The answer is that the scan mode is set to simplex instead of duplex. This is the most likely cause because the automatic document feeder (ADF) is physically feeding the pages, but the scanner’s software or driver is configured to capture only one side of each sheet. When duplex scanning is enabled, the device flips the page or uses dual scan heads to capture both sides; with simplex mode active, the back sides are simply ignored, resulting in blank images. On the CompTIA A+ Core 1 220-1201 exam, this scenario tests your understanding of multifunction printer settings and common configuration errors—a frequent trap is assuming a hardware jam or sensor failure when the issue is purely a software toggle. Remember the mnemonic “Simplex = Single side, Duplex = Double side” to quickly recall that blank backs almost always point to a simplex setting.
220-1201 Multifunction Devices Practice Question
This 220-1201 practice question tests your understanding of multifunction devices. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 complains that when they scan a double-sided document using the automatic document feeder (ADF) on their multifunction printer, the back sides of the pages are blank. The printer supports duplex scanning. 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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The scan mode is set to simplex instead of duplex
This scenario tests knowledge of duplex scanning settings on a multifunction device. The ADF is feeding pages correctly, but the printer is set to simplex scanning, which only scans one side. Changing the scan mode to duplex will resolve the issue.
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 ADF rollers are worn out
Why it's wrong here
Worn rollers would cause paper jams or misfeeds, not blank back sides.
✗
The scan resolution is set too low
Why it's wrong here
Low resolution would produce poor image quality, not blank pages.
✓
The scan mode is set to simplex instead of duplex
Why this is correct
Simplex mode scans only one side; duplex mode is required to capture both sides of a document.
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 document is too thick for the ADF
Why it's wrong here
Thickness would cause jams or feed errors, not blank back sides.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 220-1201 question in full detail.
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.
Multifunction Devices — This question tests Multifunction Devices — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The scan mode is set to simplex instead of duplex — This scenario tests knowledge of duplex scanning settings on a multifunction device. The ADF is feeding pages correctly, but the printer is set to simplex scanning, which only scans one side. Changing the scan mode to duplex will resolve the issue.
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.
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Question Discussion
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