RAD MIDTERM 1 TCDHA EXAM WITH
COMPLETE QUESTIONS AND ANSWER
[VERIFIED ANSWERS] RATED A GRADE
2024/2025
Which of the following would you place in the patient's mouth in order to take dental x-
rays?
a) Image
b) Image Receptor
c) Radiograph
d) Dental radiograph - ✔✔answers✔✔b. Image Receptor
Which subatomic particle carries a negative electrical charge?
a) A Neutron
b) A Proton
c) An Electron
d) A Nucleon - ✔✔answers✔✔c. An Electron
What is the binding energy or binding force of an electron is... -
✔✔answers✔✔Determined by the distance between the orbiting electrons and the
nucleus
A spontaneous emission of radiation from the disintegration of unstable atomic nuclei
is... - ✔✔answers✔✔Radioactivity
Cathode rays are derived from which of the following types of particulate radiation?
a. Electrons
b. Alpha Particles
c. Protons
d. alpha particle decay - ✔✔answers✔✔a. Electrons
What type of radiation includes x-rays and visible light? -
✔✔answers✔✔Electromagnetic
Approximately what percentage of the kinetic energy of the electrons is converted to x-
rays at the anode? - ✔✔answers✔✔Less than 1%
What restricts the size of the x-ray beam? - ✔✔answers✔✔The Lead Collimator
A form of energy carried by waves or streams of particles is defined as... -
✔✔answers✔✔Radiation
, The x-ray was discovered by... - ✔✔answers✔✔Wilhelm Roentgen
Who MODIFIED the paralleling technique with the introduction of the long-cone
technique? - ✔✔answers✔✔F. Gordon Fitzgerald
Which form of the x-ray beam is more detrimental to the patient and operator? -
✔✔answers✔✔Scatter Radiation
What happens with the electrons when the kilovoltage is increased? -
✔✔answers✔✔The electrons moves from the CATHODE to the ANODE with more
speed
Higher-energy x-ray beam with increased penetrating ability results by... -
✔✔answers✔✔When the kilovolt is increased
(1) Density is the overall darkness or blackness of a dental image. (2) When the
kilovoltage is increased while other exposure factors remain constant, the resultant
image exhibits a decreased density and appears lighter.
a. Both statement are true
b. Both statement are false
c. The first statement is true; the second statement is false - ✔✔answers✔✔c. The first
statement is true; the second statement is false
What controls the quantity of x-rays produced? - ✔✔answers✔✔Milliamperage (mA)
In regard to increasing density: - ✔✔answers✔✔An increase in either kVp or mA will
increase density.
According to inverse square law, the intensity of radiation is ________ proportional to
the _________ from the source of radiation. - ✔✔answers✔✔Inversely; square of the
distance
Aluminium filters are used to remove ________ -energy, _________ wavelength x-rays.
- ✔✔answers✔✔Low; Longer
What specific mechanism of radiation injury may result in the formation of hydrogen
peroxide when x-ray energy is absorbed by patients? - ✔✔answers✔✔Free radical
formation created by the ionization of water may occur.
What is associated with long-term radiation effects? - ✔✔answers✔✔Small amounts of
radiation absorbed over a long period.
Which of the following is the LEAST sensitive to x-rays?
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