25) How is material hardness tested, and what are typical units of harness (ther

Question

25) How is material hardness tested, and what are typical units of harness (there is more than 1)?

26) What are two common features of most modern plastics?

A. Good electrical conductors, higher tension strength than compression strength (anisotropic)

B. Poor thermal conductors, can be easily injection molded

C. Unable to be machined, excellent thermal conductors

D. Excellent grain alignment when inside magnetic fields, become softer at very low temperatures

10) Which one IS a typical quality of a metal?

do not generally make electrons available via bonds

excellent electrical insulator

gas at room temperatures

excellent thermal conductor

27) During cold forming, a metal is pressed beyond the ___ & into the ___ region on the stress/strain curve.

A. Fracture point, zero strain

B. Yield point, inelastic

C. Inelastic range, super-critical

D. Zero strain, Zero yield

28) When a solid metal sphere is heated, the sphere’s _______ typically increases.

A. density

B. electrical conductivity

C. physical size

D. hardness

q) ____ is the alloying element on which ferrous metallurgy is based.
A. Copper
B. Aluminum
C. Iron
D. none of the above

7) Which periodic table property MOST determines an elements willingness to react?

1) the column

2) the row

3) the alphabetical order of the element’s first letter

4)the atomic weight

8) Based on the previous question, what is the main reason for this reactivity?

A) A higher number of protons make elements unstable, and more likely to react

B) A lower number of neutrons than protons make elements unstable and more likely to react

C) An unfilled outer valence shell of electrons make the atom more likely to react with ionic bonds

D A gaseous element is ALWAYS more likely to react with another element than metals/liquids

16) Give 3 examples of alloyed metals which resist corrosion to moisture?

3) The atomic mass of an electron is roughly ____________ times smaller than the mass of a neutron.

Explanation / Answer

25. material hardness is tested by using durometer test or rockwell hardness test. the higher the number the greater the resistance.generally it is the measure of resistance.

26.B

10. excellent thermal conductors

27.B

28.C (volume increases)

q.C.

7.1

8.A

16.Nickel alloys,Nickel copper alloys and Nickel chromium alloys

3.2000

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