220-1201 Practice Question: That their smartphone's screen protector has a…

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 screen protector is incompatible with the phone model.

  Why it's wrong here

  Incompatibility between a screen protector and a phone model typically manifests as incorrect physical dimensions, such as misaligned cutouts for cameras or sensors, or the protector not fully covering the screen or overhanging edges. While a poor fit might indirectly contribute to lifting over time, it does not directly cause adhesive bubbles or immediate lifting edges, which are primarily issues of surface adhesion rather than size mismatch.

• ✗

  The phone's screen has a manufacturing defect.

  Why it's wrong here

  A manufacturing defect in a phone's screen, such as dead pixels, touch sensitivity issues, or display discoloration, pertains to the internal functionality and visual output of the display. These internal defects do not alter the physical surface properties or flatness of the glass in a way that would prevent a screen protector's adhesive from bonding correctly or cause it to bubble or lift after installation.

• ✓

  The user did not properly clean the screen before installation.

  Why this is correct

  Microscopic dust particles, oils from fingerprints, or residual moisture left on the smartphone's screen surface before applying the screen protector create physical barriers between the protector's adhesive layer and the glass. These contaminants prevent a complete and uniform bond, leading to trapped air pockets (bubbles) where the adhesive cannot properly adhere, and weakened adhesion along the edges that results in premature lifting. This is the most common cause of such installation failures.

• ✗

  The screen protector is a tempered glass type, which is prone to bubbles.

  Why it's wrong here

  Tempered glass screen protectors are actually less prone to bubbles than flexible plastic film protectors when installed correctly, due to their rigid nature which helps them lay flat and expel air more efficiently. The material itself is not inherently prone to bubbles; rather, bubbles and lifting edges are almost always a consequence of improper installation technique, such as inadequate screen cleaning or incorrect alignment, regardless of the protector's material type.

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