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Trace Review 2021

Total questions: 64

Worksheet time: 34mins

Name
Class
Date
1.

Which of these is not an example of trace?

a)

hair

b)

fibers

c)

dirt

d)

bullet

2.

How is trace collected?

a)

tweezers

b)

tape

c)

air filter

d)

all of the above

3.

Which of these provides the most highly magnified image?

a)

optical microscope

b)

transmission electron microscope

c)

scanning electron microscope

d)

magnifying glass

4.

How many times can an SEM magnify an image?

a)

1000x

b)

250x

c)

250,000x

d)

50 million times

5.

This structure is contains the melanin in human hair

a)

cortex

b)

cuticle

c)

follicle

d)

medulla

6.

This is the color pigment in human hair (and skin)

a)

medulla

b)

melanin

c)

nylon

d)

wool

7.

This fiber is flat in shape and folds or twists on itself

a)

silk

b)

wool

c)

polyester

d)

cotton

8.

This fiber is made of purified cellulose

a)

rayon

b)

nylon

c)

cellyon

d)

silk

9.

This is the thinnest natural fiber

a)

cotton

b)

wool

c)

alpaca wool

d)

silk

10.

This structure is often small or even absent in humans

a)

mustache

b)

cortex

c)

medulla

d)

cuticle

11.

This transparent structure often appears scaly on the surface

a)

cortex

b)

cellulite

c)

cuticle

d)

medulla

12.

Which fiber is shown here?

a)

silk

b)

polyester

c)

rayon

d)

cotton

13.

Which fiber is shown here?

a)

polyester

b)

cotton

c)

alpaca

d)

silk

14.

The medulla of a hair found at a crime scene is 40 µm in diameter. The diameter of the hair shaft is 100 µm. What is the medullary index and is it human?

a)

0.2, yes

b)

0.4, no

c)

0.6, no

d)

0.8, yes

15.

Trace amounts of marijuana are found in a hair at 6.0 mm from the root. How many days ago was this person exposed to marijuana? Assume hair grows at 0.5 mm/day.

a)

5 days

b)

10 days

c)

12 days

d)

24 days

16.

Which part of the hair contains the most pigmentation ?

a)

medulla

b)

cuticle

c)

follicle

d)

cortex

17.

Who coined the phrase "Every Contact Leaves a Trace"?

a)

Walter McCrone

b)

Edmond Locard

c)

Calvin Goddard

d)

Francis Galton

18.

What is the medulla?

a)

the central core of the hair shaft that may be absent in some species

b)

the protein rich structure around the central core of the hair shaft that contains pigment

c)

the outer covering of the hair shaft that is composed of overlapping scales

d)

part of the brain

19.
What is number 14?
a)
stage clips
b)
stage
c)
diaphragm
d)
light source
20.
When would you use the diaphragm?
a)
When you wanted to move the stage
b)
When you wanted to adjust the light
c)
When you wanted to put the microscope away
d)
When you sneeze
21.

Use the _______ focuses the image under low power.

a)

revolving nosepiece

b)

fine adjustment knob

c)

coarse adjustment knob

d)

arm/neck

22.
What is number 17?
a)
body tube
b)
arm/neck
c)
stage
d)
base
23.

Which among the following has the highest magnification power?

a)

Magnifying lens

b)

Compound Microscope

c)

TEM

d)

SEM

24.

The lens of the eyepiece has a magnification of:

a)

1x

b)

10x

c)

100x

d)

4x

25.

The system of 3 lenses nearest to the specimen

a)

eyepiece

b)

objectives

c)

stage

d)

ocular triage

26.

The microscope where electrons are reflected or knocked off near the surface region to produce an image.

a)

Compound Light Microscope

b)

Stereomicroscope

c)

TEM

d)

SEM

27.

The microscope where electrons pass through to produce an image.......

a)

Compound Light Microscope

b)

Stereomicroscope

c)

TEM

d)

SEM

28.

The image shown is the _.

a)

diapragm

b)

objective lens

c)

eyepiece

d)

base

29.
You should always carry the microscope by the
a)
arm and base
b)
arm and body tube
c)
arm only
d)
the objectives
30.

If the eyepiece is 10X and we are using the high objective lens (40X), how many times is the image magnified?

a)

40

b)

4000

c)

400

d)

4

31.

We begin to look at our specimen using which combination?

a)

high power and fine adjustment knob

b)

high power and coarse adjustment knob

c)

low power and coarse adjustment knob

d)

low power and fine adjustment knob

32.
Electron microscopes use a beam of _________________ to produce an image magnified up to 100,000 or more
a)
Sunlight
b)
Lasers
c)
Electrons
33.

Which of the following tools is used to recover trace evidence?

a)

vacuum cleaner

b)

brown paper bag

c)

microscope

d)

a camera

34.

Which of the answers describe natural fibers?

a)

rayon, nylon, wool

b)

cotton, polyester, cashmere

c)

linen, cotton, silk

d)

silk, spandex, polyester

35.

Which of the following is a synthetic fiber?

a)

rayon

b)

silk

c)

cashmere

d)

polyester

36.

What is the thickness and shape of synthetic fibers?

a)

thinner than natural fibers and spiky on the surface

b)

thicker than natural fibers and flat

c)

as thick as natural fibers and round

d)

it can be manufactured with any thickness and shape

37.

Which fiber is this most likely?

a)

rayon

b)

cotton

c)

wool

d)

nylon

38.

What observation can be made about this fiber?

a)

It's a white hair because the color is white

b)

It's likely a synthetic fiber because of its surface imperfections

c)

It's from an animal because of its scaly surface

d)

It's likely very comfortable

39.

Which type of fiber is this?

a)

alpaca wool

b)

nylon

c)

polyester

d)

cotton

40.

Which type of fiber is this?

a)

silk

b)

rayon

c)

cotton

d)

wool

41.

What is one clear indication we are observing a synthetic fiber as opposed to a natural fiber?

a)

the color of its fibers

b)

the way that the fibers burn

c)

the way it's woven together

d)

the presence of delusterants

42.

What information does pollen provide an investigator?

a)

the name of the victim

b)

the distance from the nearest flower

c)

the allergies of the suspect

d)

the region and time of year of the crime

43.

This type of microscope uses visible light

a)

optical light microscope

b)

scanning electron microscope

c)

transmission electron microscope

d)

laser microscope

44.

This type of microscope has the highest resolution

a)

optical microscope

b)

scanning electron microscope

c)

transmission electron microscope

d)

super laser microscope

45.

This is used to prepare trace for glass slide.

a)

clear nail polish or corn syrup

b)

superglue

c)

hot glue

d)

no special preparation

46.

This natural fiber is flat and ribbon shaped

a)

silk

b)

wool

c)

linen

d)

cotton

47.

This is among the thinnest natural fibers.

a)

silk

b)

cotton

c)

wool

d)

linen

48.

This manufactured fiber is made of cellulose

a)

cashmere

b)

polyester

c)

nylon

d)

rayon

49.

This is the surface of a strand of hair

a)

medulla

b)

cuticle

c)

cortex

d)

follicle

50.

This part of hair contains the melanin.

a)

medulla

b)

cuticle

c)

cortex

d)

follicle

51.

At the center of a strand of hair, this part of hair can help us determine the MI.

a)

medulla

b)

cuticle

c)

cortex

d)

follicle

52.

Which of these is NOT a natural fiber?

a)

alpaca wool

b)

spider silk

c)

spandex

d)

hemp fiber

53.

Which fiber type is being observed here?

a)

rayon

b)

cotton

c)

wool

d)

nylon

54.

What hair/fiber is being observed here?

a)

a synthetic fiber

b)

a human hair

c)

an animal hair

d)

a natural fiber

55.

A hair has a medulla of 50 micrometers and a thickness of 200 micrometers. What is the MI and is it human?

a)

0.3 and human

b)

0.25 and human

c)

0.5 and non-human

d)

0.1 and non-human

56.
The most common type of regenerated fiber, derived from cellulose is
a)
cotton
b)
rayon
c)
silk
d)
nylon
57.
Small grains that contain a plant's male reproductive cells.
a)
stamen
b)
pollen
c)
anther
d)
stigma
58.
Brightly colored parts of flowers that attract insects.
a)
petals
b)
pistils
c)
stamen
d)
filaments
59.
The transfer of pollen, containing the sperm cells, to the female part of the flower. 
a)
seed dispersal
b)
fertilization 
c)
germination
d)
pollination
60.

What do wear patterns tell us about a shoe?

a)

How new it is

b)

How worn down it is

c)

How tall the person wearing it is

61.

Small things that get trapped in the treads of a shoe would be what type of evidence?

a)

Transient

b)

Chemical

c)

Trace

62.

Which shoeprint matches the unknown?

a)

A

b)

B

c)

C

63.

What is happening in this picture?

a)

Dusting for shoe impressions

b)

Casting/Making a shoe model

c)

Collecting trace evidence

64.

Which image shows dusting?

a)

A

b)

B

c)

C

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