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WorksheetsForensic Chemistry Pre Board 2026
Total questions: 55
Worksheet time: 55mins
The following are the role of a Forensic Chemist in criminal investigation, EXCEPT;
Conducts autopsy to a dead body.
Conducts examination in the identification of explosive ingredients.
Conducts examination whether a location is a clandestine laboratory.
Conducts blood alcohol concentration determination.
If an alleged blood stains are found on movable objects like hammer and knife, who is the ideal person to collect the said stain?
Forensic Chemist
police investigator
Lawyer
arresting officer
Which field of forensic science is dealing with the application of chemical principles in detecting and solving crimes?
Forensic Chemistry
Forensic Toxicology
Forensic Medicine
Forensic Ballistic
The following are importance of macro-etching in criminal investigation, EXCEPT?
The actual date and time the property was purchased can be determined.
Conflicting claims of properties recovered by investigators can be resolved.
The property found in the possession of the suspect can be proven that it is actually owned by the victim.
The property that may have been taken from the scene of the crime can be established.
In forensic chemistry, which principle is involved in the preliminary test for blood?
Oxidation
Reduction
Dehydration
Hydration
On what instance an examiner will NOT need an authorization from the court before conducting and analysis and examination of a document?
physical test causing no perceptible changes
physical test causing perceptible changes
Chemical test
burning test to determine the loading materials
Which of the fibers below will smell like burning hair when tested?
Animal fibers
Synthetic fibers
Vegetables fibers
Cotton fibers
What fibers when undergoing a burning test turned to ash and no solid debris?
Vegetables fibers
Animal fibers
Human hairs
Synthetic fibers
What non-destructive test is ideal in the examinations of hair and fibers?
Microscopic examination
Chemical immersion test
Burning test
Compression test
Scientifically, what is the reason why gunshot residue (GSR) can (or may) be detected and located in the hand of the firer?
Because of the forces of the gas that resist against the air causing it to move backward
Because the firer doesn’t wash his hand
Because the firer is firing towards the direction of the air
Because the skin attracted the residue of the gunpowder
Whether an alleged blood stain is really blood, which type of test will a forensic chemist conduct?
Confirmatory
Precipitin
Blood grouping
Preliminary
In order to determine whether hair that is collected at the crime scene is naturally fallen or forcibly pulled, which part of the hair will a forensic chemist examine?
Root
Shaft
Tip
The whole hair
Applying the principles of forensic chemistry in the collection of physical evidence in crime detection and investigation, the following statements are correct, EXCEPT?
An airtight container is used as a packaging material for bloodstained clothing.
Each item collected at the crime scene must be placed in a container.
Collection of questioned specimens is always accompanied by a standard specimen.
Collection of physical evidence can be done by specialized/trained police investigators.
The following are applications of metallurgy as part of forensic chemistry examination to crime detection and investigation, EXCEPT?
DPA-paraffin test
Nail examination
Counterfeit coins
Restoration of tampered serial numbers
In forensic chemistry analysis of presence of gunpowder residue in the suspect's hands, the following are factors to be considered in the interpretation of Diphenylamine (DPA) test, EXCEPT?
Color reaction
Time of reaction
Number of blue specks
Location and character of the blue specks
This is an appendage of the skin found all over the body of a human being, except on the palm or sole of the feet.
Hair
Fingerprint
Skin
Fibers
These are designed and placed by the manufacturers of paper to distinguish it from the others and to establish ownership, originality, and authenticity. What is this?
Watermarks
Kiss marks
Hallmarks
All marks
How do you call that intermediate layer of the human hair?
Cortex
Medulla
Cuticle
Roots
What parts of the hairs are important to make it a piece of substantial DNA evidence?
Roots
Medulla
Cuticle
Cortex
In the illustration below, locate where the medulla of the hair is.
I
II
III
IV
The following can be determined in microscopic examination for hair, EXCEPT?
The approximate age of the person who owns the hair.
The region from which the human hair has been removed.
How the hair was removed whether naturally or forcibly
Whether the hair was cut with dull or sharp instrument or was burned or crushed
Which of the following is the most conclusive test for fibers?
Microscopic test
Burning test
Fluorescence test
Chemical test
Sentence completion. The conduct of Paraffin-DPA test will produce positive when there is the presence of ____________________________.
Deep blue specks found both on the dorsal and palmar aspects of the hands
Deep blue specks on the dorsal aspects of the hands
Deep blue specks found on the five fingers of the hands
Deep blue conglomeration on the dorsal aspects of the hands
In burning test or ignition test, which of the following fibers does not burn?
Mineral
Animal
Vegetable
Synthetic
The following are purposes of hair examination, EXCEPT?
to determine the cause of death of the victim.
to determine whether the questioned hair originated from animal or human
to determine whether there was a contact between two or more individuals.
to determine whether an individual caused a contact to an object in question.
In the diphenylamine test, the positive color for subjects who had been suspected of firing a gun is what?
Blue
Red
Green
Yellow
Hair and fiber evidence gathered must not be intermingled because they are very susceptible to what?
cross contamination
breaking
damage
loss
Careful scrutiny is made once examining a paper. The most common examinations being conducted in document examination are the following, EXCEPT one.
Medical examination
Microscopic
Chemical
Physical
Which fiber appears flat, ribbon-like, twisted spirally left or right to its axis when observed under the microscope,?
Cotton
Wool
Linen
Hair
Which of the following fibers emits a bluish fluorescence when subjected under a UV light?
Cotton
Cotton
Nylon
Linen
If there is the blackening of area around the bullet perforation as a result of a shooting incident, forensic chemists will call it as what?
Smudging
Tattooing
Carbon collar
Carbon soot
What is the probable distance of the shooter to the victim when gaping-hole, singeing, smudging, and tattooing are the characteristic patterns observed on a gunshot wound on the clothing of the victim?
0 to 2 inches
Beyond 36 inches
2 to 8 inches
2 to 36 inches
Which of the following are classifications of explosives according to composition and structure?
Organic and inorganic
Industrial
High
Military
An example of these fibers is glass wool and asbestos.
synthetic
animal
vegetable
cotton
Propellants are classified as what explosives?
Low
Primary
High
Initiating
Peppering or stippling as gunpowder deposit is also known as what?
Tattooing
Blackening
Singeing
Smudging
Matching perforated edges is an examination by matching the edge of the object in question and is applied on what?
Paper
Blood
Gunpowder
Ink
Thin-layer chromatography is a useful examination in the analysis of what?
Ink
Poison
Gunpowder
Hairs and fibers
What specimen/evidence is usually submitted in the determination of gunshot range or distance determination?
Clothing of the victim
Both hands of the suspect
Firearm
All of the of these
The alleged suspect in a shooting incident must be subjected for paraffin-diphenylamine test in a crime laboratory within how many hours?
72 hours
48 hours
78 hours
36 hours
For a forensic chemistry laboratory analysis of hair, as a representative head hair samples, how many strands are to be collected and submitted?
12 strands
3 strands
6 strands
no definite number of strands
When the firearm is discharged at a distance of 2 inches to 8 inches from the gun barrel to the body of the victim, what characteristics patterns will be observed?
Smudging and tattooing
Tattooing
Singeing, tattooing, smudging
Tattooing is seldom present
Which of the following is the correct percent composition of a black powder as a bullet propellant?
75% potassium nitrate, 10% sulfur, 15% carbon
70% potassium nitrate, 10% carbon, 15% sulfur
75% potassium nitrate, 10% sulfur, 15% carbon
78% potassium nitrate, 15% sulfur, 10% carbon
Which of the following is NOT a characteristic of human hair?
Medulla is always present
MI is less than 0.5
Pigment granules are fine
Scale pattern overlaps up to 4/5.
What term is called when a black, coarsely peppered pattern is observed around the gunshot wound?
Tattooing
Smudging
Carbon collar
Singeing
Which test shall apply to determine the fiber, loading and sizing composition of paper?
Chemical
Physical test
Spectrographic test
Microscopic test
The obscuring of writing in a document by superimposing of an ink or any marking material is known as what?.
obliterated writing
contact writing
invisible writing
indented writing
What is the main component of paper?
Fiber
Loading
Sizing
Watermark
The percentage of alcohol in the blood of a person who is suspected to be deeply intoxicated with liquor is______________.
0.50%
0.20%
0.18%
0.10%
What is the other name for grain alcohol which is the component of wines and liquors?
Ethyl alcohol
Methyl alcohol
Propyl alcohol
Butyl alcohol
If alcohol is found inside the human body, through what route is it best eliminated or excreted?
Urine
Perspiration
Feces
Saliva
When the percentage of alcohol in the blood is between 0.35 to 0.60%, what is the stage of intoxication?
Coma or death
Stupor
Stimulation
Confusion
What field is dealing with the uses, effects and modes of action of drugs?
Posology
Pharmacology
Pharmacy
Pharmacists
In making a forensic report on a DNA analysis, some biological specimens listed below as primary source of DNA should be enumerated and elaborated EXCEPT?
Hair without follicles or roots
Semen and seminal stains
Blood and blood stains
Bones
As an expert witness, a forensic chemist must explain before the court that the hereditary material that contains the genetic information necessary for the duplication of cells and production of proteins in all living organisms is known in scientific field as what?
Deoxyribonucleic acid
Cells
Chromosome
Enzymes
