About Oscillations and Waves

Oscillations and waves are all around us. In this blog post, we will discuss what oscillations and waves are, why they occur, and how we can use them to our advantage. Oscillations are a repeating back-and-forth motion, while waves involve the propagation of energy through a medium. Oscillations and waves have many applications in science and engineering, and can be used to transmit information or energy. We will explore some of these applications in this post!

So, what are oscillations and waves? Oscillations are a repeating motion in which an object moves back and forth about a fixed point. The most common type of oscillation is a pendulum, in which a mass is attached to a string and swings back and forth. Waves, on the other hand, involve the transfer of energy through a medium, such as air or water. Waves can be either transverse or longitudinal. Transverse waves are those in which the direction of the wave is perpendicular to the direction of travel.

One of the most important applications of oscillations and waves is in the field of communication. Oscillations are used to carry information through the air in the form of radio waves, and they are also used to carry information through optical fibers in the form of light waves.

Following are some of the multiple choice questions on the Oscillations and Waves with answers that will help the students in developing their knowledge.

Oscillations and Waves MCQ

1. Base on the formula above what is  ω and ϕω\ and\ ϕω and ϕ  stand for?

 x=xmcos⁡(ωt+ϕ)x=xm\cos(ωt+ϕ)x=xmcos(ωt+ϕ)  
  • ω is the angular frequency
  • ϕ is the phase constant
  • ω is the angular velocity
  • Both A & B

2. The aim of the above formula is to find?

 v=−ωxmsin⁡(ωt+ϕ)v=−ωxm\sin(ωt+ϕ)v=−ωxmsin(ωt+ϕ)  
  • displacement
  • velocity
  • acceleration
  • angular velocity

3. What is  xmxmxm in above equation stand for?

 x=xmcos⁡(ωt+ϕ)x=xm\cos(ωt+ϕ)x=xmcos(ωt+ϕ)  
  • amplitude of the distance
  • amplitude of the displacement
  • distance of the amplitude
  • velocity of the amplitude

4. What is κ and I stand for in the above formula?

 T=2πIκT=2π\sqrt{\frac{I}{κ}}T=2πκI​​  
  • I is the rotational inertia of the object about the axis of rotation
  • κ is the torsion constant of the wire
  • I is the rotational outer of the object about the axis of rotation
  • Both A & B

5. For the force acting on the block, the formula can now relate the spring constant k (a measure of the stiffness of the spring) to the mass of the block and the resulting angular frequency of what formula?

 F=−kxF=−kxF=−kx  
  •  k=mω2k=mω^2k=mω2  
  •  k=mvk=\frac{m}{v}k=vm​  
  •  k=ωmk=\frac{ω}{m}k=mω​  
  •  m=kωm=kωm=kω  

6. The aim of the above formula is to find?

 T=2πmkT=2π\sqrt{\frac{m}{k}}T=2πkm​​  
  • distance
  • period
  • acceleration
  • angular frequency

7. The aim of the above formula is to find?

 ω=kmω=\sqrt{\frac{k}{m}}ω=mk​​  
  • displacement
  • velocity
  • acceleration
  • angular frequency

8. The aim of the above formula is to find?

 x=xmcos⁡(ωt+ϕ)x=xm\cos(ωt+ϕ)x=xmcos(ωt+ϕ)  
  • distance
  • displacement
  • velocity
  • acceleration

9. The aim of the above formula is to find?

v=−ωxmsin(ωt+ϕ)
  • displacement
  • velocity
  • acceleration
  • angular velocity

10. Bunyi pantulan yang terjadi hampir bersamaan dengan bunyi asli dan terdengar saling bertumpuk disebut dengan . . . .

  • Gaung
  • Gema
  • Akustik
  • Feedback

11. Jovian screams near a canyon and can hear his echo 3 seconds later. If the speed of sound at that time is 300 m/s, what is the distance between Jovian and the canyon>

  • 900 m
  • 300 m
  • 150 m
  • 100 m

12. The example of animal that can hear the range of ultrasonic frequency are:

  • Bats
  • Dogs
  • Snakes
  • Both A & B

13. The range audiosonic frequency is . . . .

  • 20 - 2000 Hz
  • 10 - 10 000 Hz
  • 20 - 20 000 Hz
  • 20 - 10 000 Hz

14. The following are the properties of electromagnetic waves (light):

  • Can be reflected
  • Can be diffracted
  • Can be interferred
  • All of above

15. An imaginary line that is perpendicular to any surfaces is called . . . .

  • imaginary line
  • vertical line
  • normal line
  • straight line

16. The wave can propagate without any medium. It is the characteristic of these waves, except . . . .

  • Light
  • Electromagnetic wave
  • Infrared
  • Sound wave

17. A sound wave has a frequency of 50 Hz. If its wavelength is 3 m, calculate its wave speed.

  • 16.7 m/s
  • 60 m/s
  • 75 m/s
  • 150 m/s

18. Jason heard a thunder 2 seconds after he saw the lightning. If the speed of sound is 300 m/s, what is the distance between Jason and the lightning?

  • 600 m
  • 302 m
  • 300 m
  • 150 m

19. A violin string could vibrate with frequency of 1 kHz. The time period is . . . .

  • 1000 s
  • 10 s
  • 0.1 s
  • 0.001 s

20. There are two properties of sound waves, they are:

  • Pitch
  • Loudness
  • Vibration
  • Both A & B

21. A change of amplitude will change:

  • the wavelength
  • the loudness
  • the frequency
  • the pitch

22. Wave period means . . . .

  • the highest point above the rest position
  • the time taken for a full cycle of the wave
  • the maximum displacement of a point of a wave from its rest position
  • the number of waves passing a point each second

23. Calculate the time period of a wave with a frequency of 50 Hz.

  • 50 seconds
  • 5 seconds
  • 0.2 second
  • 0.02 second

24. A pendulum is observed to complete 30 full cycles in 120 seconds. Determine the period of the pendulum.

  • 90 seconds
  • 6 seconds
  • 4 seconds
  • 0.25 second

25. A pendulum has a time period of 0.4 s. What is its frequency?

  • 0.4 Hz
  • 1.0 Hz
  • 2.5 Hz
  • 4.0 Hz

26. A pendulum swings 5 times in a second. What is its frequency?

  • 0.2 s
  • 0.5 s
  • 1.0 s
  • 5.0 s

27. The following are the examples of transverse waves:

  • ripples on the surface of water
  • vibrations in a guitar string
  • seismic wave
  • Both A & B

28. The following are the characteristics of longitudinal waves:

  • the vibrations are parallel to the direction of wave travel
  • can propagate through solids, liquids, and gasses
  • consists of compressions and rarefactions
  • All of above

29. The maximum displacement of a point of a wave from its rest position or equilibrium point is called . . . .

  • Amplitude
  • Frequency
  • Crests
  • Period

30. The number of waves passing a point each second is . . . .

  • Period
  • Longitudinal waves
  • Frequency
  • Wavelength

31. Many oscillations are merely amusing or annoying, but many others are dangerous or financially important. pick the correct examples

  • When a bat hits a baseball
  • When the wind blows past a power line
  • When an airplane is in flight
  • All of above

32. Why when a bat hits a baseball and when the wind blows past a power line are the example of oscillation?

  • the line may oscillate (“gallop” in electrical engineering terms) so severely that it rips apart, shutting off the power supply to a community
  • When a bat hits a baseball, the bat may oscillate enough to sting the batter’s hands or even to break apart
  • When a bat hits a baseball, the bat may push through the batter’s hands or even break apart and become one
  • Both A & B

33. A particle in simple harmonic motion has, at any time, kinetic energy and potential energy of what formula?

  • K=12mv2K=\frac{1}{2}mv^2K=21​mv2
  • U=12kx2U=\frac{1}{2}kx^2U=21​kx2
  • U=12kxU=\frac{1}{2}kx^{ }U=21​kx
  • Both A & B

34. If no friction is present, the mechanical energy remains constant even though what variable changes?

  • K
  • U
  • E
  • Both A & B

35. For small-angle oscillations of a simple pendulum, relate the period T (or frequency f) to what variable?

  • to the pendulum’s length L
  • to the distance h between the pivot and the center of mass
  • the angular position θ and rate
  • Both A & B

36. The study and control of oscillations are two of the primary goals of what?

  • physics
  • engineering
  • biology
  • Both A & B

37. Explain the statement of An oscillator produces an oscillatory disturbance that moves through the surrounding medium

  • If the oscillator is a mechanical oscillator and if it is placed in liquid like water, it produces waves that travel in a liquid medium
  • If the oscillator is an electronic circuit, then electromagnetic waves are produced and transmitted to surrounding air/vacuum through inductance coils or antenna
  • If the oscillator is an electronic circuit, then electromagnetic waves fail to develop
  • Both A & B

38. The value of  xmxmxm   determines how far the particle moves in its oscillations and is called the amplitude of what?

  •  oscillations
  • simple harmonic motion
  •  freeze-frames
  • velocity

39. In simple harmonic motion (SHM), the displacement x(t) of a particle from its equilibrium position is described by the equation of?

  • x = xm cos(ωt - 2ϕ)
  • x = xm cos(ωt + 2ϕ)
  • x = xm cos(ωt + ϕ)
  • x = xm cos(2ωt + ϕ)

40. The period T is the time required for one complete oscillation or cycle, It is related to the frequency by?

  • T=2/F
  • T=1/F
  • T=3/F
  • T=4/F

41. 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

42. Sound is an example of a

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

43. 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

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

  • frequency
  • period
  • longitudinal
  • transverse wave

45. 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

46. 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

47. 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

48. 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

49. Which material does sound travel the fastest?

  • solid
  • liquid
  • gases
  • None of these

50. 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

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