Evidence and Investigation Unit Review

Evidence and Investigation Unit Review

Practice Question Answer Key

34. A

28. B

36. C

35. D

33. D

35. C

33. A

34. C

16. C

36. A

10. C

11. C

12. C

7. A

8. A

9. D

1.  Observations- evidence that you collect using the 5 senses or measurements; everyone gets the same observations; true information

2.  Inferences - and educated guess as to what happened

3.  Good inferences require good observations so that you can make the best guess as to what happened

4.  Chromatography is the study of ink. In order to separate ink into its colours:

a.  Draw a line about 2 cm above the bottom of the filter paper

b.  Place a small amount of water in the bottom of a beaker or jar

c.  Carefully hang the filter paper so only the tip is in the water

d.  Allow the water to travel up the filter paper, separating the ink. This may take a few minutes

e.  Remove the filter paper. Allow to dry.

f.  Record your observations.

g.  Dump the water out and begin again with a new sample.

5. Graphology is the study of handwriting/cursive writing. Characteristics that graphologist look at are size, spacing, loops, connecting lines, end strokes, quirks, etc.

6. Tests done in fabric analysis are colour/pattern, thread/weave, texture, water absorption, burn test.

7. Natural fibers burn to ash. Synthetic (man-made) can melt or leave a plastic like residue.

8. Soil analysis - colour, texture, odour, content, particle shape, particle size, location,

pH - tests the acidity of soil (acidic or basic)

9. Fingerprints:

Loop - the ridges will flow in one side, recurve, (loop

around) and exit the pattern on the same side as it entered.

Whorl- consists of a series of almost concentric

circles

Arch- ridges flow in one side and flow out the opposite side

Composite- combinations of arch, loop and whorl

*Review also: deltas, islands, bifurcation, ridge endings

10.

1)  Lightly dust the surface with powder (light powder on a dark surface, dark powder on a light surface).

2)  Brush away excess powder so only the fingerprint remains.

3)  Place a piece of tape over the fingerprint.

4)  Carefully lift the tape to remove the fingerprint from the surface.

5)  Place tape and lifted fingerprint on a piece of paper (dark paper for light powder, light paper for dark powder.

11. Best surface are hard and flat. Also, it is easiest to find a specific fingerprint in an area that is not touched by lots of people.

12. Running- prints are further apart, walking - prints are closer together.

Animals- have different stride patterns.

Carrying something- if it is one one side, the print may have a drag mark or be deeper because of the weight.