Test Physics Num 1

59 Questions | Total Attempts: 80

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Test Physics Num 1


Questions and Answers
  • 1. 
    Which of these are dispersions (dispersed systems)? What do we call dispersed systems?
    • A. 

      Salt solutions

    • B. 

      Suspensions, emulsions, aerosols, other mixtures

    • C. 

      Materials which disperse light

    • D. 

      Materials which disperse sound waves

  • 2. 
    Which of the following phenomena is observable when alternating current is applied to live tissues?
    • A. 

      Translational motion of ions

    • B. 

      Dielectric polarization

    • C. 

      Electrostatic induction

    • D. 

      Ion fluctuation

    • E. 

      Electroosmosis

  • 3. 
    Which of the following phenomena is observable when direct current is applied to live tissues?
    • A. 

      Ion fluctuation

    • B. 

      Dielectric polarization

    • C. 

      Translational motion of ions and the redistribution of their concentrations

    • D. 

      Skin Skin effect

    • E. 

      Electrostatic induction

  • 4. 
    General tissue impedance dispersion?
    • A. 

      The relation of the impedance and the capacitance of the tissue

    • B. 

      The relation of the impedance and the amount of fluid in the tissue

    • C. 

      The relation of the impedance and the strength of the current flowing through the tissue

    • D. 

      The relation of the impedance and the frequency of the current flowing through the tissue

    • E. 

      The relation of the impedance and the frequency of the magnetic field affecting the tissue

  • 5. 
    Which of the following phenomena is observable when a static magnetic field affects live tissues?
    • A. 

      The rotation of polar particles along the field‘s line of force

    • B. 

      The rotation of paramagnetic particles along the field‘s line of force

    • C. 

      Electrostatic induction

    • D. 

      Thermal phenomena

    • E. 

      Cell polarization

  • 6. 
    What is electrophoresis?
    • A. 

      The movement of dispersive particles when affected by gravitational force

    • B. 

      The movement of dispersive particles due to pressure disparity

    • C. 

      The movement of dispersive media when affected by an electric field

    • D. 

      The movement of dispersive particles when affected by an electric field

  • 7. 
    Which of the following phenomena is observable when an alternating electric field affects live tissues?
    • A. 

      A change in cell polarity/polarization

    • B. 

      Electromagnetic induction

    • C. 

      The rotation of paramagnetic particles

  • 8. 
    What is observed in tissues due to the Hall effect?
    • A. 

      Cell polarization

    • B. 

      Ion fluctuation

    • C. 

      The production of a voltage difference across the walls of a blood vessel  

    • D. 

      Foucault currents? Not the correct one anyway

    • E. 

      Movement of paramagnetic particles

  • 9. 
    Which of the following phenomena is observable when a static electric field affects live tissues?
    • A. 

      The rotation of paramagnetic particles along the field‘s line of force

    • B. 

      Electrostatic induction

    • C. 

      Electrochemical activation

    • D. 

      Electromagnetic induction

    • E. 

      Thermal phenomena

  • 10. 
    Which of the following phenomena is observable when an alternating magnetic field affects live tissues?
    • A. 

      Rotation of polar particles

    • B. 

      Paramagnetic particle fluctuation

    • C. 

      Hall effect

    • D. 

      Ion fluctuation

    • E. 

      Electromagnetic induction

  • 11. 
    Electrical (ion) mobility is best described as:
    • A. 

      The speed of an ion with a charge equal to an elementary charge (the charge of a single electron or -1.602176634×10−19 C) in an electric field)

    • B. 

      The speed that an ion gains when a 1A electric current is applied

    • C. 

      The speed of an ion in a 1 V/m electric field

    • D. 

      Speed of an ion in a 1 A/m magnetic field

    • E. 

      The force affecting ions in a 1 V/m electric field

  • 12. 
    Nuclear magnetic resonance (NMR) is best described as:
    • A. 

      The magnetisation of material when affected with a constant magnetic field

    • B. 

      The absorbtion of certain frequency electromagnetic waves in material when affected with a constant magnetic field (due to electrons jumping from a lower to a higher energy state in atoms)

    • C. 

      A sudden increase in the amplitude of nuclei fluctation (oscillation) of atoms when affected with a constant magnetic field and certan frequency electromagnetic waves

    • D. 

      The absorbtion of certain frequency electromagnetic waves in material when affected with a constant magnetic field (due to a shift in the magnetic moment orientation of atom nuclei)

  • 13. 
    The magnetic moment pm of a current flowing through a conductive ring is equal to: (S – ring area, I – electrical current strength)
    • A. 

      Pm = I/S

    • B. 

      Pm = I*S

    • C. 

      Pm = (I*p)/S

    • D. 

      Pm = (I*S)/p

    • E. 

      Pm = S/I

  • 14. 
    Which of these correctly expresses the main condition of NMR?
    • A. 

      Hv = gbrβbrB

    • B. 

      Hv = gbrβbrI

    • C. 

      Hv = gbrβbrmbr

    • D. 

      Hv = gbrB

    • E. 

      Hv = gbrβbr/B

  • 15. 
    Paramagnetic material is best described as a material, with particles that have:
    • A. 

      Electric dipole moment

    • B. 

      Electric quadrupole moment

    • C. 

      Magnetic moment

    • D. 

      Magnetic charge

  • 16. 
    The Nyquist Theorem states that:
    • A. 

      A continuous-time signal is only defined at certain moments in time

    • B. 

      A discrete-time signal is described using only the theory of relativity

    • C. 

      The sampling frequency can‘t be lower than 2x the signal frequency

    • D. 

      A continuous-time signal cannot be described

    • E. 

      Discrete-time signals do not appear during biological processes

  • 17. 
    Which of these biosignals is of electrical origin?
    • A. 

      Phonocardiogram

    • B. 

      Arterial blood pressure curve

    • C. 

      Seismocardiogram

    • D. 

      Rheocardiogram

  • 18. 
    Electrocardiogram (ECG) is best described as:
    • A. 

      The evaluation of mechanical heart function

    • B. 

      Electrical heart function

    • C. 

      A measurement of heart function induced change in potential difference between two areas of the body

    • D. 

      The spread of an excitory signal towards the extremities

  • 19. 
    The positive and negative charges in a dipole model of the heart are:
    • A. 

      The non-excited and excited heart areas

    • B. 

      The inside and outside of a heart cell

    • C. 

      The positive and negative electrode

    • D. 

      The heart‘s eletrical axis

  • 20. 
    The electrical irritability law describes the relation between:
    • A. 

      The maximum irritation current strength and irritation duration

    • B. 

      The lowest possible irritation current strength still able to irritate and irritation duration

    • C. 

      Irritation current strength and voltage

    • D. 

      Lowest and maximum irritation current strength

    • E. 

      Rheobase and chronaxie

  • 21. 
    Rheobase is:
    • A. 

      Highest possible irritation current strength

    • B. 

      Lowest irritation current strength when irritation duration is very short

    • C. 

      The lowest current strength still able to irritate

    • D. 

      Longest possible irritation duration

  • 22. 
    Chronaxie is:
    • A. 

      The shortest duration of irritation when strength is equal to rheobase

    • B. 

      Highest possible irritation current strength

    • C. 

      Longest duration of irritation

    • D. 

      Shortest duration of irritation when current strength is equal to 2x rheobase

  • 23. 
    The minimal stimulation energy principle states that:
    • A. 

      Tissue is damaged the least when stimulated with weakest current

    • B. 

      The lowest amount of energy is used when current strength is equal to rheobase

    • C. 

      The lowest amount of energy is used when stimulation duration is equal to chronaxie

    • D. 

      The lowest amount of energy is used when stimulation duration is equal to 2x chronaxie

  • 24. 
    X is used to prevent disturbant phenomena that occur between the electrode and the tissue:
    • A. 

      Differential amplifier

    • B. 

      Functional grounding

    • C. 

      Proper selection of electrode material

    • D. 

      Low frequency filters

  • 25. 
    In the space between the electrode and tissue appear:
    • A. 

      Acoustic waves

    • B. 

      Intensive electromagnetic radiation

    • C. 

      Double electric layer

    • D. 

      Charge-repellant forces

    • E. 

      Excitory wave

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