Stains Analysis in Forensics
Stains Analysis in Forensics Quiz Crafted By-
Aastha Verma
Scientific Officer
Sherlock Institute of Forensic Science India Pvt. Ltd, New Delhi
Introduction to Stains Analysis in Forensics
Bloodstain pattern analysis (BPA) is the interpretation of bloodstains at a crime scene in order to recreate the actions that caused the bloodshed. Analysts examine the size, shape, distribution and location of the bloodstains to form opinions about what did or did not happen. BPA uses principles of biology (behavior of blood), physics (cohesion, capillary action and velocity) and mathematics (geometry, distance, and angle) to assist investigators in answering questions such as:
- Where did the blood come from?
- What caused the wounds?
- From what direction was the victim wounded?
- How were the victim(s) and perpetrator(s) positioned?
- What movements were made after the bloodshed?
- How many potential perpetrators were present?
- Does the bloodstain evidence support or refute witness statements?
Let's look at the questions and their answer.
Ques 1. After collecting the blood stained soil from the scene, it should be sent for examination
a) As such without drying
b) After drying in the oven
c) After drying under fan
d) After drying under shade
Answer-d) After drying under shade
Ques 2. Which of the following information cannot be obtained by the examination of bloodstain?
a) Race
b) Sex
c) Cause of death
d) Origin
Answer- c) Cause of death
Ques 3. One of the following tests is used to determine the species of origin from bloodstain:
a) Acid Phosphate
b) Teichmann
c) Fluorescence
d) Immunoprecipitation
Answer- d) Immunoprecipitation
Ques 4. Which of the following test is not a catalytic color test for blood stains?
a) O-toluidine
b) Tetramethylbenzidine
c) Adler’s test
d) Teichmann’s test
Answer- d) Teichmann’s test
Ques 5. Confirmation of menstrual blood stain is done by the following method
a) Isoenzyme marker
b) Fibrin Degradation Product (FDP)
c) Protein Marker
d) Restriction Enzymes
Answer- b) Fibrin Degradation Product (FDP)
Ques 6. Presumptive test for blood stain except
a) Leuco-malachite Green
b) Phenolphthalein
c) Periodic Acid Schiff
d) Tetramethyl benzene
Answer- c) Periodic Acid Schiff
Ques 7. The shapes of spatter stains of blood are affected by the _______ of impact.
a) Length
b) Breadth
c) Width
d) Angle
Answer- d) Angle
Ques 8. Correct sequence for examination of an unknown blood stain?
a) Spectroscopic examination, Benzidine, Hemochromogen, Absorption-Inhibition
b) Absorption-Inhibition, Benzidine Test, Spectroscopic Examination, Ring assay
c) Kastle-Meyer’s Test, Teichmann Test, Oakley-Fulthrope method, Mixed-Agglutination test
d) Lattes Crust Method, Absorption-Elution Method, Single diffusion assay, RNA-based assays
Answer- c) Kastle-Meyer’s Test, Teichmann Test, Oakley-Fulthrope method, Mixed-Agglutination test
Ques 9. Florence test for the detection of seminal stains depends on the formation of :
a) Choline Iodide
b) Hematin
c) Seminal Vesicle Specific Antigen
d) Creatine Phosphokinase
Answer- a) Choline Iodide
Ques 10. In soaking method, the seminal stain is cut and soaked in _________.
a) Mineral water
b) MQ Water
c) Picric Acid
d) Acidulated Water
Answer- d) Acidulated Water