FIS 205 Exam 3 questions well answered
to pass
impression evidence involves a donor and a... - correct answer ✔✔recipient (paint, putty,
plastics, soil, etc)
what type of impression is left on a clean surface? - correct answer ✔✔a positive impression
what is a negative impression? - correct answer ✔✔removes something from the surface (3d
impressions)
how many points need to be compared for impression evidence? - correct answer ✔✔no set
number
what type of casting is mostly commonly used? - correct answer ✔✔dental stone
dental stone - correct answer ✔✔-faster drying time
-more dense
-wax is used first in snow, then plaster is placed
what is the first step in the collection of impression evidence? - correct answer ✔✔take
photographs with and without a scale
how are tire tread impressions different than footwear impressions? - correct answer ✔✔the
size (uses same casting material and same order of collection)
, Does a toolmark make the same impression every time? - correct answer ✔✔no, they change
over time with use and wear
marks made by a lateral force parallel to the surface are - correct answer ✔✔striated marks
marks made by an above force perpendicular to the surface are - correct answer ✔✔impressed
marks
what chemical is used to restore serial numbers in metal? - correct answer ✔✔acid
an arrangement, orientation, or shape of macroscopic tool-mark features that are consistent
with a particular shape of tool surface is an example of what type of class? - correct answer
✔✔class characteristics (can't be used to determine if unique tool)
what is disrupted when the surface is stamped with an alphanumeric dye? - correct answer
✔✔the crystal structure (it can be restored, not a permanent change; firearms with restored
serial numbers cannot go back to owner)
What is ballistics? - correct answer ✔✔The study of bullet trajectory
What is rifling? - correct answer ✔✔the lands and grooves in a gun barrel
Striations, used to individualize a bullet to a firearm, are produced from what part of the
firearm barrel? - correct answer ✔✔the lands on the barrel of the firearm
grooves - correct answer ✔✔Spiral cuts in the bore of a barrel that give the bullet it's spin as it
moves down the barrel
lands - correct answer ✔✔the raised portion between the grooves in a rifled bore
to pass
impression evidence involves a donor and a... - correct answer ✔✔recipient (paint, putty,
plastics, soil, etc)
what type of impression is left on a clean surface? - correct answer ✔✔a positive impression
what is a negative impression? - correct answer ✔✔removes something from the surface (3d
impressions)
how many points need to be compared for impression evidence? - correct answer ✔✔no set
number
what type of casting is mostly commonly used? - correct answer ✔✔dental stone
dental stone - correct answer ✔✔-faster drying time
-more dense
-wax is used first in snow, then plaster is placed
what is the first step in the collection of impression evidence? - correct answer ✔✔take
photographs with and without a scale
how are tire tread impressions different than footwear impressions? - correct answer ✔✔the
size (uses same casting material and same order of collection)
, Does a toolmark make the same impression every time? - correct answer ✔✔no, they change
over time with use and wear
marks made by a lateral force parallel to the surface are - correct answer ✔✔striated marks
marks made by an above force perpendicular to the surface are - correct answer ✔✔impressed
marks
what chemical is used to restore serial numbers in metal? - correct answer ✔✔acid
an arrangement, orientation, or shape of macroscopic tool-mark features that are consistent
with a particular shape of tool surface is an example of what type of class? - correct answer
✔✔class characteristics (can't be used to determine if unique tool)
what is disrupted when the surface is stamped with an alphanumeric dye? - correct answer
✔✔the crystal structure (it can be restored, not a permanent change; firearms with restored
serial numbers cannot go back to owner)
What is ballistics? - correct answer ✔✔The study of bullet trajectory
What is rifling? - correct answer ✔✔the lands and grooves in a gun barrel
Striations, used to individualize a bullet to a firearm, are produced from what part of the
firearm barrel? - correct answer ✔✔the lands on the barrel of the firearm
grooves - correct answer ✔✔Spiral cuts in the bore of a barrel that give the bullet it's spin as it
moves down the barrel
lands - correct answer ✔✔the raised portion between the grooves in a rifled bore
