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Question 1
In propagation terms, tissue is often described as which of the following?
Correct Answer:
Medium
Explanation:
In propagation terms, tissue is described as a medium—the material through which ultrasound waves travel. Thinking of tissue as a medium is what lets us discuss how sound speed, attenuation, and impedance depend on the tissue’s properties, and how those properties shape echo formation and image generation. Dense connective tissue and soft tissue are histologic labels describing composition, not the propagation descriptor used in ultrasound physics. Tissue matrix isn’t a standard term for how waves propagate through the body. So the best description is medium, because it conveys the concept of a material through which sound moves and interacts.
Question 2
What units are used to express pressure in acoustics and ultrasound?
Correct Answer:
Newtons
Explanation:
Pressure is force per unit area, so its SI unit is the pascal, defined as one newton per square meter. In acoustics and ultrasound, we describe sound pressure using pascals (often kilopascals) and, for levels, in decibels relative to 20 micropascals. Newtons measure force, joules measure energy, and meters measure length, so they don’t express pressure. Thus, pascals are the correct units for pressure in this field.
Question 3
Which statement about a reciprocal relationship is true?
Correct Answer:
The product of a number and its reciprocal is one
Explanation:
A reciprocal is the multiplicative inverse of a number: for a nonzero number x, its reciprocal is 1/x, and x multiplied by 1/x equals 1. This is why the true statement is that the product of a number and its reciprocal is one. Remember that zero has no reciprocal, so this rule doesn’t apply to zero. Some other ideas aren’t generally true: the product is not typically greater than one (it's always exactly one for any nonzero number), subtracting a number and its reciprocal doesn’t guaranteed yield zero, and reciprocals aren’t equal to the original number except in special cases like 1 or -1.
Question 4
How many centimeters are in 1 meter?
Correct Answer:
100
Explanation:
In metric length, a centimeter is one hundredth of a meter, so there are 100 centimeters in a meter. 1 meter equals 1 × 100 centimeters, which is 100 cm. A quick check: 100 pieces of 1 cm laid end to end span 1 meter. The other options correspond to different lengths—10 cm is 0.1 m, 1000 cm is 10 m, and 0.1 m is 10 cm—so 100 cm is the correct amount in one meter.
Question 5
Two waves can have identical PRF's, even if their frequencies are different.
Correct Answer:
True
Explanation:
Pulse repetition frequency is the number of pulses sent per second, not the frequency of the ultrasound wave itself. PRF is determined by how long echoes take to return from the farthest imaging depth and by the listening time after each pulse. Because this timing depends on depth and pulse timing, not on the carrier frequency of the transmitted wave, you can have waves with different frequencies being pulsed at the same rate. A high-frequency wave and a low-frequency wave can both be emitted at the same PRF, while their carrier frequencies—affecting resolution and attenuation—remain different.
Question 1
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About this Exam

Prepare with the Diagnostic Medical Sonography (DMS) Practice Exam practice quiz. This question bank includes 10 questions covering sound, propagation, terms, diagnostic, and medical. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Diagnostic Medical Sonography (DMS) Practice Exam

This practice set contains 10 questions from the matching question bank and focuses on sound, propagation, terms, diagnostic, and medical. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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