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
4991
The term LSB stands for:
Answer:
Least Significant Bit
The Least Significant Bit (LSB) is the bit in a binary number that has the lowest value (the rightmost bit in a standard representation).
4992
How many unique characters can be represented by Extended ASCII?
Answer:
256
Extended ASCII is an 8-bit character set. Using 8 bits allows for 2⁸ = 256 different characters to be represented. The first 128 characters are the same as standard ASCII.
4993
The octal number system has a base of:
Answer:
8
The octal system is base-8, which means it uses eight unique digits: 0, 1, 2, 3, 4, 5, 6, and 7.
4994
What does the "read" operation allow you to do with a file?
Answer:
View its contents.
The read operation involves accessing the data within a file to display it or load it into memory.
4995
When transmitting odd-parity coded symbols, the number of zeros is:
Answer:
Unknown
Parity checks pertain to ones, so the zero count isn't fixed or predictable.
4996
In a hierarchical file system, what is the top-most directory called?
Answer:
The root directory
The root directory is the starting point for the entire directory structure. All other directories and files are contained within it.
4997
Which set of Boolean operators is commonly employed to refine search queries on the internet?
Answer:
AND, OR, NOT
Boolean operators are fundamental tools for crafting precise search queries. The most commonly used and widely supported operators in internet search engines are AND, OR, and NOT.
* **AND**: Narrows a search by requiring all specified terms to be present in the search results. For example, 'cats AND dogs' would return pages containing both words.
* **OR**: Broadens a search by finding results that contain at least one of the specified terms. For example, 'cats OR felines' would return pages with either 'cats' or 'felines' (or both).
* **NOT**: Excludes specific terms from the search results. Often represented as a minus sign (-) in many search engines. For example, 'apple NOT fruit' would search for the company 'Apple' but exclude results related to the fruit.
While operators like NAND, NOR, XOR, or conditional statements (IF, THEN, ELSE) are used in computer logic and programming, they are not standard Boolean operators for general internet search queries. Similarly, comparison operators (GREATER THAN, LESS THAN, EQUALS) are used for numerical or data comparison, not for combining keywords in text-based searches.
4998
What is the Boolean expression for a NOT gate with input A?
Answer:
A' or Ā
The prime symbol (') or an overbar (Ā) are the standard notations for the logical NOT (inversion) operation.
4999
How many bits does the original standard ASCII use to represent each character?
Answer:
7 bits
The original ASCII standard is a 7-bit code, which allows it to represent 2⁷ = 128 unique characters.
5000
The "save" operation in an application is an example of which fundamental file operation?
Answer:
Write
When you save a file, you are writing data (either new or modified) from the application's memory to the storage device.