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
5121
What is (0011)₂ + (0110)₂?
Answer:
(1001)₂
(In decimal: 3 + 6 = 9).
5122
What is the main advantage of using a hierarchical directory structure?
Answer:
It provides a logical and organized way to manage files and folders.
A hierarchical structure allows users to group related files together, making it easier to locate and manage them.
5123
What is (10)₂ x (01)₂?
Answer:
(10)₂
In decimal, this is 2 \* 1 = 2. The binary for 2 is (10)₂.
5124
Convert (11)₁₀ to binary.
Answer:
(1011)₂
11 = 8 + 2 + 1 = (1 \* 2³) + (0 \* 2²) + (1 \* 2¹) + (1 \* 2⁰), which is 1011.
5125
What is the binary equivalent of the hexadecimal number (F3)₁₆?
Answer:
(11110011)₂
Convert each hexadecimal digit into its 4-bit binary equivalent. F = 1111, 3 = 0011. Combine them to get (11110011)₂.
5126
The hexadecimal number system uses how many unique symbols or digits?
Answer:
16
Hexadecimal is a base-16 system. It uses the ten digits from the decimal system (0-9) plus the first six letters of the alphabet (A, B, C, D, E, F) to represent the values 10 through 15.
5127
If you "rename" the file `report.txt` to `final_report.txt`, what happens to the file's contents?
Answer:
The contents remain unchanged.
Renaming a file only changes its name; the data within the file is not affected.
5128
"Lossless" compression means that:
Answer:
No data is lost, and the original file can be perfectly recreated.
Lossless compression is crucial for file types where every bit of data is important, such as text documents and programs.
5129
What is the hexadecimal equivalent of the decimal number 42?
Answer:
(2A)₁₆
Divide 42 by 16. 42 / 16 = 2 with a remainder of 10. The remainder 10 is 'A' in hexadecimal. The result is 2. Reading from bottom to top gives (2A)₁₆.
5130
What is the decimal equivalent of (FACE)₁₆?
Answer:
64206
(F \* 16³) + (A \* 16²) + (C \* 16¹) + (E \* 16⁰) = (15 \* 4096) + (10 \* 256) + (12 \* 16) + (14 \* 1) = 61440 + 2560 + 192 + 14 = 64206.