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Materials Science (2) A221

Total questions: 40

Worksheet time: 23mins

Name
Class
Date
1.

What type of crystal defect is this?

a)

vaccancy

b)

interstitial

c)

substitutional

d)

dislocation

e)

interfacial

2.

What type of crystal defect is this?

a)

vaccancy

b)

interstitial

c)

substitutional

d)

dislocation

e)

interfacial

3.

What type of crystal defect is this?

a)

vaccancy

b)

interstitial

c)

substitutional

d)

dislocation

e)

interfacial

4.

What type of crystal defect is this?

a)

vaccancy

b)

interstitial

c)

substitutional

d)

dislocation

e)

interfacial

5.

What type of crystal defect is this?

a)

vaccancy

b)

interstitial

c)

substitutional

d)

dislocation

e)

interfacial

6.

All of the following are examples of working a metal EXCEPT:

a)

pounding

b)

stamping

c)

melting

d)

rolling

7.

Which general size of crystals produce the most grain boundaries and therefore the most interfacial defects:

a)

small crystals

b)

large crystals

c)

both

8.

The metals that are the most workable have:

a)

no dislocations

b)

just a few dislocations

c)

a lot of dislocations

9.

The type of point defect that can move through a crystal structure through diffusion is known as (thing of the tile puzzle analogy):

a)

vacancy

b)

substitutional defect

c)

interstitial

10.

This type of force moves dislocations through a crystal:

a)

compression

b)

torsion

c)

tension

d)

shear

11.

A defect where atoms occupy the empty space between existing atoms within a crystal.

a)

point defect

b)

vacancy

c)

interstitial

d)

interfacial

e)

metal working

12.

A defect where two or more crystals grow together on their faces.

a)

point defect

b)

vacancy

c)

interstitial

d)

interfacial

e)

metal working

13.

A defect where single atoms are missing entirely from a crystal structure.

a)

point defect

b)

vacancy

c)

interstitial

d)

interfacial

e)

metal working

14.

Changing a metal’s shape while it remains a solid.

a)

point defect

b)

vacancy

c)

interstitial

d)

interfacial

e)

metal working

15.

A type of crystal defect where single atoms are affected.

a)

point defect

b)

vacancy

c)

interstitial

d)

interfacial

e)

metal working

16.

Manipulating a metal and moving its dislocations to strengthen the material.

a)

substitutional

b)

dislocation

c)

slip plane

d)

work-hardening

e)

grain boundary

17.

A defect where new atoms replace an existing atom within a crystal.

a)

substitutional

b)

dislocation

c)

slip plane

d)

work-hardening

e)

grain boundary

18.

Regions within a crystal where planes of atoms can slide past one another.

a)

substitutional

b)

dislocation

c)

slip plane

d)

work-hardening

e)

grain boundary

19.

The border where two crystal grains meet.

a)

substitutional

b)

dislocation

c)

slip plane

d)

work-hardening

e)

grain boundary

20.

Regions in crystals where atoms are not perfectly aligned due to the presence of an extra partial plane of atoms.

a)

substitutional

b)

dislocation

c)

slip plane

d)

work-hardening

e)

grain boundary

21.

In Gibbs phase rule (2+C=F+P), 2 in the equation implies which of the following two can be changed independently

a)

Pressure and Composition

b)

Pressure and Temperature

c)

Temperature and Composition

d)

None

22.

Degrees of freedom for a triple point on the phase diagram are

a)

0

b)

1

c)

2

d)

3

23.

Solvus is a line on the phase diagram which differentiates between

a)

a liquid and a solid

b)

different liquids

c)

different solids

d)

None

24.

Which one is a better design in dispersion strengthening?

a)

A

b)

B

c)

Both

d)

None

25.

Which one is a better design in dispersion strengthening?

a)

A

b)

B

c)

Both

d)

None

26.

Which one is a better design in dispersion strengthening?

a)

A

b)

B

c)

Both

d)

None

27.

The reaction in the figure is called

a)

Eutectic

b)

Peritectoid

c)

Monotectic

d)

Eutectoid

28.

Name the reaction marked in red on the figure

a)

Eutectoid

b)

Peritectoid

c)

Peritectic

d)

Eutectic

29.

Which of the following structure will form at the point marked as red on the figure

a)
b)
c)
d)
30.

Which one is the correct sequence of structure formation in age hardening?

a)
b)
c)
d)
31.

The structure of alpha ferrite is

a)

FCC

b)

BCC

c)

HCP

d)

None

32.

The structure of austenite is

a)

FCC

b)

BCC

c)

SC

d)

None

33.

The theoretical limit of carbon in iron for steel is

a)

0.08%

b)

0.11%

c)

2.11%

d)

2%

34.

Martensite is

a)

Soft

b)

Ductile

c)

Annealed

d)

Hard

35.

The diagram that describes the time required at any

temperature for a phase transformation to begin and end is called

a)

P-T diagram

b)

C-T diagram

c)

TTT diagram

d)

None

36.

Briefly explain conditions of atomic motion in diffusion and law that govern the diffusion.

4 lines
37.

TWO types of substitutional solid solution:

a)

First In First Out

b)

Fist In Last Out

c)

Disorderd / Randomly Arrage

d)

Ordered / Properly Arrange

38.

The diagram shows _________________________ .

a)

Metal liquifying process

b)

Metal solidification process

c)

Metal iron process

d)

Metal impurities process

39.

Edge dislocation imperfection is a sub type of _____________

a)

Point imperfections

b)

Line imperfections

c)

Volume imperfections

d)

Surface imperfections

40.

When a pair of cation and anion are missing in a crystal, it is called ____________.

a)

Vacancy defect

b)

Line imperfection

c)

Schottky’s defect

d)

Frenkel defect

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