- A
The CPU is counterfeit and only has two functional cores
Why wrong: While possible, this is less common than a BIOS compatibility issue; a counterfeit CPU would likely have other problems.
- B
The operating system is limited to two cores due to licensing
Why wrong: Windows editions (e.g., Home) may limit physical CPUs but not cores; all cores should be visible.
- C
The motherboard BIOS is outdated and does not fully support the new CPU
An outdated BIOS can cause the system to misidentify the CPU, often detecting fewer cores. Updating the BIOS typically resolves this.
- D
The CPU cooler is too tight, causing physical damage to the CPU
Why wrong: An overtightened cooler could damage the CPU or motherboard, but it would likely cause boot failures or crashes, not just missing cores.
Quick Answer
The answer is that the motherboard BIOS is outdated and does not fully support the new quad-core CPU. When a system boots but only shows half the cores, the CPU is often properly seated and functional, but an older BIOS version lacks the microcode needed to recognize the processor’s full core count. This scenario tests your understanding of BIOS compatibility and firmware updates, a common troubleshooting step in the CompTIA A+ Core 1 220-1201 exam. A frequent trap is assuming the CPU is faulty or misseated, but the search intent “CPU only shows half cores BIOS update” points directly to a firmware mismatch. Remember: the OS sees what the BIOS tells it, so if the BIOS doesn’t know about the new cores, it won’t report them. Memory tip: “BIOS before blame” — always update the BIOS before suspecting a dead CPU.
220-1101 CPU Practice Question
This 220-1201 practice question tests your understanding of cpu. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The motherboard BIOS is outdated and does not fully support the new CPU
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The CPU is counterfeit and only has two functional cores
Why it's wrong here
While possible, this is less common than a BIOS compatibility issue; a counterfeit CPU would likely have other problems.
- ✗
The operating system is limited to two cores due to licensing
Why it's wrong here
Windows editions (e.g., Home) may limit physical CPUs but not cores; all cores should be visible.
- ✓
The motherboard BIOS is outdated and does not fully support the new CPU
Why this is correct
An outdated BIOS can cause the system to misidentify the CPU, often detecting fewer cores. Updating the BIOS typically resolves this.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The CPU cooler is too tight, causing physical damage to the CPU
Why it's wrong here
An overtightened cooler could damage the CPU or motherboard, but it would likely cause boot failures or crashes, not just missing cores.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 220-1201 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which 220-1201 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
- →
CPU — study guide chapter
Learn the concepts, then practise the questions
- →
CPU practice questions
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CompTIA A+ Core 1 220-1201 study guide
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FAQ
Questions learners often ask
What does this 220-1201 question test?
CPU — This question tests CPU — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The motherboard BIOS is outdated and does not fully support the new CPU — 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.
What should I do if I get this 220-1201 question wrong?
Identify which 220-1201 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 18, 2026
This 220-1201 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 220-1201 exam.
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