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