Courseiva

CCNA CPU Questions

30 questions · CPU · All types, answers revealed

Practice these questionsDomain overviewAll questions
1
MCQeasy

A technician is building a new workstation for a graphic designer. The user needs fast single-threaded performance for Adobe Photoshop. Which CPU characteristic should the technician prioritize?

A.Maximum number of cores
B.Higher clock speed (GHz)
C.Larger L3 cache size
D.Lower TDP
AnswerB

Higher clock speed directly improves single-threaded performance, which is critical for Photoshop's processing.

Why this answer

For applications like Photoshop that rely heavily on single-threaded performance, higher clock speed is more important than core count. This question tests the understanding of CPU performance metrics for specific workloads.

Practice this question →
2
MCQmedium

A user reports that their computer intermittently freezes for a few seconds during normal use. The technician checks Event Viewer and finds 'WHEA-Logger' errors related to the CPU. What is the most likely cause?

A.Outdated graphics driver
B.CPU overheating
C.Unstable CPU overclock or insufficient voltage
D.Faulty hard drive
AnswerC

WHEA-Logger errors are a classic sign of an unstable overclock or voltage issue, causing transient errors.

Why this answer

WHEA-Logger errors often indicate hardware issues, particularly with the CPU or its voltage. This can stem from an unstable overclock or insufficient power delivery.

Practice this question →
3
MCQmedium

A technician is troubleshooting a workstation that fails to boot. The motherboard has a POST code display showing '00'. The CPU fan spins, but there is no display output. Which component is most likely faulty?

A.The power supply unit
B.The RAM modules
C.The CPU
D.The graphics card
AnswerC

POST code '00' is a common indicator of a CPU initialization failure, pointing to a faulty or improperly installed CPU.

Why this answer

POST code '00' typically indicates a CPU-related issue, such as a faulty CPU, incorrect installation, or bent pins. Since the fan spins, power is reaching the board, but the CPU is not initializing. The technician should reseat the CPU and check for damage.

Practice this question →
4
MCQmedium

A user complains that their computer is running slowly, especially when opening multiple browser tabs. Task Manager shows the CPU is at 100% usage constantly, even when idle. Which of the following is the most likely cause?

A.Insufficient RAM
B.CPU thermal throttling
C.Background malware or a driver issue
D.Failing hard drive
AnswerC

Malware or a faulty driver can run hidden processes that max out the CPU, causing constant high usage.

Why this answer

Constant 100% CPU usage at idle suggests a background process is consuming resources, often due to malware or a misbehaving driver. This tests the ability to distinguish between hardware and software issues.

Practice this question →
5
MCQeasy

A user complains that their PC is running slowly and the fan is constantly running at high speed. Task Manager shows the CPU is consistently at 100% usage even when idle. Which of the following is the most likely cause?

A.The CPU is overheating due to dried thermal paste
B.A background process is consuming CPU cycles, such as a mining script or system update
C.The power supply is failing and cannot provide enough power
D.The CPU has been overclocked beyond its limits
AnswerB

Malware or a stuck update can peg the CPU at 100% usage, causing high temperatures and constant fan operation.

Why this answer

High CPU usage at idle is often due to background processes, such as malware or a runaway application. The constant high fan speed indicates the CPU is generating excess heat from this activity.

Practice this question →
6
MCQmedium

A technician is tasked with selecting a CPU for a small form factor (SFF) office PC that must run quietly and efficiently. Which CPU characteristic is most important for this build?

A.Highest possible clock speed
B.Integrated GPU
C.Low thermal design power (TDP)
D.Support for overclocking
AnswerC

Low TDP CPUs produce less heat, enabling passive or low-speed fan cooling for quiet operation.

Why this answer

In SFF builds, heat dissipation is limited, so a CPU with low TDP generates less heat, allowing for smaller, quieter cooling solutions. This tests understanding of how TDP impacts system design and noise levels.

Practice this question →
7
MCQhard

A technician is troubleshooting a system that randomly restarts under load. The CPU temperature never exceeds 75°C, and the power supply is rated at 750W. Which of the following should the technician check next?

A.Replace the CPU cooler
B.Check the CPU voltage settings in BIOS
C.Update the network driver
D.Replace the RAM
AnswerB

Insufficient Vcore voltage can cause random restarts under load even if temperatures are fine, as the CPU may not receive stable power.

Why this answer

When thermal and power supply are ruled out, voltage regulation becomes a suspect. The CPU's Vcore voltage may be set too low in BIOS, causing instability under load.

Practice this question →
8
MCQeasy

A user complains that their computer shuts down unexpectedly after a few minutes of gaming. You check the CPU temperature and find it is 105°C. What is the most likely cause?

A.Insufficient RAM
B.Failing power supply
C.Degraded thermal paste
D.Outdated BIOS
AnswerC

Degraded thermal paste reduces heat transfer, causing the CPU to overheat under load and trigger shutdowns.

Why this answer

High CPU temperature under load indicates a cooling problem. The most common cause is dried or improperly applied thermal paste between the CPU and heatsink. This prevents efficient heat transfer, leading to thermal throttling or shutdown.

Practice this question →
9
MCQhard

A technician is troubleshooting a PC that fails to POST. The CPU fan spins, but there is no display output. The motherboard has a diagnostic LED that shows a CPU error. Which step should the technician take first to resolve the issue?

A.Replace the power supply
B.Update the BIOS using a USB flashback
C.Reseat the CPU
D.Replace the CPU
AnswerC

Reseating the CPU can correct misalignment or poor contact, which is a common cause of CPU error LEDs.

Why this answer

A CPU error LED indicates a problem with the processor or its installation. The most common cause is improper seating or bent pins. Reseating the CPU is a logical first step before replacing components.

This tests systematic troubleshooting methodology.

Practice this question →
10
MCQmedium

A user reports that their computer randomly restarts when playing games. The technician suspects the CPU is overheating. Which tool should the technician use to monitor the CPU temperature under load?

A.Windows Task Manager
B.The BIOS/UEFI hardware monitor
C.A third-party utility like HWMonitor
D.Windows Event Viewer
AnswerC

HWMonitor logs CPU temperatures in real time, allowing the technician to see peak temperatures during gaming.

Why this answer

To diagnose overheating, a technician needs real-time temperature monitoring. A tool like HWMonitor or Core Temp provides accurate CPU temperature readings. BIOS/UEFI shows idle temps only, and Event Viewer logs crashes but not temperatures.

Practice this question →
11
MCQhard

A technician is upgrading a workstation from a dual-core CPU to a quad-core CPU. After installation, the system boots but only shows two cores in the operating system. The technician has already verified the CPU is properly seated. What is the most likely cause?

A.The CPU is counterfeit and only has two functional cores
B.The operating system is limited to two cores due to licensing
C.The motherboard BIOS is outdated and does not fully support the new CPU
D.The CPU cooler is too tight, causing physical damage to the CPU
AnswerC

An outdated BIOS can cause the system to misidentify the CPU, often detecting fewer cores. Updating the BIOS typically resolves this.

Why this answer

If the OS only detects half the cores, the CPU might be faulty, but a more common cause is that the motherboard's BIOS needs an update to support the new CPU's full feature set. Older BIOS versions may not recognize all cores.

Practice this question →
12
MCQmedium

A customer says their PC randomly freezes and sometimes displays a blue screen error. You run diagnostics and find that the CPU passes all tests, but the system still crashes. Which component should you check next as a likely cause of CPU-related instability?

A.The hard drive
B.The power supply unit
C.The CPU fan
D.The motherboard BIOS
AnswerC

A failing CPU fan can cause overheating and intermittent crashes, even if the CPU itself is functional.

Why this answer

Even if the CPU itself is functional, instability can arise from other factors. Overheating due to a failing fan can cause intermittent crashes. The CPU fan is critical for maintaining safe temperatures under load.

Practice this question →
13
MCQeasy

During a routine hardware upgrade, a technician installs a new CPU into a workstation. After powering on, the system emits a series of long beeps and the screen remains blank. What is the most likely cause?

A.The CPU is not compatible with the motherboard socket
B.The CPU is installed backwards
C.The RAM is not seated properly
D.The CPU fan is not connected to the motherboard
AnswerC

Long beeps during POST are a standard indication of a memory error, often caused by loose or improperly seated RAM.

Why this answer

POST beep codes are used to indicate hardware errors. A series of long beeps typically points to a memory issue, not a CPU problem. The technician should reseat the RAM modules to resolve this.

Practice this question →
14
MCQmedium

A technician is configuring a new PC for a user who runs multiple virtual machines. The motherboard has an AM5 socket. Which CPU feature is most important for this workload?

A.High clock speed
B.Large L3 cache
C.High core and thread count
D.Integrated graphics
AnswerC

Multiple VMs require many cores/threads to run simultaneously without performance degradation.

Why this answer

Virtual machines benefit from many cores and threads because each VM can be assigned to a separate core. AMD AM5 CPUs offer high core counts, making them ideal for virtualization. This tests understanding of how CPU architecture affects specific tasks.

Practice this question →
15
MCQmedium

A technician is selecting a CPU for a compact home theater PC (HTPC) that will be passively cooled. Which CPU characteristic is most critical to ensure reliable operation without a fan?

A.High clock speed
B.Integrated graphics
C.Low TDP
D.Large L3 cache
AnswerC

Low TDP means less heat generated, allowing the CPU to run safely without active cooling.

Why this answer

Passive cooling relies on low heat output. TDP (Thermal Design Power) directly indicates the amount of heat a cooler must dissipate. A low TDP CPU is essential for fanless operation.

Practice this question →
16
MCQmedium

A technician is building a new gaming PC and wants to ensure the CPU can handle heavy multitasking and overclocking. The motherboard supports both Intel and AMD CPUs, but the technician is unsure which CPU features to prioritize. Which CPU characteristic is most important for overclocking stability?

A.A high number of cores (e.g., 12 cores)
B.A large L3 cache (e.g., 32 MB)
C.An unlocked multiplier (e.g., Intel K-series or AMD Ryzen)
D.A high-quality aftermarket CPU cooler
AnswerD

Effective cooling is critical for overclocking stability because it prevents overheating, which is the main limiting factor when increasing clock speeds.

Why this answer

Overclocking increases the CPU's clock speed beyond stock settings, which generates more heat. A robust cooling solution is essential to maintain stability and prevent thermal throttling or damage. Other features like core count or cache are secondary for overclocking.

Practice this question →
17
MCQmedium

A technician is upgrading a server CPU to improve multi-threaded performance for a virtualization host. The current CPU has 8 cores and 16 threads. Which of the following specifications is most important to consider for compatibility?

A.CPU clock speed
B.CPU core count
C.CPU socket type
D.CPU TDP
AnswerC

The socket type must match the motherboard; otherwise, the CPU cannot be installed at all.

Why this answer

CPU upgrades require careful consideration of socket type, chipset support, and BIOS compatibility. The socket is the most critical physical compatibility factor.

Practice this question →
18
MCQmedium

A technician is replacing a CPU in a server that uses a LGA 1151 socket. After installing the new CPU and applying thermal paste, the system fails to post. The technician notices the CPU cooler is not making full contact with the CPU. What is the most likely consequence of this poor contact?

A.The CPU will operate at a lower clock speed but still function
B.The system will boot but display a warning about high CPU temperature
C.The CPU will overheat and the system will shut down to prevent damage
D.The CPU will be permanently damaged immediately
AnswerC

Without proper cooler contact, the CPU temperature rises rapidly, triggering the thermal shutdown protection before the OS loads.

Why this answer

Poor contact between the CPU and cooler prevents effective heat dissipation. The CPU will quickly overheat, triggering thermal protection that shuts down the system to prevent damage. This is a common issue after improper cooler installation.

Practice this question →
19
MCQmedium

A user reports that their computer is making a loud grinding noise and then shuts down after a few minutes. The CPU temperature is normal at idle. What is the most likely cause?

A.Hard drive failure
B.CPU fan bearing failure
C.Power supply fan failure
D.Loose CPU cooler
AnswerB

A failing fan bearing causes grinding noise and can lead to inadequate cooling under load, triggering thermal shutdown.

Why this answer

A grinding noise typically indicates a mechanical bearing failure in a fan. The CPU fan may still spin but fail under load, causing overheating and shutdown. This scenario tests the ability to correlate auditory symptoms with hardware failure.

Practice this question →
20
MCQeasy

A technician is building a new workstation for video editing. The motherboard supports LGA 1700 socket CPUs. Which of the following CPUs is compatible with this socket?

A.AMD Ryzen 7 5800X
B.Intel Core i5-13600K
C.Intel Core i7-9700K
D.AMD Threadripper 3970X
AnswerB

Intel 13th generation CPUs use LGA 1700, making this the correct choice.

Why this answer

This question tests knowledge of CPU socket compatibility. LGA 1700 is used by Intel 12th, 13th, and 14th generation processors. Choosing the correct socket ensures the CPU physically fits and operates.

Practice this question →
21
MCQeasy

A customer reports that their desktop computer intermittently freezes and emits a high-pitched whine. The issue occurs more frequently under heavy load, such as when rendering video. Which CPU-related feature is most likely causing this symptom?

A.CPU throttling due to overheating
B.Coil whine from the voltage regulator modules
C.A failing CPU fan bearing
D.Incorrect CPU multiplier setting in BIOS
AnswerB

Coil whine is a common electrical noise from VRMs under high current draw, often heard during heavy CPU load.

Why this answer

The high-pitched whine from a CPU under load is typically coil whine, caused by electrical vibrations in the voltage regulator modules (VRMs) or inductors. This is not a sign of failure but can be annoying. The correct answer identifies the source as power delivery components, not the CPU itself.

Practice this question →
22
MCQhard

A technician is diagnosing a system that fails to boot after a CPU upgrade. The old CPU worked fine. The new CPU is installed correctly, but the system beeps repeatedly (1 long, 3 short). Which of the following is the most likely issue?

A.The CPU is not receiving power
B.The RAM is incompatible with the new CPU
C.The motherboard BIOS does not support the new CPU
D.The CPU cooler is not installed properly
AnswerC

This beep code often indicates a CPU initialization failure, which is typical when the BIOS lacks microcode for the new processor.

Why this answer

Beep codes are diagnostic indicators. 1 long, 3 short beeps from an AMI BIOS typically indicate a memory or graphics issue, but in this context, it often points to the CPU not being fully supported or a BIOS incompatibility.

Practice this question →
23
MCQhard

A technician is upgrading a workstation and notices that the new CPU is not listed in the motherboard's supported CPU list. The motherboard uses an LGA 1200 socket. What is the most likely issue?

A.The CPU is physically too large for the socket
B.The motherboard's chipset does not support that CPU generation
C.The CPU requires more power than the motherboard can provide
D.The CPU is a server-grade processor not meant for workstations
AnswerB

The chipset must be compatible with the CPU's generation; otherwise, the system may not boot or may be unstable.

Why this answer

CPU compatibility depends on both socket and chipset. Even with the correct socket, the chipset may not support the CPU's power delivery or microcode. This question tests deeper knowledge of motherboard-CPU compatibility beyond just the socket.

Practice this question →
24
MCQmedium

During a motherboard replacement, a technician installs a new CPU but the system fails to POST. The CPU fan spins, but the screen remains blank. Which of the following should the technician check first?

A.Check if the CPU power connector is plugged in
B.Reseat the RAM modules
C.Verify the CPU is on the motherboard's supported CPU list and update BIOS if needed
D.Replace the CMOS battery
AnswerC

Many motherboards require a BIOS update to support newer CPUs; checking compatibility is the first logical step.

Why this answer

When a system fails to POST with a new CPU, the most common issue is compatibility or improper installation. The technician should verify the CPU is supported by the motherboard's BIOS version.

Practice this question →
25
MCQhard

A technician is troubleshooting a system that experiences random lockups and blue screens. The technician suspects a CPU issue but has already run a stress test without errors. Which diagnostic step should the technician perform next to isolate the problem?

A.Replace the CPU with a known good one
B.Update the motherboard BIOS to the latest version
C.Run a memory diagnostic tool like MemTest86
D.Check the CPU voltage in BIOS and increase it slightly
AnswerC

Memory errors can mimic CPU problems; testing RAM is a logical next step after CPU stress tests pass.

Why this answer

Random lockups and blue screens can also be caused by memory errors. Running a memory diagnostic tool like MemTest86 will test the RAM for faults, which can produce symptoms similar to a failing CPU. This helps rule out memory before replacing the CPU.

Practice this question →
26
MCQhard

A technician is configuring a server that requires maximum memory bandwidth for virtual machines. The motherboard has four memory slots and supports dual-channel architecture. The technician installs two 16 GB DIMMs. Which configuration will provide the best performance?

A.Install both DIMMs in slots 1 and 2 (same channel)
B.Install both DIMMs in slots 1 and 3 (different channels)
C.Install one DIMM in slot 1 and leave the other empty
D.Install both DIMMs in slots 2 and 3 (adjacent slots)
AnswerB

This populates both channels, enabling dual-channel mode and doubling memory bandwidth for better performance.

Why this answer

Dual-channel memory architecture requires matched pairs of DIMMs installed in specific slots (usually slots 1 and 3 or 2 and 4) to operate in dual-channel mode. Installing them in the same channel (e.g., slots 1 and 2) forces single-channel mode, halving memory bandwidth.

Practice this question →
27
MCQeasy

A customer reports that their desktop PC is running very slowly, especially when opening multiple applications. The system has 8 GB of RAM and a 1 TB HDD. You check Task Manager and see that the CPU is consistently at 100% usage even with only a few apps open. Which CPU characteristic is most likely causing this bottleneck?

A.Number of cores
B.Cache size
C.Clock speed
D.Thermal design power (TDP)
AnswerC

A low clock speed means the CPU processes instructions slowly, leading to high utilization and poor performance in everyday tasks.

Why this answer

This scenario tests understanding of how CPU clock speed affects multitasking performance. A low clock speed means the processor cannot execute instructions quickly enough, leading to high usage and sluggishness. Upgrading to a CPU with a higher clock speed would directly address the bottleneck.

Practice this question →
28
MCQhard

A technician needs to install a CPU that supports both DDR4 and DDR5 memory on a new motherboard. The motherboard manual lists support for only DDR5. Which of the following is the best course of action?

A.Install DDR4 RAM because the CPU supports it
B.Install DDR5 RAM as the motherboard supports it
C.Update the BIOS to enable DDR4 support
D.Use a different CPU that only supports DDR5
AnswerB

The motherboard dictates the memory type; the CPU's compatibility with both is irrelevant if the board only accepts DDR5.

Why this answer

Memory controllers are integrated into the CPU, but the motherboard's memory slots and BIOS determine which type is supported. If the board only supports DDR5, using a CPU that supports both will still require DDR5 modules.

Practice this question →
29
MCQeasy

A customer reports that their desktop computer randomly shuts down when they run video editing software. The system has a high-end GPU and 32 GB of RAM. During troubleshooting, you notice the CPU temperature quickly rises to 95°C under load. Which of the following is the most likely cause?

A.Insufficient power supply wattage
B.Faulty RAM module
C.CPU cooler fan failure or poor thermal paste application
D.Outdated BIOS firmware
AnswerC

A failed cooler or dried thermal paste prevents heat dissipation, causing the CPU to overheat and trigger thermal shutdown.

Why this answer

Overheating is a common cause of random shutdowns, especially under heavy load. The CPU thermal protection mechanism triggers to prevent damage. This scenario tests the understanding of thermal management and its impact on system stability.

Practice this question →
30
MCQeasy

A technician is upgrading a server CPU and needs to select a processor that supports ECC memory. Which CPU feature is required for ECC support?

A.Integrated GPU
B.Hyper-Threading
C.Memory controller
D.Overclocking capability
AnswerC

The memory controller must support ECC; many consumer CPUs lack this feature.

Why this answer

ECC memory requires support from the CPU's memory controller. Not all CPUs support ECC; it is typically found in workstation or server-class processors. This question tests knowledge of CPU features beyond just speed and cores.

Practice this question →

Ready to test yourself?

Try a timed practice session using only CPU questions.

Start 20-question session