IRS_Quiz

A large repository of documents in IR is called _______

• Corpus

• Database

  
  

• Dictionary

• Collection

An inverted index is a database index that ______

• stores mapping from documents to words

  
  

• stores, for each term t, the list of all documents that contain term t

• orders the terms in a different order which is not a sequential order

• All of the above

The number of times that a word or term occurs in a document is called _______

• Document frequency

• Term frequency

• Collection frequency

• Indexing granularity

_______ is the process of reducing inflected (or sometimes derived) words to their base or root form.

• Tokenization

• Stop words elimination

• Stemming

• lemmatization

A model of information retrieval in which we can pose any query in which search terms are combined with the operators AND, OR, and NOT.

• Ad hoc retrieval mode

• Ranked retrieval model

• Boolean retrieval model

• Proximity query model

Which of the following is not a classical model of information retrieval?

• Boolean 
  

• Cluster

• Probablistic

• Vector Space

In information retrieval, extremely common words which would appear to be of little value in helping select documents and are excluded from the index vocabulary are called _________

• Stop words

• Tokens

• Lemmatized words

• Stemmed terms

Which of the following is/are classical IR models?

• Vector model
  

• Boolean model

• Interaction model

• Cluster model

_______ is a compressed trie of all the suffixes of a given string.

• Suffix Array

• Signature Files

• Trie

• Suffix tree

What is the disadvantage of Boolean retrieval model?

• Easy to implement
  

• Difficult to rank output

• Difficult to process a query

• It is one of the complex retrieval models