The property of being liquefied due to heat is known as ______

a) stress

b) contraction

c) normalizing

d) fusibility

3. Hardness is inversely proportional to strength.

a) True

b) False

4. Which of the following property of a material is preferred in the construction of an aircraft?

a) Ductility

b) Elasticity

c) Hardness

d) High density

5. What is the temperature at which steel fuses?

a) 1100F

b) 200K

c) 2500F

d) 3500F

6. Why do metals contract and expand?

a) Due to cooling and heating

b) Due to displacement

c) Due to repairs

d) Due to false recognition

7. A material elongated to 35m due to certain conditions. If it's initial length is 7m, what is the strain of the material?

a) 21m

b) 5m

c) 7m

d) 35m

8. The tendency of a material to fracture without changing it's shape is known as ______

a) brittleness

b) hardness

c) elasticity

d) carburizing

9. Steel is one of the few materials that has a definite yield point.

a) True

b) False

10. If a material is loaded beyond its elastic limit _________

a) it returns back to it's original shape

b) it acquires softness

c) it is permanently distorted

d) it turns to liquid

11. The property of a material involving transmitting of heat or electricity is known as _________

a) expansion

b) stress

c) contraction

d) conduction

12. The load obtained in a tension test is 500N and the original cross sectional area is 250m2what is the tensile strength of the material?

a) 5 m

b) 25 N/m2

c) 2 N/m2

d) 20 m

13. The modulus of elasticity of a material can be described as ________

a) the product of stress and strain

b) the ratio of stress to strain

c) the product of yield point and strain

d) the ratio of change in length to original length

14. The ability of a material to resist permanent distortion or penetration is called as _______

a) hardness

b) yield point

c) malleability

d) elongation

15. What is the total permissible elongation for a gage length of 5.08cm?

a) 5080 cm

b) 0.00508 cm

c) 0.508 cm

d) 0.000508 cm