Deck 4: Physical Properties of Materials

Question 1

The specific gravity of a material is the ratio of its density relative to the density of water:

Answer 1

True

Question 2

The strength-to-weight ratio of a material is its yield strength divided by its density:

Answer 2

False

Question 3

The coefficient of thermal expansion measures the change in volume of a material per degree of temperature:

Answer 3

False

Question 4

The thermal expansion properties of polymers are generally

A)greater than
B)less than
C)the same as those of metals

Question 5

In the heating of most metal alloys, melting begins at a certain temperature and concludes at a higher temperature.In these cases, which of the following temperatures marks the beginning of melting:

A)liquidus
B)solidus

Question 6

Volumetric specific heat is best defined by which one of the following:

A)capability of a material to transfer heat through itself
B)density divided by specific heat
C)specific heat divided by density
D)specific heat multiplied by density

Question 7

The thermal diffusivity of a material is its thermal conductivity divided by its specific heat:

Question 8

Copper is generally considered easy to weld because of its high thermal conductivity:

Question 9

The mass diffusion rate dm/dt across a boundary between two different metals is a function of which of the following variables (four best answers):

A)concentration gradient dc/dx
B)contact area
C)density
D)melting point
E)thermal expansion
F)temperature
G)time

Question 10

Ohm's Law is expressed by which one of the following relationships:

A)current = voltage divided by resistivity
B)current = voltage multiplied by resistance
C)power = current multiplied by voltage
D)resistance = voltage multiplied by current
E)voltage = current multiplied by resistance

Question 11

The electrical conductivity of a material is the reciprocal of its resistivity:

Question 12

A superconductor is characterized by which one of the following:

A)high conductivity
B)resistivity properties between those of conductors and semiconductors
C)very low resistivity
D)zero resistivity

Question 13

In an electrolytic cell, the anode is the electrode that is

A)positive
B)negative.