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106. Which one of the following can be used to confirm whether drinking water contains a gamma-emitting isotope or not?
108. When the same note is played on a sitar and a flute, the sound produced can be distinguished from each other because of the difference in
111. Optical fibre works on the principle of
The correct answer is option (d): 310. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
This question was asked in UPSC CSE Prelims 1995, GS Paper 1, as Question 107. It falls under Science & Technology > Physics.
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
UPSC has asked 104 questions from Physics (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.