RHS Exam Study Guide

171 Questions | Total Attempts: 8809

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RHS Exam Study Guide

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Questions and Answers
  • 1. 
    Changes secondary to caries, periodontal disease and trauma can be illustrated by dental radiographs
    • A. 

      True

    • B. 

      False

  • 2. 
    Which of the following electrons has the greatest binding energy?
    • A. 

      N-shell electrons

    • B. 

      M-Shell electrons

    • C. 

      L-Shell electrons

    • D. 

      K-Shell electrons

  • 3. 
    What type of electrical charge does the electron carry
    • A. 

      Positive charge

    • B. 

      Negative charge

    • C. 

      No charge

    • D. 

      Positive or negative charge

  • 4. 
    Which term describes two or more atoms that are joined by a chemical bond
    • A. 

      Ion

    • B. 

      Ion pair

    • C. 

      Molecule

    • D. 

      Proton

  • 5. 
    Which of the following describes ionization?
    • A. 

      Atom without a nucleus

    • B. 

      Atom that loses an electron

    • C. 

      Atom with equal numbers of protons and electrons

    • D. 

      None of the above

  • 6. 
    Which term describes the process by which unstable atoms undergo spontaneous distintegration in an effort to attain a more balanced nuclear state?
    • A. 

      Radiation

    • B. 

      Radioactivity

    • C. 

      Ionization

    • D. 

      Ionizing radiation

  • 7. 
    Which of the following is not a type of particulate radiation?
    • A. 

      Alpha particles

    • B. 

      Beta particles

    • C. 

      Protons

    • D. 

      Nucleons

  • 8. 
    Which of the following is not a type of electromagnetic radiation?
    • A. 

      Electrons

    • B. 

      Radar waves

    • C. 

      Microwaves

    • D. 

      X-rays

  • 9. 
    Which of the following statements is incorrect?
    • A. 

      Velocity is the speed of a wave

    • B. 

      Wavelength is the distance between waves

    • C. 

      Frequency is the number of wavelengths that pass a given point in a certain amount of time

    • D. 

      Frequency and wavelength are inversely related

  • 10. 
    Which of the following statements is incorrect?
    • A. 

      X-rays travel at the speed of sound

    • B. 

      X-rays have no charge

    • C. 

      X-rays cannot be focused to a point

    • D. 

      X-rays cause ionization

  • 11. 
    Which of the following statements is correct? 
    • A. 

      X-rays are a form of electromagnetic radiation; visible light is not

    • B. 

      X-rays have more energy than does visible light

    • C. 

      X-rays have a longer wavelength than does visible light

    • D. 

      X-rays travel more slowly than does visible light

  • 12. 
    Which of the following is used to increase the voltage in the high-voltage circuit
    • A. 

      Step-up transformer

    • B. 

      Step-down transformer

    • C. 

      Autotransformer

    • D. 

      Step-up circuit

  • 13. 
    Which of the following does not occur when the high-voltage circuit is activated?
    • A. 

      The unit produces an audible and visible signal

    • B. 

      Electrons produced at the cathode are accelerated across the tube to the anode

    • C. 

      X-rays travel from the filament to the target

    • D. 

      Heat is produced

  • 14. 
    Which of the following is the location where thermionic emission occurs?
    • A. 

      Positive cathode

    • B. 

      Positive anode

    • C. 

      Negative cathode

    • D. 

      Negative anode

  • 15. 
    Which of the following is the location where x-rays are produced?
    • A. 

      Positive cathode

    • B. 

      Positive anode

    • C. 

      Negative cathode

    • D. 

      Negative anode

  • 16. 
    Which of the following accounts for 70% of all the x-ray energy produced at the anode?
    • A. 

      General radiation

    • B. 

      Characteristic radiation

    • C. 

      Compton scatter

    • D. 

      Coherent scatter

  • 17. 
    Which of the following occurs only at 70 kVp or higher and accounts for a very small part of the x-rays produced in the dental x-ray machine?
    • A. 

      General radiation

    • B. 

      Characteristic radiation

    • C. 

      Compton scatter

    • D. 

      Coherent scatter

  • 18. 
    Which of the following describes primary radiation?
    • A. 

      Radiation that exits the tubehead

    • B. 

      Radiation that is created when x-rays come in contact with matter

    • C. 

      Radiation that has been deflected from its path by the interaction with matter

    • D. 

      None of the above

  • 19. 
    Which of the following describes scatter radiation?
    • A. 

      Radiation that exits the tubehead

    • B. 

      Radiation that is more penetrating than primary radiation

    • C. 

      Radiation that has been deflected from its path by interaction with matter

    • D. 

      None of the above

  • 20. 
    Which of the following type of scatter occurs most often with dental x-rays?
    • A. 

      Compton

    • B. 

      Coherent

    • C. 

      Photoelectric

    • D. 

      None of the above

  • 21. 
    In dental radiography, the quality of the x-ray beam is controlled by: 
    • A. 

      KVp

    • B. 

      MA

    • C. 

      Exposure time

    • D. 

      Source-to-receptor distance

  • 22. 
    Identify the kilovoltage range for most dental x-ray machines:
    • A. 

      50 to 60 kV

    • B. 

      60 to 70 kV

    • C. 

      65 to 100 kV

    • D. 

      Greater than 100 kV

  • 23. 
    A higher kilovoltage produces x-rays with:
    • A. 

      Greater energy levels

    • B. 

      Shorter wavelengths

    • C. 

      More penetrating ability

    • D. 

      All of the above

  • 24. 
    Identify the unit of measurement used to describe the amount of electric current flowing through the x-ray tube:
    • A. 

      Volt

    • B. 

      Ampere

    • C. 

      Kilovoltage peak

    • D. 

      Force

  • 25. 
    Radiation produced with high kilovoltage results in:
    • A. 

      Short wavelengths

    • B. 

      Long wavelengths

    • C. 

      Less penetrating radiation

    • D. 

      Lower energy levels

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