Question 1

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 2

A step-down transformer is necessary within the x-ray circuitry to:

Accepted Answer

A) increase exposure time. 
B) move electrons at a high speed to the target. 
C) boil off electrons from the filament. 
D) all of the above. 
A) increase exposure time. 
B) move electrons at a high speed to the target. 
C) boil off electrons from the filament. 
D) all of the above.

Question 3

A lead apron and a thyroid collar:

Accepted Answer

A) are utilized 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 utilized 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

Filtration is used to _____ and are discs made of ______.

Accepted Answer

A) remove long wavelengths from the beam; aluminum 
B) remove long wavelengths from the beam; copper 
C) restrict the size of the beam; lead 
D) restrict the size of the beam; aluminum 
A) remove long wavelengths from the beam; aluminum 
B) remove long wavelengths from the beam; copper 
C) restrict the size of the beam; lead 
D) restrict the size of the beam; aluminum

Question 5

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

Accepted Answer

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

Question 6

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 7

A patient is concerned with radiation exposure.You can assure him that your office utilizes the ALARA concept.What does that include?

Accepted Answer

A) Reducing the number of exposures 
B) Minimizing retakes 
C) Keeping exposures levels as low as possible 
D) All of the above 
A) Reducing the number of exposures 
B) Minimizing retakes 
C) Keeping exposures levels as low as possible 
D) All of the above

Question 8

How much filtration is federally required for a dental x-ray machine operating over 70 kVp?

Accepted Answer

A) 2.75 mm 
B) 2.50 mm 
C) 2.25 mm 
D) 0.5 mm 
A) 2.75 mm 
B) 2.50 mm 
C) 2.25 mm 
D) 0.5 mm

Question 9

Chronic radiation exposure occurs when _____ doses of radiation is received over a ____ time period.

Accepted Answer

A) large; short 
B) large; long 
C) small; short 
D) small; long 
A) large; short 
B) large; long 
C) small; short 
D) small; long

Question 10

Who should hold the film in a patient's mouth if the patient is unable to do so?

Accepted Answer

A) Receptionist 
B) Parent or relative of the patient 
C) Assistant 
D) Dentist 
A) Receptionist 
B) Parent or relative of the patient 
C) Assistant 
D) Dentist

Question 11

Which of the following statements is true concerning the structure of the atom?

Accepted Answer

A) The nucleus contains protons and electrons. 
B) Electrons have no weight or mass. 
C) The orbital path of an electron around the nucleus is called an electron shell. 
D) Electrons are unstable in their orbits and shift freely. 
A) The nucleus contains protons and electrons. 
B) Electrons have no weight or mass. 
C) The orbital path of an electron around the nucleus is called an electron shell. 
D) Electrons are unstable in their orbits and shift freely.

Question 12

Anything that occupies space and has a form or shape is:

Accepted Answer

A) energy. 
B) solid. 
C) matter. 
D) a photon. 
A) energy. 
B) solid. 
C) matter. 
D) a photon.

Question 13

Primary radiation is:

Accepted Answer

A) also called the useful beam. 
B) the beam of x-rays that comes from the target. 
C) less penetrating than secondary radiation. 
D) both a and b. 
A) also called the useful beam. 
B) the beam of x-rays that comes from the target. 
C) less penetrating than secondary radiation. 
D) both a and b.

Question 14

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 15

Which of the following tissues has the highest radiation sensitivity?

Accepted Answer

A) Small lymphocytes 
B) Salivary gland 
C) Kidney 
D) Muscle tissue 
A) Small lymphocytes 
B) Salivary gland 
C) Kidney 
D) Muscle tissue

Question 16

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 17

Which is not true regarding film badges?

Accepted Answer

A) They should be worn at work only. 
B) The badge is usually worn for 3 to 4 weeks before returning it for reading. 
C) They should be worn when any form of x-ray is taken. 
D) If an assistant follows all safety precautions, exposure should be near zero. 
A) They should be worn at work only. 
B) The badge is usually worn for 3 to 4 weeks before returning it for reading. 
C) They should be worn when any form of x-ray is taken. 
D) If an assistant follows all safety precautions, exposure should be near zero.

Question 18

Exposure to radiation:

Accepted Answer

A) no matter how small, has the potential to cause harmful biologic changes. 
B) has a threshold, below which exposure is entirely safe. 
C) is safer when there is a single, large dose rather than a series of smaller doses. 
D) from a dental x-ray machine does not involve particulate radiation and is completely safe. 
A) no matter how small, has the potential to cause harmful biologic changes. 
B) has a threshold, below which exposure is entirely safe. 
C) is safer when there is a single, large dose rather than a series of smaller doses. 
D) from a dental x-ray machine does not involve particulate radiation and is completely safe.

Question 19

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 20

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

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

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

A step-down transformer is necessary within the x-ray circuitry to:

A lead apron and a thyroid collar:

Filtration is used to _____ and are discs made of ______.

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

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

A patient is concerned with radiation exposure.You can assure him that your office utilizes the ALARA concept.What does that include?

How much filtration is federally required for a dental x-ray machine operating over 70 kVp?

Chronic radiation exposure occurs when _____ doses of radiation is received over a ____ time period.

Who should hold the film in a patient's mouth if the patient is unable to do so?

Which of the following statements is true concerning the structure of the atom?

Anything that occupies space and has a form or shape is:

Primary radiation is:

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.

Which of the following tissues has the highest radiation sensitivity?

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

Which is not true regarding film badges?

Exposure to radiation:

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

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

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

Filtration is used to _ and are discs made of __.

Chronic radiation exposure occurs when _ doses of radiation is received over a time period.

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.