Forensic Physics

Forensic Physics Quiz Crafted by-

 Vivek Khare

Senior Scientific Officer,

Sherlock Institute of Forensic Science

Introduction to Forensic Physics

Forensic Physics is the application of physics for the purpose of civil and criminal law. It involves the examination of paint, glass, soil, fibers, tool marks, etc. Tool marks are made when a harder surface comes in contact with a softer surface. They are encountered at burglary crime scenes which involves forcible entry. Toolmark identification aims to identify tools as the source of marks on crime scenes. Tools leave unique marks on surfaces such as firearms identification which deals with marks left behind by bullets, cartridge cases, and shotshell components. A comparison microscope is used for the purpose of comparison of evidence tool marks found at crime scenes with test tool marks as a comparison microscope allows side by side comparison.

 Let's look at the questions and their answers:

Ques 1. Immersion method is used for the measurement of –

a) Refractive index

b) Density

c) Refraction

d) All

Answer-a) Refractive index

Ques 2. ‘Radial crack from a right angle on revere side of impact’ is better known as-

a) 2R rule

b) 3R rule

c) 4R rule

d) Crack rule

Answer-b) 3R rule                                                     


Ques 3. Pigment composition in paint can be analyzed through-

a) NAA

b) AAS

c) X-ray Diffraction

d) TLC

Answer-d) TLC


Ques 4. Sieve test is performed to determine-

a) RI

b) Density

c) Fineness

d) Strength

Answer-c) Fineness


Ques 5. Length of skid marks is-

a) Directly proportionate to velocity

b) Inversely proportionate t velocity

c) Directly proportionate to square root of velocity

d) Inversely proportionate to square root of velocity

Answer-c) Directly proportionate to square root of velocity


Ques 6. Tool marks is not easy to identify in case of-

a) Iron

b) Aluminum

c) Copper

d) Rubber

Answer-d) Rubber


Ques 7. Tool marks can be preserved by using-

a) Plasticine

b) Plaster of Paris

c) Dental mass

d) All

Answer-d) All


Ques 8. The parent material of the soil is

a) Plant

b) Animal

c) Rock

d) Silica

Answer-c) Rock


Ques 9. Red soil contain-

a) Copper in reduced form

b) Copper in iodized form

c) Copper in oxidized form

d) Iron in reduced form

Answer-a) Copper in reduced form


Ques 10. Tool marks are most common in the case of-

a) Homicide

b) Burglary

c) Sexual assault

d) Theft

Answer-b) Burglary


Ques11. Which of the following statements is not true?

a) Glass has an unusual property of non-crystalline.

b) First type of synthetic glass was soda lime.

c) Glass is a supercooled liquid.

d) Pyrex is one of the most common trade names of soda lime glass.

Answer- d) Pyrex is one of the most common trade names of soda lime glass.


Ques 12. RRR formula in glass examination is useful in ascertaining

a) The Refractive Index of the glass sample.

b) The Density of the glass sample.

c) To determine the side from which force has been applied.

d) The Hardness of the glass sample.

Answer- c) To determine the side from which force has been applied.


Ques 13. Pyrolysis gas chromatography is useful technique for characterization of the following paint constituents:

a) Pigment

b) Binder

c) Lacquer

d) Solvent

Answer- b) Binder


Ques 14. The main components of Portland cement are:

a) Aluminium oxide

b) Calcium oxide

c) Silicon oxide

d) Both a and c

Answer- d) Both a and c


Ques 15. Who introduced the density gradient tube technique for the comparison of two paint samples?

a) W.M. Kraft

c) F. Mair

c) J. Martin

d) P.L. Kirk

Answer- d) P.L. Kirk

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