WorksheetsTIM_2024_1
Total questions: 12
Worksheet time: 6mins
On which "three whales" are the properties of materials based?
Structural defects
Phase composition
Chemical bonds
Temperature fluctuations
What three major groups are considered in the properties of material conductivity?
1, 2, 3
A, B, C
M, D, SC
X, Y, Z
What law describes the electrical conductivity of materials?
Law of Coulomb
Ohm's Law
Archimedes' Principle
Newton's Law
What materials exhibit superconductivity?
Glass, crystals, semiconductors
Silver, silicon, copper
Titanium, vanadium, niobium
Aluminum, gold, molybdenum
What does the coefficient of thermal expansion describe?
Thermal oscillations of atoms
Change in material volume with temperature change
Resistance of material to heat transfer
Material's thermal conductivity
What does the Wiedemann-Franz law mean?
What does the Wiedemann-Franz law mean?
The absence of free electrons, only lattice thermal conductivity
The relative contribution of lattice thermal conductivity depends on free electrons
The thermal conductivity of the lattice depends on the mass of the molecules
The thermal conductivity of electrons is much greater than the thermal conductivity of the lattice
What material has a thermal conductivity coefficient κ = 0.60 [W/cm-K]?
Bismuth Telluride
Germanium (n-type)
Copper
Stainless Steel
What depends on the scattering mechanism and heat capacity of the lattice (phonons)?
Thermal conductivity
Electrical conductivity
Speed of sound in the material
Thermal expansion
What properties of materials can be determined by their structural defects?
Thermal conductivity
Electrical conductivity
Magnetic properties
Optical properties
What is the relationship between temperature and resistance in a conductor?
Directly proportional
Inversely proportional
No relationship
Exponential relationship
What is the unit of thermal conductivity?
W/m
W/m-K
Joules
Calories
What is the effect of impurities on the electrical conductivity of a material?
Increases conductivity
Decreases conductivity
No effect
Depends on the type of impurity
