Class 12 Computer Science Practice Questions

Q1. Which SQL command is used to retrieve data from a database? 💻

1. SELECT
2. DELETE
3. INSERT
4. UPDATE

Q2. What does IP stand for in networking? 💻

1. Information Packet
2. Internet Protocol
3. Internal Process
4. Integrated Program

Q3. Which type of cyberattack involves overwhelming a server with traffic? 💻

1. Ransomware
2. Denial of Service (DoS)
3. Phishing
4. Trojan Horse

Q4. In a relational database, the primary key is used to: 💻

1. Link to other tables only
2. Sort the records
3. Encrypt the data
4. Uniquely identify each record

Q5. Which of the following is an example of a NoSQL database? 💻

1. PostgreSQL
2. Oracle
3. MySQL
4. MongoDB

Q6. HTTP stands for: 💻

1. HyperText Transfer Protocol
2. Host Text Transfer Protocol
3. High Text Transfer Protocol
4. HyperText Transmission Process

Q7. Which Python library is commonly used for data analysis? 💻

1. Pandas
2. Tkinter
3. Flask
4. Pygame

Q8. What is the full form of LAN? 💻

1. Leased Access Network
2. Local Area Network
3. Linked Area Network
4. Large Area Network

Q9. Recursion in programming means: 💻

1. A function calling itself
2. Reusing code from other programs
3. Running a loop indefinitely
4. Calling multiple functions simultaneously

Q10. Which is the correct SQL syntax to add a new column to an existing table? 💻

1. UPDATE TABLE table_name ADD COLUMN column_name
2. MODIFY TABLE table_name ADD column_name datatype
3. ALTER TABLE table_name ADD column_name datatype
4. INSERT COLUMN INTO table_name column_name datatype

Q11. Which SQL command is used to retrieve data from a database?

1. SELECT
2. INSERT
3. UPDATE
4. DELETE

Q12. Which SQL command adds new rows to a table?

1. SELECT
2. INSERT
3. DELETE
4. DROP

Q13. Which SQL command removes rows from a table?

1. SELECT
2. INSERT
3. DELETE
4. CREATE

Q14. Which SQL command modifies existing data in a table?

1. SELECT
2. DELETE
3. INSERT
4. UPDATE

Q15. Which language is used to structure the content of web pages?

1. HTML
2. Python
3. SQL
4. C++

Q16. Which number system, using only 0 and 1, do computers use internally?

1. Decimal
2. Binary
3. Octal
4. Hexadecimal

Q17. Which number system uses base 16?

1. Binary
2. Decimal
3. Hexadecimal
4. Octal

Q18. In OOP, which concept bundles data and methods and hides internal details?

1. Inheritance
2. Polymorphism
3. Recursion
4. Encapsulation