Question 1

If the operator's film badge indicates an exposure to small amounts of radiation,what should be done?

Accepted Answer

A) Consult a physician. 
B) Ignore the report. 
C) Evaluate the x-ray equipment and techniques. 
D) Change the mA and kVp. 
A) Consult a physician. 
B) Ignore the report. 
C) Evaluate the x-ray equipment and techniques. 
D) Change the mA and kVp. C

Question 2

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. C

Question 3

Which of the following structures will appear radiopaque on dental x-ray film?

Accepted Answer

A) Metal restorations 
B) Soft tissue 
C) Tooth decay 
D) Dental pulp 
A) Metal restorations 
B) Soft tissue 
C) Tooth decay 
D) Dental pulp A

Question 4

One of the earliest signs of overexposure to x-rays may be:

Accepted Answer

A) keratosis. 
B) loss of hair. 
C) erythema. 
D) blindness. 
A) keratosis. 
B) loss of hair. 
C) erythema. 
D) blindness.

Question 5

A radiograph that has an overall gray appearance is generally preferred.This x-ray is said to have:

Accepted Answer

A) high density. 
B) low density. 
C) high contrast. 
D) low contrast. 
A) high density. 
B) low density. 
C) high contrast. 
D) low contrast.

Question 6

The heart of the x-ray generating system is the:

Accepted Answer

A) x-ray tube. 
B) insulating oil. 
C) transformer. 
D) position indicator device. 
A) x-ray tube. 
B) insulating oil. 
C) transformer. 
D) position indicator device.

Question 7

The lead collimator is used to ______ of the primary beam.

Accepted Answer

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

Question 8

A good technique for reducing the radiation exposure to both patient and operator is the use of:

Accepted Answer

A) a lead apron. 
B) thinner films. 
C) fast film or digital imaging. 
D) an automatic processor. 
A) a lead apron. 
B) thinner films. 
C) fast film or digital imaging. 
D) an automatic processor.

Question 9

The _______is the portion of the x-ray machine which supplies the electrons to produce x-rays?

Accepted Answer

A) cathode 
B) anode 
C) control panel 
D) focusing cup 
A) cathode 
B) anode 
C) control panel 
D) focusing cup

Question 10

Which is not true of electromagnetic radiation?

Accepted Answer

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

Question 11

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 on 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 on 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 12

The dentist says that the image has too much contrast; he would like to see more grays.What adjustment would you make?

Accepted Answer

A) Increase mA. 
B) Increase kVp. 
C) Decrease kVp. 
D) Decrease mA. 
A) Increase mA. 
B) Increase kVp. 
C) Decrease kVp. 
D) Decrease mA.

Question 13

An exposure time of ½ second is equal to _____ impulses.

Accepted Answer

A) ½ 
B) 12 
C) 30 
D) 2 
A) ½ 
B) 12 
C) 30 
D) 2

Question 14

Heat is reduced from the target by:

Accepted Answer

A) insulating oil. 
B) copper stem. 
C)  aluminum filter. 
D)  both a and b.e. both b and c. 
A) insulating oil. 
B) copper stem. 
C)  aluminum filter. 
D)  both a and b.e. both b and c.

Question 15

The dentist who is credited with the first practical use of radiographs in dentistry in 1896 is:

Accepted Answer

A) Wilhelm Conrad Roentgen. 
B) CHOICE BLANK 
C) Edmund Kells. 
D) John Greenwood. 
E)  V. Black. c. 
A) Wilhelm Conrad Roentgen. 
B) CHOICE BLANK 
C) Edmund Kells. 
D) John Greenwood. 
E)  V. Black. c.

Question 16

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) both a and b. 
A) exposure time. 
B) mA. 
C) kVp. 
D) both a and b.

Question 17

Which of the following organs are not more sensitive to x-rays and therefore not considered critical organs?

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 18

Secondary radiation:

Accepted Answer

A) is often referred to as the useful beam. 
B) is often referred to as the primary beam. 
C) refers to x-radiation that is created when the primary beam interacts with matter. 
D) is a form of radiation that occurs when an x-ray beam has been deflected from its path by interaction with matter. 
A) is often referred to as the useful beam. 
B) is often referred to as the primary beam. 
C) refers to x-radiation that is created when the primary beam interacts with matter. 
D) is a form of radiation that occurs when an x-ray beam has been deflected from its path by interaction with matter.

Question 19

When the exposure button is engaged,what happens?

Accepted Answer

A) The high-voltage circuit is activated. 
B) Kilovolts drive the electrons to the target. 
C) Electrons slam against the target producing the x-ray. 
D) All of the above happen. 
A) The high-voltage circuit is activated. 
B) Kilovolts drive the electrons to the target. 
C) Electrons slam against the target producing the x-ray. 
D) All of the above happen.

Question 20

When in storage,the lead apron should be:

Accepted Answer

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

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

If the operator's film badge indicates an exposure to small amounts of radiation,what should be done?

When the master switch is on:

Which of the following structures will appear radiopaque on dental x-ray film?

One of the earliest signs of overexposure to x-rays may be:

A radiograph that has an overall gray appearance is generally preferred.This x-ray is said to have:

The heart of the x-ray generating system is the:

The lead collimator is used to ______ of the primary beam.

A good technique for reducing the radiation exposure to both patient and operator is the use of:

The _______is the portion of the x-ray machine which supplies the electrons to produce x-rays?

Which is not true of electromagnetic radiation?

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?

The dentist says that the image has too much contrast; he would like to see more grays.What adjustment would you make?

An exposure time of ½ second is equal to _____ impulses.

Heat is reduced from the target by:

The dentist who is credited with the first practical use of radiographs in dentistry in 1896 is:

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

Which of the following organs are not more sensitive to x-rays and therefore not considered critical organs?

Secondary radiation:

When the exposure button is engaged,what happens?

When in storage,the lead apron should be:

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