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Computer Fundamentals → Introduction to Computer 39

Which of the following is NOT an OOP concept?
Normalization
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Encapsulation in OOP means?
Hiding implementation details inside objects
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Inheritance in OOP allows?
One class to derive properties from another
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Polymorphism means?
Many forms — same interface, different implementations
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Which is an object-oriented programming language?
Java
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A database index improves?
Data retrieval speed
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Primary key in a database must be?
Unique and not null
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Foreign key creates a relationship between?
Two different tables
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Normalization in databases aims to?
Reduce data redundancy and improve integrity
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Which SQL command retrieves data?
SELECT
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Which SQL command adds new records?
INSERT INTO
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Which SQL command modifies existing records?
UPDATE
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Which SQL command removes records?
All of these remove records
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What does JOIN do in SQL?
Combines rows from two or more tables
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An API stands for?
Application Programming Interface
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REST API uses which protocol?
HTTP/HTTPS
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JSON stands for?
JavaScript Object Notation
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XML stands for?
Extensible Markup Language
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Which of the following is NOT a programming paradigm?
Encryption
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The full form of CPU is?
Central Processing Unit
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Which key combination is used to select all in Windows?
Ctrl+A
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Which component converts DC power to AC for use in a computer?
UPS
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A modem's speed is measured in?
bps
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The resolution of a standard Full HD display is?
1920×1080
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4K resolution refers to approximately?
Both B and C
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Refresh rate of 60 Hz means?
Screen refreshes 60 times per second
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Which of the following stores the currently executing program?
RAM
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The extension of a Python source file is?
.py
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Which programming concept prevents code duplication?
Inheritance and functions
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A null pointer points to?
Address 0 or no valid address
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Which of these is a compiled language?
C/C++
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Which is an interpreted language?
Python
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The OSI model has how many layers?
7
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Which OSI layer handles routing?
Layer 3
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TCP/IP model has how many layers?
4
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Which device works at Data Link Layer (Layer 2)?
Switch
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MAC address has how many bytes?
6
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ARP stands for?
Address Resolution Protocol
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ICMP is used for?
Network diagnostics (ping)
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Computer Fundamentals → Memory Units 1

Which JOIN returns all records from both tables?
FULL OUTER JOIN
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