Quiz  /  Oscillations and Waves Class 11 MCQ Questions With Answers

  • 1. 
    A person is standing still and listening to a siren sounding an alarm. The frequency of the sound is 500 Hz. The person begins running toward the sound at a rate of 20 m/s. The frequency of the sound the person hears will

  • decrease
  • remain the same
  • increase
  • change by 20 Hz.

  • 2. 
    The lowest pitch the average human can hear is about 20.0 Hz. If sound with this frequency travels through air about 300 m/s, What is its wavelength?

  • 15
  • 6000 m
  • 15 m
  • 6000

  • 3. 
    An object is attached to a vertical spring and bobs up and down between points A and B.  Where is the object located when its kinetic energy is a maximum?

  • at either A or B
  • midway between A and B
  • one-third of the way between A and B
  • one-fourth of the way between A and B

  • 4. 
    Sound is an example of a

  • transverse wave
  • longitudinal wave
  • focal wave
  • electromagnetic wave

  • 5. 
    A student holds two vibrating objects. Object A is vibrating faster than object B. Which statement is true?

  • A is louder than B
  • B is louder than A
  • A will have a higher pitch than B
  • B will have a higher pitch than A

  • 6. 
    An ideal spring with a constant of 200 N/m is acted upon by a 500 N force directed in the positive direction.  What is the magnitude and direction of the displacement?

  • 0.4 m
  • -0.4 m
  • 2.5 m
  • -2.5 m

  • 7. 
    A(n) _____ is a good mathematical model for representing transverse waves.

  • tangent curve
  • exponential curve
  • parabolic curve
  • sine curve

  • 8. 
    An object attached to one end of a spring makes 20 complete vibrations in 10s. Its period is:

  • 0.50 s
  • 2 s
  • 0.5 Hz
  • 2 Hz

  • 9. 
    Which position shows the spring with maximum gravitational potential energy?

  • A
  • B
  • C
  • D

  • 10. 
    Which material does sound travel the fastest?

  • solid
  • liquid
  • gases

  • 11. 
    What is common with all electromagnetic and mechanical waves?

  • They travel at the same speed
  • They transfer energy
  • They are all longitudinal waves
  • They are all transverse waves

  • 12. 
    A pair of trapeze performers at the circus is swinging from ropes attached to a large elevated platform. Suppose that the performers can be treated as a simple pendulum with a length of 16 m. Determine the period for one complete back and forth cycle.

  • 2 sec
  • 12 sec
  • 8 sec
  • 10 sec

  • 13. 
    An ornament of mass 40.0 g is attached to a vertical ideal spring with a force constant (spring constant) of 20.0 N/m. The ornament is then lowered very slowly until the spring stops stretching. How much does the spring stretch?

  • 0.00200 m
  • 0.0196 m
  • 0.0816 m
  • 0.800 m

  • 14. 
    A student in a band notices that a drum vibrates when another instrument emits a certain frequency note. This phenomenon illustrates

  • reflection
  • refraction
  • resonance
  • doppler effect

  • 15. 
    The number of wavelengths that pass a point each per second is:

  • frequency
  • period
  • longitudinal
  • transverse wave

  • 16. 
    A truck with bad shock absorbers bounces up and down after hitting a bump. The truck has a mass of 1700 kg and is supported by four springs, each having a spring constant of 6200 N/m. What is the period for each spring?

  • 0.26 sec
  • 1.645 sec
  • 0.26 hz
  • 1.645 hz

  • 17. 
    An object attached to an ideal spring executes simple harmonic motion. If you want to double its total energy, you could

  • double the amplitude of vibration
  • double the force constant (spring constant) of the spring
  • double both the amplitude and force constant (spring constant).
  • double the mass

  • 18. 
    The speed of a sound wave...

  • depends on amplitude
  • depends on the medium
  • depends on wavelength
  • none of the above
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