Question : Which of the following devices is used in digital circuits so that information stored in large computer memories is not lost during a momentary electric power failure?
Option 1: Thermistor
Option 2: Diode
Option 3: Transmitter
Option 4: Capacitor
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Correct Answer: Capacitor
Solution : The correct option is a Capacitor.
In digital circuits, a capacitor is used to prevent information loss during momentary power failures. It acts as a temporary energy storage device, storing charge and providing a brief power supply to maintain memory integrity. This helps preserve data in computer memories when there is a short disruption in power.