CSS - PMS - CCE - PCS - General Science
Data Science
What is a common risk of biased training data?
A. The monitor loses power
B. The CPU clock always slows
C. All data becomes encrypted
D. The model may produce systematically unfair or inaccurate outputs for some groups or situations
Correct Answer: D
Models can reproduce and amplify patterns present in biased or unrepresentative data.
CSS - PMS - CCE - PCS - General Science
Data Science
What is a database query used for?
A. Retrieving or manipulating data according to specified conditions
B. Cooling a server
C. Measuring voltage
D. Drawing a circuit
Correct Answer: A
Queries express operations such as selecting, filtering, joining or aggregating data.
CSS - PMS - CCE - PCS - General Science
Data Science
What is a data visualization?
A. A hardware driver
B. A graphical representation of data used to communicate patterns or comparisons
C. A password list
D. A binary file only
Correct Answer: B
Charts and plots can make trends and relationships easier to interpret.
CSS - PMS - CCE - PCS - General Science
Data Science
Why is a train-test split used?
A. To encrypt half the records
B. To change labels
C. To double the dataset physically
D. To evaluate how well a model generalizes to unseen data
Correct Answer: D
Testing on held-out data estimates out-of-sample performance.
CSS - PMS - CCE - PCS - General Science
Data Science
What is correlation?
A. Proof that one variable causes another
B. A type of database key only
C. A statistical measure of association between variables
D. A file compression method
Correct Answer: C
Correlation quantifies association but does not by itself establish causation.
CSS - PMS - CCE - PCS - General Science
Data Science
What is a target variable?
A. A data cable
B. A random folder
C. The outcome a supervised model is trained to predict
D. A chart title only
Correct Answer: C
In supervised learning, the target is the labeled output.
CSS - PMS - CCE - PCS - General Science
Data Science
What is a feature in machine learning?
A. An input variable used by a model
B. A password
C. A model's final prediction only
D. A CPU fan
Correct Answer: A
Features are measurable attributes supplied to a model.
CSS - PMS - CCE - PCS - General Science
Data Science
What is exploratory data analysis (EDA)?
A. A backup protocol
B. Final hardware assembly
C. A web browser feature
D. Initial investigation of data using summaries and visualizations
Correct Answer: D
EDA helps reveal patterns, anomalies and relationships before formal modeling.
CSS - PMS - CCE - PCS - General Science
Data Science
What is data cleaning?
A. Detecting and correcting or handling inaccurate, missing or inconsistent data
B. Encrypting data only
C. Printing a dataset
D. Deleting every record
Correct Answer: A
Data cleaning improves data quality before analysis or modeling.
CSS - PMS - CCE - PCS - General Science
Data Science
What is data science?
A. Only data entry
B. Only computer repair
C. An interdisciplinary field that extracts knowledge and insight from data
D. A type of cable
Correct Answer: C
Data science combines statistics, computing, domain knowledge and communication.