ENGR 0022
Materials: Structure and Properties
Exam 1
Spring 2026
Name (print): ______________________________________________
• Exam must be completed in 50 minutes
• Closed book (no phones)
I have neither given nor received unauthorized assistance on this test:
Signature: ________________________________________________
, Section 1: True/False (2 points each, 20 points total)
Enter T for True or F for False before each statement.
__T__ 1. It is possible to determine accurately the density of a piece of an unidentified
material even if the volume is not known.
__F__ 2. Glasses and ceramics generally have similar crystal structures and properties.
Glasses do not have crystal structures (by definition).
__T__ 3. In elastic deformation, the stored elastic energy per unit volume of a material is
proportional to the square of the stress.
__F__ 4. The elastic modulus of a material depends on the applied stress. The elastic modulus
is a material property that is independent of the applied stress.
__F__ 5. The density of a pure element can be accurately calculated as long as the atomic
mass and the crystal structure are known. The atomic radius is also needed.
__T__ 6. The low elastic modulus of a thermoplastic polymer is related to the low stiffness of
intermolecular bonds between the polymer chains.
__T__ 7. Thermoset polymers and elastomers are always amorphous (non-crystalline).
__F__ 8. The minimum elastic modulus of a composite containing aligned fibers can be
determined by the rule of mixtures.
__F__ 9. The density of a closed cell foam measured using the double weighing method will be
higher than the density of an open cell foam if the volume fraction of pores is the same
in both cases. The density is equal if the volume fraction of pores is the same.
__T__ 10. The FCC crystal structure contains 4 octahedral interstitial sites in its unit cell.
Materials: Structure and Properties
Exam 1
Spring 2026
Name (print): ______________________________________________
• Exam must be completed in 50 minutes
• Closed book (no phones)
I have neither given nor received unauthorized assistance on this test:
Signature: ________________________________________________
, Section 1: True/False (2 points each, 20 points total)
Enter T for True or F for False before each statement.
__T__ 1. It is possible to determine accurately the density of a piece of an unidentified
material even if the volume is not known.
__F__ 2. Glasses and ceramics generally have similar crystal structures and properties.
Glasses do not have crystal structures (by definition).
__T__ 3. In elastic deformation, the stored elastic energy per unit volume of a material is
proportional to the square of the stress.
__F__ 4. The elastic modulus of a material depends on the applied stress. The elastic modulus
is a material property that is independent of the applied stress.
__F__ 5. The density of a pure element can be accurately calculated as long as the atomic
mass and the crystal structure are known. The atomic radius is also needed.
__T__ 6. The low elastic modulus of a thermoplastic polymer is related to the low stiffness of
intermolecular bonds between the polymer chains.
__T__ 7. Thermoset polymers and elastomers are always amorphous (non-crystalline).
__F__ 8. The minimum elastic modulus of a composite containing aligned fibers can be
determined by the rule of mixtures.
__F__ 9. The density of a closed cell foam measured using the double weighing method will be
higher than the density of an open cell foam if the volume fraction of pores is the same
in both cases. The density is equal if the volume fraction of pores is the same.
__T__ 10. The FCC crystal structure contains 4 octahedral interstitial sites in its unit cell.
