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UPSC 2000: A noise level of 100 decibels would correspond to
(a)just audible sound
(b)ordinary conversation
(c)sound from a noisy street
(d)noise from a machine shop
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Not attemptedCorrect Answer: (d) noise from a machine shop
According to the UPSC answer key, a sound level of about 100 dB corresponds to the very loud environment of a machine shop (option d). Lower levels such as ordinary conversation (~60 dB) or street noise (~70–80 dB) are well below 100 dB, while ‘just audible’ is near 0 dB. ([educationobserver.com](https://www.educationobserver.com/forum/attachment.php?aid=27910))
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Frequently Asked Questions
What is the correct answer to this UPSC 2000 Science & Technology question?▼
The correct answer is option (d): noise from a machine shop. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Physics question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2000, GS Paper 1, as Question 96. It falls under Science & Technology > Physics.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
How many UPSC Prelims questions have been asked from Physics?▼
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.