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
ELECTRONIC DEVICES
Question #90708
Back to Home
View All ELECTRONIC DEVICES Questions
51 Views
Question
What was used as a cathode in vacuum tubes for electron emission?
A. Cold cathode
B. Laser source
C. Solar cell
D. Heated cathode
Check Answer
Share on Twitter
Share on Facebook
Copy Link
Related Questions
What is the role of trivalent impurities in germanium?
66
In a half-wave rectifier circuit, what is the output frequency if the input is 50 Hz AC?
61
What is the output frequency of a half-wave rectifier if input is 50 Hz?
61