# 50+ Big Data Analytics MCQ Questions with Answers (2026 Edition)

Preparing for a data analytics interview or want to test your knowledge of the Big Data ecosystem? You're in the right place. Multiple-choice questions are a fantastic way to quickly assess your understanding of key concepts and technologies.

Below are the Top 10 most critical interview questions you MUST know. Test yourself, and then download our full 50+ MCQ PDF at the bottom of the page!

## Essential Fundamentals

1. Which characteristic of Big Data refers to the "trustworthiness" or accuracy of the data?

- a) Velocity
- b) Veracity
- c) Volume
- d) Variety

Answer: b) Veracity

Explanation: Veracity deals with the noise, abnormality, and uncertainty in data, ensuring the data used for decisions is accurate.

2. Data that does not have a pre-defined data model (like video files or social media posts) is called?

- a) Structured Data
- b) Semi-structured Data
- c) Unstructured Data
- d) Relational Data

Answer: c) Unstructured Data

## Hadoop Ecosystem Architecture

3. In the Hadoop ecosystem, what is the specific role of YARN?

- a) Distributed Storage
- b) Data Ingestion
- c) Resource Management and Job Scheduling
- d) Graph Processing

Answer: c) Resource Management and Job Scheduling

4. Which daemon in HDFS is known as the "Master" node that manages the file system namespace?

- a) DataNode
- b) NameNode
- c) TaskTracker
- d) JobTracker

Answer: b) NameNode

5. Hive is a component of Hadoop that is primarily used for?

- a) Real-time video streaming
- b) Data Warehousing & SQL-like querying (HQL)
- c) Machine Learning algorithm training
- d) UI Dashboard Design

Answer: b) Data Warehousing & SQL-like querying (HQL)

## Apache Spark & NoSQL

6. What is the fundamental, low-level data structure of Apache Spark?

- a) DataFrame
- b) RDD (Resilient Distributed Dataset)
- c) DataSet
- d) Relational Table

Answer: b) RDD (Resilient Distributed Dataset)

7. Spark is significantly faster than Hadoop MapReduce mainly because it performs computations in _____?

- a) Local Disk
- b) External Cloud
- c) Memory (RAM)
- d) Solid State Drives

Answer: c) Memory (RAM)

8. In the CAP Theorem for NoSQL databases, 'C' stands for _____?

- a) Complexity
- b) Consistency
- c) Calculation
- d) Concurrency

Answer: b) Consistency

## Advanced Architecture

9. What is the main performance bottleneck for the Hadoop MapReduce framework?

- a) Slow RAM speed
- b) High Disk I/O overhead between job stages
- c) Network latency
- d) Lack of indexing

Answer: b) High Disk I/O overhead between job stages

10. A "Data Lake" is best described as a repository for storing _____?

- a) Highly structured, clean SQL data only
- b) Both structured and unstructured raw data at massive scale
- c) Only PDF and Word documents
- d) Deleted or archived log files

Answer: b) Both structured and unstructured raw data at massive scale

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### Additional SEO Keywords and Big Data Questions

11. What is the primary goal of Big Data Analytics? Answer: To uncover hidden patterns and unknown correlations for business value.

12. Which "V" refers to the speed at which data flows into an organization? Answer: Velocity.

13. Which of the following is an example of Big Data visualization? Answer: Tableau Dashboards.

14. The two core components of Hadoop 1.x are: Answer: HDFS & MapReduce.

15. What is the default replication factor in Hadoop HDFS? Answer: 3.

16. Which tool is specifically used for moving data between HDFS and Relational Databases? Answer: Sqoop.

17. What language is used to write scripts in Apache Pig? Answer: Pig Latin.

18. Which component manages job workflow and scheduling in Hadoop? Answer: Oozie.

19. HDFS is designed for which type of hardware? Answer: Commodity Hardware.

20. The NameNode keeps its metadata in: Answer: RAM.

21. Which Spark library is used for graph processing and analysis? Answer: GraphX.

22. MongoDB is an example of which type of NoSQL database? Answer: Document Store.

23. Which database follows the Column-Family store model? Answer: Apache Cassandra.

24. Which NoSQL category is best for social network analysis? Answer: Graph Database.

25. Redis is primarily used as a: Answer: Caching/Key-Value Store.

26. What is the role of Apache Zookeeper? Answer: Distributed Coordination & Management.

27. In Apache Spark, a "map()" operation is a: Answer: Transformation.

28. Which of the following is used for real-time log ingestion? Answer: Apache Flume.

29. Which command in Hive describes the structure of a table? Answer: DESCRIBE TABLE_NAME.

30. AWS EMR stands for: Answer: Elastic MapReduce.