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Home » ARDMS QBank » ARDMS Ultrasound Physics & Instrumentation Practice Exam Part 2

ARDMS Ultrasound Physics & Instrumentation Practice Exam Part 2

June 2, 2015 By Rana Waqar Leave a Comment

26. Which of the following is defined as only the active time?*
- a. Duty factor
- b. Pulse repetition frequency
- c. Period
- d. Pulse duration
27. The inertia of the medium describes its:*
- a. Attenuation characteristics
- b. Stiffness
- c. Density
- d. Elasticity
28. Which of the following is determined by the sound source only?*
- a. Frequency
- b. Wavelength
- c. Spatial pulse length
- d. Propagation speed
29. The prefix “centi” denotes:*
- a. Thousandths
- b. Hundredths
- c. Millions
- d. Hundreds
30. If the angle of incidence is 40°, what is the angle of transmission at the interface if medium 1 has a propagation speed of 1320 m/s and medium 2 has a propagation speed of 1700 m/s?*
- a. <40°
- b. >40°
- c. 40°
- d. Cannot tell the angle of transmission
31. The change in the direction of the original sound wave that occurs when sound interacts with two different tissue types that have a different propagation speed is referred to as:*
- a. Wavelength
- b. Scattering
- c. Refraction
- d. Absorption
32. Which of the following is an appropriate unit of measurement for propagation speed?*
- a. millimeters per microsecond (mm/μs)
- b. watts per centimeter squared (W/cm²)
- c. microseconds (μs)
- d. kilohertz (kHz)
33. The major component of attenuation is:*
- a. Duty factor
- b. Pulse repetition frequency
- c. Period
- d. Pulse duration
34. In clinical imaging, the wavelength measures between:*
- a. 1 and 10 Hz
- b. 1540 and 2000 m/s
- c. 0 and 1
- d. 0.1 to 0.8 mm
35. The duty factor for continuous wave ultrasound is:*
- a. <99%
- b. 100%
- c. >20,000 Hz
- d. 8 Pa
36. All of the following relate to the strength of the sound wave except:*
- a. Amplitude
- b. Wavelength
- c. Intensity
- d. Power
37. What is the change in intensity if the power decreases by half?*
- a. Intensity doubles
- b. Intensity is halved
- c. Intensity is one fourth
- d. Intensity does not change
38. Damping of the sound beam:*
- a. Reduces the spatial pulse length
- b. Increases the spatial pulse length
- c. Increases the pulse duration
- d. Has no impact on spatial pulse length or pulse duration
39. What is defined as the ability of the ultrasound system to image structures that are positioned parallel to the sound beam as separate structures?*
- a. Transverse resolution
- b. Parallel resolution
- c. Axial resolution
- d. Coronal resolution
40. What is defined as the beginning of one pulse to the beginning of the next pulse, and therefore includes both the “on” and “off” time?*
- a. Pulse repetition period
- b. Pulse duration
- c. Duty factor
- d. Pulse repetition frequency
41. What is pressure measured in?*
- a. feet, inches, centimeters, or miles
- b. pascals or pounds per square inch
- c. kilograms per centimeter cubed
- d. hertz, kilohertz, or megahertz
42. What is essentially equal to the power of a wave divided by the area over which the power is distributed?*
- a. Amplitude
- b. Power
- c. Intensity
- d. Absorption
43. Transducers have material within them that, when electronically stimulated, produces ultrasound waves. This is most likely some form of:*
- a. Copperhirm titonize
- b. Zinconian sulfate
- c. Lead zirconate titanate
- d. Barium
44. What is the change in power if the amplitude triples?*
- a. It doubles
- b. It triples
- c. It quadruples
- d. It increases nine times
45. What is defined as the beginning of one pulse to the beginning of the next pulse, and therefore includes both the “on” and “off” time?*
- a. Compression
- b. Rarefaction
- c. Refraction
- d. Amplitude
46. If only the density of a medium is increased, then the:*
- a. Propagation speed will increase
- b. Propagation speed will decrease
- c. Propagation speed will stay the same
- d. None of the above
47. Sound is technically a:*
- a. Transverse and longitudinal wave
- b. Mechanical and transverse wave
- c. Nonmechanical and pressure wave
- d. Mechanical and longitudinal wave
48. The maximum value or minimum value of an acoustic variable minus the equilibrium value of that variable describes the:*
- a. Power
- b. Intensity
- c. Duty factor
- d. Amplitude
49. Which of the following would be considered ultrasonic?*
- a. 10 Hz
- b. 12.5 Hz
- c. 1 MHz
- d. 200 Hz
50. Which of the following is considered the speed of sound in soft tissue?*
- a. 660 m/s
- b. 330 m/s
- c. 1480 m/s
- d. 1540 m/s

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