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Forensic Science Chapter 7

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Quiz sobre Forensic Science Chapter 7, criado por cheetahgoddess em 01-10-2014.
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Quiz por cheetahgoddess, atualizado more than 1 year ago
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Criado por cheetahgoddess aproximadamente 10 anos atrás
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Resumo de Recurso

Questão 1

Questão
compound microscope is equipped with two objective lenses (10x and 45x) and has a 10x ocular lens. The highest magnification attainable with this instrument is:
Responda
  • 65x
  • 100x
  • 650x
  • 450x

Questão 2

Questão
In order to examine an opaque object with a compound microscope, one must:
Responda
  • Use transmitted illumination.
  • Light the object from beneath the stage.
  • Use reflected illumination.
  • Stain the object before viewing it.

Questão 3

Questão
A parfocal microscope:
Responda
  • Eliminates the need to stain the specimen to be viewed.
  • Has two ocular lenses.
  • Requires a polarized light source.
  • Allows for ease of focusing when switching from low to high power.

Questão 4

Questão
As the magnification of the compound microscope is increased, the field of view:
Responda
  • Decreases
  • Remains the same
  • Increases
  • Becomes more focused

Questão 5

Questão
As the magnifying power of the compound microscope increases, the depth of focus:
Responda
  • Remains the same
  • Decreases
  • Increases
  • Becomes less focused

Questão 6

Questão
A comparison microscope designed to examine bullets and fibers is equipped with:
Responda
  • Vertical illumination.
  • Transmitted illumination.
  • Oblique illumination.
  • Both A and B.

Questão 7

Questão
When using a compound microscope, the areas above and below the depth of focus are best viewed by adjusting the:
Responda
  • Eyepiece lens.
  • Fine or coarse adjustment.
  • Intensity of the illumination.
  • Numerical aperture.

Questão 8

Questão
Which microscope has the largest potential working distance?
Responda
  • Steroscopic
  • Comparison
  • Polarizing
  • Compound

Questão 9

Questão
Which microscope provides a right-side-up image?
Responda
  • Comparison
  • Steroscopic
  • Compound
  • Polarizing

Questão 10

Questão
In the design of a polarizing microscope, the polarizer is placed between the:
Responda
  • Specimen and the analyzer.
  • Analyzer and the eyepiece.
  • Light source and the sample stage.
  • Sample stage and the analyzer.

Questão 11

Questão
Normally with a polarizing microscope, the polarizer and analyzer are set:
Responda
  • Parallel to each other.
  • So that maximum plane polarized light can reach the eyepiece.
  • Perpendicular to each other.
  • So that they are in constant motion.

Questão 12

Questão
Which microscope is best suited to the study of birefringent minerals and fibers?
Responda
  • Stereoscopic
  • Microspectrophotometer
  • Polarizing
  • Comparison

Questão 13

Questão
The condenser of a compound microscope is located:
Responda
  • At the base.
  • Within the body tube.
  • Beneath the stage.
  • Between the coarse and fine adjustments.

Questão 14

Questão
Which microscope plots an absorption spectrum of the item under examination?
Responda
  • Polarizing
  • Comparison
  • Stereoscopic
  • Microspectrophotometer

Questão 15

Questão
A microscope with which light source, when linked to a spectrophotometer, will provide a "fingerprint" spectrum of the object being viewed?
Responda
  • Visible
  • Plane polarized
  • IR (infrared)
  • UV (ultraviolet)

Questão 16

Questão
_____ are used to focus the SEM (scanning electron microscope).
Responda
  • Analyzers
  • Lenses
  • Polarizers
  • Magnets

Questão 17

Questão
The image produced by an SEM is initially displayed on:
Responda
  • An X-ray analyzer.
  • Photographic paper.
  • An X-ray film.
  • A cathode ray tube.

Questão 18

Questão
The microscope that provides the highest resolution and greatest depth of focus is the:
Responda
  • SEM
  • Comparison
  • Compound
  • Steroscopic

Questão 19

Questão
Which microscope can be linked to an X-ray analyzer?
Responda
  • SEM
  • Microspectrophotometer
  • Steroscopic
  • Polarizing

Questão 20

Questão
Which microscope is most likely to be used as a tool for determining whether or not a suspect has recently fired a gun?
Responda
  • Comparison
  • Polarizing
  • SEM
  • Steroscopic

Questão 21

Questão
When the SEM's primary electron beam bombards a specimen, it causes the emission of:
Responda
  • Electrons from elements of the upper layer of the specimen.
  • X-rays from the target.
  • Gamma rays from the target.
  • Both A and B.

Questão 22

Questão
Richard Bruno Hauptmann was convicted of the kidnap and murder of the Lindbergh child in part on the basis of optical examination of:
Responda
  • GSR (gunshot residue)
  • Wood
  • Hair
  • Fibers

Questão 23

Questão
A microscope uses a combination of _____ to magnify an image.
Responda
  • Stages
  • Mirrors
  • Lenses
  • Confocals

Questão 24

Questão
A type of image that cannot be viewed directly is called a(n) ___________ image.
Responda
  • Real
  • Imaginary
  • Reflected
  • Virtual

Questão 25

Questão
A transparent specimen is viewed through a microscope using _____ light while an opaque object requires _____ illumination.
Responda
  • Transmitted; stereoscopic
  • Confocal; transmitted
  • Vertical; horizontal
  • Transmitted; vertical

Questão 26

Questão
The size of the specimen area in view is known as the:
Responda
  • Depth of field.
  • Field of view.
  • Stage size.
  • Objective.

Questão 27

Questão
Crystals that are _____ produce two planes of polarized light, each perpendicular to the other.
Responda
  • Amporphous
  • Solid
  • Birefringent
  • Colored

Questão 28

Questão
If crystals of unknown origin are viewed under a polarizing microscope and appear dark, what can be concluded about the crystals?
Responda
  • The crystals are not heroin crystals
  • The crystals are colorless
  • The crystals are polarizing
  • The crystals are non-polarizing

Questão 29

Questão
What instrument can be used to view a single fiber found at a crime scene and identify its generic class?
Responda
  • Infrared microspectrophotometer
  • Stereoscopic microscope
  • Polarizing microscope
  • Both a and c

Questão 30

Questão
The major advantages of the SEM image include all of the following except:
Responda
  • High magnification.
  • High reproducibility.
  • High resolution.
  • Great depth of focus.

Questão 31

Questão
Components of a compound microscope include all of the following except:
Responda
  • Expander.
  • Stage.
  • Coarse adjustment.
  • Condenser.

Questão 32

Questão
An objective lens with a numerical aperture of 1.50 can separate details at half the distance of a lens with a numerical aperture of:
Responda
  • 0.65
  • 3.00
  • 30.00
  • 0.75

Questão 33

Questão
An object with the letter "L" is viewed under low power of a compound microscope. The image would appear as:
Responda
  • Regular
  • Upside-down, Flipped
  • Upside-down
  • Flipped

Questão 34

Questão
The magnification power of a microscope equals the magnifying power of the:
Responda
  • Eyepiece lens.
  • Objective lens.
  • Objective lens multiplied by two.
  • Objective lens multiplied by the eyepiece lens.

Questão 35

Questão
The microscope examination of a bullet requires:
Responda
  • Transmitted light.
  • Reflected light.
  • Condensed light.
  • All of the above.

Questão 36

Questão
Which of these is not part of the optical system of a compound microscope?
Responda
  • Abbé condenser
  • Objective lens
  • Eyepiece lens
  • The body tube

Questão 37

Questão
Which of the following statements is false?
Responda
  • If the polarizer and analyzer of a polarizing microscope are placed parallel to each other, no light will penetrate.
  • Light confined to a single plane of vibration is said to be polarized.
  • Many crystals are birefringent.
  • The lens nearest the specimen is called the objective lens.

Questão 38

Questão
The most important tool of the firearms examiner is the:
Responda
  • Compound microscope.
  • Comparison microscope.
  • Stereoscopic microscope.
  • Polarizing microscope.

Questão 39

Questão
Which of the following is false?
Responda
  • The scanning electron microscope (SEM) produces an image by aiming a beam of electrons onto a specimen.
  • The major attraction of the SEM is its high magnification and depth of field.
  • The SEM produces an image that is stereoscopic in appearance.
  • Microwaves are generated when the electron beam of the SEM strikes a target.

Questão 40

Questão
Palynology is the study of:
Responda
  • Fish
  • Insects
  • Birds
  • Spores

Questão 41

Questão
Which type of pollen is rarely deposited on objects except by direct contact with the plant?
Responda
  • Anemophilous
  • Exine
  • Entomophilous
  • Gameotphyte

Questão 42

Questão
The pattern of the pollen grain surface is called:
Responda
  • Sculpturing.
  • Apertures.
  • Exine.
  • Pollen rain.

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