Forensics Chapter 14 & 15

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Which of the following is an accidental cause of fire?

Faulty wiring

What is a Molotov cocktail?

A concoction of fuels used to start a fire

What makes investigating arson cases difficult?

Act has been planned thoroughly, the perpetrator is not on the scene, the destruction is so extensive.

The depth of wood charring is called...

Alligatoring

Willfully and maliciously setting fire to or charring property.

Arson

A mixture of potassium or sodium nitrate, charcoal, and sulfur

Black powder

It merely burns when unconfined

Black powder

When smoke from a burning house moves upward and travel outside and sinks back to the ground, it exemplifies

Convection

Created after an explosion from loose soil which also yield debris for laboratory analysis

Crater

Dogs are used in fire investigation to...

Detect hydrocarbon accelerants

The product of combustion accompanied by the creation of gases and heat at a rapid rate.

Explosion

When the temperature is high enough to burn and vaporize a liquid, we say we have reached the...

Flash point

Where would you normally find telltale signs of arson?

Floor

A fuel will only ignite if it is in what state of matter?

Gas

Which of the following is an example of conduction?

Heat from a boiling pot of water travels through metal

When a substance burns, the heat produced is called

Heat of combustion

Can detonate almost instantaneously at rates of 1,000 to 8,500 meters per second

High explosives

Produce a shattering or smashing effect

High explosives

What is pyrolysis?

Hot solid turning into gas

What does a criminalist look for in a fire scene?

Identifiable chemicals

Which of the following is an example of a glowing combustion?

Lighted cigarette

This device is used to measure the speed of ions from vaporized residue of explosives

Ion Mobility Spectrometer (IMS)

Explosives with a velocity of detonation less than 1,000 meters per second

Low explosives

Have a slow burn rate

Low explosives

Produce a propelling or throwing action, making them suitable as propellants for ammunition or sky rockets

Low explosives

X-ray machines are useful in detecting bombs from...

Luggages, packages, laptops

To prevent contamination and diffusing of explosives, specimens must be placed in

Metal cans

Fires can be produced as air rushes backwards toward the explosion's origin

Natural gas

When mixed with air in confined space and ignited, will combust

Natural gas

A house with a V-shaped pattern of burning is an explanation...

Of the origin of fire.

To start a fire, you would need...

Oxygen, fuel, heat

What is the explanation for the occurrence of spontaneous combustion?

Poor ventilation and heat buildup

Can cause chain reaction with other explosives.

Primary explosives

Easily detonated by heat, shock, friction

Primary explosives

Will detonate violently instead of burning

Primary explosives

The hear from a flame travels by

Radiation

It is important in an investigation after an explosion to

Recover any trace of detonating device

To safety search ad collect bombs from a site, what must be used?

Robots controlled by teleoperators

What is as "sniffer"?

Searches for traces of flammable liquid residues.

Examples include TNT, TATP, C-4, and emulsion explosives

Secondary explosives

Relatively insensitive to heat, shock, or friction

Secondary explosives

Used in majority of chemical and military blasting.

Secondary explosives

Will normally burn rather than detonate

Secondary explosives

Consists of nitrated cotton (nitrocellulose) or nitroglycerin and nitrocellulose

Smokeless powder

Either single or double based powder

Smokeless powder

In order to find out what accelerant or fuel have been used in arson, what should be done to gather enough evidences?

Specimens around the area that have not been burned

Streamers are used to...

Spread fire

What is ignition temperature?

Temperature needed to ignite fuel spontaneously

The search of the fire scene must focus on finding

The origin of fire

Why is it necessary to place collected specimen in metal cans or glass for identification?

To prevent leaking of accelerants

Combustible liquids are rarely consumed during a fire.

True


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