Computer Science - IT MCQs
Topic Notes: Computer Science - IT
<p>MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.</p>
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
591
What is a "code point" in the context of Unicode?
Answer:
A unique number assigned to a single character or symbol in the Unicode standard
Every character in the Unicode standard is assigned a unique numerical value, called a code point, written in the format U+XXXX (where XXXX is a hexadecimal number).
592
In Boolean algebra, what is the outcome when any variable 'A' is subjected to a logical AND operation with the constant '1'?
Answer:
A
This question tests understanding of fundamental Boolean algebra identities, specifically the Identity Law for the AND operation. When a Boolean variable 'A' (which can be either 0 or 1) is ANDed with '1', the result always mirrors the value of 'A'.
Let's examine the two possible cases for 'A':
1. If A = 0: Then A ⋅ 1 = 0 ⋅ 1 = 0. In this case, the result is A.
2. If A = 1: Then A ⋅ 1 = 1 ⋅ 1 = 1. In this case, the result is A.
In both scenarios, the output of the operation 'A ⋅ 1' is equivalent to 'A' itself. Therefore, 'A' is the correct answer. This law is crucial for simplifying Boolean expressions and understanding digital logic circuits.
593
Why is it a security risk to grant "write" permission to all users for a system folder?
Answer:
Any user could potentially delete or modify critical system files, causing instability or a crash.
System files should be protected with restrictive permissions to maintain the integrity of the operating system.
594
## Calculate the product of (101)₂ and (11)₂. A) (1011)₂ B) (1101)₂ C) (1111)₂ D) (1001)₂ Correct Answer: C) (1111)₂ Explanation:
Answer:
(1111)₂ D) (1001)₂ Correct Answer: C) (1111)₂ Explanation:
101
595
Which of these file types is most likely to use "lossy" compression?
Answer:
A streaming video file (.mp4)
Lossy compression achieves higher compression ratios by discarding data that is less perceptible to human senses, which is suitable for media like audio and video.
596
What is an "archive" in the context of file compression?
Answer:
A single file that contains a collection of other files and folders.
An archive is a container that bundles multiple files into one for easier storage and transfer.
597
What is the difference between "copy" and "move"?
Answer:
"Copy" creates a duplicate in a new location, while "move" relocates the original.
A copy operation results in two identical files in different locations. A move operation results in the original file being in a new location.
598
If a number system has a base of 'R', the digits used are in the range:
Answer:
0 to R-1
A number system with a base R will have R unique digits, starting from 0 up to the digit representing the value R-1. For example, base-10 has digits 0 to 9.
599
Which file extension is commonly associated with a compressed archive?
Answer:
.zip
The .zip format is one of the most widely used for creating compressed archives that can contain multiple files.
600
The Euro currency symbol (€) can be represented by Unicode, but not by standard 7-bit ASCII. Why?
Answer:
All of the above
The Euro symbol was introduced long after the 7-bit ASCII standard was finalized, and there was no available space within its 128 slots to add it. This is a classic example of why Unicode is necessary.