# Physics Of Ultrasound! Trivia Questions And Facts Quiz

170 Questions | Total Attempts: 5461  Settings  Are you a medical student looking for a quiz to test out what you know about the Physics of ultrasound? If so then you are in luck as the quiz below is perfect for you as it is used by students preparing for their exams too. Do give it a try and see just how much you can remember.

• 1.
Which is not an acoustic variable?
• A.

Density

• B.

Pressure

• C.

Distance

• D.

Intensity

• 2.
All of the following are true EXCEPT:
• A.

Two waves with identical frequencies must interfere constructively

• B.

Constructive interference is associated with waves that are in phase

• C.

Out of phase waves interfere destructively

• D.

Waves of different frequencies may exhibit both contructive and destructive interference at different times

• 3.
Put in decreasing order
• A.

Deca

• B.

Deci

• C.

Micro

• D.

Centi

• 4.
Which of the following sound waves is ultrasonic and least useful in diagnostic imaging?
• A.

30 KHZ

• B.

8 MHz

• C.

8,000 Hz

• D.

3,000 kHz

• E.

15 Hz

• 5.
What is the frequency of a wave with 1msec period?
• A.

10,000 Hz

• B.

1,000 kHz

• C.

1kHz

• D.

1MHz

• 6.
If the frequency of an US wave is doubled, what happens to the period?
• A.

Doubles

• B.

Halved

• C.

Remains the same

• D.

4 times greater

• 7.
The units of pulse repetition frequency are:
• A.

Per minute

• B.

Msec

• C.

Mm/us

• D.

MHx

• 8.
The time from the beginning of a pulse until its end is__________?
• A.

Period

• B.

Pulse duration

• C.

Pulse length

• D.

PRF

• 9.
The time that a transducer is pulsing is measured at 18 seconds in one hour of total elapsed time.  What is the duty factor?
• A.

0.3

• B.

0.005

• C.

0.5Hz

• D.

0.005msec

• 10.
If a wave's amplitude is doubled, what happens to the power?
• A.

Nothing

• B.

Halved

• C.

Dpib;ed

• D.

• 11.
If the level of an acoustic variable ranges from 55 to 105, what is the amplitude?
• A.

105

• B.

50

• C.

25

• D.

55

• 12.
If the intensity of a sound beam remains unchanged while the beam area is reduced in half, what happened to the power?
• A.

• B.

Doubled

• C.

Halved

• D.

Unchanged

• 13.
Put these intensities in decreasing order
• A.

SATP

• B.

SPTP

• C.

SATA

• D.

SPTP, SATP, SATA

• E.

SPTP SATA, SATP

• 14.
The duty factor for continuous wave ultrasound is
• A.

10.0

• B.

1%

• C.

1.0

• D.

0.0%

• 15.
What is the minimum value of the SP/SA factor?
• A.

10.0

• B.

1%

• C.

1.0

• D.

0.0%

• 16.
Which pair of intensities has the same value for continuous wave US?
• A.

Spatial peak & spatial average

• B.

Temporal peak & spatial peak

• C.

Pulse average & temporal average

• D.

Spatial average & temporal average

• 17.
The fundamental frequency of a transcucer is 2.5 MHz.  What is the second harmonic frequency?
• A.

1.25 MHz

• B.

4.5 MHz

• C.

4.8 MHz

• D.

5 cm

• 18.
A pulse is emitted by a transducer and is traveling in soft tissue.  The go-return time, or time of flight, of a sound pulse is 130 microseconds.  What is the reflector depth?
• A.

10 cm

• B.

10 mm

• C.

10 m

• D.

130 mm

• E.

13 cm

• 19.
What is the approximate attenuation coefficient of 1MHz US in soft tissue?
• A.

0.5 dBcm

• B.

1cm

• C.

3dBcm

• D.

1dB

• 20.
The relaive output of an US instrument is calibrated in dB and the operator increases the output by 60 dB.  The beam intensity is increased by which of the following?
• A.

5%

• B.

Two times

• C.

Twenty times

• D.

One hundred times

• E.

One million times

• 21.
The more pixels per inch:
• A.

The better the temporal resolution

• B.

The better is the spatial resolution

• C.

• D.

The higher the reliability

• 22.
If we increase the transducer diameter, the beam diameter in the far zone is:
• A.

Increased

• B.

Decreased

• C.

Unchanges

• 23.
If the transducer diameter increases, the lateral resolution at its smallest dimension is
• A.

Increased

• B.

Decreased

• C.

Unchanged

• 24.
If we increase the frequency the near zone length is
• A.

Increased

• B.

Decreased

• C.

Unchanged

• 25.
If the frequency is decreased, the numerical value of the radial resolution is
• A.

Increased

• B.

Decreased

• C.

Unchanged

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