MCQs

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Overall MCQs for Reference

1. What is data deletion in data science?
   a. Removing system logs
   b. Eliminating data from storage devices
   c. Formatting user interfaces
   d. Backing up information
   Answer: b. Eliminating data from storage devicessciencedirect​
2. Which method removes only file pointers but retains data?
   a. Physical deletion
   b. Logical deletion
   c. Cryptographic erasure
   d. Archival deletion
   Answer: b. Logical deletionsciencedirect​
3. Which technique overwrites files to prevent recovery?
   a. Data masking
   b. Wiping (overwriting)
   c. Indexing
   d. Sampling
   Answer: b. Wiping (overwriting)sciencedirect​
4. What is a common challenge in data deletion?
   a. Data redundancy
   b. Data remanence
   c. Data enrichment
   d. Data clustering
   Answer: b. Data remanencesciencedirect​
5. Which secure deletion method involves destroying the encryption key?
   a. Logical deletion
   b. Physical deletion
   c. Cryptographic erasure
   d. Incremental backup
   Answer: c. Cryptographic erasuresciencedirect​
6. What NIST publication provides guidance on secure data deletion?
   a. NIST SP 800-53
   b. NIST SP 800-88
   c. NIST SP 800-171
   d. NIST SP 800-115
   Answer: b. NIST SP 800-88sciencedirect​
7. What data deletion method is suitable for MCAR datasets?
   a. Listwise deletion
   b. Hot deck imputation
   c. Regression imputation
   d. Pairwise deletion
   Answer: a. Listwise deletiontowardsdatascience​
8. Which method deletes rows with any missing values?
   a. Listwise deletion
   b. Pairwise deletion
   c. Mean substitution
   d. Mode substitution
   Answer: a. Listwise deletiontowardsdatascience​
9. What deletion technique removes only some rows based on specific variables?
   a. Listwise deletion
   b. Pairwise deletion
   c. Complete case
   d. Random sampling
   Answer: b. Pairwise deletionalmabetter​
10. Which risk arises from careless data deletion?
    a. Data enrichment
    b. Loss of critical information
    c. Improved security
    d. Increased sample size
    Answer: b. Loss of critical informationtowardsdatascience​
11. What practice reduces human effort in data deletion on AWS?
    a. Manual audit
    b. S3 Lifecycle automation
    c. Data mining
    d. System reboot
    Answer: b. S3 Lifecycle automationaws.amazon​
12. What must businesses establish for responsible data deletion?
    a. Encryption standards
    b. Data destruction policy
    c. Activity logs
    d. Firewall rules
    Answer: b. Data destruction policybitraser​
13. What is a pitfall in data deletion from backup systems?
    a. Slow performance
    b. Incomplete deletion
    c. Enhanced privacy
    d. Improved compliance
    Answer: b. Incomplete deletionict4peace​
14. What technique destroys the physical storage media?
    a. Soft delete
    b. Physical destruction
    c. Logical deletion
    d. Data transfer
    Answer: b. Physical destructionsciencedirect​
15. Which method is recommended for sensitive data erasure?
    a. Overwriting with random characters
    b. Simple delete command
    c. Indexing
    d. De-duplication
    Answer: a. Overwriting with random characterssciencedirect​
16. What is an example of antiforensic deletion strategy?
    a. Data backup
    b. Data wiping
    c. Data indexing
    d. Data sampling
    Answer: b. Data wipingsciencedirect​
17. What does GDPR require regarding data deletion?
    a. Regular backups
    b. Personal data elimination
    c. Increased data collection
    d. Data anonymization
    Answer: b. Personal data eliminationsciencedirect​
18. Why is documentation important in deletion activities?
    a. Tracks data lineage
    b. Ensures compliance
    c. Improves algorithm speed
    d. Reduces file sizes
    Answer: b. Ensures complianceict4peace​
19. Which deletion protocol verifies irretrievability post-deletion?
    a. Zeroization
    b. Post-deletion check
    c. Redundancy removal
    d. Reindexing
    Answer: b. Post-deletion checkict4peace​
20. What is the effect of standard “delete” functions?
    a. Full data removal
    b. Pointer removal only
    c. Data encryption
    d. Physical destruction
    Answer: b. Pointer removal onlysciencedirect​
21. What is the Gutmann method in data deletion?
    a. Encryption algorithm
    b. Complex overwriting pattern
    c. Data transfer protocol
    d. Machine learning model
    Answer: b. Complex overwriting patternsciencedirect​
22. What must be done before applying listwise deletion?
    a. Completely backup data
    b. Determine relevant variables
    c. Encrypt the dataset
    d. Archive the database
    Answer: b. Determine relevant variablestowardsdatascience​
23. Which is an appropriate deletion method for data not needed for analysis?
    a. Data masking
    b. Variable exclusion
    c. Data compression
    d. Data replication
    Answer: b. Variable exclusiontowardsdatascience​
24. What deletion strategy is suited to cloud environments?
    a. Index deletion
    b. Encryption prior to deletion
    c. Listwise deletion
    d. Data augmentation
    Answer: b. Encryption prior to deletionict4peace​
25. Which method is used to delete rows with missing values for specific variables?
    a. Listwise deletion
    b. Pairwise deletion
    c. Block deletion
    d. Random sampling
    Answer: b. Pairwise deletionalmabetter​
26. What is a recommended frequency for deletion of unnecessary data?
    a. Quarterly
    b. Routine schedule
    c. Annually
    d. After project completion
    Answer: b. Routine scheduleict4peace​
27. What is a critical component of data disposal for compliance?
    a. Staff training
    b. Data visualization
    c. Indexing
    d. Regression testing
    Answer: a. Staff trainingict4peace​
28. Which deletion method is not suitable for files with sensitive information?
    a. Simple delete command
    b. Overwriting
    c. Physical destruction
    d. Key destruction
    Answer: a. Simple delete commandesecurityplanet​
29. What does a secure deletion strategy for backups require?
    a. Encryption keys
    b. Protocol establishment
    c. Simple deletion
    d. Dataset augmentation
    Answer: b. Protocol establishmentict4peace​
30. What is a common MCQ distractor for data cleaning?
    a. Deleting all data points
    b. Preparing data for analysis
    c. Adding erroneous values
    d. Indexing irrelevant files
    Answer: a. Deleting all data pointst4tutorials​
31. What deletion option ensures cloud provider compliance?
    a. Routine audits
    b. Solid destruction measures
    c. Index recalculation
    d. Machine learning simulation
    Answer: b. Solid destruction measuresict4peace​
32. What is not a deletion technique in databases?
    a. Manual deletion
    b. Automated tool usage
    c. Data backup
    d. Index archiving
    Answer: c. Data backupalooba​
33. What outcome is expected from ignoring deletion documentation?
    a. Enhanced compliance
    b. Loss of deletion traceability
    c. Reduced risk
    d. Quick recovery
    Answer: b. Loss of deletion traceabilityict4peace​
34. Which deletion method is scalable for large data volumes?
    a. Manual entry
    b. Automated protocol
    c. Simple backup
    d. Data sampling
    Answer: b. Automated protocolict4peace​
35. What best practice is important for offboarding employees?
    a. Secure deletion of their data
    b. Data transfer
    c. Data visualization
    d. Data merging
    Answer: a. Secure deletion of their dataict4peace​
36. Which method is considered fastest for data deletion?
    a. Manual deletion
    b. Automated lifecycle rules
    c. Physical destruction
    d. Encryption
    Answer: b. Automated lifecycle rulesaws.amazon​
37. What term is used for deletion that only removes index references?
    a. Logical deletion
    b. Hard deletion
    c. Secure erasure
    d. Permanent removal
    Answer: a. Logical deletionsciencedirect​
38. What should be verified after data deletion in forensic analysis?
    a. Media type
    b. Data irretrievability
    c. Encryption status
    d. Sample size
    Answer: b. Data irretrievabilityict4peace​
39. What is the primary goal of cryptographic erasure?
    a. Make data unrecoverable
    b. Increase data transfer speed
    c. Reduce storage costs
    d. Enhance redundancy
    Answer: a. Make data unrecoverablesciencedirect​
40. What is required to securely delete magnetic media?
    a. At least one overwhelming pass
    b. Basic deletion command
    c. Data transfer
    d. Data compression
    Answer: a. At least one overwhelming passsciencedirect​
41. What is an important consideration in physical data destruction?
    a. Environmental impact
    b. Data encryption
    c. Storage cost
    d. Database size
    Answer: a. Environmental impactict4peace​
42. What is the purpose of maintaining deletion logs?
    a. To track deletion activities for auditing
    b. To visualize data
    c. To backup data
    d. To compress files
    Answer: a. To track deletion activities for auditingict4peace​
43. What deletion technique is most appropriate for hardware disposal?
    a. Logical deletion
    b. Physical destruction
    c. Data cleansing
    d. Data transformation
    Answer: b. Physical destructionsciencedirect​
44. What is a drawback of manual deletion?
    a. Incomplete deletion
    b. Fast execution
    c. Decreased risk
    d. Reduced retention period
    Answer: a. Incomplete deletionict4peace​
45. What approach safeguards privacy while deleting data?
    a. Secure deletion techniques
    b. Data masking
    c. Routine indexing
    d. Irregular backups
    Answer: a. Secure deletion techniquessciencedirect​
46. What process is critical before disposing old equipment?
    a. Secure data deletion
    b. Reformatting only
    c. Antivirus installation
    d. Data migration
    Answer: a. Secure data deletionict4peace​
47. Which deletion method is least secure for sensitive information?
    a. Simple OS delete
    b. Gutmann method
    c. Schneier method
    d. Key destruction
    Answer: a. Simple OS deleteesecurityplanet​
48. What is a common outcome from improper deletion of backup data?
    a. Data exposure
    b. Data compression
    c. Enhanced performance
    d. Reduced cloud cost
    Answer: a. Data exposureict4peace​
49. Which protocol aids compliance in cloud storage deletion?
    a. Scheduled audits
    b. Automated deletion lifecycle
    c. Manual entry verification
    d. CSV import
    Answer: b. Automated deletion lifecycleaws.amazon​
50. What is the principal aim of secure data deletion in data science?
    a. Prevent unauthorized access
    b. Increase storage usage
    c. Enhance visualization
    d. Improve indexing
    Answer: a. Prevent unauthorized accesssciencedirect+1​

1. https://www.sciencedirect.com/topics/computer-science/data-deletion
2. https://towardsdatascience.com/handling-missing-data-like-a-pro-part-1-deletion-methods-9f451b475429/
3. https://www.almabetter.com/bytes/tutorials/data-science/data-cleaning-in-data-science
4. https://docs.aws.amazon.com/wellarchitected/latest/analytics-lens/best-practice-13.1-remove-unused-data-and-infrastructure..html
5. https://www.bitraser.com/blog/10-crucial-data-erasure-best-practices/
6. https://ict4peace.org/publications/tool-5-best-practices-for-data-destruction/
7. https://www.esecurityplanet.com/compliance/data-deletion-methods-for-sensitive-data/
8. https://t4tutorials.com/data-cleaning-mcqs/
9. https://www.alooba.com/skills/concepts/relational-databases-8/deleting-data/
10. https://www.gyansetu.in/blog/data-science-objective-type-mcq-quiz-interview-preparation/
11. https://www.sanfoundry.com/1000-data-science-questions-answers/
12. https://interviewkickstart.com/blogs/articles/data-science-mcq-answers
13. https://www.scribd.com/document/856379688/Data-Science-100-MCQs
14. https://www.sanfoundry.com/data-mining-questions-answers-data-cleaning-data-integration/
15. https://www.interviewbit.com/data-science-mcq/
16. https://www.placementpreparation.io/mcq/data-science/page/2/
17. https://www.geeksforgeeks.org/data-analysis/data-cleansing-introduction/
18. https://www.zendata.dev/post/data-retention-policy-101-best-practices-for-storing-and-deleting-data-responsibly
19. https://scholarexpress.com/multiple-choice-questions-on-data-science/
20. https://www.tableau.com/learn/articles/what-is-data-cleaning