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Physics Grade 9 Unit 6: Mechanical Oscillation and Sound Wave

national exam questions have come from this unit. It runs 26 pages; one careful study pass takes about 2.8 hours, and its difficulty is easier among Physics units. Each section below lists the questions set from it, with the year, and opens the page that teaches it.

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6.1 Common Characteristics of Waves · read p. 120
  • 2018 E.C., Q17 – Which one of the following statements correctly defines the characteristic feature of a mechanical waves?
  • 2015 E.C., Q23 – Which one of the following is correct about mechanical waves?
  • 2011 E.C., Q28 – Travelling wave is given by the equation , where is the wave number and is the angular frequency. What is the distance that the wave travels in the time ?
  • 2007 E.C., Q27 – A given minimum point (trough) of a sinusoidal wave is traveling 480 cm long a rope in 12s. If the oscillator that generates the wave completes 48 vibrations in 30s, what is the wave length of the wave?
6.2 String, Pendulum and Spring · read p. 122
  • 2015 E.C., Q49 – An object of mass M is attached to a spring of spring constant K, as shown in the figure below. If the mass is pulled to a point P, which is at distance A from equilibrium position O, and released, Which one of the follo
  • 2011 E.C., Q27 – Which one of the following is not an example of simple harmonic motion?
  • 2010 E.C., Q31 – What makes the oscillatory motion a simple harmonic motion?
  • 2008 E.C., Q20 – A simple pendulum is made using a long thin metal wire. What happens to the period of the pendulum when the temperature drops?
  • 2007 E.C., Q26 – The position of a particle moving with simple harmonic motion is given by an expression , where A is the amplitude of the oscillatioin, t is time, is angular frequency, and is the phase constant. If , what will be the si
  • 2006 E.C., Q26 – An object of mass $m$ is hung from a spring and set into oscillation. The frequency of the oscillation is measured and recorded as $f$. if the object of mass $m$ is replaced with an object of mass $m$ is replaced with an
  • 2006 E.C., Q48 – A block of mass 1.6kg is attached to a horizontal spring that has a force constant of 200N/m. The spring is compressed 2.0cm and is then released from rest. At what speed will the block pass through the equilibrium posit
6.3 Propagation of Waves and Energy Transmission · read p. 129
Not asked in a national paper yet.
6.4 Sound Waves · read p. 131
  • 2018 E.C., Q18 – The speed of sound is greatest in which one of the following materials?
  • 2017 E.C., Q32 – Which one of the following statements is correct about the speed of sound in different medium? The speed of sound
  • 2017 E.C., Q3 – Which one of the following statements is correct about transverse and longitudinal waves?
  • 2016 E.C., Q2 – Which one of the following waves is an example of longitudinal waves in material medium?
  • 2014 E.C., Q17 – Which of the following statements is NOT correct about reflection and refraction of sound waves and their applications?
  • 2012 E.C., Q18 – Huygens's principle states that
  • 2012 E.C., Q17 – Which of the following is correct about Doppler effect?
6.5 Superposition of Waves · read p. 137
Not asked in a national paper yet.
6.6 Characteristics of Sound Waves · read p. 138
Not asked in a national paper yet.