q1.techproapp fs - applies effective techniques and processes to forensic evidence at crime scene
multiple choice
1. which of the following terms best describes the type of evidence usually collected in arson cases?
a. concealed c. conclusive
b. combustion d. circumstantial
2. to classify a fire, investigators first try to
a. interview eyewitnesses c. locate the origin of the fire
b. establish the cause of the fire d. question the owner of the property
3. after investigators determine who had access to the arson scene, they will
a. ask these individuals for alibis c. search the homes of these people
b. give each individual a polygraph test d. take the fingerprints of these people
4. upon whom will fire investigators focus first when trying to establish proof of motive?
a. 911 caller c. owner of property
b. eyewitness d. relatives of owner
5. in which of the following materials or locations does fire tend to burn longest and thus cause the most damage?
a. carpet b. wood floor joists
b. point of origin d. nonporous floors
6. the bottom of a classic v burn pattern represents the location of the __i__ severe fire damage on an __ii__ surface. the statement above is best completed by the information in row

| row | i | ii |
|-----|------|----------|
| a | most | vertical |
| b | most | horizontal|
| c | least| vertical |
| d | least| horizontal|
7. which of the following observations is evidence that hydrocarbons are used as an accelerant?
a. distinct v patterns and dark soot c. little physical damage/ superficial scorching
b. circular burn patterns/melted material d. extensive physical damage/distinct dark - coloured pattern
8. which of the following accelerants tends to cause the least physical damage (superficial scorching)?
a. diesel c. gasoline
b. alcohol d. kerosene
9. a device that consists of a series of glass sampling tubes lined with absorbent material which collects vapours is a
a. gas chromatography unit c. photoionization detector
b. portable arson sampler d. solid - phase microextraction unit

Question

q1.techproapp fs - applies effective techniques and processes to forensic evidence at crime scene
multiple choice
1. which of the following terms best describes the type of evidence usually collected in arson cases?
   a. concealed  c. conclusive
   b. combustion  d. circumstantial
2. to classify a fire, investigators first try to
   a. interview eyewitnesses  c. locate the origin of the fire
   b. establish the cause of the fire  d. question the owner of the property
3. after investigators determine who had access to the arson scene, they will
   a. ask these individuals for alibis  c. search the homes of these people
   b. give each individual a polygraph test  d. take the fingerprints of these people
4. upon whom will fire investigators focus first when trying to establish proof of motive?
   a. 911 caller  c. owner of property
   b. eyewitness  d. relatives of owner
5. in which of the following materials or locations does fire tend to burn longest and thus cause the most damage?
   a. carpet  b. wood floor joists
   b. point of origin  d. nonporous floors
6. the bottom of a classic v burn pattern represents the location of the __i__ severe fire damage on an __ii__ surface. the statement above is best completed by the information in row

| row | i    | ii       |
   |-----|------|----------|
   | a   | most | vertical |
   | b   | most | horizontal|
   | c   | least| vertical |
   | d   | least| horizontal|
7. which of the following observations is evidence that hydrocarbons are used as an accelerant?
   a. distinct v patterns and dark soot  c. little physical damage/ superficial scorching
   b. circular burn patterns/melted material  d. extensive physical damage/distinct dark - coloured pattern
8. which of the following accelerants tends to cause the least physical damage (superficial scorching)?
   a. diesel  c. gasoline
   b. alcohol  d. kerosene
9. a device that consists of a series of glass sampling tubes lined with absorbent material which collects vapours is a
   a. gas chromatography unit  c. photoionization detector
   b. portable arson sampler  d. solid - phase microextraction unit

Accepted Answer

### Question 1
# Brief Explanations:
In arson cases, evidence like patterns of burn, presence of accelerants (but hard to get direct proof) is often circumstantial. Concealed is about hiding, combustion is the process, conclusive is direct proof (rare in arson as it's hard to get direct proof of intent/act). So circumstantial fits.
# Answer:
d. Circumstantial

### Question 2
# Brief Explanations:
To classify a fire, the first step is to find where it started (origin). Interviewing eyewitnesses or questioning owner comes later, and establishing cause is after locating origin. So "locate the origin of the fire" is correct.
# Answer:
c. Locate the origin of the fire

### Question 3
# Brief Explanations:
After identifying who had access, asking for alibis (proof they were elsewhere) is a logical step. Polygraphs are not standard first step, searching homes or taking fingerprints are more invasive and later steps. So asking for alibis is correct.
# Answer:
a. Ask these individuals for alibis

### Question 4
# Brief Explanations:
To establish motive, the owner of the property is a key person (e.g., financial issues, disputes, insurance). 911 caller may be a bystander, eyewitness may not know motive, relatives of owner may not have direct motive info. So owner of property is first focus.
# Answer:
c. Owner of property

### Question 5
# Brief Explanations:
The point of origin (where fire started) has the longest burn time as fire spreads from there, so it causes most damage. Carpet, wood floor joists, or nonporous floors burn less long than the origin area.
# Answer:
b. Point of origin

### Question 6
# Brief Explanations:
A classic V - burn pattern has the most severe damage at the bottom (of the V) on a vertical surface (since fire rises, the base of the V on vertical surface gets most damage). So row A (most, vertical) is correct.
# Answer:
A. most, vertical

### Question 7
# Brief Explanations:
Hydrocarbons (like gasoline) as accelerants cause extensive physical damage and distinct dark - coloured patterns (from incomplete combustion/specific burn patterns). Distinct V patterns are from fire spread, circular burn is not typical, little damage is not from hydrocarbons (they cause more damage). So "extensive physical damage/distinct dark - coloured pattern" is correct.
# Answer:
d. Extensive physical damage/distinct dark - coloured pattern

### Question 8
# Brief Explanations:
Alcohol (like ethanol) tends to cause more superficial scorching (less physical damage) compared to diesel, gasoline, or kerosene which are more volatile and cause more intense burns. So alcohol is the one with least physical damage.
# Answer:
b. Alcohol

### Question 9
# Brief Explanations:
A portable arson sampler has glass tubes with absorbent material to collect vapours from arson scenes. Gas chromatography unit is for analysis, photoionization detector is for detection, solid - phase microextraction unit is different. So portable arson sampler is correct.
# Answer:
b. Portable arson sampler

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