Content protected from screenshots
GKFix.in
General Knowledge
Categories
Concept Builder Quiz
About Us
Start Quiz
Home
My Profile
General Knowledge
Categories
Concept Builder
Start Quiz
Logout
GKFix MCQ Question
Test your knowledge and learn something new
Home
Inventions
Question #6069
Back to Home
View All Inventions Questions
26 Views
Question
In which decade were the first successful diode and triode vacuum tubes invented?
A. 1800s
B. 1880s
C. 1890s
D. 1900s
Check Answer
Share on Twitter
Share on Facebook
Copy Link
Related Questions
Which of the following is a literary invention?
38
Which of the following is NOT a criterion for patentability in most countries?
23
Where were wigs first invented?
33