220-1101 Mobile Devices Practice Question
A user accidentally drops their smartphone into a saltwater pool. They retrieve it within seconds and wipe the exterior dry. The phone is still powered on, but the screen is flickering and the touchscreen is unresponsive. Which of the following should the user do FIRST to maximize the chance of successful recovery?
⚠ Common exam trap
CompTIA often tests the misconception that moisture absorption methods like rice are effective first steps, when in reality the immediate priority is to eliminate electrical current to prevent short-circuit damage.
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
✓
Power off the phone immediately
Powering off the phone immediately (B) is the correct first step because saltwater is highly conductive and corrosive. Even after wiping the exterior, residual moisture and salt ions inside the device can cause short circuits and electrochemical corrosion that rapidly damage internal components. Cutting power stops the flow of current through the wet circuits, minimizing the risk of permanent damage and giving the user the best chance of successful recovery through proper drying.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Place the phone in a bag of uncooked rice to absorb moisture
Why it's wrong here
The rice-bag trick fundamentally misunderstands damage from saltwater immersion. A smartphone is not a sealed chamber; rice cannot force evaporation out of tight internal crevices, and a sealed battery area traps humidity inside. More critically, uncooked rice absorbs moisture from its surroundings but does nothing to remove the corrosive salt crystals that remain embedded on circuit boards and connectors. The rice's starch dust can even contaminate logic board contacts, adding an additional failure vector. Therefore, this step not only fails to address the real hazard but introduces new particulate contamination.
- ✓
Power off the phone immediately
Why this is correct
Powering off the phone immediately removes electrical potential from the logic board and battery, which is the single most effective way to halt electrochemical corrosion. Saltwater is a strong electrolyte; with power applied, ionic current can flow across exposed traces and pins, driving metal migration and formation of conductive dendrites that cause shorts. Cutting power breaks the current path so that even if salt bridges two conductors, no net current drives electromigration or electrolysis. This action also eliminates the risk of thermal runaway from a shorted battery circuit. Oxygen and water alone corrode more slowly than an active voltage differential, so power-off buys critical time for proper cleaning.
- ✗
Connect the phone to a charger to see if it will respond
Why it's wrong here
Connecting a wet saltwater-damaged phone to a charger is arguably the most dangerous of the proposed actions because it re-energizes the circuit while the electrolyte is still present. Saltwater bridges between power rails and logic signals, so applying external voltage forces current through unintended paths, instantly baking components or blowing the power management IC. Even if the phone appears to respond briefly, the current accelerates corrosion at a microscopic level, turning a possibly repairable board into a shorted brick. The phone must first be disassembled, cleaned, and thoroughly dried before any attempt to power it on or charge it. Testing for response with live power is premature and likely irreversible.
- ✗
Use a hair dryer on high heat to dry the phone quickly
Why it's wrong here
High heat from a hair dryer can damage internal components, melt adhesives, or warp plastic parts. Additionally, it may push moisture deeper into the device. Low heat or room temperature drying is safer, but power off first is paramount.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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