Free Practice Quiz Question List

9 Applied Biophysics in Medicine Online Quiz Questions

Use this free practice quiz with 20 questions to review 9 Applied Biophysics in Medicine, test your knowledge, and prepare for your next test or exam.

20 questions

Choose one

1 point

Two elastic implant materials experience the same small applied force. Material A has greater stiffness than Material B. Which material is expected to undergo the smaller displacement?

A
Material A, because its stiffness is greater.
B
Material B, because its stiffness is lower.
C
Both materials, because the applied force is the same.
D
Neither material, because a small force causes no deformation.

Fill in the blank

1 point

In ultrasound imaging, the travel time of an echo helps estimate the of a structure.

Choose all

1 point

Select all statements that accurately describe magnetic resonance imaging (MRI).

A
It combines strong magnetic fields and radiofrequency energy.
B
Signals from hydrogen nuclei vary with their molecular environment.
C
It forms images by using ionizing radiation.
D
It avoids ionizing radiation but has magnetic-field safety concerns.

Choose one

1 point

What does an electrocardiogram (ECG) primarily detect through electrodes placed on the skin?

A
The amount of heat transferred by the heart.
B
The pressure exerted by blood on vessel walls.
C
The heart’s changing electrical activity.
D
The speed of sound echoes returning from the heart.

Written response

1 point

A tissue sample absorbs $2$ J of radiation energy in a mass of $0.5$ kg. What is its absorbed dose in Gy? Enter the value in Gy; no tolerance is used.

True or false

1 point

True or false: A medical measurement can be treated as a diagnosis without considering motion, tissue variability, device settings, or measurement geometry.

A
True
B
False

Written response

1 point

What physical quantity does a ventilator apply to move air through the airways and expand the lungs? Enter one physical quantity.

True or false

1 point

True or false: Because MRI does not use ionizing radiation, patients do not need screening for device or implant compatibility.

A
True
B
False

Fill in the blank

1 point

For ideal laminar flow through a rigid cylindrical tube, Poiseuille’s relation makes resistance inversely proportional to the fourth power of the tube’s .

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1 point

In image-guided radiotherapy, which components can work together to direct treatment accurately? Select all correct choices.

A
Diagnostic images are used to locate a tumor.
B
Computational planning shapes the radiation beams.
C
The system relies only on a biological signal and needs no positioning.
D
Mechanical positioning aligns the patient and treatment device.

Choose one

1 point

Which description best explains how CT produces cross-sectional images?

A
It measures electrical potentials at the skin and converts them into slices.
B
It uses echoes from sound pulses to construct cross-sections.
C
It combines ionizing-radiation measurements from many directions to form cross-sectional images.
D
It uses magnetic fields to measure blood-flow pressure directly.

Open ended

1 point

A clinician needs real-time views of cardiac structures and wants to avoid ionizing radiation. Which imaging method is suitable, and what exposure-related caution should still be considered?

Choose one

1 point

Which sequence best describes how a wearable glucose monitor can turn a biochemical process into transmitted data?

A
A mechanical load moves a needle, and an imaging system records the motion.
B
A biochemical reaction generates a signal that an electronic sensor measures and transmits.
C
Radiofrequency energy stimulates the heart, and the resulting pulse is measured as glucose.
D
A magnetic field directly measures blood pressure and converts it into glucose.

Choose one

1 point

In ultrasound imaging, which statement correctly explains how echo travel time and echo strength contribute to an image?

A
Echo strength estimates depth, while echo travel time determines image brightness.
B
Echo travel time helps estimate depth, while echo strength contributes to image brightness.
C
Both echo travel time and echo strength estimate depth, but neither affects brightness.
D
Echo travel time measures blood velocity, while echo strength measures tissue temperature.

Choose one

1 point

Which statement best distinguishes the roles of an electrocardiogram (ECG) and a pacemaker?

A
An ECG stimulates the heart, while a pacemaker records its electrical activity.
B
Both devices only record electrical activity and do not affect the heart.
C
An ECG detects changing heart activity, while a pacemaker can deliver pulses to stimulate the heart.
D
An ECG measures blood flow, while a pacemaker measures tissue temperature.

Written response

1 point

What is the name of the unit used to measure absorbed radiation dose?

Choose one

1 point

How does CT produce cross-sectional image contrast?

A
Differences in tissue attenuation create contrast, and measurements from many directions are combined into cross-sectional images.
B
Echo travel times create contrast, and a single sound path produces a cross-sectional image.
C
Magnetic fields distinguish tissues, and radiofrequency energy alone creates the cross-sectional image.
D
Differences in tissue temperature create contrast, and measurements from one direction produce the image.

Choose one

1 point

Two elastic materials experience the same force within the small-deformation range. According to Hooke’s law, what happens to displacement in the material with greater stiffness?

A
The stiffer material undergoes a larger displacement because it resists the force more strongly.
B
The stiffer material undergoes a smaller displacement under the same force.
C
Both materials undergo the same displacement because the applied force is identical.
D
The stiffer material undergoes no displacement, regardless of the applied force.

True or false

1 point

MRI avoids ionizing radiation, but screening is still important because its magnetic and radiofrequency fields can create safety concerns for some implants and devices.

A
True
B
False

Written response

1 point

For ideal laminar flow through a rigid cylindrical tube, resistance varies as $R \propto r^{-4}$ . If the radius is reduced to $\frac{1}{2}$ of its original value, by what number is the resistance multiplied?