when was vacuum tube invented

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Q:
When was vacuum tube invented?

1
1900
2
1910
3
1880
4
1906

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Answer : 4. " 1906 "

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Q:
When was vacuum tube invented?

Answer : 4. " 1906 "

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Q: When was vacuum tube invented?

Answer : 4. " 1906 "

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Q:
When was vacuum tube invented?

Q.
Which Indian state has the least literacy rate?

Q.
Which language is spoken in Karnataka?

Q.
What is the chief source of political power in India?

Q.
Which one of the following plants is popularly grown along the road for absorbing vehicular pollutants?