Data Mining and Warehousing MCQ with Answer

Q.no 31. In a decision tree each leaf node represents

A : Test conditions
B : Class labels
C : Attribute values
D : Decision

Q.no 32. The Galaxy Schema is also called as

A : Star Schema
B : Snowflake schema
C : Fact constellation
D : Database schema

Q.no 33. For mining frequent itemsets, the Data format used by Apriori and FP
Growth algorithms are

A : Apriori uses horizontal and FP-Growth uses vertical data format
B : Apriori uses vertical and FP-Growth uses horizontal data format
C : Apriori and FP-Growth both uses vertical data format
D : Apriori and FP-Growth both uses horizontal data format

Q.no 34. The property of Apriori algorithm is

A : All nonempty subsets of a frequent itemsets must also be frequent
B : All empty subsets of a frequent itemsets must also be frequent
C : All nonempty subsets of a frequent itemsets must be not frequent
D : All nonempty subsets of a frequent itemsets can frequent or not frequent

Q.no 35. It is the main technique employed for data selection.

A : Noise
B : Sampling
C : Clustering
D : Histogram

Q.no 36. The probability of a hypothesis before the presentation of evidence is
called as

A : Apriori probability
B : subjective probability
C : posterior probability
D : conditional probability

Q.no 37. In which step of Knowledge Discovery, multiple data sources are
combined?

A : Data Cleaning
B : Data Integration
C : Data Selection
D : Data Transformation

Q.no 38. Some company wants to divide their customers into distinct groups to
send offers this is an example of

A : Data Extraction
B : Data Classification
C : Data Discrimination
D : Data Selection

Q.no 39. The accuracy of a classifier on a given test set is the percentage of

A : test set tuples that are correctly classified by the classifier
B : test set tuples that are incorrectly classified by the classifier
C : test set tuples that are incorrectly misclassified by the classifier
D : test set tuples that are not classified by the classifier

Q.no 40. Which of the following is measure of document similarity?

A : Cosine dissimilarity
B : Sine similarity
C : Sine dissimilarity
D : Cosine similarity

Answer for Question No 31. is b
Answer for Question No 32. is c
Answer for Question No 33. is d
Answer for Question No 34. is a
Answer for Question No 35. is b
Answer for Question No 36. is a
Answer for Question No 37. is b
Answer for Question No 38. is b
Answer for Question No 39. is a
Answer for Question No 40. is d