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
3601
In Boolean algebra, what is the simplified output of the expression 'A OR 1'?
Answer:
1 (Logical one)
This expression demonstrates the Annulment Law (also known as the Dominance Law or OR Identity) in Boolean algebra. The OR operation returns 'true' (or 1) if at least one of its inputs is true. In the expression 'A + 1' (where '+' represents the OR operation), one of the inputs is always '1'. Therefore, regardless of whether A is '0' or '1', the result of the OR operation will always be '1'. Let's consider both possibilities for A: If A = 0, then 0 + 1 = 1. If A = 1, then 1 + 1 = 1. In both cases, the output is 1.
3602
In Boolean algebra, what is the outcome when any Boolean variable 'A' is subjected to a logical AND operation with the Boolean constant '1'?
Answer:
A
This operation demonstrates the Identity Law for the Logical AND operator in Boolean algebra. When a Boolean variable 'A' (which can be either 0 or 1) is ANDed with '1', the result is always 'A' itself. Let's examine the two possible cases for 'A': 1. If A = 0: Then A · 1 = 0 · 1 = 0. In this case, the result (0) is equal to A. 2. If A = 1: Then A · 1 = 1 · 1 = 1. In this case, the result (1) is also equal to A. In both scenarios, the output of the operation A · 1 is identical to the value of A. Therefore, '1' acts as the identity element for the logical AND operation, meaning it does not alter the value of the variable it operates on.
3603
The number (11)₈ is what in decimal?
Answer:
9
(1 \* 8¹) + (1 \* 8⁰) = 8 + 1 = 9.
3604
Which coding system can represent up to 65,536 symbols?
Answer:
Unicode
The original 16-bit version of Unicode was designed to represent 2^16, or 65,536, unique characters. This allows it to encompass characters from most of the world's writing systems in a single character set, far exceeding the capacity of 7-bit ASCII (128) or 8-bit EBCDIC (256).
3605
What does Wi-Fi stand for?
Answer:
None of the above
Wi-Fi is a trademarked name for the IEEE 802.11 set of wireless networking standards. It does not stand for anything.
3606
What are some common types of online scams?
Answer:
All of the above
It is important to be able to recognize the signs of a scam.
3607
What is the "Cache API"?
Answer:
An API for storing and retrieving network requests and their corresponding responses
The Cache API is a key part of the service worker specification, which allows for the creation of offline-first web applications.
3608
Which network type is better for a business that handles sensitive data?
Answer:
Wired network
For handling sensitive data, the enhanced security of a wired network is highly recommended.
3609
What is an SSID?
Answer:
The name of a wireless network
The Service Set Identifier (SSID) is the public name of a Wi-Fi network.
3610
Which device operates at the Physical layer (Layer 1) of the OSI model?
Answer:
Hub
A hub is a simple device that operates at the Physical layer, simply repeating all incoming signals to all connected ports.