Final

Question 1

The concept of an atom is 1 hundred years old?

Answer 1

False: several thousands

Question 2

Robert brown came up with the idea that atoms vibrate.

Answer 2

True: Brownian motion

Question 3

All materials burn at the same color

Answer 3

False: It depends on the atom

Question 4

The number of electrons equal the number of neutron.

Answer 4

False: protons

Question 5

Aluminum is a solid.

Answer 5

False: an Amorphous liquid

Question 6

A crystal is a ionic bond.

Answer 6

False: coordinate covalent bond

Question 7

Metals are usually single elements.

Answer 7

False: usually alloys

Question 8

Specific gravity is the density of a material divided by the density of the weight. A comparison to the specific gravity of water.

Answer 8

True

Question 9

Pure metal has a specific melting point you can look up.

Answer 9

True

Question 10

Specific heat is the amount of calories you have to add to raise the material up by one degree of heat.

Answer 10

True

Question 11

Silver is a better conductor of heat than aluminum

Answer 11

True

Question 12

Silver conducts heat better than steel.

Answer 12

True

Question 13

Thermoexpansion is how much something expands to heat.

Answer 13

True

Question 14

All materials expand through thermoexpansion.

Answer 14

False: Antimonie contracts

Question 15

A good conductor of electricity is not a good conductor of heat

Answer 15

False: A good conductor of heat is a good conductor of electricity

Question 16

Copper is a good conductor of electricity and heat

Answer 16

True

Question 17

Crystalline structure of a material determines the corrosion resistance of the material.

Answer 17

False: The chemical makeup

Question 18

Adding a lot of carbon to steel increases the temperature to freeze it.

Answer 18

False: it goes down

Question 19

If you add 1 degree of carbon the temperature to freeze steel increases.

Answer 19

True

Question 20

Tensile strength is the ability of a material to push together

Answer 20

False: Stretch apart

Question 21

Yield strength is the force to deform a material

Answer 21

True

Question 22

Fracture strength is the force required to break a material.

Answer 22

False: The ability to break a material divided by the cross sectional area.

Question 23

Ductility is the percent of elongation and percent of material that elongates in two inches of pull

Answer 23

True

Question 24

Hardness is resistance to indenting

Answer 24

True

Question 25

Compression strength is the resistance to compression

Answer 25

False: and stressing (push or pull)

Question 26

Cooling steel produces ferret, perlite, and cementite crystalline structures.

Answer 26

True

Question 27

Cooling steel slowly produces cementite and ferret structures.

Answer 27

False: cementite and perlite

Question 28

Cementite is made of iron-carbon

Answer 28

True

Question 29

Sulfur is always in carbon-steel

Answer 29

True

Question 30

An alloy of steel contains chrome.

Answer 30

False: contains 1.65 percent manganese or .6 percent copper.

Question 31

Annealing steel requires heating the material above critical range then cooling the material slowly.

Answer 31

True

Question 32

An ossetintite structure is produced when annealing steel and is very sturdy.

Answer 32

False: Malleable

Question 33

Perlite is a combination of ferret and concretite.

Answer 33

False: ferret and cementite

Question 34

Ferret has oxygen in it.

Answer 34

True: iron oxide

Question 35

Tempering steel requires heating the material below the transformation range.

Answer 35

False: above

Question 36

Ferret steel contains chromium and carbon

Answer 36

True

Question 37

Osstenthetic steel is the same as ferretic steel.

Answer 37

False: It has nickel in it

Question 38

Martenistic steel has lower carbon then ferretic steel.

Answer 38

False: Higher carbon

Question 39

You cannot weld cast iron

Answer 39

False: you can

Question 40

The first two digits on steel is the percent of carbon

Answer 40

False: The alloy

Question 41

The second two digits on steel is the percent of carbon

Answer 41

True

Question 42

A bolt with three lines on top is medium carbon steel

Answer 42

True

Question 43

A black bolt is high carbon steel

Answer 43

True

Question 44

No lines on a bolt is medium carbon steel.

Answer 44

False: Low carbon

Question 45

A bolt with 10.9 is low carbon steel.

Answer 45

False: medium carbon steel

Question 46

You can make aluminum stronger by hot rolling the aluminum.

Answer 46

False: cold rolling

Question 47

You can drill, mill, and bend casting alloys of aluminum.

Answer 47

False: They will break

Question 48

The first number on aluminum tells you the percent of aluminum in it.

Answer 48

True

Question 49

A 1 on aluminum is telling you that the material is 99 percent or greater of aluminum.

Answer 49

True

Question 50

A 2 as the first number on aluminum tell you that it has zinc in it.

Answer 50

False: Not zinc

Question 51

The danger of drilling steel fast is the effect of anneeling occuring on the material.

Answer 51

True: it will make the material weaker

Question 52

Plastics are polymers of carbon and are malleable.

Answer 52

True

Question 53

Plastics are classified using structure and backbone polymer or side chains.

Answer 53

True

Question 54

Thermoplastics change chemical structure when they are heated.

Answer 54

False: They do not change

Question 55

Polypropylene will change its chemical structure when heated.

Answer 55

False: It is a thermoplastic

Question 56

Polypropylene and nylon have the same chemical structure.

Answer 56

False: Nylon has nitrogen in it.

Question 57

The ways to remove heat from the body are radiation, evaporation, conduction, convection, and behavioral adaption.

Answer 57

True

Question 58

Apocrine sweat glands release oils.

Answer 58

True

Question 59

The best way for your body to release heat is convection.

Answer 59

False: Radiation

Question 60

The best material for your body is a wicking material like synthetic cotton blends.

Answer 60

True

Question 61

Fiberglass makes a strong tensile strength material.

Answer 61

True