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 30

Blu-ray disc uses which laser color?
Blue-violet (405nm wavelength)
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Wi-Fi 6 (802.11ax) introduces?
OFDMA, MU-MIMO improvements and BSS Coloring for better multi-device efficiency
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4G LTE provides speeds up to?
100 Mbps to 1 Gbps (LTE-Advanced)
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iCloud is cloud storage by?
Apple
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OneDrive is cloud storage by?
Microsoft
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SaaS model means software is?
Delivered over internet as a service with no local installation
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Kubernetes etcd is?
Distributed key-value store holding cluster state and configuration
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The full form of CPU is?
Central Processing Unit
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Which memory stores data temporarily?
RAM
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DAC stands for?
Digital to Analog Converter
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Alt+F4 in Windows?
Closes current application/window
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Recycle Bin in Windows stores?
Temporarily deleted files before permanent removal
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To permanently delete without Recycle Bin use?
Shift+Delete
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PDF files are opened using?
Adobe Acrobat Reader or web browsers
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VLC Media Player is used for?
Playing various audio/video formats
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Which browser is developed by Google?
Chrome
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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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Computer Fundamentals → Generations of Computer 1

Which generation of computers used vacuum tubes?
First
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Computer Fundamentals → Input Devices 3

Which input device is used in ATMs?
Numeric keypad and card reader
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QWERTY keyboard gets its name from?
First six letters of top-left row
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Function keys on keyboard are labeled?
F1 to F12
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Computer Fundamentals → Output Devices 2

Which of the following is NOT an output device?
Keyboard
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Which type of printer makes physical impact on paper?
Dot matrix
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Computer Fundamentals → Memory Units 2

1 GB RAM equals?
1024 MB
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Which file extension indicates executable program in Windows?
.exe
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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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