220-1101 Mobile Devices Practice Question
A user reports that their smartphone will not charge when connected to a known-good charger and cable. The technician examines the charging port and sees debris inside. Which of the following tools should the technician use to safely remove the debris?
⚠ Common exam trap
The 220-1101 exam often tests the misconception that compressed air is always safe for electronics, but in a charging port with visible debris, it can worsen the blockage rather than clear it.
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
✓
A wooden toothpick
A wooden toothpick is non-conductive and non-abrasive, making it safe to dislodge debris from a smartphone charging port without risking short circuits or damaging the delicate pins inside the USB-C or Lightning connector. Metal tools can cause electrical shorts or scratch the port's contacts, while compressed air may push debris deeper, and alcohol with a cotton swab can leave fibers or moisture that interfere with charging.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
A wooden toothpick
Why this is correct
A wooden toothpick is the safest choice because wood is non-conductive, eliminating the risk of shorting the charging contacts. Its relatively soft structure allows you to gently scrape or hook out compacted lint and debris without scratching or bending the delicate pins inside the port. The pointed shape fits into narrow openings, and you can trim it to a custom angle for better reach, but be careful not to break the tip off inside the port.
- ✗
A metal paperclip
Why it's wrong here
A metal paperclip is dangerously conductive and far too rigid for cleaning a charging port. The hard metal can scratch the copper or gold-plated contact fingers, damaging their thin plating and leading to corrosion or poor electrical contact. If the phone is powered on, the paperclip can short adjacent pins together, potentially triggering over-current protection or causing permanent damage to the charging IC. It may also bend the port's internal retention springs, making the charging cable loose.
When this WOULD be correct
A metal paperclip would be correct for pressing a reset button on a device (e.g., router or smartphone) that requires a small, rigid tool to access a recessed button, where conductivity is not a concern.
- ✗
A can of compressed air
Why it's wrong here
Compressed air is inadequate for charging port debris because it lacks the mechanical force needed to dislodge compacted lint or dust. The high-velocity stream can actually drive particulate matter deeper into the port, where it becomes even more tightly packed against the connector pins and may eventually cause an intermittent connection or a short. Additionally, the blast of air can push debris into adjacent openings, like the speaker or microphone mesh, creating new problems rather than solving the original charging issue.
When this WOULD be correct
When cleaning dust or loose particles from a keyboard, laptop vents, or other electronic components where gentle air flow can dislodge debris without risk of pushing it into sensitive areas.
- ✗
Isopropyl alcohol and a cotton swab
Why it's wrong here
A cotton swab is typically too large to fit inside a smartphone charging port, and residual alcohol or cotton fibers could cause further issues. This method is not ideal for removing solid debris from small ports.
When this WOULD be correct
This option would be correct if the question described a charging port with corrosion or sticky residue (e.g., from a spilled sugary drink) that needs to be dissolved and cleaned, and the device is powered off and allowed to dry completely.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 220-1101 exam frequently reuses these exact scenarios with slightly different constraints.
✓A wooden toothpickCorrect answer▾
Why this is correct
A wooden toothpick is the safest choice because wood is non-conductive, eliminating the risk of shorting the charging contacts. Its relatively soft structure allows you to gently scrape or hook out compacted lint and debris without scratching or bending the delicate pins inside the port. The pointed shape fits into narrow openings, and you can trim it to a custom angle for better reach, but be careful not to break the tip off inside the port.
✗A metal paperclipWrong answer — click to see why▾
Why this is wrong here
A metal paperclip is conductive and could short-circuit the charging port's pins or scratch the contacts, causing permanent damage. It is not safe for removing debris from electronic ports.
★ When this WOULD be the correct answer
A metal paperclip would be correct for pressing a reset button on a device (e.g., router or smartphone) that requires a small, rigid tool to access a recessed button, where conductivity is not a concern.
Why candidates choose this
Candidates may think a metal paperclip is sturdy enough to dislodge debris and overlook the risk of electrical shorting or physical damage to delicate port components.
✗A can of compressed airWrong answer — click to see why▾
Why this is wrong here
Compressed air can force debris deeper into the charging port or damage delicate internal components, and it is ineffective for removing compacted debris.
★ When this WOULD be the correct answer
When cleaning dust or loose particles from a keyboard, laptop vents, or other electronic components where gentle air flow can dislodge debris without risk of pushing it into sensitive areas.
Why candidates choose this
Candidates may think compressed air is a safe, non-contact cleaning method, overlooking that it can embed debris further into a small port like a smartphone charging port.
✗Isopropyl alcohol and a cotton swabWrong answer — click to see why▾
Why this is wrong here
Isopropyl alcohol and a cotton swab are used for cleaning corrosion or oxidation, not for removing solid debris like dust or lint from a charging port. The liquid could also damage internal components if not fully dried.
★ When this WOULD be the correct answer
This option would be correct if the question described a charging port with corrosion or sticky residue (e.g., from a spilled sugary drink) that needs to be dissolved and cleaned, and the device is powered off and allowed to dry completely.
Why candidates choose this
Candidates may think alcohol is a safe general-purpose cleaner for electronics, and a cotton swab seems gentle enough for the port, overlooking that solid debris requires physical removal without liquid.
Analysis generated from the official 220-1101blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Go deeper
Related to this question
Key term
Universal Serial Bus
A Universal Serial Bus (USB) is a standard interface that allows you to connect devices like keyboards, mice, storage drives, and printers to a computer for data transfer and power delivery.
Key term
Universal Serial Bus Type C
A small, reversible 24-pin USB connector that supports high-speed data transfer, power delivery, and video output, used in modern devices.
About these practice questions
This 220-1101 question is part of Courseiva's 896-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 220-1101 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 220-1101 exam.