Chapter 8 PCC 274 questions well answered 2023 passed

Chapter 8 PCC 274b. Is smooth without the grooves and lands found in rifles The barrel of a shotgun: a. Is indistinguishable from that of a rifle. b. Is smooth without the grooves and lands found in rifles. c. Is generally shorter than that of a rifle. d. Is wider at the end to concentrate shot. a. Bullet will be made to spin and have a true and accurate course on leaving the barrel The reason grooves are rifled into the bore of a gun is so that a: a. Bullet will be made to spin and have a true and accurate course on leaving the barrel. b. Bullet moving through will have unique striations. c. Manufacturer can put its unique mark on its product. d. Bullet will be reduced in size before it exits the gun. d. All of the above The comparison of two bullets is possible with the comparison microscope. Such a study is made difficult by the fact that: a. Lands and grooves are subject to wear and tear and hence striations markings are susceptible to continuing change. b. Often evidence bullets are distorted on impact and only small areas are found with intact markings. c. The presence of grit and rust can to some degree alter the markings on bullets fired through the same barrel. d. All of the above a. Directly related Generally, the gauge of a shotgun is _____ to the diameter of its barrel. a. Directly related b. Not related c. Indirectly related d. None of the above d. All of the above Distinctive markings of shells and cartridges can be made by the: a. Extractor and ejector mechanism. b. Firing pin. c. Breech face mark. d. All of the above c. A database for firearm evidence NIBIN is/are: a. Trade groups of firearms manufacturers. b. Safety education courses for firearm use. c. A database for firearm evidence. d. Lists of licensed gun dealers. c. Directly related Generally speaking, the amount of gun powder particles found around a bullet hole is _____ to the distance from which the weapon was fired. a. Indirectly related b. Not related c. Directly related d. None of the above c. both a and b Gun powder residue patterns can be detected by: a. The Greiss Test. b. IR photograph. c. Both a and b d. Neither a nor b b. greater than 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. a. The same as b. Greater than c. Less than d. None of the above b. Chocolate 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? a. Tobacco b. Chocolate c. Urine d. Cosmetics b. Less than 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. a. The same as b. Less than c. Greater than d. None of the above b. SEM primer residue detection Which technique of detecting GSR holds the most promise for the immediate future? a. Infrared spectroscopy b. SEM primer residue detection c. Neutron activation analysis d. Dermal nitrate test a. A greater rate 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. a. A greater rate b. The same rate c. A slower rate d. None of the above d. The edge of the trigger guard or by the checkered portion of the grip To prevent the disturbance of latent fingerprints on a firearm, the weapon should be lifted by: a. Inserting a pencil into the barrel b. Using disposable forceps c. The outside of the barrel or the trigger d. The edge of the trigger guard or by the checkered portion of the grip a. Transported to the crime lab in a container with enough of the same water necessary to keep it submerged When a gun is recovered from an underwater location, it should be: a. Transported to the crime lab in a container with enough of the same water necessary to keep it submerged. b. Placed in an air-tight plastic bag. c. Cleaned and dried. d. Submitted to the crime lab in a paper bag. c. Striation markings Discharged evidence bullets must be carefully handled to avoid damage to the: a. Manufacturer's imprint. b. Caliber markings. c. Striation markings. d. Ejection pattern. c. Taking a photograph and cast of the marks if necessary Tools and tool marks are often found at burglary scenes and can be useful evidence. Proper evidence collection by the field investigator would include: a. Reporting whether a tool found at the crime scene fit into the tool marks. b. Making test marks with the suspected tool onto a soft metal surface at the crime scene. c. Taking a photograph and cast of the marks if necessary. d. Packing of tool and tool mark evidence together so that the crime lab personnel know they are thought to be a matched set. d. An electrostatic lifting device Two-dimensional imprints found at a crime scene can be lifted using: a. Photographic paper. b. A silicone casting medium. c. A scanning electron lifter. d. An electrostatic lifting device. a. Photographing and casting with dental stone Shoe and tire marks impressed into soft Earth can be best preserved by: a. Photographing and casting with dental stone. b. Photographing and then use of the electrostatic lifting technique. c. Casting with dental stone and then attempting the electrostatic lift technique. d. Both a and b a. Wear marks Which is NOT a class characteristic of a suspect's sneaker? a. Wear marks b. Brand c. Color d. Size