UF Exam #1 Questions with correct answers
Which is not true about surface tension of a blood droplet?
A. Surface tension is created by cohesive forces in a blood droplet
B. It helps form a skin on the droplet surface
C. The tension of blood is more than water
D. Surface tension pulls the droplet into its absolute smallest volume - ✔✔C. The
surface tension of blood is LESS than water
T/F: the greater the viscosity of a fluid, the more slowly it will flow. - ✔✔TRUE.
fluids that are more viscous have slow flow characteristics.
Passive drops of blood in air occur when? Example: blood dripping from a small
wound. - ✔✔When the gravitational pull on the drop overcomes the cohesive
forces of the blood source
Blood stains that are circular in shape have usually impacted their target surface
at what angle? - ✔✔90 degrees
During bloodstain development, in which phase does the surface tension try to
pull the fluid of the stain back into a single form? - ✔✔Retraction (phase 4)
During bloodstain development, in which phase does the droplet begin to
collapse from the bottom upward? - ✔✔Contract and collapse (phase 1)
T/f: When a blood spot impacts on a hard, smooth, non-porous target surface, the
resulting spot generally has little, if any spatter. - ✔✔TRUE
,T/F: the narrow end of an elongated bloodstain generally points in the direction
of travel. - ✔✔TRUE
Bloodstain pattern analysis can provide valuable information on:
A. Sequence of events
B. Droplet directionality
C. Blood trail motion
D. All of the above - ✔✔D. All of the above
In a stain created by a hair swipe, the appearance of trailers of stain leading away
from the parent stain is know as:________________ - ✔✔Feathering
T/F: the dispersion of small blood droplets due to forceful projection of blood is
called spatter. - ✔✔TRUE
Which is not true:
A. The amount of spatter found on a target surface is directly related to the
volume available at the source
B. The amount of spatter is inversely proportional to the amount of energy
causing the spatter
C. As a form of physical evidence, all spatter patterns have class characteristics -
✔✔B. The amount of spatter and the resulting pattern is proportional to the
amount of energy causing the spatter
,T/F: all blood droplets projected at the same speed will have the same flight
pattern - ✔✔FALSE - they will all have different parabolas
Smaller= more air resistance and less distance
Larger= less air resistance and more distance
The pointed edge characteristics that radiate away from the center of a
bloodstain are called:______________ - ✔✔Spines
The formation depends on the impact velocity and surface texture
What is Forensic Science? - ✔✔The application of science in a legal environment
What is the aim of a forensic scientist? - ✔✔To objectively examine evidence in a
scientific manner and present the results clearly?
What did Edmond Locard Discover? - ✔✔That when two objects came into
contact that there was a bi-directional transfer of material between the 2 objects.
He called this the Locard Exchange Principle.
What is Forensic Serology? - ✔✔The investigation and analysis of biological
evidence such as blood and other bodily fluids as a means of identification and
reconstruction of crime scenes
When did Karl Landsteiner first observe the agglutination of human blood cells
with human sera and determine that blood could be distinguished by specific
types? - ✔✔1901
, Who discovered that blood could be distinguished by a specific group or type
leading to the development of ABO blood typing? - ✔✔Karl Landsteiner
When were the first attempts to try and identify reddish brown stains on clothing
as blood and presumptive tests used? - ✔✔1800s
When was the first confirmatory test for hemoglobin developed? By Who? -
✔✔1853 - Ludwig Teichman
When was a method for distinguishing between animal and human proteins first
published? By Who? - ✔✔1901 - Paul Theodor Uhlenhuth
When were methods developed for grouping dried blood stains? By Who? -
✔✔1915 - Leones Lattes
When were Rhesus blood factors identified? By Who? - ✔✔1915 - Landsteiner &
Weiner
When were the Ouchterlony species identification tests developed? By Who? -
✔✔1949 - A. Ochterlony
When were tests developed for species identification using mixed agglutination
methods? By Who? - ✔✔1960 - Stuart S. Kind
When were polymorphic variants of the phosphoglucomutase (PGM) enzyme
identified? By Who? - ✔✔1964 - Brain Culliford
Which is not true about surface tension of a blood droplet?
A. Surface tension is created by cohesive forces in a blood droplet
B. It helps form a skin on the droplet surface
C. The tension of blood is more than water
D. Surface tension pulls the droplet into its absolute smallest volume - ✔✔C. The
surface tension of blood is LESS than water
T/F: the greater the viscosity of a fluid, the more slowly it will flow. - ✔✔TRUE.
fluids that are more viscous have slow flow characteristics.
Passive drops of blood in air occur when? Example: blood dripping from a small
wound. - ✔✔When the gravitational pull on the drop overcomes the cohesive
forces of the blood source
Blood stains that are circular in shape have usually impacted their target surface
at what angle? - ✔✔90 degrees
During bloodstain development, in which phase does the surface tension try to
pull the fluid of the stain back into a single form? - ✔✔Retraction (phase 4)
During bloodstain development, in which phase does the droplet begin to
collapse from the bottom upward? - ✔✔Contract and collapse (phase 1)
T/f: When a blood spot impacts on a hard, smooth, non-porous target surface, the
resulting spot generally has little, if any spatter. - ✔✔TRUE
,T/F: the narrow end of an elongated bloodstain generally points in the direction
of travel. - ✔✔TRUE
Bloodstain pattern analysis can provide valuable information on:
A. Sequence of events
B. Droplet directionality
C. Blood trail motion
D. All of the above - ✔✔D. All of the above
In a stain created by a hair swipe, the appearance of trailers of stain leading away
from the parent stain is know as:________________ - ✔✔Feathering
T/F: the dispersion of small blood droplets due to forceful projection of blood is
called spatter. - ✔✔TRUE
Which is not true:
A. The amount of spatter found on a target surface is directly related to the
volume available at the source
B. The amount of spatter is inversely proportional to the amount of energy
causing the spatter
C. As a form of physical evidence, all spatter patterns have class characteristics -
✔✔B. The amount of spatter and the resulting pattern is proportional to the
amount of energy causing the spatter
,T/F: all blood droplets projected at the same speed will have the same flight
pattern - ✔✔FALSE - they will all have different parabolas
Smaller= more air resistance and less distance
Larger= less air resistance and more distance
The pointed edge characteristics that radiate away from the center of a
bloodstain are called:______________ - ✔✔Spines
The formation depends on the impact velocity and surface texture
What is Forensic Science? - ✔✔The application of science in a legal environment
What is the aim of a forensic scientist? - ✔✔To objectively examine evidence in a
scientific manner and present the results clearly?
What did Edmond Locard Discover? - ✔✔That when two objects came into
contact that there was a bi-directional transfer of material between the 2 objects.
He called this the Locard Exchange Principle.
What is Forensic Serology? - ✔✔The investigation and analysis of biological
evidence such as blood and other bodily fluids as a means of identification and
reconstruction of crime scenes
When did Karl Landsteiner first observe the agglutination of human blood cells
with human sera and determine that blood could be distinguished by specific
types? - ✔✔1901
, Who discovered that blood could be distinguished by a specific group or type
leading to the development of ABO blood typing? - ✔✔Karl Landsteiner
When were the first attempts to try and identify reddish brown stains on clothing
as blood and presumptive tests used? - ✔✔1800s
When was the first confirmatory test for hemoglobin developed? By Who? -
✔✔1853 - Ludwig Teichman
When was a method for distinguishing between animal and human proteins first
published? By Who? - ✔✔1901 - Paul Theodor Uhlenhuth
When were methods developed for grouping dried blood stains? By Who? -
✔✔1915 - Leones Lattes
When were Rhesus blood factors identified? By Who? - ✔✔1915 - Landsteiner &
Weiner
When were the Ouchterlony species identification tests developed? By Who? -
✔✔1949 - A. Ochterlony
When were tests developed for species identification using mixed agglutination
methods? By Who? - ✔✔1960 - Stuart S. Kind
When were polymorphic variants of the phosphoglucomutase (PGM) enzyme
identified? By Who? - ✔✔1964 - Brain Culliford
