Question 1

All the following are true of electromagnetic radiation except they:

Accepted Answer

A) are composed of photons that travel through space in waveforms. 
B) travel at various speeds. 
C) differ only by their wavelength. 
D) travel in straight lines. 
A) are composed of photons that travel through space in waveforms. 
B) travel at various speeds. 
C) differ only by their wavelength. 
D) travel in straight lines.

Question 2

The term _____ is used to describe areas that appear dark on the image; _____ is the term used to describe areas that appear white or light gray.

Accepted Answer

A) radiopaque; radiolucent 
B) radiolucent; radiopaque 
C) density; contrast 
D) contrast; density 
A) radiopaque; radiolucent 
B) radiolucent; radiopaque 
C) density; contrast 
D) contrast; density

Question 3

A lead apron and a thyroid collar:

Accepted Answer

A) are used for a full-mouth series of films but are not necessary for single periapical films. 
B) must be used on all patients for all exposures. 
C) are required for pediatric patients but is optional for adults. 
D) are mandated only for pregnant women. 
A) are used for a full-mouth series of films but are not necessary for single periapical films. 
B) must be used on all patients for all exposures. 
C) are required for pediatric patients but is optional for adults. 
D) are mandated only for pregnant women.

Question 4

How well the image reproduces fine detail or distinct outlines of an object is called:

Accepted Answer

A) sharpness. 
B) magnification. 
C) density. 
D) contrast. 
A) sharpness. 
B) magnification. 
C) density. 
D) contrast.

Question 5

Thermionic emission refers to the:

Accepted Answer

A) release of electrons from the tungsten filament. 
B) ions formed in the x-ray tube by the loss of electrons. 
C) change in filament resistance due to heating. 
D) slamming of electrons against the target. 
A) release of electrons from the tungsten filament. 
B) ions formed in the x-ray tube by the loss of electrons. 
C) change in filament resistance due to heating. 
D) slamming of electrons against the target.

Question 6

The Guidelines for Prescribing Dental Radiographs issued by the American Dental Association and the FDA recommend which of the following dental imaging procedures for a pregnant patient?

Accepted Answer

A) Do not take images of a pregnant patient. 
B) Radiographic imaging procedures do not need to be altered because of pregnancy. 
C) Take images only after the first trimester. 
A) Do not take images of a pregnant patient. 
B) Radiographic imaging procedures do not need to be altered because of pregnancy. 
C) Take images only after the first trimester.

Question 7

In dentistry,the _____ the wavelengths of the x-rays,the greater their energy and their usefulness.

Accepted Answer

A) shorter 
B) longer 
C) more ionized 
D) straighter 
A) shorter 
B) longer 
C) more ionized 
D) straighter

Question 8

Which of the following is less sensitive to x-rays and therefore not considered a critical organ?

Accepted Answer

A) Skin 
B) Muscle 
C) Thyroid gland 
D) Lens of the eye 
A) Skin 
B) Muscle 
C) Thyroid gland 
D) Lens of the eye

Question 9

The maximum permissible dose for an occupational worker for an individual 18 years of age or older is _____ rem/year.

Accepted Answer

A) 3 
B) 5 
C) 1.25 
D) 0.3 
A) 3 
B) 5 
C) 1.25 
D) 0.3

Question 10

If you change the exposure time of the x-ray unit,what is affected?

Accepted Answer

A) Energy of the beam 
B) Wavelength of the x-rays 
C) Number of x-rays produced 
D) Penetrability of the x-rays 
A) Energy of the beam 
B) Wavelength of the x-rays 
C) Number of x-rays produced 
D) Penetrability of the x-rays

Question 11

When the electrons slam against the target,_______ are generated.

Accepted Answer

A) 99% heat and 1% x-rays 
B) 1% heat and 99% x-rays 
C) 50% x-rays and 50% heat 
D) only x-rays 
A) 99% heat and 1% x-rays 
B) 1% heat and 99% x-rays 
C) 50% x-rays and 50% heat 
D) only x-rays

Question 12

The sharpness of a radiographic image can be improved by:

Accepted Answer

A) a larger focal spot size. 
B) faster speed film. 
C) smaller film crystal size. 
D) movement of the patient. 
A) a larger focal spot size. 
B) faster speed film. 
C) smaller film crystal size. 
D) movement of the patient.

Question 13

When the master switch is on:

Accepted Answer

A) x-rays are being produced. 
B) the red emission light will illuminate. 
C) the electron cloud is emitted. 
D) all of the above. 
A) x-rays are being produced. 
B) the red emission light will illuminate. 
C) the electron cloud is emitted. 
D) all of the above.

Question 14

If a patient is small and petite,to get the same density radiograph it is best to reduce the:

Accepted Answer

A) exposure time. 
B) mA. 
C) kVp. 
D) exposure time and mA. 
A) exposure time. 
B) mA. 
C) kVp. 
D) exposure time and mA.

Question 15

The x-ray was discovered on November 8,1895,by:

Accepted Answer

A) John Greenwood. 
B) Wilhelm Conrad Roentgen. 
C) Edmund Kells. 
D) G.V. Black. 
A) John Greenwood. 
B) Wilhelm Conrad Roentgen. 
C) Edmund Kells. 
D) G.V. Black.

Question 16

When in storage,the lead apron should be:

Accepted Answer

A) hung. 
B) folded. 
C) draped over a bar. 
D) both a and c 
A) hung. 
B) folded. 
C) draped over a bar. 
D) both a and c

Question 17

The degree of density or blackness on an image is controlled by the:

Accepted Answer

A) low-voltage circuit. 
B) kilovoltage. 
C) milliampere seconds. 
D) position indicating device. 
A) low-voltage circuit. 
B) kilovoltage. 
C) milliampere seconds. 
D) position indicating device.

Question 18

The lead collimator is used to:

Accepted Answer

A) make the primary beam more accurate 
B) restrict the size and shape of the primary beam. 
C) remove long wavelengths. 
D) stop production of the primary beam. 
A) make the primary beam more accurate 
B) restrict the size and shape of the primary beam. 
C) remove long wavelengths. 
D) stop production of the primary beam.

Question 19

A(n)_____ is a minute bundle of energy that has no weight or mass.

Accepted Answer

A) ion 
B) atom 
C) photon 
D) electron 
A) ion 
B) atom 
C) photon 
D) electron

Question 20

The range of shades of gray between black and white on an image is called:

Accepted Answer

A) contrast. 
B) density. 
C) sharpness. 
D) focus point. 
A) contrast. 
B) density. 
C) sharpness. 
D) focus point.

Exam 38: Foundations of Radiography, Radiographic Equipment, and Radiation Safety

All the following are true of electromagnetic radiation except they:

The term _____ is used to describe areas that appear dark on the image; _____ is the term used to describe areas that appear white or light gray.

A lead apron and a thyroid collar:

How well the image reproduces fine detail or distinct outlines of an object is called:

Thermionic emission refers to the:

The Guidelines for Prescribing Dental Radiographs issued by the American Dental Association and the FDA recommend which of the following dental imaging procedures for a pregnant patient?

In dentistry,the _____ the wavelengths of the x-rays,the greater their energy and their usefulness.

Which of the following is less sensitive to x-rays and therefore not considered a critical organ?

The maximum permissible dose for an occupational worker for an individual 18 years of age or older is _____ rem/year.

If you change the exposure time of the x-ray unit,what is affected?

When the electrons slam against the target,_______ are generated.

The sharpness of a radiographic image can be improved by:

When the master switch is on:

If a patient is small and petite,to get the same density radiograph it is best to reduce the:

The x-ray was discovered on November 8,1895,by:

When in storage,the lead apron should be:

The degree of density or blackness on an image is controlled by the:

The lead collimator is used to:

A(n)_____ is a minute bundle of energy that has no weight or mass.

The range of shades of gray between black and white on an image is called:

History of Dentistry

The Professional Dental Assistant

The Dental Healthcare Team

Dental Ethics

Dentistry and the Law

General Anatomy

General Physiology

Oral Embryology and Histology

Head and Neck Anatomy

Landmarks of the Face and Oral Cavity

Overview of the Dentitions

Tooth Morphology

Dental Caries

Periodontal Disease

Preventive Dentistry

Nutrition

Oral Pathology

Microbiology

Disease Transmission and Infection Prevention

Principles and Techniques of Disinfection

Principles and Techniques of Instrument Processing and Sterilization

Regulatory and Advisory Agencies

Chemical and Waste Management

Dental Unit Waterlines

Ergonomics

The Patient Record

Vital Signs

Oral Diagnosis and Treatment Planning

The Special Needs and Medically Compromised Patient

Principles of Pharmacology

Assisting in a Medical Emergency

The Dental Office

Delivering Dental Care

Dental Hand Instruments

Dental Handpieces and Accessories

Moisture Control

Anesthesia and Pain Control

Digital Imaging, Dental Film, and Processing Radiographs

Legal Issues, Quality Assurance, and Infection Prevention

Intraoral Imaging

Extraoral Imaging

Restorative and Esthetic Dental Materials

Dental Liners, Bases, and Bonding Systems

Dental Cements

Impression Materials

Laboratory Materials and Procedures

General Dentistry

Matrix Systems for Restorative Dentistry

Fixed Prosthodontics

Provisional Coverage

Removable Prosthodontics

Dental Implants

Endodontics

Periodontics

Oral and Maxillofacial Surgery

Pediatric Dentistry

Coronal Polishing

Dental Sealants

Orthodontics

The term _ is used to describe areas that appear dark on the image; _ is the term used to describe areas that appear white or light gray.