
Quiz-1 (G2)
Authored by Dr Kumar
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10 questions
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1.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
Which of the following challenges arise when integrating heterogeneous data sources into a data warehouse?
Schema integration
Handling missing values
Faster query processing
Data format inconsistencies
2.
FILL IN THE BLANK QUESTION
1 min • 1 pt
The process of selecting the most relevant features in a large dataset is called ___________.
3.
FILL IN THE BLANK QUESTION
1 min • 1 pt
In OLAP, the operation that aggregates data from a lower level to a higher level (e.g., from daily to monthly) is called ___________.
4.
FILL IN THE BLANK QUESTION
1 min • 1 pt
The process of reducing the number of dimensions in a dataset while retaining key information is called ___________.
5.
MULTIPLE SELECT QUESTION
1 min • 1 pt
Which of the following operations in OLAP allow better multi-dimensional analysis?
Drill-down
Roll-up
Histogram equalization
Slice and Dice
6.
FILL IN THE BLANK QUESTION
1 min • 1 pt
In ETL (Extract, Transform, Load), the step where raw data is cleaned and formatted before being loaded into a warehouse is called ___________.
7.
FILL IN THE BLANK QUESTION
1 min • 1 pt
Principal Component Analysis (PCA) reduces dimensionality by transforming correlated features into a set of ___________ variables.
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