Radiology Mid Exam
.
- 1.The "p" in kVp stands for
- A.
Percentage
- B.
Parallel
- C.
Peak
- D.
Punitive
- E.
Paired
- 2.In the x-ray tubehead , " dissipate the heat away from tungesten target " function of :
- A.
Molybdenum cup
- B.
Tubehead seal
- C.
Copper stem
- D.
Insulating oil
- 3.Which type of x-ray account for 70%of all the x-ray energy produced at the anode ?
- A.
Characteristic radiation
- B.
General radiation
- C.
Primary radiation
- D.
Compton scatter
- E.
Coherent scatter
- 4.The cathode and anode are parts of an x-ray tube. The anode is negatively charged.
- A.
The first statement is correct. The second statement is wrong
- B.
The first statement is wrong. The second statement is correct
- C.
Both the statements are correct
- D.
Both the statements are wrong
- 5.
![Type of film holders used during root canal procedures : - ProProfs]( "Type of film holders used during root canal procedures :")
Type of film holders used during root canal procedures :- A.
XCP Bite-Block
- B.
Snap-A-Ray
- C.
Masel Orthodontics
- D.
EndoRay
- E.
Uni-bite
- 6.The 8-inch PID is less effective than 16-inch PID in reducing radiation exposure of the patient
- A.
True
- B.
False
- 7.An example of an electro-magnetic radiation is
- A.
Alpha rays
- B.
Beta rays
- C.
Cathode rays
- D.
Gamma rays
- 8." Cathode " in a X-ray tube is
- A.
A)- source of electrons
- B.
B)- A target
- C.
C)- Negatively charged
- D.
A and c
- E.
All of the above
- 9.Which is the purpose of dental x-ray machine filtration ?
- A.
Decrease beam intensity
- B.
Reduce the size of the x-ray beam
- C.
Regulate the shape of the x-ray beam
- D.
Eliminate low-energy photons
- 10.Which one of the following is characteristic of rectangular PID :
- A.
A)-appears as a closed , pointed plastic cone
- B.
B)-most effective in reducing patient exposure
- C.
C)-no longer used in dentistry
- D.
D)-produce scatter radiation
- E.
A and c
- 11.All dental x-ray machines manufactured after :
- A.
1984
- B.
1874
- C.
1947
- D.
1974
- 12.
![Double-ended instrument that hold the film between two plastic grips : - ProProfs]( "Double-ended instrument that hold the film between two plastic grips :")
Double-ended instrument that hold the film between two plastic grips :- A.
Stabe Bite-Block
- B.
Uni-bite
- C.
Snap-A-ray film holder
- D.
Orthophos XGPlus
- E.
Non of the above
- 13.A form of energy carried by waves or a stream of particles:
- A.
Radiology
- B.
Radiograph
- C.
Dental Radiograph
- D.
Radiation
- E.
X-RAY
- 14.The primary parts of an atom are:
- A.
Proton, nutrino, electron
- B.
Proton, electron, gamma ray
- C.
Photon, electron, neutron
- D.
Proton, electron, neutron
- 15.Most of the energy of the electrons from the cathode is converted to :
- A.
X-rays
- B.
Scatter
- C.
Heat
- D.
Primary beam
- 16.
![Name the following intraoral radiograph - ProProfs]( "Name the following intraoral radiograph")
Name the following intraoral radiograph- A.
Periapical radiograph
- B.
Bitewing radiograph
- C.
Occlusal radiograph
- D.
Biteblock radiograph
- 17.Which of the following describe Lead foil sheet :
- A.
Protect the film from exposure to light and saliva
- B.
Give the film greater sensitivity to X-radiation
- C.
Protect film from backscattered (secondry) radiation
- D.
Contributes to rigidity of packet
- E.
Two of the above is right
- F.
Non of the above
- 18.Most frequently used bite-wing film is :
- A.
The standard film ( size2 periapical film )
- B.
Size 4 bite-wing film
- C.
The film that used to examine the posterior teeth in adults
- D.
The size 3 film
- E.
Non of the above
- 19.The correct relations between crystal size , film speed and image details is :
- A.
Large crystal > high speed > more details
- B.
Large crystal > low speed > less details
- C.
Small crystal >low speed > less details
- D.
Small crystal > low speed > more details
- 20.A dental patient has thick soft tissues and dense bone , to compensate for this increase in subject thickness and to provide an image of diagnostic density , the dental radiographer may do all of the following except :
- A.
Increase the mA
- B.
Decrease focal spot size
- C.
Increase exposure time
- D.
Increase kVp
- 21.Decrease the operating kilovoltage peak will cause :
- A.
An increase in density ; the image appears darker
- B.
An increase in density ; the image appears lighter
- C.
A decrease in density ; the image appears darker
- D.
A decrease in density ; the image appears lighter
- 22.The heart of the x ray generating system is
- A.
Position indicating device PID
- B.
Lead collimator
- C.
Metal housing
- D.
Transformer
- E.
X ray tube
- 23.Which of the following statement is true ?
- A.
Small lymphocytes consider one of the least susceptible to ionizing radiation
- B.
The last event in the sequence of radiation injury is latent period
- C.
Direct theory of radiation injury suggests that cell damage result when ionizing radiation directly hits critical area
- D.
Long term effects are seen with small amount of radiation absorbed in short period
- 24.Conventional calcium tungeston screen require less x ray expure than do rare earth screen
- A.
True
- B.
False
- 25.The SI unit for measuring radiation exposure by determining the amount of ionization that occurs in the air is termed :
- A.
Gray ( Gy )
- B.
Coulombs per kilogram ( C/Kg )
- C.
Sievert ( Sv )
- D.
Roentgen ( R )
- E.
Radiation absorbed dose ( rad )
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