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
5021
In the realm of digital electronics, how are AND, OR, and NOT commonly categorized?
Answer:
Logic Gates
AND, OR, and NOT are fundamental components in digital circuits, performing basic logical operations on one or more binary inputs to produce a single binary output. They are collectively known as Logic Gates because they implement the elementary Boolean functions that form the basis of all digital computation. Arithmetic gates would perform operations like addition or subtraction, while memory gates would be associated with data storage. Interface gates typically manage communication between different system components.
5022
When converting binary to octal, bits are grouped in sets of:
Answer:
3
Since 2³ = 8, each group of three binary digits corresponds to exactly one octal digit.
5023
What is a self-extracting archive?
Answer:
An executable file that can extract its own contents without needing separate software.
This is convenient for sending compressed files to someone who may not have the necessary decompression utility.
5024
[cite_start]Which is the largest unit of data storage? [cite: 428]
Answer:
Word
Among the options provided, a "word" is the largest. [cite: 429] A bit is the smallest unit (a single 0 or 1). [cite_start]A byte is a group of 8 bits. [cite: 430] [cite_start]A computer "word" refers to the natural unit of data used by a processor, which is typically larger than a byte and can be 16, 32, or 64 bits long depending on the computer's architecture. [cite: 431]
5025
A major disadvantage of lossy compression is:
Answer:
There is a permanent reduction in the quality of the file.
The trade-off for a smaller file size in lossy compression is that some of the original data is permanently discarded.
5026
In Boolean algebra, what is the simplified form of the expression A + A'?
Answer:
1
This expression represents the OR operation between a Boolean variable 'A' and its complement 'A''. According to the Complement Law of Boolean algebra, an OR operation between a variable and its complement always results in '1'. This is because if A is 0, then A' is 1, so 0 + 1 = 1. Conversely, if A is 1, then A' is 0, so 1 + 0 = 1. In both possible cases, the result is 1.
5027
Which logic gate produces a high output (1) if any of its inputs are high (1)?
Answer:
OR
The OR gate functions like a logical "or" condition. The output is true (1) if input A OR input B (or both) are true (1).
5028
If a text file is saved using ASCII encoding, what will happen to a character like the Chinese symbol '你好'?
Answer:
It will be lost or converted to a generic placeholder like '?'
ASCII has no representation for this character. When forced to save, the information is typically lost, and the character is replaced by a question mark, a square box, or some other error symbol.
5029
What is the decimal equivalent of (10)₁₆?
Answer:
16
(1 \* 16¹) + (0 \* 16⁰) = 16 + 0 = 16.
5030
1 GB is equal to how many MB?
Answer:
1024 MB
In computer memory and data storage, units are based on powers of 2. The prefix "Giga" represents 2^30, while "Mega" represents 2^20. [cite: 432] Therefore, one Gigabyte (GB) is equal to 1024 Megabytes (MB).