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ICSE Class 9 Sound — practice questions

Explore 26 free Sound questions in ICSE Class 9 Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Sound questions and exercises with answers

Showing questions 1–26 of 26.

Sound is a form of energy that producesRead the answer and worked solution →Sound is produced byRead the answer and worked solution →Sound waves need a medium to travel through. They cannot travel throughRead the answer and worked solution →Frequency of a sound wave is measured inRead the answer and worked solution →Velocity V, frequency f and wavelength of a wave are related asRead the answer and worked solution →A wave has frequency 256 Hz and wavelength 1.32 m. Its speed isRead the answer and worked solution →Speed of sound in air at 0 deg C is aboutRead the answer and worked solution →Sound travels fastest inRead the answer and worked solution →The frequency range of audible sound for a normal human ear isRead the answer and worked solution →Sounds below 20 Hz frequency are calledRead the answer and worked solution →Sounds above 20000 Hz frequency are calledRead the answer and worked solution →Ultrasonic differs from supersonic because supersonic refers toRead the answer and worked solution →Lightning and thunder reach an observer at different times becauseRead the answer and worked solution →A bat emits ultrasonic pulses at 50 kHz to navigate. This method is calledRead the answer and worked solution →Ultrasonic waves are used in medicine forRead the answer and worked solution →Ultrasonic waves are used in industry toRead the answer and worked solution →The wavelength of a sound wave of frequency 660 Hz travelling at 330 m/s isRead the answer and worked solution →A sound wave has wavelength 0.66 m in air where speed of sound is 330 m/s. Its frequency isRead the answer and worked solution →An observer is 660 m away from a thundercloud. The sound of thunder reaches him after (V = 330 m/s)Read the answer and worked solution →Match the sound wordsRead the answer and worked solution →Loud or feebleRead the answer and worked solution →Can humans hear itRead the answer and worked solution →Frequency figuresRead the answer and worked solution →Sound facts, true or falseRead the answer and worked solution →The sound sentenceRead the answer and worked solution →Quick sound picksRead the answer and worked solution →

Worked practice questions

Sound is a form of energy that produces

  1. The sensation of hearing in our ears
  2. The sensation of sight in our eyes
  3. The sensation of smell in our nose
  4. The sensation of taste on our tongue
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Correct answer: A. The sensation of hearing in our ears

1. Section 8.1 defines sound. 2. It says sound is a form of energy. 3. It causes hearing when it reaches our ears. 4. Hence option A is correct. _Source: Selina Concise Physics Class 9, Ch 8 Sound (Mistral OCR'd PDF), section 8.1_

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Sound is produced by

  1. Heat radiation of a body
  2. Vibration of a body
  3. Magnetisation of a body
  4. Ionisation of a body
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Correct answer: B. Vibration of a body

1. The chapter section 8.1 lists three experiments. 2. A rubber string, a wire and a tuning fork all vibrate. 3. When they stop vibrating, the sound stops too. 4. So vibration is the source of sound. _Source: Selina Concise Physics Class 9, Ch 8 Sound (Mistral OCR'd PDF), section 8.1 experiments_

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Sound waves need a medium to travel through. They cannot travel through

  1. Water in a sealed pipe
  2. Air at room temperature
  3. Vacuum
  4. Iron rod under hammer
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Correct answer: C. Vacuum

1. Sound is a mechanical wave. 2. It needs particles to pass energy along. 3. A vacuum has no particles. 4. Hence sound cannot travel through vacuum. _Source: Selina Concise Physics Class 9, Ch 8 Sound (Mistral OCR'd PDF), section on medium_

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