Physics - Class X - Chapter No.12 - Questions And Answers

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WAVES AND SOUND

IMPORTANT QUESTIONS OF PAST PAPERS:

1)  Define Wavelength, Frequency and Velocity of a wave and derive the equation V = fλ (2009) OR
    ◾ Prove that V = fλ (2011, 2014)
2)  Define Simple Harmonic Motion and verify it with the help of a simple pendulum. (2009) OR
     ◾ Define Simple Harmonic Motion and prove that  the motion of a simple pendulum is simple harmonic motion. (2018) OR

     ◾ Define Simple Harmonic Motion and prove that  the motion of a body attached to the end of spring execute simple harmonic motion. (2019) 
3)  State three characteristics of musical sound and describe any one of them (2009) OR
     ◾  Define musical sound and write its three characteristics. (2017)

4)  The sound of thunder in the sky heard later than the streak of flight although they are produced at the same time (Give scientific reasons) (2009)
5)  Define the following terms:
    (i)Echo  (2010, 2012)
    (ii) Ultrasonic waves   (2010)
    (iii) Beats  (2010, 2016 )

    (iv) Simple harmonic motion (2012)
    (v)  Frequency (2012, 2017)
    (vi) Time period (2012, 2017)
    (vii) Pitch. (2012)
    (viii) Resonance (2014)
    (ix) Stationary waves (2016)
    (x)  Interference (2016)
    (xi) Wavelength (2017)
6)  Write down two characteristics  properties of simple harmonic motion? (2010)
7)  Define loudness of sound? Write three factors on which the loudness of sound
depends? (2012)
8)  Write down three/ two differences between transverse and longitudinal waves. (2014, 2016)
9)  Define Simple Harmonic Motion and describe its five important terms.(2015)

Numerical:
1)   The frequency if vibration of a wire is 200 hertz; find its time period. (2010) (Hint: Formula ; T = ¹ / _{f )}
2)  A Sitar string vibrates at 400 Hz. What is the time period of this vibration? (2011)   ( Hint: Formula ; T = ¹ / _{f )}

3)  Calculate the length of a second's pendulum (g = 10 ms^-2) (2013)  ( Hint: Formula ; T=  2 𝞹 √   l/ g ) OR
    ◾ Calculate the length of a second's pendulum  - Taking 'g' equal to 10 ms^-2.  (Second's pendulum has a time period of 2 second) (2017)  ( Hint: Formula ; T=  2 𝞹 √   l/ g )
4)  20 waves per second pass through a point on the surface of the pond. Calculate the wavelength if the velocity of waves is the 3.5 ms-1. (2014)  ( Hint: Formula ;  f = No.of waves / time)
5)  Find the time period of simple pendulum whose length is 100 cm. (2015) ( Hint: Formula ; T=  2 𝞹 √    l/ g )
6)   Find the time period of simple pendulum whose length is 288 cm. (2016) ( Hint: Formula ; T=  2 𝞹 √   l/ g )
7)   A piece of paper completes 600 vibrations in 60 seconds when some waves pass through the surface of water. Find the time period and the frequency of the piece of paper. Calculate the wavelength if the velocity of the waves is 2.S m/s.(2018) ( Hint: Formula ;  f = number of vibration / time,  T = ¹ / _f  ,  and  𝓥 = f𝝺 )
8) When a sound wave of frequency 200 Hertz and wave length 300 cm passes through a medium. Calculate the velocity of the wave in the medium. (Hint: Formula 𝓥 = f𝝺 )(2019)

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