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WorksheetsQuiz 4 FINALS FORENSIC CHEM
Total questions: 35
Worksheet time: 19mins
Metallography is an art of extracting and working in metals by application and physical knowledge.
TRUE
FALSE
Used to identify defects in metal surfaces, to determine the crystal grain boundaries in metal alloys, and to study rocks and minerals.
Metallurgical Microscope
Metallurgy
Spectroscopy
Metallography
Theft is the act or an instance of illegally taking something that belongs to somebody else, especially by using force, threats, or violence.
TRUE
FALSE
It is a unique number or marking stamped on the metal surface which are assigned for identification of many consumer products and commercial items.
(a)
A Serial Number is said to be tampered if:
The letterings are not aligned
The Letterings are of the same sizes
The Letterings have the same appearance (ex. font)
There are no scratches
Etching fluid are applied to the surface, the disturbed or strained particles of the metal differ in the rate of permeability than those of the undisturbed particles and this difference in permeability makes it possible in many cases, to remove the number , to restore the number to such an extent that they can be read and photographed.
TRUE
FALSE
Etching fluid for Tin:
10% hydronitric acid
10% hydrochloric acid
10% hydrofluoric acid
10% hydrosulfuric acid
Cast coin is done by making an impression of a coin on a metal blank by pressure.
TRUE
FALSE
The details of the profile, the letterings and numerals of counterfeit coins are of high relief that they can be felt distinctly by running the fingers on these features. The readings are deep and even.
TRUE
FALSE
These are physical tests used in the examination of counterfeit coin except:
Specific density
Mint Mark
Materials Testing
Density
It is the process by which the casing of a projectile from a bomb, barrel bomb, land mine, IED, artillery, rocket, missile, grenade, etc. is shattered by the detonation of the explosive filler.
(a)
It is a set of various chemical processes that determine the chemical, physical and biological soil properties important for plant nutrition.
(a)
This is a type of soil that remain at the place of their formation as a result of the weathering of the parent rocks.
Desert Soil
Residual Soil
Mountain Soil
Laterite Soil
It is formed when a soil-carrying stream gradually loses its carrying capacity with decreasing velocity.
Marine Soil
Alluvial Soil
Cohesive Soil
Peaty and Marshy Soil
Once the soil samples are collected, these should be packed in such a manner that there physical state undergoes a maximum alteration.
TRUE
FALSE
Soil is analyzed by comparing these 5 elements.
pH, Particle Size, Weight, Magnetism, Color
Color, Particle Size, Density, Magnetism, pH
Density, Magnetism, Solubility, pH, Particle Size
Magnetism, Turbidity, pH, Particle Size, Density
Soil is 25% air, 25% water,45% mineral particles and 5% organic matter.
TRUE
FALSE
It is commonly determined by adding distilled water to a soil sample and gently mixing the two.
Soil pH
Soil Density
Soil Composition
Soil Magnetism
For the preservation of Soil Sample, all samples should be taken to a lab, unopened, immediately after collection. If this isn’t possible for any reason, they need to be placed into an open air, well lighted storage space that has a temperature of about 21 degrees Celsius.
TRUE
FALSE
It is fine, dry powder consisting of tiny particles of earth or waste matter lying on the ground or on surfaces or carried in the air.
(a)
Dirt is an unclean matter, especially when in contact with a person's clothes, skin or possessions.
TRUE
FALSE
In the Collection and Submission of Dust and Dirt Specimen, the following are true except:
Use a natural bristle brush to collect the samples.
Wear a white clean room garment, hat and booties over the clothing when collecting evidence from the crime scene.
Plastic containers should be used because they often possess an electrostatic charge that can attract foreign dust traces.
One must keep in mind that dust traces, due to their nature, are easily lost. the paper packaging should be free of small holes.
It is capable of providing an elemental analysis of extremely small particles and is thus well suited to the analysis of dust particles.
X-Ray Spectroscopy
Microchemical Analysis
Microscopy
Classical Microchemistry
DNA stands for (a) . It is a complex molecule that contains all of the information necessary to build and maintain an organism.
DNA also serves as the primary unit of heredity in organisms of all types. It means, whenever organisms reproduce, a portion of their DNA is passed along to their offspring.
TRUE
FALSE
Evidences such as blood, saliva, sperm, hair, tissue, bones, teeth, or other body fluids are called (a) .
DNA is present in red blood cells of humans, but not white blood cells which lack nuclei.
TRUE
FALSE
DNA from sperm tail is usually the most important source of DNA evidence for sexual assault cases.
TRUE
FALSE
It is commonly used in landscaping, gardens, and lawns as well as for filling in low areas or creating walkways.
(a)
Hair pulled from the body do not contain DNA and it can no longer be used for DNA Analysis.
TRUE
FALSE
It is one of the best sources of DNA from decomposed human remains.
Hair
Blood
Bone
Saliva
In the forensic crime laboratory, “serology analysis” refers to the screening of evidence for bodily fluids, whereas “DNA analysis” refers to the efforts to individualize bodily fluids to a specific person. In most cases, DNA Analysis is performed on evidentiary items before bodily fluid identification is attempted.
TRUE
FALSE
PCR is a test to detect genetic material from a specific organism, such as a virus. PCR stands for (a) .
Semen, Vaginal or Rectal cells is usually found on which evidence:
Used cigarette
Bite Mark
Used condom
Toothpick
Bonus Item
Yes
No
