PMU - Year 1 Physics - Part 2

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Which substances have both intrinsic, and extrinsic electric conductivity:

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Dielectrics can be described as having:

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P-doping of semiconducting germanium (Ge), will create additional energy levels;

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The band-gap width of a dielectric (insulator) is:

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Band theory of solids defines conductors as having:

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N-doping of semiconducting germanium (Ge), will create additional energy levels:

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Valence and conductivity bans overlap partially in:

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Charge carriers of certain type (n or p) will dominate in a semiconductor when:

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What is the difference between dielectrics and semiconductors, according to band theory of solids.

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Current carriers in semiconductors are:

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What type of current carriers are the holes:

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How does intrinsic conductivity of semiconductors depend on temperature?

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How does intrinsic conductivity of semiconductors depend on Temperature?

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What are the current carriers in a P-N junction, upon application of forward bias?

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Using OHM's LAW: In order to assess the medicinal effect of a substance, in dermatology, the skin impedance Z is studied by:

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The electric impedance of biological tissues is composed of:

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Using OHM's LAW: Capacity reactance of an AC circuit is equal to:

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Using OHM's LAW: The direction of electrical current fluctuates with time in:

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Using OHM's LAW: Ohm's law states:

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Using OHM's LAW: Electric current is:

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The unit for electrical conductivity is:

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The unit for electrical resistance is:

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What type of tissue or body fluid have the highest electrical conductivity:

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What is the frequency of direct currents (DC)

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What type of electrical current is a lightning bolt?

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What type of electrical current is a galvanic current?

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What type of electric impedance is present in the human tissue?

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What type of electric impedance is present in the human tissue?

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Transducer is a device for:

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What type of transducer is the piezoelectric crystal? (e.g. transducers in echo-graphs)

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What type of transducer is the ionization chamber:

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Which of the objects mentioned below is a transducer:

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Which of the objects mentioned below is NOT a transducer:

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Which of the following functions are performed by a photocell:

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Thermocouple is an arrangement of two different metals:

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Which of the following is NOT a transducer

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Which is the most relevant electromyography parameter for determination of damaged tissue

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In an active electro-diagnostics the source of E.M.F (Electromotive Force):

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In a passive electro-diagnostics the course of Electromotive Force is:

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ECG is a method of:

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EEG is a method of:

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EMG is a method of:

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The active electro-diagnostic differs from the passive one in the fact that source of Electromotive Force:

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The defibrillator is used to:

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The cardio-stimulator (the pacemaker) is:

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The cardio-stimulator (the pacemaker) is supplied by:

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For electrostimulation on an object to occur, a minimum threshold stimulus is needed. This electrical stimulus depends on:

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Faradization is a method for:

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Microwave therapy uses:

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The most suitable frequency magnetic field is used in:

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High Frequency magnetic field is used in:

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Deep heating of tissues (Therapeutic Diathermia) is applied using a high frequency current of the order of:

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High frequency AC is less harmful to the body than low frequency AC. This is because high frequency AC:

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Microwave diathermy uses frequency of 2.450 GHz. This frequency is:

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What type of accident is most common during microwave diathermy:

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The most prominent effect of DC on the human body is:

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Which of the following effects is NOT characteristic for AC

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Which of the following effects is characteristic for low frequency (50 Hz) alternative current:

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Which of the following effects is characteristic of high frequency (2 MHz) alternative current:

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Which therapeutic method causes deep tissue heating:

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UHF with high frequency electromagnetic waves (= GHz) are used in:

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Negative, light aeroions have:

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Positive Aeroions have:

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The franklinization (electric shower) is a method in:

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In the Franklilization (electric shower) the negative electrode is:

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Favorable effect on the organism have:

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The concentration of light, negative aeroions is higher in:

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Iontophoresis uses:

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Iontophoresis is a method for:

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During Iontophoresis, if active pharmaceutical ion is positive, the active electrode is:

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What is the difference between Sonophoresis and Iontophoresis:

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The constant magnetic field applied to the patient in MRI examination is:

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What part of the hydrogen nuclei (protons) are examined tissues participates in the processes of forming a diagnostic image:

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In order to observe the phenomenon of Nuclear Magnetic Resonance (NMR), in an atomic nucleus must be:

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The contrast between different biological tissues in MRI is obtained from:

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Medicinal Substances with anti-oxidation properties are analysed using:

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The chemical shift is an important parameter for direct observation of the chemical basis of disease, in:

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Which is the most common contrast substance used in MRI

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Volume Concentration of Protons is a parameter in diagnostic image formation in:

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Contrast substances used MRI are:

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Contrast substances used in MRI diagnostics modify:

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Longitudinal time of relaxation T1 is a parameter used in:

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Transversal time of relaxation T2 is parameter used in:

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In MRI, the electric signals from different small volume elements (voxels) in examined tissues are distinguished by:

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The effect of the high frequency electromagnetic field on examined tissues in MRI is:

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