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
191
Which number system is often used in computing as a more human-readable representation of binary data?
Answer:
Hexadecimal
Hexadecimal is convenient because it is very compact. One hexadecimal digit can represent four binary digits (a nibble), making it much easier to read and write long binary strings.
192
The decimal number 0.5 is represented in binary as:
Answer:
(0.1)₂
The first position after the binary point represents 2⁻¹, which is 1/2 or 0.5.
193
The Boolean expression A(B + C) = AB + AC represents which law?
Answer:
= AB + AC represents which law?
This law shows how to distribute an AND operation across an OR operation, which is analogous to the distributive property in standard algebra.
194
In a multi-user system, who usually has the ability to change the permissions of a file?
Answer:
The owner of the file and the system administrator.
The owner of a file is granted special privileges over it, including the ability to set permissions for other users.
195
The character set that includes scripts like Cyrillic, Greek, Arabic, and Hebrew is:
Answer:
Unicode
Unicode is the only standard designed to encompass all of these writing systems and many more.
196
How do you find the two's complement of a binary number?
Answer:
Invert all the bits (change 0s to 1s and 1s to 0s) and then add 1
This two-step process (inverting the bits is finding the one's complement) correctly generates the negative representation of a binary number in the two's complement system.
197
Which of the following accurately represents the full name associated with 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 for electronic communication. ASCII codes represent text in computers, telecommunications equipment, and other devices. Most modern character-encoding schemes, like Unicode, have their historical roots in ASCII.
198
[cite_start]Which of the following has a 4-bit coding scheme? [cite: 478]
Answer:
BCD
BCD (Binary-Coded Decimal) is a system that represents each decimal digit (0-9) with a four-bit binary number. [cite: 479] [cite_start]It is not used for encoding text characters like the other options but is used in some digital systems for numerical calculations. [cite: 480]
199
What is the primary benefit of file compression?
Answer:
To reduce the file size.
Compression algorithms work by reducing redundancy in the data, which makes the file smaller.
200
To match all of the words in your search, you should use the Boolean __ operator.
Answer:
And
The "And" operator ensures that all words in a search query are present in the results.