# Test Physics Num 1

59 Questions | Total Attempts: 109  Settings Create your own Quiz • 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.

• 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.

• C.

Double electric layer

• D.

Charge-repellant forces

• E.

Excitory wave

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