Radiology Best Answer

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  • 1/87 Questions

    When exposing a radiograph the operator should stand

    • Al least six feet from the xray head
    • Two feet to the right of the primary beam
    • Any distance in back of the xray head
    • Four feet in front of patient
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  • 2. 

    Film fog may occur if there is

    • A light leak in the darkroom

    • Bending of the film

    • Reversal of the film

    • Extremely thick bone

    Correct Answer
    A. A light leak in the darkroom
  • 3. 

    The best technique for reducing the radiation exposure to both patient and operator is the use of

    • An automatic timer

    • Fast film

    • Thinner films

    • A thicker cellulose acetate base

    Correct Answer
    A. Fast film
  • 4. 

    When seating the patient the operator should

    • Tell the patient what is being done

    • Have the patient remove eyeglasses

    • Have the patient remove intraoral removable appliances

    • All of the above

    Correct Answer
    A. All of the above
  • 5. 

    The x ray which is at the center of the primary beam is called the

    • Cathode ray

    • Secondary ray

    • Restricted beam

    • Central ray

    Correct Answer
    A. Central ray
  • 6. 

    To avoid gonadal exposure to x ray which of the follwing may be used

    • Higher kvp

    • Lead apron

    • Finer detailed film

    • Increased vertical angulation

    Correct Answer
    A. Lead apron
  • 7. 

    The operator must avoid

    • Stray radiation

    • Secondary radiation

    • The primary beam

    • All of the above

    Correct Answer
    A. All of the above
  • 8. 

    The gratest danger to the operator is

    • The central ray

    • Secondary radiation

    • Primary x ray beam

    • All of the above are of equal danger

    Correct Answer
    A. All of the above are of equal danger
  • 9. 

    A technique used to measure the operator 's exposure to radiation is

    • To check the color of the operator's fingers

    • For the operator to wear a radiation film badge

    • The frequency of stomach pains

    • To multiply the nunber of films the operator has exposed by 0.1 rem

    Correct Answer
    A. For the operator to wear a radiation film badge
  • 10. 

    Blurred films may result from

    • Incorrect vertical angulation

    • Movement of the patient

    • Increased kvp

    • Old film

    Correct Answer
    A. Movement of the patient
  • 11. 

    If a radiograph remains in the developing solution too long the film will be

    • Lighter

    • Darker

    • Lighter only if the temperature is increased

    • Unaffected because time is not a factor

    Correct Answer
    A. Darker
  • 12. 

    The penetrating power of xrays depend on

    • Kvp

    • Ma

    • Film speed

    • Focal film distance

    Correct Answer
    A. Kvp
  • 13. 

    Scatter radiation is a type of

    • Secondary radiation

    • Primary radiation

    • Stray radiation

    • None of the above

    Correct Answer
    A. Secondary radiation
  • 14. 

    Periapical film

    • Show the entire tooth

    • Show the supporting structure of the tooth

    • Come in various sizes

    • All of the above

    Correct Answer
    A. All of the above
  • 15. 

    The best way to dry processed films is to

    • Place them on paper towels

    • Hang them suspending the films in air

    • Place them in envelopes

    • Place them flat on the counter

    Correct Answer
    A. Hang them suspending the films in air
  • 16. 

    The most penetrating xrays have

    • Low frequencies

    • Soft rays

    • Long wavelengths

    • Long wavelengths

    • Short wavelengths

    Correct Answer
    A. Short wavelengths
  • 17. 

    The first sign of x ray dermatitis is

    • Loss of hair

    • Purulent exudate

    • Erythema

    • Pain

    Correct Answer
    A. Erythema
  • 18. 

    The most radiopaque structure of the tooth is the

    • Enamel

    • Dentin

    • Cementation

    • Pulp chamber

    Correct Answer
    A. Enamel
  • 19. 

    Which characteristic of xrays makes them both beneficial and hazardous?

    • They destroy tissue

    • They cause embolisms

    • They use the body's heat

    • They cause large fatty deposits to form

    Correct Answer
    A. They destroy tissue
  • 20. 

    The radiograph film is covered with an emulsion of

    • Silver bromide salts

    • Cellulose

    • Silver acetate

    • Potassium bromide

    Correct Answer
    A. Silver bromide salts
  • 21. 

    The amount of radiation a person receives

    • Begings anew each day

    • Is cumulative only on the skin

    • Is cumulative in the entire body

    • None of the above

    Correct Answer
    A. Is cumulative in the entire body
  • 22. 

    The raised button on the radiogph aids in

    • Processing

    • Drying

    • Mounting

    • Determining film speed

    Correct Answer
    A. Mounting
  • 23. 

    A constant source of radiation is

    • Strontium 90

    • Natural elements

    • The sun

    • All of the above

    Correct Answer
    A. All of the above
  • 24. 

    Extraoral films are placed in rigid frames called

    • Fim frames

    • Skull plates

    • Jaw plates

    • Cassttes

    Correct Answer
    A. Cassttes
  • 25. 

    Black lines across the film may be the result of

    • Cone cutting

    • Souble exposure

    • Excessive bending

    • Underexposure

    Correct Answer
    A. Excessive bending
  • 26. 

    Exposure of a radiograph on a child

    • Requires less time than an adult

    • Requires more time than an adult

    • Requires the same time as an adult

    • Should never be taken

    Correct Answer
    A. Requires less time than an adult
  • 27. 

    Wich cells are the most sensitive to xrays?

    • Muscle

    • Nerve

    • Sperm

    • Epithelial

    Correct Answer
    A. Sperm
  • 28. 

    Which type of film cannot be used intraorally?

    • Bitewing

    • Occlusal

    • Periapical

    • None of the above

    Correct Answer
    A. None of the above
  • 29. 

    Which cells are the least sensitive to x rays?

    • Ova

    • Blood

    • Sperm

    • Nerve

    Correct Answer
    A. Nerve
  • 30. 

    The quality or penetrating power of secondary radiation is

    • More than that of primary radiation

    • Less than that of primary radiation

    • The same as that of primary radiation

    • Unrelated to that of primary radiation

    Correct Answer
    A. Less than that of primary radiation
  • 31. 

    The fixing solution is

    • Acidic

    • Neutral

    • Basic

    • First basic then neutral after dilution

    Correct Answer
    A. Acidic
  • 32. 

    The panoramic radiograph is not diagnostic for

    • Caries detection

    • General survey

    • Confirmation of mandibular fractures

    • Detection of impacted wisdom teeth

    Correct Answer
    A. Caries detection
  • 33. 

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

    • The dentist

    • The assistant

    • A friend or relative

    • The receptionist

    Correct Answer
    A. A friend or relative
  • 34. 

    The temperature of the radiographic processing solutions is adjusted by

    • Individual heaters

    • Chemical interaction

    • A temperature adjustable water bath

    • Gas heaters

    Correct Answer
    A. A temperature adjustable water bath
  • 35. 

    Xray are most effectively stopped by

    • A vacuum

    • Tungsten

    • Copper

    • Lead

    Correct Answer
    A. Lead
  • 36. 

    The chemicals used in processing solutions are dissolved in

    • Cellulose acetate

    • Distilled water

    • A thick emulsion

    • Potassium bromide

    Correct Answer
    A. Distilled water
  • 37. 

    The maximum whole body dose cosidered permissible to those who work with radiation is

    • 0.1 rem /wk

    • 1 rem/wk

    • 10 rems/wk

    • 100rem/wk

    Correct Answer
    A. 0.1 rem /wk
  • 38. 

    The usual number of films in a complete dentulous radiographic survey is

    • 10

    • 18

    • 24

    • 26

    Correct Answer
    A. 18
  • 39. 

    The size of the collimated beam for intraoral radiology measured at the patient skin is

    • 1.5 to 1.75 inches

    • 2.0 to 2.25 inches

    • 2.75 to 3.00 inches

    • 3.25 to 3.50 inches

    Correct Answer
    A. 2.75 to 3.00 inches
  • 40. 

    Overlapping is a result of

    • Incorrect vertical angulation

    • Incorrect horizontal angulation

    • Excessive bending of the film

    • All of the above

    Correct Answer
    A. Incorrect horizontal angulation
  • 41. 

    Reticulation is

    • Cracking of the film emulsion

    • An electric charge in the developing solution

    • A latent image

    • Due to excess radiation

    Correct Answer
    A. Cracking of the film emulsion
  • 42. 

    Bitewing radiographs are useful in helping to determine

    • Interproximal caries

    • Proximal bone height

    • Fit of crowns

    • All of the above

    Correct Answer
    A. All of the above
  • 43. 

    If a film is exposed on the wrong side the result will be

    • Darker films

    • No image at all

    • No effect

    • A herringbone pattern

    Correct Answer
    A. A herringbone pattern
  • 44. 

    Fixing the film

    • Removes the unaffected silver salts

    • Removes the affected silver salts

    • Softens the film

    • Peels the emulsion from the film base

    Correct Answer
    A. Removes the unaffected silver salts
  • 45. 

    The most radiolucent structure of a tooth is the

    • Enamel

    • Dentin

    • Cementation

    • Pulp chamber

    Correct Answer
    A. Pulp chamber
  • 46. 

    Secondary radiation emanates from the

    • Patient mouth

    • Exposed film

    • Closed end of cone

    • All of the above

    Correct Answer
    A. All of the above
  • 47. 

    Cone cutting results from the central ray

    • Not being aimed at the center of film

    • Having incorrect horizontal angulation

    • Having insufficient vertical angulation

    • Being eliminated from a closed plastic cone

    Correct Answer
    A. Not being aimed at the center of film
  • 48. 

    Film racks should be

    • Clean and dry

    • Numbered and lettered

    • Neither of the above

    • Both of the above

    Correct Answer
    A. Both of the above
  • 49. 

    As the target film distance is increased there is

    • More chance of elongation

    • More chance of overlapping

    • More chance of foreshortening

    • Less distortion

    Correct Answer
    A. Less distortion

Quiz Review Timeline (Updated): Mar 17, 2022 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 17, 2022
    Quiz Edited by
    ProProfs Editorial Team
  • Aug 07, 2010
    Quiz Created by
    Yarilsa
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