DHYG 1304 – EXAM 1 QUESTIONS WITH VERIFIED ANSWERS (2025 EDITION) –
COMPREHENSIVE DENTAL HYGIENE STUDY GUIDE
the PID is sometimes called a "cone" because the PID of early dental xray machines was of a pointed
shape - (answers)both statement and reason are correct and related
the purpose of aluminum filtration is to - (answers)absorb the less penetrating long wavelengths to
reduce radiation exposure
t/f: computed tomography eliminates the use of radiation to produce an image - (answers)false
the amount of energy deposited in the teeth or soft tissue by any type of radiation is called the -
(answers)absorbed dose
t/f: a small area on the tungsten target of the anode toward which the electron beam is directed is called
the "focal spot" - (answers)true
dental xray machines contain each of the following components except one. which one is the exception?
- (answers)radioactive material
t/f: xrays make the materials they pass through radioactive - (answers)false
each of the following is an advantage of digital imaging except one. which one is the exception? -
(answers)it allows the use of pointed cones without radiation hazards
guidelines for prescribing radiographs are based on - (answers)all of these
how many electrical circuits are used in a dental xray machine? - (answers)2
, amperage measures the electric potential or force that moves electrons along a conductor. increasing
the force with which the electrons move increases the penetrating potential of the xray beam. -
(answers)the first statement is false. the second statement is true
the first dental radiograph was produced using an exposure time of - (answers)25 minutes
t/f: thermionic emission refers to the release of electrons from the target material during the process of
incandescence - (answers)true
xrays originate at the - (answers)focal spot
dental assistants and dental hygienists meet an important need by providing each of the following except
one. which one is the exception? - (answers)prescribing radiographs
t/f: the PID is used to direct the useful beam of radiation - (answers)true
the wavelength determines the energy and penetrating power of the radiation. the longer the
wavelength, the higher the energy of the radiation - (answers)both statements are true
radiation is best described as a - (answers)movement of energy
what component of the dental xray machine best limits the size of the xray beam to the approximate size
of the image receptor? - (answers)a rectangular PID
t/f: the innermost electron shell in an atom is the k shell - (answers)true
t/f: the compton effect causes xrays to be scattered in all directions - (answers)true
COMPREHENSIVE DENTAL HYGIENE STUDY GUIDE
the PID is sometimes called a "cone" because the PID of early dental xray machines was of a pointed
shape - (answers)both statement and reason are correct and related
the purpose of aluminum filtration is to - (answers)absorb the less penetrating long wavelengths to
reduce radiation exposure
t/f: computed tomography eliminates the use of radiation to produce an image - (answers)false
the amount of energy deposited in the teeth or soft tissue by any type of radiation is called the -
(answers)absorbed dose
t/f: a small area on the tungsten target of the anode toward which the electron beam is directed is called
the "focal spot" - (answers)true
dental xray machines contain each of the following components except one. which one is the exception?
- (answers)radioactive material
t/f: xrays make the materials they pass through radioactive - (answers)false
each of the following is an advantage of digital imaging except one. which one is the exception? -
(answers)it allows the use of pointed cones without radiation hazards
guidelines for prescribing radiographs are based on - (answers)all of these
how many electrical circuits are used in a dental xray machine? - (answers)2
, amperage measures the electric potential or force that moves electrons along a conductor. increasing
the force with which the electrons move increases the penetrating potential of the xray beam. -
(answers)the first statement is false. the second statement is true
the first dental radiograph was produced using an exposure time of - (answers)25 minutes
t/f: thermionic emission refers to the release of electrons from the target material during the process of
incandescence - (answers)true
xrays originate at the - (answers)focal spot
dental assistants and dental hygienists meet an important need by providing each of the following except
one. which one is the exception? - (answers)prescribing radiographs
t/f: the PID is used to direct the useful beam of radiation - (answers)true
the wavelength determines the energy and penetrating power of the radiation. the longer the
wavelength, the higher the energy of the radiation - (answers)both statements are true
radiation is best described as a - (answers)movement of energy
what component of the dental xray machine best limits the size of the xray beam to the approximate size
of the image receptor? - (answers)a rectangular PID
t/f: the innermost electron shell in an atom is the k shell - (answers)true
t/f: the compton effect causes xrays to be scattered in all directions - (answers)true
