1385867
Descripción
Test por cheetahgoddess, actualizado hace más de 1 año
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Creado por cheetahgoddess
hace casi 10 años
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Pregunta 1
Pregunta
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:
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65x
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100x
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650x
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450x
Pregunta 2
Pregunta
In order to examine an opaque object with a compound microscope, one must:
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Use transmitted illumination.
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Light the object from beneath the stage.
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Use reflected illumination.
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Stain the object before viewing it.
Pregunta 3
Pregunta
A parfocal microscope:
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Eliminates the need to stain the specimen to be viewed.
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Has two ocular lenses.
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Requires a polarized light source.
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Allows for ease of focusing when switching from low to high power.
Pregunta 4
Pregunta
As the magnification of the compound microscope is increased, the field of view:
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Decreases
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Remains the same
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Increases
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Becomes more focused
Pregunta 5
Pregunta
As the magnifying power of the compound microscope increases, the depth of focus:
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Remains the same
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Decreases
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Increases
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Becomes less focused
Pregunta 6
Pregunta
A comparison microscope designed to examine bullets and fibers is equipped with:
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Vertical illumination.
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Transmitted illumination.
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Oblique illumination.
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Both A and B.
Pregunta 7
Pregunta
When using a compound microscope, the areas above and below the depth of focus are best viewed by adjusting the:
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Eyepiece lens.
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Fine or coarse adjustment.
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Intensity of the illumination.
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Numerical aperture.
Pregunta 8
Pregunta
Which microscope has the largest potential working distance?
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Steroscopic
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Comparison
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Polarizing
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Compound
Pregunta 9
Pregunta
Which microscope provides a right-side-up image?
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Comparison
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Steroscopic
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Compound
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Polarizing
Pregunta 10
Pregunta
In the design of a polarizing microscope, the polarizer is placed between the:
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Specimen and the analyzer.
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Analyzer and the eyepiece.
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Light source and the sample stage.
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Sample stage and the analyzer.
Pregunta 11
Pregunta
Normally with a polarizing microscope, the polarizer and analyzer are set:
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Parallel to each other.
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So that maximum plane polarized light can reach the eyepiece.
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Perpendicular to each other.
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So that they are in constant motion.
Pregunta 12
Pregunta
Which microscope is best suited to the study of birefringent minerals and fibers?
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Stereoscopic
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Microspectrophotometer
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Polarizing
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Comparison
Pregunta 13
Pregunta
The condenser of a compound microscope is located:
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At the base.
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Within the body tube.
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Beneath the stage.
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Between the coarse and fine adjustments.
Pregunta 14
Pregunta
Which microscope plots an absorption spectrum of the item under examination?
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Polarizing
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Comparison
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Stereoscopic
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Microspectrophotometer
Pregunta 15
Pregunta
A microscope with which light source, when linked to a spectrophotometer, will provide a "fingerprint" spectrum of the object being viewed?
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Visible
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Plane polarized
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IR (infrared)
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UV (ultraviolet)
Pregunta 16
Pregunta
_____ are used to focus the SEM (scanning electron microscope).
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Analyzers
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Lenses
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Polarizers
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Magnets
Pregunta 17
Pregunta
The image produced by an SEM is initially displayed on:
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An X-ray analyzer.
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Photographic paper.
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An X-ray film.
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A cathode ray tube.
Pregunta 18
Pregunta
The microscope that provides the highest resolution and greatest depth of focus is the:
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SEM
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Comparison
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Compound
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Steroscopic
Pregunta 19
Pregunta
Which microscope can be linked to an X-ray analyzer?
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SEM
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Microspectrophotometer
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Steroscopic
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Polarizing
Pregunta 20
Pregunta
Which microscope is most likely to be used as a tool for determining whether or not a suspect has recently fired a gun?
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Comparison
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Polarizing
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SEM
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Steroscopic
Pregunta 21
Pregunta
When the SEM's primary electron beam bombards a specimen, it causes the emission of:
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Electrons from elements of the upper layer of the specimen.
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X-rays from the target.
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Gamma rays from the target.
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Both A and B.
Pregunta 22
Pregunta
Richard Bruno Hauptmann was convicted of the kidnap and murder of the Lindbergh child in part on the basis of optical examination of:
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GSR (gunshot residue)
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Wood
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Hair
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Fibers
Pregunta 23
Pregunta
A microscope uses a combination of _____ to magnify an image.
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Stages
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Mirrors
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Lenses
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Confocals
Pregunta 24
Pregunta
A type of image that cannot be viewed directly is called a(n) ___________ image.
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Real
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Imaginary
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Reflected
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Virtual
Pregunta 25
Pregunta
A transparent specimen is viewed through a microscope using _____ light while an opaque object requires _____ illumination.
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Transmitted; stereoscopic
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Confocal; transmitted
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Vertical; horizontal
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Transmitted; vertical
Pregunta 26
Pregunta
The size of the specimen area in view is known as the:
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Depth of field.
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Field of view.
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Stage size.
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Objective.
Pregunta 27
Pregunta
Crystals that are _____ produce two planes of polarized light, each perpendicular to the other.
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Amporphous
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Solid
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Birefringent
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Colored
Pregunta 28
Pregunta
If crystals of unknown origin are viewed under a polarizing microscope and appear dark, what can be concluded about the crystals?
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The crystals are not heroin crystals
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The crystals are colorless
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The crystals are polarizing
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The crystals are non-polarizing
Pregunta 29
Pregunta
What instrument can be used to view a single fiber found at a crime scene and identify its generic class?
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Infrared microspectrophotometer
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Stereoscopic microscope
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Polarizing microscope
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Both a and c
Pregunta 30
Pregunta
The major advantages of the SEM image include all of the following except:
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High magnification.
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High reproducibility.
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High resolution.
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Great depth of focus.
Pregunta 31
Pregunta
Components of a compound microscope include all of the following except:
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Expander.
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Stage.
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Coarse adjustment.
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Condenser.
Pregunta 32
Pregunta
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:
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0.65
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3.00
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30.00
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0.75
Pregunta 33
Pregunta
An object with the letter "L" is viewed under low power of a compound microscope. The image would appear as:
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Regular
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Upside-down, Flipped
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Upside-down
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Flipped
Pregunta 34
Pregunta
The magnification power of a microscope equals the magnifying power of the:
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Eyepiece lens.
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Objective lens.
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Objective lens multiplied by two.
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Objective lens multiplied by the eyepiece lens.
Pregunta 35
Pregunta
The microscope examination of a bullet requires:
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Transmitted light.
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Reflected light.
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Condensed light.
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All of the above.
Pregunta 36
Pregunta
Which of these is not part of the optical system of a compound microscope?
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Abbé condenser
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Objective lens
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Eyepiece lens
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The body tube
Pregunta 37
Pregunta
Which of the following statements is false?
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If the polarizer and analyzer of a polarizing microscope are placed parallel to each other, no light will penetrate.
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Light confined to a single plane of vibration is said to be polarized.
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Many crystals are birefringent.
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The lens nearest the specimen is called the objective lens.
Pregunta 38
Pregunta
The most important tool of the firearms examiner is the:
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Compound microscope.
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Comparison microscope.
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Stereoscopic microscope.
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Polarizing microscope.
Pregunta 39
Pregunta
Which of the following is false?
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The scanning electron microscope (SEM) produces an image by aiming a beam of electrons onto a specimen.
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The major attraction of the SEM is its high magnification and depth of field.
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The SEM produces an image that is stereoscopic in appearance.
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Microwaves are generated when the electron beam of the SEM strikes a target.
Pregunta 40
Pregunta
Palynology is the study of:
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Fish
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Insects
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Birds
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Spores
Pregunta 41
Pregunta
Which type of pollen is rarely deposited on objects except by direct contact with the plant?
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Anemophilous
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Exine
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Entomophilous
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Gameotphyte
Pregunta 42
Pregunta
The pattern of the pollen grain surface is called:
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Sculpturing.
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Apertures.
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Exine.
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Pollen rain.
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