Questions for Form C

1. Give a regular expression like those in the text for the Oxford English Dictionary, to find dates in the 19th or 20th centuries.

2. Which of the following is not a file structure used in IR systems:

   a.Flat files. b.Graphs. c.Inverted files. d.PAT trees. e.Queues.

3. A facet is like a(n):

   a.Attribute. b.Model. c.Object. d.Operation. e.System.

4. What is the difference between stemming and truncation?

5. How can a distance function relate to obtaining a similarity measure? How do the two differ?