Computer Science/IT MCQs
Topic Notes: Computer Science/IT
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
4441
In the context of computer file formats, what does the acronym PDF signify?
Answer:
Portable Document Format
PDF stands for Portable Document Format. Developed by Adobe Systems, it is a widely used file format designed to present documents consistently across different software applications, hardware, and operating systems. This means a PDF document will look and behave the same regardless of what device or software is used to view it, preserving fonts, images, graphics, and the overall layout.
4442
What happens if you change a file's extension from ".txt" to ".jpg"?
Answer:
The file's contents remain the same, but the operating system will try to open it with an image viewer.
Changing a file's extension does not change the data inside the file. It only changes how the operating system identifies the file type, which will likely result in an error when trying to open it with the wrong program.
4443
What does the `.gz` extension signify (e.g., in `file.tar.gz`)?
Answer:
The file has been archived with tar and then compressed with Gzip
This is a common combination in the Linux/Unix world. `tar` groups the files, and `gzip` performs the compression on the resulting single `.tar` file.
4444
The concept of an "owner," a "group," and "others" is a common way to organize file permissions in which type of operating systems?
Answer:
Unix-like systems (Linux, macOS)
This user/group/other permission model is a hallmark of Unix-based file systems.
4445
Huffman coding is a well-known algorithm used in:
Answer:
Lossless data compression
Huffman coding is a famous lossless technique that assigns variable-length codes to input characters, with shorter codes assigned to more frequent characters. It is used in formats like PKZIP and Gzip.
4446
By default, where does Windows save the documents created in MS-Word?
Answer:
My Documents
The "My Documents" folder (or simply "Documents" in newer versions) is the default location where most Microsoft Office applications, including MS-Word, are set to save user-created files unless a different location is specified.
4447
What does the "rename" operation do?
Answer:
It changes the name of a file or directory
Renaming a file only modifies its metadata (specifically, its name) within the directory structure; the file's data content remains unchanged.
4448
Which term refers to a unit that combines data and functionality?
Answer:
Object
An object encapsulates both data and the methods that manipulate the data in object-oriented programming.
4449
If you try to open a compressed archive but you get an error like "archive is corrupt," what is the most likely cause?
Answer:
The file was not fully downloaded or was damaged during storage/transfer
A corrupted archive means the data within the file is damaged or incomplete, preventing the decompression algorithm from successfully reconstructing the original files.
4450
In a graphical user interface, what action typically opens a subfolder?
Answer:
Double-clicking on it
Double-clicking is the standard user action to navigate into a folder and view its contents in most modern graphical file explorers.