Forensics Final Exam Questions And Answers 100% Pass
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Forensics
Forensics Final Exam Questions And
Answers 100% Pass
Lands - answerThe original part of the bore left after rifling grooves are formed are called the
___________.
caliber - answerThe diameter of a gun barrel is known as its _____________.
class - answerThe number lands and grooves is a _______...
Forensics Final Exam Questions And
Answers 100% Pass
Lands - answer✔The original part of the bore left after rifling grooves are formed are called the
___________.
caliber - answer✔The diameter of a gun barrel is known as its _____________.
class - answer✔The number lands and grooves is a ____________ characteristic of a barrel.
individual - answer✔The ___________________ characteristics of a rifled barrel are formed by
striations impressed into the barrel's surface.
comparison microscope - answer✔The most important instrument for comparing bullets is the
_____________ _________________. It is an indispensable tool for the firearm examiner
because it allows 2 bullets to be observed and compared simultaneously.
striations - answer✔To make a match between a test bullet and a recovered bullet, the lands and
grooves of the test and evidence bullet must have identical widths, and the longitudinal
_______________ on each must coincide.
False - answer✔True or False: It is always possible to determine the make of a weapon by the
bullet it fired.
smooth - answer✔A shotgun has a _________________ barrel without the lands and grooves
found in a rifle.
gauge - answer✔The _________ of a shotgun is directly related to the diameter of its barrel.
cannot - answer✔Shotgun pellets ___________ be individualized to a single weapon.
single - answer✔A cartridge case can be individualized to a ___________ weapon.
NIBIN - answer✔The automated firearms search system developed by the FBI and ATF as a
unified system incorporating both DRUGFIRE and IBIS technologies available in prior years is
known as _______________.
distance - answer✔The distribution of gunpowder particles and other discharge residues around a
bullet hole is directly related to the _____________ from which the gun was fired.
False - answer✔True or False: Without the benefit of a weapon, an examiner can make an exact
determination of firing distance.
12 - 18 - answer✔A halo of vaporous lead (smoke) deposited around a bullet hole normally
indicates a discharge ______ - ______ inches from the target.
bullet wipe - answer✔If a firearm has been fired more than 3 feet from a target, usually no
residue is deposited but a dark ring , known as ___________ _________, is observed.
yard - answer✔As a rule of thumb, the spread in the pattern made by a 12-gauge shotgun
increases 1 inch for every _________ of distance from the target.
infrared - answer✔A __________ photograph may help visualize gunpowder deposits around a
target.
Greiss - answer✔The ________ test is a method for locating powder residue involves
transferring particles embedded on the target surface to chemically treated gelatin-coated
photographic paper. It can reveal whether powder residues from a gunshot are present and can
also help determine the distance from the shooter to the target.
gunpowder; primer - answer✔Current methods for identifying a shooter rely on the detection of
____________ and ______________ residues on the hands.
barium; antimony - answer✔Determining whether an individual has fired a weapon is done by
measuring the elements ______________ and ____________ present on the hands.
nitric - answer✔Firings with all types of ammunition can be detected by hand swabbings with
________ acid.
scanning electron - answer✔Microscopic primer and gunpowder particles on the adhesives
applied to a suspected shooter's hand can be found with a _____________ _____________
microscope.
strain - answer✔Restoration of serial numbers is possible because in the stamped zone the metal
is placed under a permanent __________ that extends beneath the original numbers.
pencil - answer✔An investigator would not pick up a weapon by its barrel with a __________ or
stick in order to protect fingerprints because this may disturb powder deposits, rust, or dirt
lodged in the barrel, and consequently may alter the striation markings on test-fired bullets.
base; nose - answer✔Recovered bullets are initialed on either the ____________ or
___________ of the bullet.
intact - answer✔Because minute traces of evidence such as paint and fibers might be adhering to
a recovered bullet, the investigator must take care to leave these trace materials ___________.
False - answer✔True or False: Cartridge cases are best marked at the base of the shell.
powder residues - answer✔The clothing of the victim of the shooting must be handled so as to
prevent disruption of ____________ _____________ around bullet holes.
tool mark - answer✔A _______ _________ is any impression, cut, gouge, or abrasion caused by
a tool coming into contact with another object.
number - answer✔Tool marks compare only when a sufficient ___________of striations match
between the evidence and test markings.
cast - answer✔Objects bearing tool marks should be submitted intact to the crime lab or a
__________ should be taken of the tool mark.
portable electrostatic - answer✔An imprint may be lifted using lifting sheets or a ___________
_____________ lifting device.
photography; casting - answer✔Shoe and tire marks impressed into soft earth at a crime scene
are best preserved by ________________ and ______________.
individual - answer✔A wear pattern, cut, gouge, or other damage pattern can impart
________________ characteristics to a shoe.
SEM - answer✔The most promising technique of gunpowder residue detection for the immediate
future is _________ primer residue detection.
SEM; infrared - answer✔Gunpowder residue patterns can be detected by ________ and
_____________ photography (Geiss Test).
electrostatic - answer✔2- dimensional imprints at a crime scene can be lifted using an
_______________ lifting device.
striation markings - answer✔Discharged evidence bullets must be carefully handled to avoid
damage to the ____________ _______________ that are left on a bullet as it passes through the
barrel.
greater - answer✔Chokes are sometimes found on shotguns where they function to constrict the
end of the barrel. The speed and distance traveled by pellets fired from a narrow choke is
__________ than the speed and distance traveled by pellets fired from a shotgun with a wide
choke.
irregularities - answer✔Structural variations and ________________ caused by scratches, nicks,
breaks, and wear permit the criminalist to relate a bullet to a gun, a scratch or abrasion mark to a
single tool, or a tire track to a particular automobile.
rifling - answer✔The manufacture of a gun barrel requires impressing its inner surface with
spiral grooves, a step known as ___________.
barrels - answer✔No 2 rifled ____________ have identical striation markings.
twist - answer✔The number of lands and grooves and their direction of ___________ are
obvious points of comparison during the initial stages of an examination.
characteristics - answer✔Any differences in the __________________ imparted by the lands,
grooves, and their direction of twist eliminates the possibility that both bullets traveled through
the same barrel.
identical; coincide - answer✔Not only must the lands and grooves of the test and evidence bullet
have _______________ widths, but the longitudinal striations on each must also
__________________.
signature - answer✔The firing pin, breechblock, and ejector and extractor mechanism, the
magazine, the clip, and the fire chamber walls also offer a highly distinctive ____________ for
individualism of cartridge cases as they leave distinctive markings on the shell casing.
analogous - answer✔The advent of computerized imaging technology has made possible the
storage of bullet and cartridge surface characteristics in a manner ____________ to automated
fingerprint files.
criminalists - answer✔___________________ can restore serial numbers removed or obliterated
by grinding, rifling, or punching.
damage; wear - answer✔The shape and pattern of imperfections on tools are further modified by
__________ and ________ during the life of the tool.
chemical enhancement - answer✔In areas where a bloody footwear impression is very faint or
where the subject has tracked through blood, leaving a trail of bloody impressions,
_____________ ________________ can visualize latent or nearly invisible blood impressions.
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