Physics: Modern Physics: UPSC Previous Year Questions (Science and Technology)
1 previous year UPSC Prelims question on Physics: Modern Physics (Science and Technology). Choose an option to see the answer and explanation.
Explanations state facts as of the year each question was asked; words like “recently” refer to that year.
Showing 1–1 of 1 question
UPSC 2006Science and Technology · Physics: Modern Physics
Q1. What does the term Dolby B or Dolby C printed on tape- recorders and other sound systems refer to:
Explanation
Option (c) is correct: Dolby B and Dolby C are noise reduction systems developed by Dolby Laboratories to reduce the background hiss (high-frequency noise) in analog audio recordings, such as cassette tapes. These systems work by compressing and expanding certain frequency ranges during recording and playback to enhance audio clarity. Options (a), (c) and (d) are incorrect:
Frequency Modulated System known as FM is a modulation technique used in radio transmissions, not in tape noise reduction. Amplitude Modulated Systems AM is another modulation technique used in radio, unrelated to Dolby noise reduction. Dolby systems are unrelated to power supply types DC and AC.
Answer key for these questions
Q
UPSC year
Correct answer
1
2006
(c) noise Reduction Circuit
Frequently asked questions
How many previous year UPSC questions are there on Physics: Modern Physics?
This page covers 1 previous year UPSC Prelims GS Paper-I questions on Physics: Modern Physics (Science and Technology), asked from 1996 to 2007. Each has the correct answer and an explanation.
How should I use previous year UPSC questions for Prelims?
Attempt each question first, then open the answer and read the explanation for every option. Repeat by chapter, and track which statements UPSC reuses across years. Previous year questions show the exam pattern and difficulty level.
Which years are covered for Physics: Modern Physics?
Questions on Physics: Modern Physics (Science and Technology) are available for 6 years, from 1996 to 2007. Use the Year filter to practise a single paper.
