TestOut LabSim A+ Certification Practice Exam

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Your CRT monitor is flickering. What is a recommended solution?

Change the input source
Increase the refresh rate
Lower the brightness settings
Adjust the contrast settings

The correct answer is: Increase the refresh rate

A CRT (cathode ray tube) monitor flickering can often be attributed to an inadequate refresh rate. The refresh rate is the number of times per second that the screen redraws the image. If the refresh rate is set too low, it can lead to visible flickering, which can be uncomfortable for the eyes and may even cause headaches during prolonged use. Increasing the refresh rate can help eliminate flicker because it reduces the amount of time each image is displayed before it is refreshed again. A higher refresh rate means that the screen is updating more frequently, providing a smoother image and reducing perceptible flicker. This is particularly important for CRT monitors, which are more susceptible to flickering at lower refresh rates compared to modern LCDs. Adjusting other settings, such as brightness or contrast, generally affects the visibility and appearance of the image but won't address the inherent refresh rate issue that causes flickering. Similarly, changing the input source might eliminate flickering if there's an input compatibility issue, but it won’t resolve a refresh rate problem specific to the monitor itself. Therefore, increasing the refresh rate is the most effective solution for reducing flicker on a CRT monitor.