Ballistics & Impressions Test Review

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

• a bullet moving through will have unique striations

• the manufacturer can put its unique mark on the product

• the bullet will be made to spin and have a true and accurate course leaving the barrel

• all of the answer choices

The amount of gun powder found around a bullet hole is ___________ to the distance from which the weapon was fired.

• directly related

• indirectly related

• inversely related

• distance does not affect the amount of gun shot residue on a surface

How are ballistic specialists able to make a comparison among the minute details of two small bullets?

• by taking a photo and placing them alongside each other on a monitor

• using a comparison microscope

• using a hand lens

• it is impossible to compare two bullets

in general, the gauge of a shotgun is directly related to

• the length of the barrel

• the diameter of the barrel

• the lumen

• the type of metal the barrel contains

distinctive markings on shells of ammunition can be made by

• firing pin

• breechblock (breech face)

• extractor or ejector mechanism

• all of the answer choices

gun powder residue patterns can be detected by

• photography

• presumptive tests

• the greiss test

when a handgun is retreived from a body of water, how should it be transported?

• submitted to a crime lab in a paper bag

• cleaned and dried

• placed in an air-tight plastic bad

• transported in a container in water from where it was found

a large halo or stippling area from burned and unburned powder around a bullet hole indicates __________.

• the bullet was fired from less than 6 inches

• the bullet was fired from 12-18 inches

• the bullet was fired from a distance greater than 3 feet

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

• making test marks with the suspected tool onto a soft metal surface at the crime scene

• reporting whether a tool found at the scene fit into the tool marks

• packing of tool and tool mark evidence together so that the crime lab personnel knows that they are thoughts to be a matched set

• taking a photograph

the firing pin impression is the small dimple found on the primer of the gun

• true

• false