Try the multiple choice questions below to test your knowledge of Chapter 3. Once you have completed the test, click on 'Submit Answers for Grading' to get your results.

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This activity contains 10 questions.

	Which of the following is an example of a natural fibre?   Acrylic. Rayon. Sisal. Polyester.

	Which of the following statements is true?   The death of an individual is typically followed by a dramatic increase in the rate of loss of transferred fibres from the deceased’s body and clothing. A fibre may be defined as any long, thin, flexible, solid object with a high transverse cross-section area to length ratio. The re-transfer of items of trace evidence via two intermediary objects is known as secondary transfer. The likelihood of the transfer of fibres is heightened by violent contact.

	Which of the following techniques is not routinely used for recovering recently transferred fibres from an object?   Using a vacuum cleaner fitted with a specialist attachment that directs the stream of air onto a paper or fabric filter. Submerging the object in a dense liquid to allow fibres to float to the surface. Hand picking with tweezers. Making tape lifts.

	The phase in the growth cycle of an individual hair in which the hair is actively growing is known as the:   telogen phase. anaphase. catagen phase. anagen phase.

	Which of the following statements is not true?   There is considerable variation in the morphological characteristics of the hairs of any one individual. The cuticle and the cortex are two morphological features that are always present in human hair. The root of a human scalp hair that was pulled out while the hair was actively growing is characteristically club-shaped. Morphology can reveal differences between hairs taken from the same body location of different individual humans.

	Which of the following statements is true?   When a sheet of glass is broken by two successive impacts yet remains intact, it may be possible to deduce from the fracture patterns which impact occurred first. Toughened glass is glass that has been made by sandwiching plastic film between sheets of ordinary glass. Laminated glass is glass that has been heat-treated to introduce internal stresses within its fabric. The stress marks on the edge of a fractured piece of glass are typically V-shaped.

	The ratio of the speed of light in a vacuum to the speed of light in a particular medium is known as the medium’s:   polarization. retention time. birefringence. refractive index.

	Which of the following statements is true?   At any one location, soils do not vary in their characteristics with increasing depth. A soil profile is a horizontal section taken through a particular soil. Comparison between soils using density gradient tubes is capable of individualising soils. Soil structure is the arrangement of voids, individual soil particles and aggregates of these particles within a soil.

	Which of the following analytical techniques, based on the Bragg equation, may be used to reveal the crystalline components of paints on the basis of their crystal structures?   microspectrophotometry. X-ray powder diffraction. Raman spectroscopy. infrared spectroscopy.

	To answer this question correctly, you may have to choose more than one response. Which of the following is a type of vibrational spectroscopy?   Raman spectroscopy. X-ray powder diffraction. Atomic absorption spectroscopy. Infrared spectroscopy.

Some questions in this exercise may have more than one correct answer. To answer such questions correctly, you must select all the correct answers. Also note that answer choices in this exercise appear in a different order each time the page is loaded.

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