DMS SPI Mock Exam Questions And
Answers
Which of the following acoustic variables will change due to sound
travel through a medium? -
correct answer ✅Pressure
How does a boundary with a very large impedance mismatch
appear? -
correct answer ✅Boundary will be very echogenic
If the incident beam strikes a boundary at an angle of 35° what
would be the angle of reflection? -
correct answer ✅35°
If the frequency of a wave is 5MHz and the wavelength is 5µ,
calculate the propagation velocity. -
correct answer ✅25m/s
What is the frequency of a wave that has four episodes of
compression and rarefaction occurring over 2 seconds in time? -
correct answer ✅2Hz
,DMS SPI Mock Exam Questions And
Answers
What is the half-intensity depth for a 10MHz transducer in soft
tissue? -
correct answer ✅0.6cm
What range of frequencies would be considered for diagnostic
ultrasound? -
correct answer ✅4 to 10MHz
What is the accepted propagation velocity of soft tissue? -
correct answer ✅1540m/s
What transducer will result in the greatest total attenuation? -
correct answer ✅12MHz
If the power of a wave is increased by a factor of 10, what happens
to the intensity of the wave? -
correct answer ✅It increases by a factor of 10
Calculate duty factor for a system with a pulse length of 5 cycles, a
period of 2ms, and a dead time of 10ms. -
correct answer ✅50%
,DMS SPI Mock Exam Questions And
Answers
What best describes direction of motion of the particles in a sound
wave? -
correct answer ✅Particle motion is parallel to the direction in
which the waves are traveling
If two mediums have the same stiffness, which will have the greater
propagation velocity? -
correct answer ✅The medium with the lower density
If the period of a wave is increased by a factor of 2, what happens
to the propagation velocity -
correct answer ✅Propagation velocity remains unchanged
If the power of a wave remains unchanged but the area is increased
by a factor of 2, what happens to the intensity? -
correct answer ✅Intensity is decreased by a factor of 2
What best equates to the value 7,500,000Hz? -
correct answer ✅7.5MHz
, DMS SPI Mock Exam Questions And
Answers
Why do higher frequency transducers have better axial resolution? -
correct answer ✅Higher frequency transducers have a shorter
wavelength which equates to a shorter spatial pulse length (SPL)
What is the definition of a period? -
correct answer ✅The time taken for a cycle to occur
What does "a transducers inability to recognize the depth of origin
of a return soundwave due to inadequate time delay between
transmit pulses" best describe? -
correct answer ✅Depth ambiguity
What steps will most likely cause the sonographer to miss
something changing quickly in time? -
correct answer ✅The use of five focal zones
What crystal will produce the highest pulsed-wave frequency
pulse? -
correct answer ✅2mm thickness
(thinnest) -
correct answer ✅
Answers
Which of the following acoustic variables will change due to sound
travel through a medium? -
correct answer ✅Pressure
How does a boundary with a very large impedance mismatch
appear? -
correct answer ✅Boundary will be very echogenic
If the incident beam strikes a boundary at an angle of 35° what
would be the angle of reflection? -
correct answer ✅35°
If the frequency of a wave is 5MHz and the wavelength is 5µ,
calculate the propagation velocity. -
correct answer ✅25m/s
What is the frequency of a wave that has four episodes of
compression and rarefaction occurring over 2 seconds in time? -
correct answer ✅2Hz
,DMS SPI Mock Exam Questions And
Answers
What is the half-intensity depth for a 10MHz transducer in soft
tissue? -
correct answer ✅0.6cm
What range of frequencies would be considered for diagnostic
ultrasound? -
correct answer ✅4 to 10MHz
What is the accepted propagation velocity of soft tissue? -
correct answer ✅1540m/s
What transducer will result in the greatest total attenuation? -
correct answer ✅12MHz
If the power of a wave is increased by a factor of 10, what happens
to the intensity of the wave? -
correct answer ✅It increases by a factor of 10
Calculate duty factor for a system with a pulse length of 5 cycles, a
period of 2ms, and a dead time of 10ms. -
correct answer ✅50%
,DMS SPI Mock Exam Questions And
Answers
What best describes direction of motion of the particles in a sound
wave? -
correct answer ✅Particle motion is parallel to the direction in
which the waves are traveling
If two mediums have the same stiffness, which will have the greater
propagation velocity? -
correct answer ✅The medium with the lower density
If the period of a wave is increased by a factor of 2, what happens
to the propagation velocity -
correct answer ✅Propagation velocity remains unchanged
If the power of a wave remains unchanged but the area is increased
by a factor of 2, what happens to the intensity? -
correct answer ✅Intensity is decreased by a factor of 2
What best equates to the value 7,500,000Hz? -
correct answer ✅7.5MHz
, DMS SPI Mock Exam Questions And
Answers
Why do higher frequency transducers have better axial resolution? -
correct answer ✅Higher frequency transducers have a shorter
wavelength which equates to a shorter spatial pulse length (SPL)
What is the definition of a period? -
correct answer ✅The time taken for a cycle to occur
What does "a transducers inability to recognize the depth of origin
of a return soundwave due to inadequate time delay between
transmit pulses" best describe? -
correct answer ✅Depth ambiguity
What steps will most likely cause the sonographer to miss
something changing quickly in time? -
correct answer ✅The use of five focal zones
What crystal will produce the highest pulsed-wave frequency
pulse? -
correct answer ✅2mm thickness
(thinnest) -
correct answer ✅
