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प्रश्न
Which device works on the principle of vacuum tubes and was used in television and computer monitors?
विकल्प
Liquid Crystal Display (LCD) monitors
Solid-state semiconductor junctions
Cathode Ray Tubes (CRT)
Galena crystals with a metal point contact
MCQ
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उत्तर
Cathode Ray Tubes (CRT) work on the principle of vacuum tubes. They were used in television and computer monitors.
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