GHS Forensics 3
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| components of glass | Sand,Lime,Soda
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| The major component of glass known as silicon dioxide is | Sand
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| Ingredient in glass helps prevent glass from dissolving in water | Lime
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| Ingredient helps lower the melting point of glass | Soda
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| Float glass is one type of this glass that is cooled on top a bath of molten tin | soda-lime glass
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| Glass through which strength is added by introducing stress through rapid heating and cooling | tempered glass
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| Front windshields of cars are made with this type of glass | laminated glass
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| Most windows and bottles are made from this type of glass | soda-lime glass
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| Automobile headlights and heat resistant glass like pyrex are this type of glass | borosilicate glass
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| Glass that breaks into dices or small squares but does not “shatter” into sharp shards | tempered glass
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| The interlayer of this type of glass keeps the layers of glass bonded even when broken, and its high strength prevents the glass from breaking up into large sharp pieces | laminated glass
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| This type of glass is primarily used on back and side windows of cars | tempered glass
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| Two sheets of glass are bonded together with a plastic film | laminated glass
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| Which of the following is the least reliable when analyzing glass from a crime scene | putting the glass back together
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| The calculation of density for a piece of glass | mass/volume
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| This method is used when glass fragments found at the crime scene are small and the refractive index needs to be found | Submersion method
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| A halo-like effect appearing at the edges of a glass fragment when the reflective index of the glass and liquid are different. | Becke line
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| A measure of the degree to which the glass bends light when the light moves from one medium to another is known as the | Refractive index
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| Glass typically will not break into regular pieces with straight line fractures because it is considered this type of solid | Amorphous solid
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| This provides clues about the direction, rate, and sequence of impacts on glass | Fracture lines
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| These types of fractures occur outward like a spoke of a wheel | Radial
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| These types of fractures form rough circles around point of impact | Concentric
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| These fractures form on the same side of the impact | Concentric
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| These fractures break in the glass outward on the opposite side from the point of impact | Radial
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| A key point about soil when it comes to analyzing it in relation to color is this | it must be dry
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| Major types of soil | clay, clayloam, loam, sand
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| Soil must vary at a maximum at this interval from the scene of the crime to be considered unique to that area | 100 yards
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| Number of minerals commonly found in most types of soil | 20-40
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| Number of distinguishable soil colors are there | 1100
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| Projectile hole is inevitably wider on which side | point of exit
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| Is it possible to identify the size of the penetrating bullet by examining a bullet hole in an un-shattered pain of glass | No
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| Is it impossible to identify the direction of the bullet by examining a bullet hole in an un-shattered pain of glass | No
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| When an object begins to penetrate a pain of glass these fractures are the first to form | radial fractures
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| Radial fracture lines form on the surface ________________ of the penetrating force. | opposite
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| These form on the same surface of the penetrating force | Concentric fracture lines
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| Does tempered glass easily show radial and concentric circles? | no
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| This is the easiest way to identify most soils | side by side comparison
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| Often times when comparing soils this can be an important part of the soil | Artificial material
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| These form at right angles on the reverse side: | radial fractures
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| Radial fractures for m these on the reverse side | right angles
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| Radial fractures form right angles on this side | reverse side
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| Does a fracture terminate at an existing line of fracture? | Yes
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| Soil is best and easily compared when it has this physical property | dry
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| How many minerals exist that could potentially show up in a soil | 2200
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| Naturally occurring crystals found in soil are called | minerals.
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| Maximum distance from the crime scene that soil can still be the same –it must vary after this distance | 100 yards
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| There range of common minerals that geologist will encounter during soil examination | 20-40
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| How many types of distinguishable soil colors | 1100
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| Exposure of soil to this may reveal the presence of plant or animal materials or man-made debris | ultra-violet light
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| In order to detect smaller particular minerals and synthetic materials in the soil this type of examination must occur | microscopy
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| Using density gradient tubes to identify soil determines this about the soil | density
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| Part of soil that must be collected from crime scence:- | top soil
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| type of borosilicate used in bakeware | pyrex
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| Point when the becke line disappears. | match point
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| To determine that a gun was used to penetrate glass versus a blunt object this must be present | gun powder residue
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