NCERT Exemplar Class 9 Science: Chapter 12 Sound Solutions
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Questions and Answers

When a key of a mechanical piano is struck gently and then struck again but much harder, what happens to the sound produced?

  • The pitch of the sound remains the same
  • The sound becomes louder and the pitch increases (correct)
  • The sound becomes quieter but the pitch increases
  • The sound becomes louder but the pitch decreases

    • What is a note in terms of sound?

  • Always unpleasant to listen
  • A single frequency
  • A mixture of several frequencies (correct)
  • A mixture of two frequencies only

    • What is the main focus of NCERT Exemplar Solutions for Class 9 Science Chapter 12 - Sound?

  • The range of hearing
  • The production of sound
  • The application of ultrasound (correct)
  • Sound propagation

    • What is the range of hearing?

    <p>20-20,000 Hz</p> Signup and view all the answers

    What types of questions are included in the NCERT Exemplar Solutions for Class 9 Science Chapter 12 - Sound?

    <p>MCQs, short answer questions, and long answer questions</p> Signup and view all the answers

    How are ultrasound waves applied in NCERT Exemplar Solutions for Class 9 Science Chapter 12 - Sound?

    <p>For medical imaging</p> Signup and view all the answers

    What type of waves are used in SONAR?

    <p>Ultrasonic waves</p> Signup and view all the answers

    What happens to the sound in the second case?

    <p>The sound will be louder, but the pitch will not be different</p> Signup and view all the answers

    In which medium does sound travel?

    <p>Disturbance moves</p> Signup and view all the answers

    How do we change feeble sound to loud sound?

    <p>Amplitude</p> Signup and view all the answers

    In the given curve, where is half the wavelength?

    <p>BD</p> Signup and view all the answers

    What kind of sound does an earthquake produce before the main shock wave begins?

    <p>Infrasound</p> Signup and view all the answers

    Who can hear infrasound?

    <p>Rhinoceroses</p> Signup and view all the answers

    What does a sitarist adjust before playing in a musical concert?

    <p>Frequency of the sitar string with the frequency of other musical instruments</p> Signup and view all the answers

    What is the effect of adjusting tension and plucking the string suitably by a sitarist before playing in a concert?

    <p>Change in frequency of the sitar string with other musical instruments</p> Signup and view all the answers

    What factor does loudness depend on?

    <p>Force by which a key is pressed</p> Signup and view all the answers

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