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WorksheetsForensic Analysis of Glass
Total questions: 35
Worksheet time: 21mins
Name
Class
Date
1.
Glass which is strengthened by introducing stress through rapid heating and cooling of it's surface.
a)
Soda Lime Glass
b)
Leaded Glass
c)
Tempered Glass
d)
Laminated Glass
2.
When a bullet penetrates a panel of glass, it leaves a crater shaped hole that
a)
is wider on the entrance side
b)
is smaller on the entrance side
c)
Forms randomly
d)
Both B & C
3.
The fracture pattern of glass usually has
a)
Radial and concentric lines
b)
Concentric lines
c)
Radial lines
d)
Directional lines
4.
In reference to the diagram, line 1 is known as __________, and line 2 is known as ___________.
a)
Radial and concentric
b)
Radial and directional
c)
Concentric and directional
d)
Concentric and Radial
5.
Which glass break was made first?
a)
A
b)
B
6.
What type of fracture is this?
a)
Becke
b)
Conchodial
c)
Concentric
d)
Radial
7.
What will NOT be visible if a glass and a liquid has the same refractive index?
a)
Conchoidal Lines
b)
Becke Lines
c)
Fracture Lines
d)
Radial Lines
8.
What type of fracture forms on the same side as the impact?
a)
Radial
b)
Becke
c)
Concentric
d)
Conchodial
9.
Which type of glass fractured this way?
a)
tempered (auto)
b)
window
c)
crystal
d)
Pyrex
10.
Because glass is a solid with random arrangement of motionless atoms, it is called:
a)
plasma
b)
obtuse
c)
amorphous
d)
frozen
11.
Which of these is part of using the 3R rule to determine the direction of impact?
a)
radial crack
b)
right angle
c)
reverse side of force
d)
all of these
12.
A crack in glass that moves outward from the point of impact like spokes on a wheel is called a:
a)
compound fracture
b)
concentric fracture
c)
spoke fracture
d)
radial fracture
13.
The bright halo that appears near the border of a glass particle that is immersed in a liquid of a different refractive index is called the:
a)
border line
b)
refractive line
c)
Becke line
d)
immersion line
14.
The ratio of velocity of light in a vacuum to that in another medium (like water) is called the:
a)
birefringence
b)
refractive index
c)
refractive quotient
d)
comparison index
15.
Bending of light waves as they change velocity is called:
a)
reflection
b)
mirroring
c)
refraction
d)
transversing
16.
What is the main ingredient in ordinary glass?
a)
(a) soda
b)
(b) lime
c)
(c) metal oxides
d)
(d) sand
17.
A high-velocity projectile, such as a bullet, will often leave a round, crater-shaped hole that is surrounded by a nearly symmetrical pattern of radial and concentric cracks
a)
True
b)
False
c)
Maybe
18.
A fracture in glass always terminates at an existing line of fracture
a)
True
b)
False
c)
Maybe
19.
The examination of physical evidence, such as glass, may serve to prove the guilt of an individual but has limited ability in exonerating an innocent individual.
a)
True
b)
False
c)
Maybe
20.
The thickness of glass may help determine the shape of the glass.
a)
True
b)
False
c)
Maybe
21.
The collection process will usually start with the collection of the most fragile or most easily lost evidence.
a)
True
b)
False
c)
Maybe
22.
If a glassmaker adds sodium carbonate (washing soda) into a mixture it will lower both the viscosity and the melting point.
a)
True
b)
False
c)
Maybe
23.
Glass fragment comparison is the comparison of two or more glass fragments in an attempt to determine if they originated form different sources.
a)
True
b)
False
c)
Maybe
24.
If the density of a solid is greater than the liquid medium in which it is immersed, the object will:
a)
float
b)
suspend in the medium
c)
sink
d)
lose density
25.
In examining the stress marks on the edge of a radial crack near the point of impact, the perpendicular end is always found to be:
a)
located on the same side from which the force of impact was applied
b)
located parallel to the cracke from which the force of impact was applied
c)
located at a 90 degree angle from which the force of impact was applied
d)
located opposite the side from which the forece of impact was applied
26.
What type of elements can give glass a specific color?
a)
metal
b)
gas
c)
liquid
d)
radioactive
27.
Different ____ can impart different properties of glass
a)
additives
b)
alpacas
c)
smells
d)
shapes
28.
A significant difference in either density or refractive index proves that the glasses examined do not have a common _________
a)
color
b)
origin
c)
shape
29.
What does PCA stand for?
a)
Pacific Coast Academy
b)
Panama City Authorities
c)
Principal Component Analysis
d)
Proper Computer Analysis
30.
All glass at the crime scene should be
a)
thrown away
b)
collected
c)
crushed
d)
burnt
31.
Immersion Method is
a)
used to determine a glass fragment's refractive index
b)
used to determine a glass fragment's density
c)
used to analyzed the radial and concentric fracture patterns in glass
32.
A property of matter that depends on both the mass of a substance and the effects of gravity on that mass.
a)
density
b)
mass
c)
weight
d)
force
33.
measurement of how much matter is in an object
a)
mass
b)
force
c)
weight
d)
density
34.
A physical property of matter that is equivalent to the mass per unit volume of a substance.
a)
mass
b)
weight
c)
density
d)
force
35.
Glass bends in response to any ________.
a)
fracture
b)
weight
c)
density
d)
force
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