Glass as Forensic Evidence
Glass as Forensic Evidence Quiz Crafted By-
Aastha Mahna
Team Member
Sherlock Institute of Forensic Science India Pvt. Ltd, New Delhi
Introduction to Glass as Forensic Evidence
Glass can be found in most localities. It is produced in a wide variety of forms and compositions, and these affect the properties of this material. It can occur as evidence when it is broken during the commission of a crime. Broken glass fragments ranging in size from large pieces to tiny shards may be transferred to and retained by nearby persons or objects. The mere presence of fragments of glass on the clothing of an alleged burglar in a case involving entry through a broken window may be significant evidence if fragments are found. The significance of such evidence will be enhanced if the fragments are determined to be indistinguishable in all measured properties from the broken window. On the other hand, if the recovered fragments differ in their measured properties from the glass from the broken window, then that window can be eliminated as a possible source of the glass on the subject’s clothing
Let's look at the questions and their answer.
Ques 1. Glass is a solid that is not crystalline but rather has an ----- structure
a) Liquid
b) Solidified liquid
c) Amorphous
d) None of these
Answer-c) Amorphous
Ques 2. Atoms of an amorphous solid have a ------ arrangement
a) Regular orderly
b) Irregular
c) Random
d) Irregular and random
Answer- d) Irregular and random
Ques 3. Soda-lime glass is commonly used in
a) Windshields
b) Mirrors & Windshields
c) Bottles
d) Windows & bottles
Answer- d) Windows & bottles
Ques 4. In which year, Corning glass company found that the addition of 10-15% boron oxide to glass made the resulting product more shock and heat resistant.
a) 1912
b) 1921
c) 1950
d) 1933
Answer- a) 1912
Ques 5. What is the advantage of adding PbO to glass?
a) High resistance
b) High brilliance
c) High lustre
d) None of these
Answer- b) High brilliance
Ques 6. Tempered glass is how many times stronger than normal window glass?
a) Four times
b) Six times
c) Two times
d) Three times
Answer- a) Four times
Ques 7. The non optical physical properties of a glass include
a) Surface curvature
b) Texture
c) Both a&b
d) None of these
Answer- c) Both a&b
Ques 8. What does Mohs scale represent?
a) A substance’s softness relative to other substances
b) A substance’s hardness relative to other substances
c) A substance’s diameter relative to other substances
d) None of these
Answer- b) A substance’s hardness relative to other substances
Ques 9. Glass may be subjected to which of these forces?
a) Compressive force
b) Tensile force
c) Shear force
d) All of these
Answer- d)All of these
Ques 10. Examination of the edges of a broken piece of Glass will reveal a set of curved lines known as ------
a) Striation marks
b) Skid marks
c) Rib marks
d) Both b&c
Answer- c) Rib marks