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
5061
Convert the binary number (10000)₂ to decimal.
Answer:
16
This number has a '1' in the 2⁴ position and zeros elsewhere. 1 \* 2⁴ = 16.
5062
In Boolean algebra, what does the expression A + B represent?
Answer:
A OR B
The plus symbol (+) is the standard notation for the logical OR operation in Boolean algebra.
5063
Which of the following characters is typically invalid in a file name on a Windows operating system?
Answer:
?
The question mark (?) is a wildcard character in Windows and is not allowed in file names. The hyphen, period, and underscore are all valid characters.
5064
Convert the decimal number 58 into octal.
Answer:
(72)₈
58 / 8 = 7 with a remainder of 2. The result is 7. Reading from bottom to top gives (72)₈.
5065
Which of the following accurately represents the full meaning of the acronym ASCII?
Answer:
American Standard Code for Information Interchange
ASCII stands for 'American Standard Code for Information Interchange'. It is a character encoding standard that was developed in the 1960s. It assigns unique numerical values to various characters, including letters, numbers, punctuation marks, and control characters. This standardization allows different computer systems to represent and exchange text data consistently, ensuring that a character typed on one computer appears the same on another.
5066
In ASCII, what does the decimal value 65 represent?
Answer:
The uppercase letter 'A'
In the ASCII standard, the uppercase letters A through Z are represented by the decimal values 65 through 90.
5067
Which logic gate produces a high output (1) only when all of its inputs are high (1)?
Answer:
AND
The AND gate functions like a logical "and" condition. The output is true (1) if and only if input A AND input B are both true (1).
5068
The ".pdf" extension stands for:
Answer:
Portable Document Format
PDF (Portable Document Format) is a file format designed to present documents consistently across multiple platforms and applications.
5069
How do you convert the octal number (74)₈ to binary?
Answer:
(111100)₂
Convert each octal digit into its 3-bit binary equivalent. 7 = 111, 4 = 100. Combine them to get (111100)₂.
5070
Which of the following best describes the primary function of ASCII (American Standard Code for Information Interchange)?
Answer:
A character encoding standard that assigns binary values to alphanumeric characters and symbols.
ASCII (American Standard Code for Information Interchange) is a character encoding standard. Its primary function is to assign unique numerical values (binary codes) to characters, such as uppercase and lowercase English letters, numbers (0-9), punctuation marks, and control characters. This standardization allows computers and other devices to uniformly represent and exchange text data. Standard ASCII uses 7 bits, allowing it to represent 128 different characters (2^7). Extended ASCII uses 8 bits, expanding the character set to 256 characters (2^8) to include additional symbols and characters from various languages.