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Sound — Physics Questions & Practice

8 Sound questions from Physics for competitive exams such as UPSC, Banking, SSC and Railway. Read the worked questions below, check every answer with an explanation, and track what you get wrong. का अभ्यास करें

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Sound पर अभ्यास प्रश्न — उत्तर सहित

Try each question first, then open the answer. Explanations are included.

1. What term describes the number of sound wave cycles occurring per second, determining pitch?

  1. ATimbre
  2. BFrequency
  3. CAmplitude
  4. DWavelength
उत्तर दिखाएँ

उत्तर: B

Frequency, measured in Hertz (Hz), is the number of wave cycles per second and determines the pitch of a sound - higher frequency means higher pitch.

2. What is the repeated reflection of sound causing a delayed, distinct repetition called?

  1. AResonance
  2. BEcho
  3. CDoppler effect
  4. DReverberation
उत्तर दिखाएँ

उत्तर: B

An echo is a distinct, delayed repetition of a sound caused by reflection off a surface, perceived as a separate sound when the delay exceeds about 0.1 seconds.

3. What term describes the maximum displacement of a sound wave, determining loudness?

  1. AFrequency
  2. BAmplitude
  3. CWavelength
  4. DPitch
उत्तर दिखाएँ

उत्तर: B

Amplitude is the maximum displacement of a wave from its resting position; greater amplitude corresponds to louder sound.

4. What is the approximate speed of sound in air at room temperature (about 20C)?

  1. A3x10^8 m/s के बारे में
  2. B100 m/s के बारे में
  3. C343 m/s के बारे में
  4. D1500 m/s के बारे में
उत्तर दिखाएँ

उत्तर: C

Sound travels at approximately 343 m/s in dry air at 20C; this speed increases with temperature.

5. What term describes sound waves with frequencies below the range of human hearing (below 20 Hz)?

  1. AInfrasonic waves (Infrasound)
  2. BUltrasonic waves
  3. CAudible waves
  4. DMicrowaves
उत्तर दिखाएँ

उत्तर: A

Infrasonic waves have frequencies below 20 Hz (the lower limit of human hearing), sometimes produced by natural events like earthquakes.

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