Question 1
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In which decade were the first successful diode and triode vacuum tubes invented?
- A 1800s
- B 1880s
- C 1890s
- D 1900s Correct
Correct Answer: Option D
In 1904, John Ambrose Fleming invented the first practical electron tube called the 'Fleming Valve', which is a diode rectifier. In 1906, Lee de Forest invented the audio later called the triode, which provided signal amplification.
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