This FC0-U61 practice question tests your understanding of it concepts and terminology. 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 user reports that their computer is running slowly. Which of the following 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.
Running too many applications simultaneously
Excessive applications consume RAM and CPU, causing slowness.
The monitor is too small
Why wrong: Monitor size affects display, not processing speed.
The keyboard is unresponsive
Why wrong: Keyboard responsiveness is a peripheral issue, not a system performance issue.
The mouse needs batteries
Why wrong: Low mouse batteries affect mouse functionality, not computer speed.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Running too many applications simultaneously
When too many applications are running simultaneously, the computer's RAM and CPU resources become oversubscribed, forcing the operating system to rely heavily on virtual memory (paging to disk). This causes excessive disk I/O and context switching, which directly degrades system responsiveness and leads to the perception of slowness.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Running too many applications simultaneously
Why this is correct
Excessive applications consume RAM and CPU, causing slowness.
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 monitor is too small
Why it's wrong here
Monitor size affects display, not processing speed.
The keyboard is unresponsive
Why it's wrong here
Keyboard responsiveness is a peripheral issue, not a system performance issue.
The mouse needs batteries
Why it's wrong here
Low mouse batteries affect mouse functionality, not computer speed.
Common exam traps
CompTIA often tests the misconception that peripheral issues (like monitor size or battery status) are the primary cause of system slowness, when in fact resource contention from concurrent processes is the most common culprit.
Detailed technical explanation
Under the hood, each running application consumes a process with its own virtual address space and threads. When total RAM demand exceeds physical capacity, the OS's memory manager (e.g., Windows Memory Manager) begins swapping pages to the pagefile on disk, which is orders of magnitude slower than RAM. Additionally, the CPU scheduler must perform more context switches, increasing overhead and reducing the time slices available to foreground tasks.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the FC0-U61 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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
IT Concepts and Terminology — This question tests IT Concepts and Terminology — Read the scenario before looking for a memorised answer..
The correct answer is: Running too many applications simultaneously — When too many applications are running simultaneously, the computer's RAM and CPU resources become oversubscribed, forcing the operating system to rely heavily on virtual memory (paging to disk). This causes excessive disk I/O and context switching, which directly degrades system responsiveness and leads to the perception of slowness.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This FC0-U61 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 FC0-U61 exam.
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