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Chapter 7 PCC 274

Terms in this set (42)

d. 450x
A 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:
a. 65x
b. 100x
c. 650x
d. 450x
c. Use reflected illumination
In order to examine an opaque object with a compound microscope, one must:
a. Use transmitted illumination.
b. Light the object from beneath the stage.
c. Use reflected illumination.
d. Stain the object before viewing it.
d. Allows for ease of focusing when switching from low to high power
A parfocal microscope:
a. Eliminates the need to stain the specimen to be viewed.
b. Has two ocular lenses.
c. Requires a polarized light source.
d. Allows for ease of focusing when switching from low to high power.
a. Decreases
As the magnification of the compound microscope is increased, the field of view:
a. Decreases.
b. Remains the same.
c. Increases.
d. Becomes more focused.
b. Decreases
As the magnifying power of the compound microscope increases, the depth of focus:
a. Remains the same
b. Decreases
c. Increases
d. Becomes less focused
d. Both a and b
A comparison microscope designed to examine bullets and fibers is equipped with:
a. Vertical illumination.
b. Transmitted illumination.
c. Oblique illumination.
d. Both A and B.
c. Beneath the stage
The condenser of a compound microscope is located:
a. At the base.
b. Within the body tube.
c. Beneath the stage.
d. Between the coarse and fine adjustments.
b. Fine or coarse adjustment
When using a compound microscope, the areas above and below the depth of focus are best viewed by adjusting the:
a. Eyepiece lens.
b. Fine or coarse adjustment.
c. Intensity of the illumination.
d. Numerical aperture.
a. Stereoscopic
Which microscope has the largest potential working distance?
a. Stereoscopic
b. Comparison
c. Polarizing
d. Compound
b. Sterescopic
Which microscope provides a right-side-up image?
a. Comparison
b. Stereoscopic
c. Compound
d. Polarizing
c. Light source and sample stage
In the design of a polarizing microscope, the polarizer is placed between the:
a. Specimen and the analyzer.
b. Analyzer and the eyepiece.
c. Light source and the sample stage.
d. Sample stage and the analyzer.
c. Perpendicular to each other
Normally with a polarizing microscope, the polarizer and analyzer are set:
a. Parallel to each other.
b. So that maximum plane polarized light can reach the eyepiece.
c. Perpendicular to each other.
d. So that they are in constant motion.
c. Polarizing
Which microscope is best suited to the study of birefringent minerals and fibers?
a. Stereoscopic
b. Microspectrophotometer
c. Polarizing
d. Comparison
d. Microspectrophotometer
Which microscope plots an absorption spectrum of the item under examination?
a. Polarizing
b. Comparison
c. Stereoscopic
d. Microspectrophotometer
c. IR (infrared)
A microscope with which light source, when linked to a spectrophotometer, will provide a "fingerprint" spectrum of the object being viewed?
a. Visible
b. Plane polarized
c. IR (infrared)
d. UV (ultraviolet)
d. magnets
_____ are used to focus the SEM (scanning electron microscope).
a. Analyzers
b. Lenses
c. Polarizers
d. Magnets
d. A cathode ray tube
The image produced by an SEM is initially displayed on:
a. An X-ray analyzer.
b. Photographic paper.
c. An X-ray film.
d. A cathode ray tube.
a. SEM
The microscope that provides the highest resolution and greatest depth of focus is the:
a. SEM.
b. Comparison.
c. Compound.
d. Stereoscopic.
a. SEM
Which microscope can be linked to an X-ray analyzer?
a. SEM
b. Microspectrophotometer
c. Stereoscopic
d. Polarizing
c. SEM
Which microscope is most likely to be used as a tool for determining whether or not a suspect has recently fired a gun?
a. comparison
b. Polarizing
c. SEM
d. Stereoscopic
d. Both a and b
When the SEM's primary electron beam bombards a specimen, it causes the emission of:
a. Electrons from elements of the upper layer of the specimen.
b. X-rays from the target.
c. Gamma rays from the target.
d. Both A and B.
b. wood
Richard Bruno Hauptmann was convicted of the kidnap and murder of the Lindbergh child in part on the basis of optical examination of:
a. GSR (gunshot residue).
b. Wood.
c. Hair.
d. Fibers.
c. Lenses
A microscope uses a combination of _____ to magnify an image.
a. Stages
b. Mirrors
c. Lenses
d. Confocals
d. virtual
A type of image that cannot be viewed directly is called a(n) ___________ image.
a. Real
b. Imaginary
c. Reflected
d. Virtual
d. Transmitted; vertical
A transparent specimen is viewed through a microscope using _____ light while an opaque object requires _____ illumination.
a. Transmitted; stereoscopic
b. Confocal; transmitted
c. Vertical; horizontal
d. Transmitted; vertical
b. Field of view
The size of the specimen area in view is known as the:
a. Depth of field.
b. Field of view.
c. Stage size.
d. Objective.
c. Birefringent
Crystals that are _____ produce two planes of polarized light, each perpendicular to the other.
a. Amorphous
b. Solid
c. Birefringent
d. Colored
d. The crystals are non-polarizing
If crystals of unknown origin are viewed under a polarizing microscope and appear dark, what can be concluded about the crystals?
a. The crystals are not heroin crystals
b. The crystals are colorless
c. The crystals are polarizing
d. The crystals are non-polarizing
d. Both a and c
What instrument can be used to view a single fiber found at a crime scene and identify its generic class?
a. Infrared microspectrophotometer
b. Stereoscopic microscope
c. Polarizing microscope
d. Both a and c
b. High reproducibility
The major advantages of the SEM image include all of the following except:
a. High magnification.
b. High reproducibility.
c. High resolution.
d. Great depth of focus.
a. Expander
Components of a compound microscope include all of the following except:
a. Expander.
b. Stage.
c. Coarse adjustment.
d. Condenser.
d. 0.75
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:
a. 0.65.
b. 3.00.
c. 30.00.
d. 0.75.
b. upside down and backwards
An object with the letter "L" is viewed under low power of a compound microscope. The image would appear as:
a. the same L

b. upside down and backwards

c. just upside down

d. backwards
d. objective lens multiplied by the eyepiece lens
The magnification power of a microscope equals the magnifying power of the:
a. Eyepiece lens.
b. Objective lens.
c. Objective lens multiplied by two.
d. Objective lens multiplied by the eyepiece lens.
b. Reflected light
The microscope examination of a bullet requires:
a. Transmitted light.
b. Reflected light.
c. Condensed light.
d. All of the above.
d. The body tube
Which of these is not part of the optical system of a compound microscope?
a. Abbé condenser
b. Objective lens
c. Eyepiece lens
d. The body tube
a. If the polarizer and analyzer of a polarizing microscope are placed parallel to each other, no light will penetrate
Which of the following statements is false?
a. If the polarizer and analyzer of a polarizing microscope are placed parallel to each other, no light will penetrate.
b. Light confined to a single plane of vibration is said to be polarized.
c. Many crystals are birefringent.
d. The lens nearest the specimen is called the objective lens.
b. Comparison microscope
The most important tool of the firearms examiner is the:
a. Compound microscope.
b. Comparison microscope.
c. Stereoscopic microscope.
d. Polarizing microscope.
d. microwaves are generated when the electron beam of the SEM strikes a target
Which of the following is false?
a. The scanning electron microscope (SEM) produces an image by aiming a beam of electrons onto a specimen.
b. The major attraction of the SEM is its high magnification and depth of field.
c. The SEM produces an image that is stereoscopic in appearance.
d. Microwaves are generated when the electron beam of the SEM strikes a target.
d. Spores
Palynology is the study of:
a. Fish.
b. Insects.
c. Birds.
d. Spores.
c. Entomophilous
Which type of pollen is rarely deposited on objects except by direct contact with the plant?
a. Anemophilous
b. Exine
c. Entomophilous
d. Gameotphyte
a. Sculpturing
42. The pattern of the pollen grain surface is called:
a. Sculpturing.
b. Apertures.
c. Exine.
d. Pollen rain.
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