Quick Revision

GK One-Line Question & Answer

15541+ short questions with short answers, covering every category and sub-category on the site — no long articles to scroll through. Good for a fast recap before an exam, or a few minutes of daily practice.

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Computer Fundamentals → Introduction to Computer 36

YouTube is owned by?
Google (Alphabet)
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WhatsApp is owned by?
Meta (Facebook)
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Logic error in programming is?
Program compiles but gives wrong results due to incorrect algorithm
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Algorithm must have?
Finite, unambiguous steps with definite input/output and effectiveness
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Flowchart uses which shape for decision?
Diamond
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Which flowchart shape represents start/end?
Oval/Rounded rectangle
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Which data structure is used for function call stack?
Stack (LIFO)
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Binary search requires input data to be?
Sorted (ascending or descending)
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What is the time complexity of binary search?
O(log n)
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Recursion is?
Function that calls itself with smaller input toward base case
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Stack overflow error in recursion occurs when?
Too many recursive calls exhaust the call stack
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Object in OOP is?
An instance of a class with specific attribute values
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Which OOP concept allows same method to work differently based on object type?
Polymorphism
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Which Java collection preserves insertion order?
ArrayList and LinkedList
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HashMap in Java provides?
Unsorted key-value pairs with O(1) average get/put
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Which exception handling block always executes?
finally
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Java 8 introduced?
Lambda expressions, Stream API, Optional
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Singleton pattern ensures?
Only one instance of a class exists throughout the application
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SSH uses which port?
22
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DNS uses which port?
53
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DHCP uses which ports?
67 and 68
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HTTP default port is?
80
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HTTPS uses which port?
443
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FTP uses which ports?
20 and 21
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SMTP uses which port?
25
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Which protocol provides time synchronization?
NTP (Network Time Protocol)
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LinkedIn is owned by?
Microsoft
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Which is NOT a programming language?
HTML
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Assembler converts?
Assembly language to machine code (object code)
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Linker combines?
Object files and libraries into a single executable
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Which flowchart shape represents input/output?
Parallelogram
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Which data structure is used for breadth-first search?
Queue (FIFO)
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Which searching algorithm works on unsorted data?
Linear (sequential) search
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Abstraction in OOP means?
Hiding implementation details, exposing only essential interfaces
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Constructor in OOP is called?
Automatically when a new object is created
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Static method in OOP belongs to?
The class itself — called without creating an object
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Computer Fundamentals → Software and Hardware 2

Compiler translates?
Entire program at once to machine code before execution
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Interpreter translates?
Line by line during execution
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Computer Fundamentals → Internet Basics 2

Which protocol enables email clients to download messages?
POP3 and IMAP
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Which is the most popular search engine globally?
Google
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