Exam 17: Forensic Aspects of Fire and Explosion Investigation

Which is available in commercial form as fertilizer?

List three common signs of arson at a fire scene.

What is NOT true about primary explosives?

The most widely used ________ explosives are black powder and smokeless powder.

Rusting is not accompanied by combustion.

The ________ point is the lowest temperature at which a liquid gives off sufficient vapor to form a mixture with air that will support combustion.

A fuel does not need to be present to initiate and sustain combustion.

A low explosive has a velocity of detonation less than:

A large container of gasoline is recovered from the walk-in freezer at a restaurant owned by an arson suspect.The gasoline temperature is found to be -10 degrees Fahrenheit.The suspect claims this gasoline would be too cold to have been used as an accelerant in the arson.Describe the difference between flash point and ignition temperature and use this information to explain whether the suspect's claim is true or untrue.

Paper is not good for spreading a fire and causing ignitions far from the initial heat source.

Detonation is characterized by very rapid oxidation that produces heat,light,and a subsonic pressure wave.

Explosives that decompose at relatively slow rates are classified as:

The following substances were found at the scenes of explosions.Indicate for each group of items if low,high,or a combination of explosives were used.If high explosives were used,indicate whether the components can be identified as primary or secondary explosives. a.Potassium nitrate,charcoal,sulfur b.PETN (pentaerythritoltetranitrate) c.Lead styphnate d.Ammonium nitrate and sodium nitrate gelled with guar gum e.Potassium chlorate mixed with sugar f.Triacetone triperoxide

A fire will burn until either the oxygen or the fuel is exhausted.

Which of the following is NOT a military explosive?

Two factors that influence the ________ of reaction of a fire are the physical state of the fuel and the temperature.

Metals,beams,nails,fasteners,and bolts are examples of good ________.

Arson investigators must work quickly to collect evidence at a fire scene because any accelerant residues may evaporate within a few days or even hours.

A procedure commonly used as a screening test for explosive residues is:

________ combustion is fire caused by a natural heat-producing process in the presence of sufficient air and fuel.