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Forensic Science Chapter 8

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Forensic Science Mid Term chapter 8
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Resumo de Recurso

Questão 1

Questão
The barrel of a shotgun:
Responda
  • Is indistinguishable from that of a rifle
  • Is smooth without the grooves and lands found in rifles
  • Is generally shorter than that of a rifle
  • Is wider at the end to concentrate shot

Questão 2

Questão
The reason grooves are rifled into the bore of a gun is so that a:
Responda
  • Bullet will be made to spin and have a true and accurate course on leaving the barrel
  • Bullet moving though will have unique striations
  • Manufacturer can put its unique mark on its product
  • Bullet will be reduced in size before it exits the gun

Questão 3

Questão
The comparison of two bullets is possible with the comparison microscope. Such a study is made difficult by the fact that:
Responda
  • Lands and grooves are subject to wear and tear and hence striations markings are susceptible to continuing change.
  • Often evidence bullets are distorted on impact and only small areas are found with intact markings.
  • The presence of grit and rust can to some degree alter the markings on bullets fired through the same barrel.
  • All of the above

Questão 4

Questão
Generally, the gauge of a shotgun is _______ to the diameter of its barrel
Responda
  • Directly related
  • Not related
  • Indirectly related
  • None of the above

Questão 5

Questão
Distinctive markings of shells and cartridges can be made by the:
Responda
  • Extractor and ejector mechanism
  • Firing pin
  • Breech face mark
  • All of the above

Questão 6

Questão
NIBIN is/are:
Responda
  • Trade group of firearms manufacturers
  • Safety education courses for firearm use
  • A database for firearm evidence
  • Lists of licenses gun dealers

Questão 7

Questão
Generally speaking, the amount of gun powder particles found around a bullet hole is _____ to the distance from which the weapon was fired.
Responda
  • Indirectly related
  • Not related
  • Directly related
  • None of the above

Questão 8

Questão
Gun powder residue patterns can be detected by:
Responda
  • The Greiss Test
  • IR photograph
  • Both a and b
  • Neither a nor b

Questão 9

Questão
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 _____ the speed and distance traveled by pellets fired from a shotgun with a wide choke.
Responda
  • The same as
  • Greater than
  • Less than
  • None of the above

Questão 10

Questão
The “dermal nitrate test” has fallen into disfavor because of its lack of specificity. Which of the following common materials does NOT give a misleading positive reaction to this test?
Responda
  • Tobacco
  • Chocolate
  • Urine
  • Cosmetics

Questão 11

Questão
The likelihood of detecting GSR on swabs taken from living subjects more than six hours after a firing has occurred is _____ the likelihood of detecting GSR within two hours of a firing.
Responda
  • The same as
  • Less than
  • Greater than
  • None of the above

Questão 12

Questão
Which technique of detecting GSR holds the most promise for the immediate future?
Responda
  • Infrared spectroscopy
  • SEM primer residue detection
  • Neutrn activation analysis
  • Dermal nitrate test

Questão 13

Questão
When an etching agent is applied to a metal surface in order to restore a removed serial number the stamped area will dissolve at _____ as the unstamped area.
Responda
  • A greater rate
  • The same rate
  • A slower rate
  • None

Questão 14

Questão
To prevent the disturbance of latent fingerprints on a firearm, the weapon should be lifted by:
Responda
  • Inserting a pencil into the barrel
  • Using disposable forceps
  • The outside of the barrel or the trigger
  • The edge of the trigger guard or by the checkered portions of the grip

Questão 15

Questão
When a gun is recovered from an underwater location, it should be:
Responda
  • Transported to the crime lab in a container with enough of the same water necessary to keep it submerged.
  • Placed in an air-tight plastic bad
  • Cleaned and dried
  • Submitted to the crime lab in a paper bad

Questão 16

Questão
Discharged evidence bullets must be carefully handled to avoid damage to the:
Responda
  • Manufacturer's imprint
  • Caliber markings
  • Striation markings
  • Ejection pattern

Questão 17

Questão
Tools and tool marks are often found at burglary scenes and can be useful evidence. Proper evidence collection by the field investigator would include:
Responda
  • Reporting whether a tool found at the crime scene fit into the tool marks
  • Making test marks with the suspected tool onto a soft metal surface at the crime scene
  • Taking a photograph and cast of the marks if necessary
  • Packing of tool and tool mark evidence together so that the crime lab personnel know they are thought to be a matched set.

Questão 18

Questão
Two-dimensional imprints found at a crime scene can be lifted using:
Responda
  • Photographic paper
  • A silicone casting medium
  • A scanning electron lifter
  • An electrostatic lifting device

Questão 19

Questão
Shoe and tire marks impressed into soft Earth can be best preserved by:
Responda
  • Photographing and casting with dental stone
  • Photographing and then use of the electrostatic lifting technique.
  • Casting with dental stone and then attempting the electrostatic lift technique.
  • Both a and b

Questão 20

Questão
Which is NOT a class characteristic of a suspect’s sneaker?
Responda
  • Wear marks
  • Brand
  • Color
  • Size

Questão 21

Questão
Which of the following is not expected to show any evidential marks or impressions?
Responda
  • A fired bullet
  • A cartridge casing fired from a handgun
  • A cartridge casting fired from a shotgun
  • A shotgun pellet

Questão 22

Questão
Which of the following procedures is not to be followed in collecting and packaging firearms evidence at the crime scene?
Responda
  • Marking a fired bullet on its base for identification
  • Avoiding inserting a stick or pencil into the barrel of a weapon
  • Marking an empty cartridge case on its base for identification
  • Unloading a weapon before shipping it to the crime laboratory

Questão 23

Questão
Two elements detected on the hands of an individual who has recently fired a weapon are:
Responda
  • Zinc and copper
  • Antimony and barium
  • Barium and nitrates
  • Antimony and iron

Questão 24

Questão
Which of the following factors is least likely to be considered by the examining tool mark technician?
Responda
  • The direction of the tool movement as it passes over the surface
  • The side or portion of the tool making the impression
  • The brand name of the tool
  • The angle at which the tool was held

Questão 25

Questão
Which of the following results is not possible from a laboratory examination of firearm evidence?
Responda
  • Determining that two or more cartridge cases were fired from the same weapon
  • Determining how far from the victim the weapon was held
  • Restoring serial numbers ground off the gun
  • Identifying a bullet as having been combined with a particular shell prior to being discharged

Questão 26

Questão
Which of the following statements is true?
Responda
  • A bullet can be individualized to a weapon by the number and twist of its lands and grooves.
  • The comparison microscope is an indispensable tool of the firearm examiner.
  • The diameter of the bore of a rifled firearm is its gauge.
  • Carbonaceous smoke or soot deposited around a bullet hole is normally indicative of a discharge 12 to 18 feet or less from the target.

Questão 27

Questão
The presence of gunpowder residues on a garment whose color conceals the existence of the residue is best revealed by:
Responda
  • Infrared photography
  • Ultraviolet photography.
  • Color photography.
  • Infrared spectrophotometry.

Questão 28

Questão
Which of the following rifling methods is no longer in use?
Responda
  • The button method
  • The hook cutter method
  • The mandrel method
  • The broach cutter method

Questão 29

Questão
Which of the following makes the final determination about whether or not two bullets were fired by the same gun?
Responda
  • IBIS
  • A comparison microscope
  • NIBIN
  • A trained firearms examiner

Questão 30

Questão
The automated shoe print identification system is known as:
Responda
  • SICAR
  • NIBIN
  • ATF
  • IBIS

Questão 31

Questão
Dust imprints found at a crime scene can be lifted using:
Responda
  • Photographic paper
  • A silicone casting medium
  • A scanning electron lifter
  • An electrostatic lifting device

Questão 32

Questão
. A technique applicable for determining whether or not an individual has ¬recently fired a weapon is:
Responda
  • Neutron activation analysis
  • Atomic absorption analysis
  • The scanning electron microscope
  • All of the above

Questão 33

Questão
Objects bearing tool marks should either be submitted intact to the crime lab or a _____ should be taken of the tool mark.
Responda
  • Digital photograph
  • Film photograph
  • Black and white photograph
  • Cast

Questão 34

Questão
A wear pattern, cut, gouge, or other damage pattern can impart _____ characteristics to a shoe.
Responda
  • Class
  • Wear
  • Individual
  • Generic

Questão 35

Questão
An imprint may be lifted from a surface at a crime scene using:
Responda
  • Plaster of paris
  • Luminol
  • Imido black dye
  • An electrostatic lifting device

Questão 36

Questão
The distribution of gunpowder particles and other discharge residues around a bullet hole permits:
Responda
  • Determination of the distance from which the gun was fired.
  • Determination of the kind of firearm used.
  • Estimation of the angle of bullet impact.
  • Estimation of the height of the shooter.

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