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
5161
## 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
5162
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.
5163
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.
5164
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.
5165
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.
5166
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.
5167
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.
5168
What is the result of the binary subtraction (100)₂ - (001)₂?
Answer:
(011)₂
Right column: 0-1 requires a borrow. Borrow from the leftmost '1', which makes the middle column a '2', then borrow from it, making it a '1' and the rightmost column a '2'. So, 2-1=1. Middle column is now 1-0=1. Left column is now 0-0=0. Result is 011. (In decimal: 4 - 1 = 3).
5169
## What is (1101)₂ multiplied by (101)₂? A) (1000001)₂ B) (111001)₂ C) (101101)₂ D) (1101101)₂ Correct Answer: A) (1000001)₂ Explanation:
Answer:
(1000001)₂ B) (111001)₂ C) (101101)₂ D) (1101101)₂ Correct Answer: A) (1000001)₂ Explanation:
1101
5170
Performing a "cut" and then "paste" on a file is equivalent to which single operation?
Answer:
Move
"Cut" marks a file for moving, and "paste" completes the action of relocating it.