Electrical resistivity and conductivity - Quiz
A) Chemical reactions within the lattice B) The movement of protons C) A positive ionic lattice D) A sea of dissociable electrons
A) Kilometres per second B) Metres per second C) Metres per hour D) Centimetres per year
A) High velocity of electrons B) Direct physical contact between electrons C) Propagation of an electromagnetic field D) Mechanical momentum transfer
A) Particles B) Waves C) Gas molecules D) Static charges
A) The lack of electrons B) The absence of a lattice C) Interference of electron waves D) High voltage potential
A) Increases electron drift velocity B) Removes the ionic lattice C) Decreases lattice vibrations D) Increases lattice vibrations
A) Impurities stop the electromagnetic field B) Impurity ions block electrons physically C) Impurities decrease the number of electrons D) Different ions act as irregularities
A) It becomes zero B) It increases significantly C) It stays exactly the same D) It decreases slightly
A) Absolute zero vibrations B) Long range crystalline order C) Short range order D) No crystalline structure
A) A negative ionic lattice B) A positive ionic lattice C) An electron-only lattice D) A non-conductive lattice
A) Significantly smaller B) Significantly larger C) Variable but usually higher D) Exactly the same
A) The cooling of the metal B) The change in electron mass C) The decrease in lattice purity D) An applied electric field
A) Due to the lack of resistance in the wire B) Due to the sheer number of moving electrons C) Due to the electromagnetic field speed D) Due to the high mass of the electrons
A) The total absence of electron movement B) The rapid loss of short range order C) The increase in crystal lattice symmetry D) Strong correlation between ion positions
A) Fermi-Dirac statistics. B) Pauli exclusion principle. C) Heisenberg uncertainty principle. D) Ohm's law.
A) Conduction threshold. B) Band gap. C) Fermi level. D) Valence level.
A) They can easily jump among partially occupied states. B) They have higher energy than the nucleus. C) They have zero mass. D) They are not bound by the Pauli exclusion principle.
A) They are always forbidden. B) They are completely filled. C) They are completely empty. D) They contain the Fermi level.
A) Within a partially filled band. B) At the very bottom of the lowest band. C) Within a band gap. D) At the highest possible energy level.
A) The material has no electron bands. B) There are no available states near the Fermi level. C) The electrons are too heavy to move. D) The Fermi level is too high.
A) Silver B) Gold C) Rubber D) Copper
A) Anisotropic B) Homogeneous C) Amorphous D) Isotropic
A) A scalar B) A vector C) A rank-2 tensor D) A scalar field
A) Total lack of current flow B) Perfectly parallel alignment of all fields C) Absence of magnetic fields D) Rotational invariance about the z-axis
A) The imaginary unit B) A component index C) The material density D) The current constant
A) Copper B) Rubber C) Glass D) Wood
A) siemens per metre (S/m) B) siemens C) ohms D) ohm-metre (Ω⋅m)
A) κ (kappa) B) σ (sigma) C) γ (gamma) D) ρ (rho)
A) Faraday's law B) Pouillet's law C) Ohm's law D) Coulomb's law
A) Directly proportional B) Exponentially proportional C) It has no effect D) Inversely proportional
A) n, p, or q B) Ω, S, or A C) σ, κ, or γ D) ρ, R, or C
A) Very low B) Zero C) Infinite D) Moderate
A) Increase the resistance B) Increase majority charge carrier concentration C) Eliminate all holes D) Decrease the band gap width
A) Does not affect resistance B) Makes resistance infinite C) Reduces resistance D) Increases resistance
A) Thermally generated carriers B) Metal impurities C) Dopant atoms D) Conduction band electrons only
A) Solid polymers B) Metallic copper C) Distilled water D) Molten salts
A) Module of ion charge B) Dissociation coefficient C) Mobility of ions D) Critical temperature
A) Impurities and defects B) Ion dissociation C) Magnetic vortices D) High-temperature superconductivity
A) Extremely low but nonzero B) Truly zero C) Variable based on voltage D) Moderate
A) Purity increases the resistivity of water B) The purer the water, the lower the conductivity C) The purer the water, the higher the conductivity D) Purity has no effect on conductivity
A) Very poor conductors B) Electrical insulators C) Very good conductors D) Semiconductors
A) High resistivity B) The presence of glass C) Good electrical conductivity D) Lack of charge carriers
A) 100 °C B) 25 °C C) 0 °C D) 20 °C
A) Gold B) Copper C) Silver D) Aluminum
A) The type of wood species B) Moisture content C) The length of the wood D) The age of the tree
A) At least 1020 B) At least 102 C) At least 1010 D) At least 105
A) Increased resistance B) Immediate combustion C) Molecular hardening D) Insulation breakdown
A) When temperature does not vary too much B) When absolute zero is reached C) When measuring superconductors D) When temperature varies over a large range
A) Matthiessen's rule B) Bloch–Grüneisen formula C) Ohm's law D) Debye law
A) x B) A C) T D) n
A) Fermi surface inversion B) Phonon coupling C) Superconductivity D) Defect scattering
A) Felix Bloch B) Eduard Grüneisen C) Augustus Matthiessen D) Heike Kamerlingh Onnes
A) Arrhenius model B) Kondo insulator model C) Wiedemann–Franz law D) Steinhart–Hart linear model
A) Calculating residual resistivity B) Defining the Boltzmann constant C) Calibrating thermistors D) Measuring quantum tunneling rates
A) The total number of localized sites B) The electron charge C) A value depending on system dimensionality D) The temperature scale constant
A) cmln(μT) B) aT2 C) ρ0 D) bT5
A) Thermal conductivity B) Electron charge C) Boltzmann constant D) Electric conductivity
A) Permittivity B) Impedivity C) Reactivity D) Admittivity
A) Susceptivity B) Resistivity C) Reactivity D) Conductivity
A) Reactance B) Admittivity C) Impedivity D) Permittivity
A) Reactivity B) Impedance C) Susceptivity D) Resistivity
A) Linear regression B) Ohm's Law only C) Finite element analysis D) Simple algebraic formulas
A) R = rho * l / A B) J(r) = sigma(r)E(r) C) I = V / R D) E = I * R
A) The simple resistivity formula B) The continuity equation C) The power dissipation formula D) The Kirchhoff current law
A) Susceptivity B) Permittivity C) Impedivity D) Reactivity
A) Cooling gases to near absolute zero B) Mechanical air pumps C) Chemical oxygen removal D) Boiled mercury in a Torricellian tube
A) 1825 B) 1900 C) 1827 D) 1774
A) 1827 B) 1774 C) 1900 D) 1825
A) Melting point of the conductor B) Resistivity-density product C) Absolute resistivity D) Total cost of material |
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