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Sound

Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.

Production and Propagation of Sound

Subtopic

Production and Propagation of Sound under Sound for Grade 9 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Which of these materials will allow sound to propagate?

    A.

    Iron rod

    B.

    Water

    C.

    Air

    D.

    All of these

  2. 2.

    What is the relation between frequency (ν\nu) and time period (TT)?

    A.

    ν=T\nu = T

    B.

    ν=1/T\nu = 1/T

    C.

    ν=T2\nu = T^2

    D.

    ν=T\nu = \sqrt{T}

  3. 3.

    If the amplitude of a sound wave is increased, the sound becomes:

    A.

    Shriller

    B.

    Louder

    C.

    Softer

    D.

    Lower in pitch

Download the worksheet for Sound - Production and Propagation of Sound to practice offline. It includes additional chapter-level practice questions.

Characteristics of Sound Waves

Subtopic

Characteristics of Sound Waves under Sound for Grade 9 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    The unit s−1s^{-1} is equivalent to which of the following?

    A.

    Metre

    B.

    Hertz

    C.

    Pascal

    D.

    Newton

  2. 2.

    What is the frequency of a sound wave that has a time period of 0.1 seconds?

    A.

    1 Hz

    B.

    10 Hz

    C.

    100 Hz

    D.

    0.1 Hz

  3. 3.

    Which characteristic of sound is associated with the 'pleasantness' of the sound to the ear?

    A.

    Wavelength

    B.

    Speed

    C.

    Quality

    D.

    Pressure

Download the worksheet for Sound - Characteristics of Sound Waves to practice offline. It includes additional chapter-level practice questions.

Speed of Sound

Subtopic

Speed of Sound under Sound for Grade 9 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    The speed of sound in Methanol at 25∘C25^\circ\text{C} is:

    A.

    1103 m/s

    B.

    1207 m/s

    C.

    1531 m/s

    D.

    346 m/s

  2. 2.

    As sound waves move from water into air, the speed of sound:

    A.

    Increases

    B.

    Decreases

    C.

    Remains constant

    D.

    Doubles

  3. 3.

    The speed of sound in Glass (Flint) is approximately:

    A.

    3980 m/s

    B.

    1498 m/s

    C.

    346 m/s

    D.

    6420 m/s

Download the worksheet for Sound - Speed of Sound to practice offline. It includes additional chapter-level practice questions.

Reflection of Sound (Echo and Reverberation)

Subtopic

Reflection of Sound (Echo and Reverberation) under Sound for Grade 9 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    In the standard experimental setup to verify the laws of reflection of sound, a vertical screen or partition is placed between the two tubes (the source tube and the listener's tube). What is the primary reason for using this screen?

    A.

    To serve as the main surface for reflecting the sound waves

    B.

    To prevent the sound from the source reaching the listener directly through the air

    C.

    To increase the frequency and pitch of the sound as it travels through the tubes

    D.

    To ensure the sound waves travel at a constant speed regardless of the angle

  2. 2.

    Sound waves follow the law of reflection which states that the angle of incidence is _______ the angle of reflection.

    A.

    Greater than

    B.

    Less than

    C.

    Equal to

    D.

    Twice

  3. 3.

    If sound travels at 344 m/s344\text{ m/s} and an echo is heard after 2 s2\text{ s}, what is the distance of the obstacle?

    A.

    344 m344\text{ m}

    B.

    172 m172\text{ m}

    C.

    688 m688\text{ m}

    D.

    86 m86\text{ m}

Download the worksheet for Sound - Reflection of Sound (Echo and Reverberation) to practice offline. It includes additional chapter-level practice questions.

Range of Hearing and Ultrasound

Subtopic

Range of Hearing and Ultrasound under Sound for Grade 9 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Ultrasound waves are technically which type of waves?

    A.

    Transverse waves

    B.

    Electromagnetic waves

    C.

    Longitudinal waves

    D.

    Surface waves

  2. 2.

    The sound of a heartbeat can be visualized using ultrasound. This technique is specifically called:

    A.

    Electrocardiogram

    B.

    Echocardiogram

    C.

    Stethoscope exam

    D.

    Pulse check

  3. 3.

    Which of the following cannot be detected using SONAR?

    A.

    Sunken ships

    B.

    Underwater valleys

    C.

    Icebergs

    D.

    Clouds in the sky

Download the worksheet for Sound - Range of Hearing and Ultrasound to practice offline. It includes additional chapter-level practice questions.

Structure of Human Ear

Subtopic

Structure of Human Ear under Sound for Grade 9 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    The pressure variations in a longitudinal sound wave cause the ________ to move in and out.

    A.

    Pinna

    B.

    Eardrum

    C.

    Lens

    D.

    Skull

  2. 2.

    The process of hearing ends when the ________ interprets electrical signals.

    A.

    Inner ear

    B.

    Brain

    C.

    Spinal cord

    D.

    Mouth

  3. 3.

    The hammer is attached to the ________.

    A.

    Pinna

    B.

    Cochlea

    C.

    Eardrum

    D.

    Auditory nerve

Download the worksheet for Sound - Structure of Human Ear to practice offline. It includes additional chapter-level practice questions.

Sound - CBSE Class 9 Science Notes & Revision | Krit.club