Quiz  /  Oscillations and Waves Class 12 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. 
    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

  • 3. 
    Sound is an example of a

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

  • 4. 
    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

  • 5. 
    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

  • 6. 
    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

  • 7. 
    Which position shows the spring with maximum gravitational potential energy?

  • A
  • B
  • C
  • D

  • 8. 
    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

  • 9. 
    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

  • 10. 
    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

  • 11. 
    The number of wavelengths that pass a point each per second is:

  • frequency
  • period
  • longitudinal
  • transverse wave

  • 12. 
    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

  • 13. 
    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

  • 14. 
    The speed of a sound wave...

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

  • 15. 
    Sound waves

  • Are electromagnetic
  • Are longitudinal
  • Can not be reflected
  • Can travel through a vacuum

  • 16. 
    Electromagnetic waves are produced by

  • static charge
  • An accelerated charge
  • moving charge
  • Charged particles

  • 17. 
    A real LC circuit

  • Has zero resistance
  • Has zero current
  • Has a natural frequency
  • Requires forced oscillations to work

  • 18. 
    Which of the following has maximum penetrating power?

  • Ultraviolet radiation
  • Microwaves
  • γ-rays
  • Radio waves

  • 19. 
    Frequency

  • Is how fast something goes
  • Is opposite to wavelength
  • = wave speed x wave length
  • Is measured in cycles per unit time

  • 20. 
    Waves in decreasing order of their wavelength are

  • X-rays, infrared rays, visible rays, radio waves
  • radio waves, visible rays, infrared rays, X-rays.
  • radio waves, infrared rays, visible rays, X-rays.
  • radio waves, ultraviolet rays, visible rays, X-rays.

  • 21. 
    Which of the following has minimum wavelength?

  • Blue light
  • γ-rays
  • infrared rays
  • microwave

  • 22. 
    In electromagnetic waves the phase difference between electric field vector and magnetic field vector is

  • zero
  • π/2
  • π
  • π/3

  • 23. 
    Electromagnetic waves are transverse in nature is evident by

  • reflection
  • interference
  • polarisation
  • diffraction

  • 24. 
    Which of the following rays are not electromagnetic waves?

  • Gamma rays
  • Beta rays
  • Heat rays
  • X rays

  • 25. 
    Which of the following is called heat radiation?

  • X-rays
  • Gamma rays
  • Microwave
  • Infrared radiation
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