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
5071
Why is it important to be cautious when opening files with an ".exe" extension from an unknown source?
Answer:
They can contain malicious software (viruses, malware) that can harm your computer.
Since ".exe" files are executable programs, they can be used to deliver and run malicious code on a computer. It's crucial to only run executable files from trusted sources.
5072
If you add two 4-bit numbers, what is the maximum number of bits the result could have?
Answer:
5
The largest 4-bit number is 1111 (15). 1111 + 1111 = 11110 (15 + 15 = 30). The result requires 5 bits to be fully represented.
5073
What is the value of the Boolean expression (1 + 0) · 1?
Answer:
1
Evaluate the parentheses first: 1 OR 0 is 1. Then, 1 AND 1 is 1.
5074
In the context of computer science and digital information, what does the acronym BIT unequivocally represent?
Answer:
Binary Digit
The term 'BIT' is an acronym derived from 'Binary Digit.' It is the most fundamental unit of information in computing and digital communications. A bit can represent one of two states, conventionally expressed as 0 or 1, true or false, or on or off. This two-state nature is the foundation of all digital data storage and processing.
5075
The number (7B)₁₆ is a number in which system?
Answer:
Hexadecimal
The presence of the letter 'B' and the subscript '16' indicates that this is a hexadecimal (base-16) number.
5076
Which character encoding standard was developed to overcome the limitations of ASCII?
Answer:
Unicode
Unicode was created to be a universal character set, with the goal of representing every character from every language in the world.
5077
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.
5078
If you are denied permission to save a file in a certain directory, what is the most likely reason?
Answer:
You do not have "write" permission for that directory.
Write permission on a directory is required to create new files within it.
5079
What is a `.rar` file?
Answer:
A type of compressed archive, similar to a `.zip` file.
RAR (Roshal Archive) is another popular format for file compression and archiving.
5080
A file that is marked as "read-only" can be:
Answer:
Opened, but not modified or saved.
The read-only attribute is a specific permission setting that prevents writing to the file.