question

Which microscope plots an absorption spectrum of the item under examination?

answer

microspectrophotometer

question

When forensically comparing hair, it is important to have a representative (or standard) sample to compare against. For head hair, ho many hairs should be collected for a representative sample

answer

Fifty full-length hairs from all areas of the scalp

question

automobile paints are generally composed of four layers. the layer consisting of epoxy-modified polyesters that smooth out and hide any seams or imperfections is called the

answer

primer surfacer

question

in the diagram shown below one of the basic scale patterns of hair. the scale pattern is

answer

coronal

question

gunshot residue is often analyzed using a microscope. typically, the microscope has an x-ray analyzer attached to it so that the elemental composition of the residue can be determined. The microscope used to do this is the

answer

scanning electron microscope

question

which microscope is best suited to the study of birefringent minerals and fibers?

answer

polarizing microscope

question

many samples of physical evidence are materials that are sensitive to heat. For example, organic explosive residues and certain drugs (such as LSD) are heat sensitive. Which chromatographic process would be the best technique to analyze organic explosives and heat sensitive drugs?

answer

high-pressure liquid chromatography (HPLC)

question

Gas chromatography suffers a big drawback in that it does not produce specific identification of a compound. This problem is overcome by connecting the GC to a

answer

mass spectrometer

question

(look at example) the part labeled B points

answer

body tube

question

the line labeled C points to a

answer

objective lense

question

the part labeled A points to the

answer

ocular lense

question

the line labeled D points to a

answer

stage

question

(look at diagram) shown below is a spectrum of heroin. What type of spectrum is it?

answer

infrared (IR) spectrum

question

A parfocal microscope

answer

allows for ease of focus when switching from low to high power

question

A particularly invaluable technique for distinguishing most paint formulas is

answer

pyrolysis gas chromatography

question

**which of the following cannot be determined from microscopic examination of hair

answer

age of an individual

question

The book fatal vision chronicled a famous investigation dealing with a 1979 crime that involved Jeffrey McDonald, a military physician. He was accused of

answer

killing his wife and two daughters

question

in his defense Jeffery McDonald, a military physician, claimed that

answer

four intruders committed the crime he was accused of.

question

as magnification of the compound microscope increased, the depth of field

answer

is decreased

question

which microscope has the largest working distance and thus is useful for the examination of bulky items such as paint, soil, marijuana?

answer

stereoscopic microscope

question

which property imparts paint with its most distinctive forensic characteristic?

answer

color-layer sequence

question

(gas chromatograph) the part labeled in 4 in the diagram above is called the

answer

column

question

gas chromatographs are use to seperate the components of a mixture. the part where the separation occurs is the part numbered

answer

4 (column)

question

in the diagram above there is a box drawn around the part numbered 4. the box represents a

answer

oven

question

tests used to identify specific illegal drugs or substances by the color and morphology of the crystals formed when the substance is mixed with specific reagents are known as

answer

microcrystalline tests

question

(look at picture) given the cross-section of hair shown below, the most likely racial origin is

answer

asian origin

question

the medullary index can be used to determine whether a hair is of animal or human origin. for humans, the index is

answer

generally less than one-third

question

automobile paints are generally composed of four layers. the layer consisting of epoxy-modified polyesters that smooth out and hide any seams or imperfections is called the

answer

basecoat

question

in which stage of hair growth doe stye hair generally fall from the scalp

answer

telegon

question

in the diagram shown below one of the basic scale patterns of hair. the scale pattern is

answer

imbricate

question

nuclear DNA typing can be most successfully accomplished on hairs that have been removed during which stage of growth

answer

anagen

question

pigment granules that impart hair color are found in the

answer

cortex

question

(diagram) the point labeled A is the

answer

cuticle

question

the point labeled C is the

answer

medulla

question

when hair is forcibly removed, a translucent piece of tissue surrounding the hair's shaft near the root may be present. this is shown as the

answer

follicular tag

question

Wayne Williams, the Atlantic child murder, was convicted of murdering 2 young men, but it was though that he was responsible for the murder of

answer

28 male and 2 female african american children

question

Wayne Williams conviction was unique because it was based primarily on

answer

fiber evidence found several of the victims.

question

although there was no apparent connection between Wayne Williams and the victims, he was connected with the case when

answer

a police offer heard a \"splash\" in a river at a stakeout.

question

although a flaming fire can be supported only by gaseous fuel, it some instances a fuel can burn without the presence of a flame. this known as

answer

glowing compulsion

question

the amount of heat evolved when a substance is burned in oxygen is the heat

answer

heat of combustion

question

The diagram shown below was drawn in class. It show the interaction of fuel with oxygen and varying distances

answer

...

question

which microscope is best suited to the study of birefringent minerals and fibers?

answer

polarizing microscope.

question

when forensically comparing hair, it is important to have representative sample to compare against. For head hair, how many hairs should be collected for a representative sample?

answer

fifty full-length hairs from all areas of the scalp.

question

one of the common methods for identifying fibers is by measuring its

answer

refractive index

question

a microscopic characteristic of a fiber that is used for comparison is

answer

all of the above

question

the minimum temperature at which a liquid fuel will produce enough vapor to burn is called the

answer

flash point

question

pigments granules that impart hair color are found in the

answer

cortex

question

which of following is regenerated fiber?

answer

triacetate

question

automobile paints are generally composed of four layers. the layer consisting of epoxy-modified polyesters that smooth out and hide any seams or imperfections is called the

answer

primer surfacer

question

which type of spectroscopy is a rapid and reliable method for identifying the generic class of fiber?

answer

gas chromatographic spectroscopy.

question

in which stage of hair growth does the hair generally fall from the scalp

answer

telegon

question

for automobile paint, the layer that gives the paint its color is the

answer

basecoat

question

by far the most prevalent plant fiber, which makes its evidential value almost meaningless, is

answer

cotton

question

since 1995 the royal Canadian mounted police forensic labs have been systematically gathering color and chemical information on automotive paints. the data base is known as

answer

PDQ

question

which of the following is a synthetic fiber?

answer

nylon

question

when hair is forcibly removed, a translucent piece of tissue surrounding the hair's shaft near the root may be present. this is known as the

answer

follicular tag

question

the concentrations at which a vapor-to-fuel mixture in the air is capable of burning is referred to as the

answer

flammable range

question

although a flaming fire can be supported only by gaseous fuel, it some instances a fuel can burn without the presence of a flame. this is known as

answer

oxidative decomposition

question

part of the evidence that was used to convict jeffrey mcdonald was

answer

81 blue fibers from a pajama top

question

in his defense jeffrey mcdonald, a military physician, claimed that

answer

four intruders committed the crime of which he was accused.

question

the book fatal vision chronicled a famous investigation dealing with 1979 crime that involved jeffrey mcdonald, a military physician. he was accused of

answer

killing his wife and two daughters

question

the minimum temperature at which fuel will spontaneously ignite is called the

answer

ignition temperature

question

synthetic fibers that are composed of a large number of atoms arranged in repeating units. the repeating units are called

answer

polymers

question

synthetic fibers are often composed of large number of atoms arranged in repeating units. the repeating units are called

answer

monomers

question

the primary suspect in the Atlanta child murders was

answer

wayne williams

question

the Atlanta child murders involved the murder of

answer

28 african americans males and 2 african americans females

question

ultimately the suspect was convicted of killing

answer

two adult male ex-convicts

question

the event that led police to the suspect in the Atlanta child murders was

answer

a splash in a river below a bridge

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