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
5011
A buffer is a logic gate that:
Answer:
Outputs the same value as the input
A buffer does not perform a logical operation. Its output is simply equal to its input (A -\> A). It is used to amplify a signal or provide electrical isolation.
5012
In an 8-bit two's complement system, what indicates a negative number?
Answer:
is 1
The leftmost bit, or MSB, is used as the sign bit. If it is 0, the number is positive or zero. If it is 1, the number is negative.
5013
The logic gates that form the basis of computer hardware are built using:
Answer:
Transistors
Transistors act as tiny, fast electronic switches. By combining them in specific ways, all the fundamental logic gates (AND, OR, NOT) can be constructed.
5014
Which of the following accurately represents the full meaning of the acronym ASCII, frequently encountered in computer science and data communication?
Answer:
American Standard Code for Information Interchange
ASCII stands for 'American Standard Code for Information Interchange'. It is a character encoding standard that assigns unique numerical values (usually 0-127) to characters, including letters (uppercase and lowercase), digits, punctuation marks, and control characters. This allows computers and other electronic devices to represent and exchange text-based information consistently. It was one of the earliest and most widely adopted character encoding schemes, foundational for the development of modern computing and data communication.
5015
The Boolean expression A + AB simplifies to:
Answer:
A
This is the Absorption Law. It can be proven by factoring: A + AB = A(1 + B). Since 1 + B = 1, the expression becomes A(1), which is A.
5016
In the Windows file path `C:\Program Files\Microsoft Office\`, which part represents a subfolder?
Answer:
Both b and c
`Program Files` is a subfolder of the root directory `C:\`, and `Microsoft Office` is a subfolder of `Program Files`.
5017
Is Unicode an encoding?
Answer:
No, it is a character set; UTF-8 and UTF-16 are encodings
This is a common point of confusion. The Unicode Standard itself defines the character set (the list of characters and their code points). Encodings like UTF-8, UTF-16, and UTF-32 are the methods used to store those code points in binary.
5018
Which law in Boolean algebra states that A + B = B + A?
Answer:
Commutative Law
The commutative law states that the order of the operands in an OR or AND operation does not affect the result, just like in regular arithmetic (e.g., 3 + 4 = 4 + 3).
5019
Which numerical system utilizes a set of eight unique symbols to express all possible quantities?
Answer:
Octal
The octal number system is a base-8 system, which means it employs eight distinct symbols to represent numerical values. These symbols are typically the digits 0, 1, 2, 3, 4, 5, 6, and 7. In contrast:
* **Binary** (base-2) uses two symbols (0 and 1).
* **Decimal** (base-10) uses ten symbols (0-9).
* **Hexadecimal** (base-16) uses sixteen symbols (0-9 and A-F).
5020
The circuits in a computer's processor that perform arithmetic operations are called:
Answer:
ALUs (Arithmetic Logic Units)
The ALU is the specific component within the CPU that is responsible for carrying out all arithmetic calculations (like addition, subtraction) and logical operations.