220-802 Question #10: Real Exam Question with Answer & Explanation

The correct answer is D: Distorted image. A strong magnetic field causes the electron beam in a CRT to deflect improperly, resulting in color distortion and a warped image on the screen.

Question

A large magnet is placed too close to a CRT monitor. Which of the following will MOST likely occur?

Options

ADead pixels
BFlickering image
CNo image on screen
DDistorted image

Explanation

A strong magnetic field causes the electron beam in a CRT to deflect improperly, resulting in color distortion and a warped image on the screen.

Common mistakes.

A. Dead pixels are a defect specific to LCD panels where individual liquid crystal cells fail permanently; CRT monitors do not have pixels in this sense and magnets do not cause this effect.
B. Flickering on a CRT is typically caused by a refresh rate set too low or a failing power supply, not by external magnetic fields.
C. A complete loss of image would require total disruption of the high-voltage circuitry or electron gun; a nearby magnet typically deflects the beam rather than eliminating it entirely.

Concept tested. Effect of magnetic fields on CRT monitor image

Reference. https://www.itu.int/rec/R-REC-BT.498/en

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