Computer Science
Multiple Choice
Questions
(MCQs) – Sets 32
with Detailed Explanations
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SET 32 – Computer Science MCQs
✅ No repetition from Sets 1–31
✅ 10 completely new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is a database?
A. Programming language
B. Operating system
C. Organized collection of data
D. Computer virus
✅ Correct Answer: C
Explanation:
A database is an organized collection of data stored electronically so that it can be easily accessed, managed, and updated. Databases are used in schools, banks, hospitals, and websites. They allow fast searching, sorting, and reporting of information, making data handling efficient and reliable.
2. What is DBMS?
A. Data Backup Management System
B. Digital Business Model System
C. Database Management System
D. Data Bit Memory System
✅ Correct Answer: C
Explanation:
DBMS stands for Database Management System. It is software used to create, manage, and control databases. Examples include MySQL and Oracle. A DBMS helps users store data securely, reduce duplication, and perform operations like insertion, deletion, and updating efficiently.
3. What is a table in a database?
A. Spreadsheet only
B. File folder
C. Data stored in rows and columns
D. Network device
✅ Correct Answer: C
Explanation:
A table is a basic structure in a database where data is stored in rows and columns. Each row represents a record, and each column represents a field. Tables make data organized, readable, and easy to process using database queries.
4. What is a record?
A. Column name
B. Database software
C. Complete set of related fields in a table
D. Data type
✅ Correct Answer: C
Explanation:
A record is a complete row in a database table containing related information about one item or person. For example, a student’s record may include name, roll number, and class. Records help store and retrieve detailed information efficiently.
5. What is a field?
A. Entire table
B. Database file
C. Single piece of data in a record
D. Software tool
✅ Correct Answer: C
Explanation:
A field is a single data item or column in a database table. Each field stores a specific type of information, such as name or age. Fields define the structure of a database and help maintain consistency and accuracy of stored data.
6. What is primary key?
A. Duplicate field
B. Password
C. Unique identifier for records
D. Data backup
✅ Correct Answer: C
Explanation:
A primary key is a field that uniquely identifies each record in a table. It prevents duplicate entries and ensures data integrity. For example, a roll number or employee ID can be used as a primary key in a database system.
7. What is data redundancy?
A. Data security
B. Data encryption
C. Unnecessary duplication of data
D. Data compression
✅ Correct Answer: C
Explanation:
Data redundancy occurs when the same data is stored in multiple places unnecessarily. It wastes storage space and can cause inconsistency. Database normalization helps reduce redundancy and improves data accuracy and efficiency.
8. What is data consistency?
A. Data speed
B. Data size
C. Same data having same value everywhere
D. Data deletion
✅ Correct Answer: C
Explanation:
Data consistency ensures that data remains uniform and accurate across the database. When data is updated in one place, it should reflect correctly everywhere. Consistency is important to maintain trust and correctness in database systems.
9. What is a query?
A. Hardware command
B. Database error
C. Request to retrieve specific data
D. Virus
✅ Correct Answer: C
Explanation:
A query is a request made to a database to retrieve or manipulate data. Queries help users search, filter, and display required information. They are essential for generating reports and extracting meaningful insights from large databases.
10. What is data backup?
A. Data sharing
B. Data deletion
C. Copy of data for recovery
D. Data formatting
✅ Correct Answer: C
Explanation:
Data backup is the process of creating copies of important data to protect against loss due to system failure, cyberattacks, or accidental deletion. Regular backups ensure data recovery and continuity of work in case of emergencies.
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