which tool should the technician use next?

Accepted Answer

Protocol analyzer

Answer

Multimeter

Answer

Cable tester

Answer

Loopback plug

Question 24

A 2.4 GHz wireless network shows a strong signal but very slow speeds. What is the most likely cause?

Accepted Answer

Microwave oven

Answer

Wrong SSID

Answer

VPN encryption

Answer

Distance from AP

Question 25

Which wireless standard added support for the 6 GHz frequency band?

Accepted Answer

Wi-Fi 6E

Answer

Wi-Fi 5

Answer

Wi-Fi 4

Answer

Wi-Fi 6

Question 26

Which RAID level combines mirroring and striping for both performance and fault tolerance?

Accepted Answer

RAID 10

Answer

RAID 5

Answer

RAID 1

Answer

RAID 0

Question 27

A laptop battery shows 100% charge but the system dies when unplugged. What is the most likely issue?

Accepted Answer

Battery cell failure

Answer

BIOS power setting

Answer

Corrupted power driver

Answer

Faulty AC adapter

Question 28

A PC displays a blue screen with error code IRQL_NOT_LESS_OR_EQUAL. What should the technician check first?

Accepted Answer

Recently installed drivers

Answer

Monitor cable connection

Answer

Hard drive health

Answer

Power supply voltage

Question 29

A company needs to translate private internal addresses to public addresses for internet access. Which technology is used?

Accepted Answer

Network Address Translation

Answer

Quality of Service

Answer

DNS forwarding

Answer

Spanning Tree Protocol

Question 30

Which port number is used by SSH for secure remote command-line access?

Accepted Answer

22

Answer

3389

Answer

23

Answer

445

Question 31

A technician runs ipconfig and sees a valid IP but the default gateway is 0.0.0.0. What does this indicate?

Accepted Answer

No default gateway is configured

Answer

The NIC is disabled

Answer

DNS resolution is working

Answer

The DHCP server is down

Question 32

Which printer technology uses a heated printhead to darken special heat-sensitive paper?

Accepted Answer

Direct thermal printing

Answer

Inkjet printing

Answer

Laser printing

Answer

Dye sublimation

Question 33

A technician needs to lock a lost corporate phone remotely. Which MDM action is appropriate?

Accepted Answer

Send a remote lock command from the MDM console

Answer

Disable the company Wi-Fi network

Answer

Send a text message to the finder

Answer

Factory reset the device immediately

Question 34

A technician runs ipconfig and sees a subnet mask of 255.255.255.0. How many usable host addresses does this provide?

Accepted Answer

254

Answer

512

Answer

256

Answer

128

Question 35

A technician needs to trace a cable through a wall without running alongside it. Which tool identifies the cable?

Accepted Answer

Tone generator and probe

Answer

Loopback plug

Answer

Multimeter

Answer

Cable tester that checks the continuity of the pairs

Question 36

A laptop uses a 2.5-inch SATA SSD. The user wants better performance. Which upgrade provides the biggest speed increase?

Accepted Answer

Replace with an M.2 NVMe SSD

Answer

Install a faster CPU

Answer

Add more RAM

Answer

Upgrade to a larger SATA SSD

Question 37

A shipping office must print three-part carbonless invoice forms in a single pass. Which printer type should it buy?

Accepted Answer

Impact printer

Answer

Laser printer

Answer

Inkjet printer

Answer

Direct thermal printer

Question 38

A technician needs to verify that a newly installed Cat6 cable is wired to the T568B standard at both ends. Which tool should be used?

Accepted Answer

Cable tester that checks pin-to-pin continuity and pair mapping

Answer

Packet sniffer that analyzes traffic flowing through the cable

Answer

Multimeter set to continuity mode across the RJ45 connector pins

Answer

Tone generator and probe to trace the cable through walls

Question 39

A technician replaces a CPU cooler on a high-performance workstation. After reassembly the CPU overheats within minutes. The cooler fan is spinning. What should the technician check first?

Accepted Answer

Whether thermal paste was applied between the CPU and cooler before mounting

Answer

Whether the case fans are connected to the correct motherboard headers

Answer

If the power supply is providing adequate wattage to the cooling system

Answer

If the BIOS fan curve is set to a quiet profile that limits the speeds

Question 40

A desktop powers on but the screen remains blank with no error beeps. The DRAM status LED on the motherboard stays lit. What should the technician check first?

Accepted Answer

Reseat the RAM modules and verify they are fully locked in the DIMM slots

Answer

Disconnect all USB devices to rule out peripheral interference during startup

Answer

Reinstall the operating system from recovery media to fix boot sector corruption

Answer

Replace the power supply with a higher wattage unit to improve POST output