220-1101 Mobile Devices Practice Question
A user reports that their smartphone will not charge. A technician inspects the charging port and notices debris inside the port. Which of the following tools should the technician use to safely clean the debris?
⚠ Common exam trap
A common mix-up: candidates choose compressed air (A) thinking it's a standard cleaning method, but they overlook the risk of pushing debris deeper into the port, which is a common failure point in mobile device repairs.
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 the charging port without damaging the delicate pins or shorting the connector. Compressed air can push debris deeper, metal objects risk scratching or shorting contacts, and cotton swabs may leave fibers or moisture behind.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Compressed air
Why it's wrong here
Compressed air may seem harmless, but it can drive compacted lint and metallic debris deeper into the port, jamming it against the spring-loaded pins or porous mesh and causing intermittent shorts. The high-pressure blast also risks displacing small components like the SIM tray retainer or pushing contaminants into the screen gap. For impacted debris, compressed air is ineffective and can make the situation worse, so it is not the recommended first-line approach.
- ✓
A wooden toothpick
Why this is correct
A wooden toothpick is ideal because its relative softness lets it gently scrape compacted debris from the port walls without gouging the brass or copper contacts. Wood is dry and non-conductive, so there is zero risk of shorting the Vbus or data pins during mechanical agitation. Slightly flattening the tip under bright light allows it to reach the deep crevices without breaking off, making it the safest, most reliable tool for routine charging port cleaning.
- ✗
A metal paperclip
Why it's wrong here
A metal paperclip is dangerously conductive; sliding it across the exposed charging pins can momentarily short Vbus to ground, triggering overcurrent protection or injecting electrical stress into the charge controller, potentially causing permanent component failure. The sharp tip also scratches the protective plating on the port's internal pins and can bend or dislodge the fragile retaining fingers, leading to loose connections or total charge failure. Even with the phone unplugged, risk of ESD damage makes a metal tool unacceptable.
- ✗
A cotton swab with alcohol
Why it's wrong here
Although isopropyl alcohol can dissolve oily residue, a cotton swab is too large to fully enter the narrow charging cavity and leaves behind cotton fibers that can get snagged on the port's internal retaining nooks. These fibers act as a partial insulator and can combust when high-current charging flows, while residual alcohol wicks into the port's seam and may trigger moisture-detection warnings that disable charging. Cotton swabs are better suited for cleaning the exterior seams, not the electrical contacts deep inside the port.
About these practice questions
Courseiva writes every 220-1101 question from scratch — 896 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or 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.