Forensic Science Chapter 8

Question 1 of 36

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The barrel of a shotgun:

Select one of the following:

  • 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

Question 2 of 36

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The reason grooves are rifled into the bore of a gun is so that a:

Select one of the following:

  • 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

Question 3 of 36

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The comparison of two bullets is possible with the comparison microscope. Such a study is made difficult by the fact that:

Select one of the following:

  • 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

Question 4 of 36

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Generally, the gauge of a shotgun is _______ to the diameter of its barrel

Select one of the following:

  • Directly related

  • Not related

  • Indirectly related

  • None of the above

Question 5 of 36

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Distinctive markings of shells and cartridges can be made by the:

Select one of the following:

  • Extractor and ejector mechanism

  • Firing pin

  • Breech face mark

  • All of the above

Question 6 of 36

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NIBIN is/are:

Select one of the following:

  • Trade group of firearms manufacturers

  • Safety education courses for firearm use

  • A database for firearm evidence

  • Lists of licenses gun dealers

Question 7 of 36

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Generally speaking, the amount of gun powder particles found around a bullet hole is _____ to the distance from which the weapon was fired.

Select one of the following:

  • Indirectly related

  • Not related

  • Directly related

  • None of the above

Question 8 of 36

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Gun powder residue patterns can be detected by:

Select one of the following:

  • The Greiss Test

  • IR photograph

  • Both a and b

  • Neither a nor b

Question 9 of 36

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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.

Select one of the following:

  • The same as

  • Greater than

  • Less than

  • None of the above

Question 10 of 36

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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?

Select one of the following:

  • Tobacco

  • Chocolate

  • Urine

  • Cosmetics

Question 11 of 36

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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.

Select one of the following:

  • The same as

  • Less than

  • Greater than

  • None of the above

Question 12 of 36

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Which technique of detecting GSR holds the most promise for the immediate future?

Select one of the following:

  • Infrared spectroscopy

  • SEM primer residue detection

  • Neutrn activation analysis

  • Dermal nitrate test

Question 13 of 36

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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.

Select one of the following:

  • A greater rate

  • The same rate

  • A slower rate

  • None

Question 14 of 36

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To prevent the disturbance of latent fingerprints on a firearm, the weapon should be lifted by:

Select one of the following:

  • 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

Question 15 of 36

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When a gun is recovered from an underwater location, it should be:

Select one of the following:

  • 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

Question 16 of 36

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Discharged evidence bullets must be carefully handled to avoid damage to the:

Select one of the following:

  • Manufacturer's imprint

  • Caliber markings

  • Striation markings

  • Ejection pattern

Question 17 of 36

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Tools and tool marks are often found at burglary scenes and can be useful evidence. Proper evidence collection by the field investigator would include:

Select one of the following:

  • 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.

Question 18 of 36

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Two-dimensional imprints found at a crime scene can be lifted using:

Select one of the following:

  • Photographic paper

  • A silicone casting medium

  • A scanning electron lifter

  • An electrostatic lifting device

Question 19 of 36

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Shoe and tire marks impressed into soft Earth can be best preserved by:

Select one of the following:

  • 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

Question 20 of 36

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Which is NOT a class characteristic of a suspect’s sneaker?

Select one of the following:

  • Wear marks

  • Brand

  • Color

  • Size

Question 21 of 36

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Which of the following is not expected to show any evidential marks or impressions?

Select one of the following:

  • A fired bullet

  • A cartridge casing fired from a handgun

  • A cartridge casting fired from a shotgun

  • A shotgun pellet

Question 22 of 36

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Which of the following procedures is not to be followed in collecting and packaging firearms evidence at the crime scene?

Select one of the following:

  • 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

Question 23 of 36

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Two elements detected on the hands of an individual who has recently fired a weapon are:

Select one of the following:

  • Zinc and copper

  • Antimony and barium

  • Barium and nitrates

  • Antimony and iron

Question 24 of 36

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Which of the following factors is least likely to be considered by the examining tool mark technician?

Select one of the following:

  • 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

Question 25 of 36

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Which of the following results is not possible from a laboratory examination of firearm evidence?

Select one of the following:

  • 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

Question 26 of 36

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Which of the following statements is true?

Select one of the following:

  • 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.

Question 27 of 36

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The presence of gunpowder residues on a garment whose color conceals the existence of the residue is best revealed by:

Select one of the following:

  • Infrared photography

  • Ultraviolet photography.

  • Color photography.

  • Infrared spectrophotometry.

Question 28 of 36

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Which of the following rifling methods is no longer in use?

Select one of the following:

  • The button method

  • The hook cutter method

  • The mandrel method

  • The broach cutter method

Question 29 of 36

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Which of the following makes the final determination about whether or not two bullets were fired by the same gun?

Select one of the following:

  • IBIS

  • A comparison microscope

  • NIBIN

  • A trained firearms examiner

Question 30 of 36

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The automated shoe print identification system is known as:

Select one of the following:

  • SICAR

  • NIBIN

  • ATF

  • IBIS

Question 31 of 36

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Dust imprints found at a crime scene can be lifted using:

Select one of the following:

  • Photographic paper

  • A silicone casting medium

  • A scanning electron lifter

  • An electrostatic lifting device

Question 32 of 36

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. A technique applicable for determining whether or not an individual has ¬recently fired a weapon is:

Select one of the following:

  • Neutron activation analysis

  • Atomic absorption analysis

  • The scanning electron microscope

  • All of the above

Question 33 of 36

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Objects bearing tool marks should either be submitted intact to the crime lab or a _____ should be taken of the tool mark.

Select one of the following:

  • Digital photograph

  • Film photograph

  • Black and white photograph

  • Cast

Question 34 of 36

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A wear pattern, cut, gouge, or other damage pattern can impart _____ characteristics to a shoe.

Select one of the following:

  • Class

  • Wear

  • Individual

  • Generic

Question 35 of 36

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An imprint may be lifted from a surface at a crime scene using:

Select one of the following:

  • Plaster of paris

  • Luminol

  • Imido black dye

  • An electrostatic lifting device

Question 36 of 36

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The distribution of gunpowder particles and other discharge residues around a bullet hole permits:

Select one of the following:

  • 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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Forensic Science Chapter 8

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Forensic Science Mid Term chapter 8

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