question

Gunshot residue is often analyzed using a microscope. typically the microscope has an x-ray attached to it so elemental composition can be determined. the microscope to do this is... a) microspectrophotometer b) stereoscopic microscope c) polarizing microscope d) scanning electron microscope

answer

d

question

which is not one of the five color tests discussed in class to analyze drugs? a) scott test b) marquis test c) dequenois-levine test d) tollens test

answer

d

question

thin-layer chromatography uses _________ as its mobile phase to separate the components of a mixture a) carrier gas b) a liquid c) silica gel d) all of the above

answer

b

question

which microscope plots an absorption spectrum of the item under examination? a) stereoscopic microscope b) mass spec microscope c) polarizing microscope d) microspectrophotometer

answer

d

question

which microscope is best suited to the study of birefringent minerals and fibers? a) polarizing microscope b) compound microscope c) stereoscopic microscope d) comparison microscope

answer

a

question

which chromatographic process would be the best technique to analyze organic explosives and heat-sensitive drugs? a) high-pressure liquid chromatography (HPLC) b) pyrolysis gas chromatography c) paper chromatography d) gas chromatography-mass spectrometry

answer

a

question

in the case of the tylenol tampering case, the tylenol capsules were a) filled with potassium cyanide b) replaced with ecstacy capsules c) laced with cocaine d) soaked in LSD

answer

a

question

the case of the tylenol tampering took place in a) seattle b) san francisco c) chicago d) new york

answer

c

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 a) computer b) GRIM 3 c) high pressure liquid chromatograph d) mass spectrometer

answer

d

question

a chemical screening test that gives a purple color in the presence of heroin of morphine as well as most opium derivatives is the a) dillie-koppanyi test b) simon test c) van waters test d) marquis test

answer

d

question

a parfocal microscope a) has two ocular lenses b) requires a polarized light source c) allows ease of focus when switching from low to high power d) all of the above

answer

c

question

a particularly invaluable technique for distinguishing most paint formulas is a) thin-layer chromatography b) pyrolysis gas chromatography c) polarizing microscopy d) scanning electron microscopy

answer

b

question

a technique for separating molecules through migration on a support medium while under the influence of an electrical potential is called a) gas chromatography b) electrophoresis c) mass spectrometry d) microspectrophotometry

answer

b

question

electrophoresis can be used in the crime lab to analyze a) DNA b) fibers c) gunshot residue d) all of the above

answer

a

question

as magnification of the compound microscope is increased, the field of view a) is increased b) remains the same c) is decreased d) fluxuates

answer

c

question

drugs that have a high potential for abuse and no currently accepted medical use in the US, and/ or lack accepted safety use in the treatment under medical supervision such as heroin are considered to be a) schedule I drugs b) schedule II drugs c) schedule III drugs d) schedule IV drugs

answer

a

question

as magnification of the compound microscope is increased, the depth of field a) is increased b) remains the same c) is decreased d) fluxuates

answer

c

question

which microscope has the largest working distance and thus is useful for the examination of bulky items such as paint, soil, and marijuana? a) compound microscope b) comparison microscope c) polarizing microscope d) stereoscopic microscope e) dicks

answer

d

question

the refractive index of a substance varies with its a)temperature b)weight c)mass d)color

answer

a

question

the process of a glass prism separating sunlight into component colors is called A)refraction b)dispersion c)birefringence d)double refraction

answer

b

question

test used to identify specific illegal drugs or substances by the color and morphology of the crystal formed when the substance is mixed with specific reagents are known a) van urk test b)microcrystalline tests c)neutrons activation analysis d)high pressure liquid chromatography

answer

b

question

gas chromatographs are use to separate the components of mixture. the part where the separation occurs is the part numbered a)3 b)4. c)5. d)7.

answer

b

question

compounds, such as powdered sugar, which are inactive substances that are put in illicit drugs to used to increase the supply are called a)synthetics b)fillers c)excipients d)precursors

answer

c

question

which of the following is not an intensive property of matter? a)density b)weight c)refractive index d)color

answer

b

question

When forensically comparing hair, it is important to have a representative (or standard) sample to compare against. For head hair, how many hairs should be collected for a representative sample? a) Two, one from the top of the head and one near the base of the neck. b) Ten, from all areas of the head and neck c) Fifty full-length hairs from all areas of the scalp d) One hundred of variable length from all areas of the scalp.

answer

c

question

One of the common methods for identifying fibers is by measuring its? a) reflective magnitude b) refractive index c) density d) melting point

answer

b

question

The minimum temperature at which a liquid fuel will produce enough vapor to burn is called the ? a) flash point b) ignition temperature c) flammable range d) critical temperature

answer

b

question

A microscopic characteristic of a fiber that is used for comparison is a) cross-sectional shape b) diameter of the fiber c) striations on the surface d) all of the above

answer

d

question

Pigment granules that impart hair color are found in the a) cortical fusi b) cuticle c) cortex d) ovoid bodies

answer

c

question

Automobile paints are generally composed of four layers. The layer consisting of epoxy-modified polyesters that smooth out and hide any seams of imperfections is called the: a) basecoat b) electrocoat primer c) clearcoat d) primer surfacer

answer

d

question

Which type of spectroscopy is a rapid and reliable method for identifying the generic class of fiber? a) IR spectroscopy b) gas chromatographic spectroscopy c) UV spectroscopy d) pyrolysis spectroscopy

answer

b

question

Which property imparts paint with its most distinctive forensic characteristic? a) color-layer sequence b) color composition c) clear coat thickness d) testure striations

answer

a

question

Which of the following is a regenerated fiber? a) cashmere b) polyester c) triacetate d) acrylics

answer

c

question

Which of the following cannot be determined from microscopic examination of hair? a) racial orgin b) body area of origin c) age of individual d) animal or human origin

answer

c

question

A particular invaluable technique for distinguishing most paint formulas is a) thin-layer chromatography b) pyrolysis gas chromatography c) polarizing microscopy d) scanning electrons microscopy

answer

b

question

For automobile paint, the layer that gives the paint its color is the a) basecoat b) electrocoat primer c) clearcoat d) primer surfacer

answer

a

question

By far the most prevalent plant fiber, which makes its evidential value almost meaningless, is a) wool b) mohair c) nylon d) cotton

answer

d

question

In which stage of hair growth does the hair generally fall from the scalp? a) telogen b) anagen c) catagen d) fologen

answer

a

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 k now as a) APCC b) ADQ c) PDQ d) AAPD

answer

c

question

Fibers, such as rayon, which are manufactured from natural raw materials ( such as cotton or wood pulp ) are classified as a) synthetic fibers b) monomeric fibers c) birefringent fibers d) regenerated fibers

answer

d

question

Which of the following is a synthetic fiber a) wool b) acetate c) nylon d) mohair

answer

c

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 a) telogen tissue b) mitochondrial tag c) catagen tissue d) follicular tag

answer

d

question

Nuclear DNA typing can be most successfully accomplished on hairs that have been removed during which stage of growth? a) anagen b) telogen c) catagen d) anxiogen

answer

a

question

The medullary index can be used to determine whether a hair is of animal or human origin. For humans, the index is, a) generally less than one-third b) more than one-half c) about one-half d) generally more than three-forths

answer

a

question

Synthetic fibers that are composed of a large number of atoms arranged in repeating units are called a) reconstituted fibers b) chain-link fibers c) monomers d) polymers

answer

d

question

Synthetic fibers are often composed of a large number of atoms arranged in repeating units. The repeating units are called a) dimers b) chain-links c) monomers d) polymers

answer

c

question

The book Fatal Vision chronicled a famous investigation dealing with a 1979 crime that involved Jeffrey Macdonald, a military physician. He was accused for a) being a serial arsonist b) murdering 29 black youths c) killing his wife and two daughters d) none of the above

answer

c

question

Part of the evidence that was used to convict Jeffrey Mcdonald was a) an orange-brown fiber from a wig b) a unique green fiber linked to his bedroom carpet c) bloodstained cottom fibers on an icepick d) 81 blue fibers from a pajama top

answer

d

question

In his defense Jeffrey Macdonald, a military physician, claimed that, a) four intruders committed the crime of which he was accused b) the crime was an act of insanity c) a close friend in the military committed the crime d) none of the above

answer

a

question

The Atlanta Child Murders involved the murder of a) 28 Asian American females and 2 Asian American males b) 30 African American males c) 30 Asian American females d) 28 African American males and 2 African American females

answer

d

question

The primary suspect in the Atlanta Child Murders was a) Terry Nichols b) Jeffrey Macdonald c) Wayne Williams d) Jeffery Dahmer

answer

c

question

Ultimately the suspect was convicted of killing a) two adult male ex-convicts b) twelve young Asian females c) twelve preteen males d) thirty African American males

answer

a

question

The case was very unique because it was the first case where a) fiber evidence was the primary evidence b) hair evidence was used to convict someone c) paint chip evidence gave the ID of the suspects car d) DNA evidence was used in court

answer

a

question

The event that led police to the suspect in the Atlanta Child Murders was a) the discovery of a hair with DNA b) a splash in a river below a bridge c) a tip from an unknown caller d) several sightings of a man in a blue car

answer

b

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