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Sudheer M.
's Polls
GK
What was the active medium used in the first working laser ever constructed?
A diamond block
0 votes (0%)
A diamond block
Helium-neon gas
0 votes (0%)
Helium-neon gas
A ruby rod
0 votes (0%)
A ruby rod
Carbon dioxide gas
1 vote (100%)
Carbon dioxide gas
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Wolmal
(256 symbols max)
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