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
5171
What is the hexadecimal equivalent of the binary number (10100110)₂?
Answer:
(A6)₁₆
To convert from binary to hexadecimal, group the binary digits into sets of four from right to left. (1010 0110). Convert each group to its hexadecimal equivalent: 1010 = A, 0110 = 6. So, the hexadecimal number is (A6)₁₆.
5172
[cite_start]Which type of data consists of words, sentences, and paragraphs? [cite: 463]
Answer:
Text
Text data is a sequence of characters, such as letters, numbers, and symbols, that are organized into words, sentences, and paragraphs. [cite: 464] [cite_start]It is one of the most common forms of information processed by computers. [cite: 465]
5173
An 8-bit character encoding scheme, such as extended ASCII, can represent a finite number of unique symbols or characters. What is the total count of distinct symbols that can be encoded using an 8-bit system?
Answer:
256
An 8-bit system means that each character or symbol is represented by 8 binary digits (bits). Each bit can be either a 0 or a 1. To find the total number of unique combinations possible with 'n' bits, you calculate 2 to the power of 'n' (2^n). In this case, for an 8-bit system, the calculation is 2^8. This results in 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 = 256. Therefore, an 8-bit encoding scheme can represent 256 unique symbols. Standard ASCII typically uses 7 bits (128 characters), but extended ASCII uses 8 bits for a wider range of characters, including special symbols and international characters.
5174
A "Byte Order Mark" (BOM) is sometimes found at the beginning of a text file to indicate:
Answer:
The encoding (e.g., UTF-8, UTF-16) and endianness of the text
The BOM is a special Unicode character (U+FEFF) whose byte representation looks different depending on the encoding, allowing a program to correctly guess how the file should be read.
5175
The hexadecimal digit 'F' is equivalent to which binary value?
Answer:
1111
'F' in hexadecimal represents the decimal value 15. The binary representation of 15 is 1111 (8 + 4 + 2 + 1).
5176
When you "delete" a file in a graphical user interface, where does it typically go first?
Answer:
It is moved to the Recycle Bin or Trash.
This is a safety feature that allows users to recover accidentally deleted files.
5177
Which of these is a rule of binary addition?
Answer:
1 + 1 + 1 = 11
1 + 1 + 1 equals 3 in decimal, which is (11)₂ in binary. This means the result is 1 with a carry of 1.
5178
How many different values can be represented with 4 bits?
Answer:
16
With 'n' bits, you can represent 2^n different values. Therefore, with 4 bits, you can represent 2^4 = 16 different values (from 0000 to 1111).
5179
Which of these is considered a universal logic gate?
Answer:
NOR Gate
A NOR gate is universal because it can be combined to implement any other logic gate.
5180
A Unified Threat Management (UTM) appliance is a security product that typically combines:
Answer:
Multiple security features into a single device, such as a firewall, IDS/IPS, antivirus, and VPN.
A UTM device is an all-in-one security solution, often targeted at small-to-medium businesses. It simplifies security management by consolidating many different security functions into one piece of hardware.