Computer Science
Multiple Choice
Questions
(MCQs) – Sets 35
with Detailed Explanations
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SET 35 – Computer Science MCQs
✅ No repetition from Sets 1–34
✅ 10 completely new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is SQL?
A. Programming language for games
B. Operating system
C. Language used to manage databases
D. Web browser
✅ Correct Answer: C
Explanation:
SQL stands for Structured Query Language. It is used to communicate with databases by inserting, updating, deleting, and retrieving data. SQL helps manage large amounts of structured data efficiently and is widely used in database systems such as MySQL, Oracle, and PostgreSQL.
2. What is SELECT command in SQL?
A. Deletes data
B. Updates data
C. Retrieves data from database
D. Creates table
✅ Correct Answer: C
Explanation:
The SELECT command in SQL is used to retrieve specific data from a database table. It allows users to filter, sort, and display data according to conditions. SELECT is the most commonly used SQL command for generating reports and analysis.
3. What is INSERT command?
A. Remove data
B. Add new data into table
C. Modify data
D. Search data
✅ Correct Answer: B
Explanation:
The INSERT command is used to add new records into a database table. It ensures that new data is stored properly according to table structure. INSERT is essential for updating databases with new information such as new students or transactions.
4. What is UPDATE command?
A. Create table
B. Retrieve data
C. Change existing data
D. Delete table
✅ Correct Answer: C
Explanation:
The UPDATE command modifies existing records in a database table. It is used when stored information needs correction or updating. Conditions can be applied to update specific records without affecting the entire table.
5. What is DELETE command?
A. Insert record
B. Modify record
C. Remove records from table
D. Create database
✅ Correct Answer: C
Explanation:
The DELETE command removes one or more records from a database table. It should be used carefully, as deleted data may not be recoverable. Conditions help control which records are removed to prevent data loss.
6. What is WHERE clause?
A. Database name
B. Table creation
C. Condition used in SQL commands
D. Output format
✅ Correct Answer: C
Explanation:
The WHERE clause is used to apply conditions in SQL commands. It helps filter records based on specific criteria. WHERE ensures that operations like SELECT, UPDATE, or DELETE affect only relevant data.
7. What is ORDER BY clause?
A. Deletes data
B. Sorts the result
C. Inserts records
D. Encrypts data
✅ Correct Answer: B
Explanation:
ORDER BY is used to sort query results in ascending or descending order. Sorting helps organize data for better understanding and presentation. It is commonly used in reports and analysis tasks.
8. What is DISTINCT keyword?
A. Deletes duplicates
B. Shows unique values
C. Sorts data
D. Updates table
✅ Correct Answer: B
Explanation:
DISTINCT is used in SELECT queries to display only unique values from a column. It removes duplicate entries from results without affecting actual data in the table. DISTINCT improves clarity in data analysis.
9. What is NULL value?
A. Zero value
B. Empty string
C. Missing or unknown data
D. Error
✅ Correct Answer: C
Explanation:
A NULL value represents missing or unknown information in a database. It is not equal to zero or an empty space. Handling NULL values properly is important to ensure accurate calculations and queries.
10. What is DROP command?
A. Remove database objects
B. Insert data
C. Retrieve data
D. Update records
✅ Correct Answer: A
Explanation:
The DROP command permanently removes database objects such as tables or databases. Once dropped, the data cannot be recovered easily. It is used carefully when objects are no longer needed.
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