Computer Science - IT MCQs
Topic Notes: Computer Science - IT
<p>MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.</p>
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
1871
What does ALU stand for?
Answer:
Arithmetic Logic Unit
The ALU (Arithmetic Logic Unit) performs mathematical and logical operations in the CPU[6](https://www.linkedin.com/pulse/understanding-central-processing-unit-cpu-brain-your-computer-ayaz-lzlqf).
1872
Which of these is a secondary memory device?
Answer:
Floppy disk
A floppy disk is a secondary memory device used for data storage.
1873
Which medium is commonly used to back up information from a hard disk?
Answer:
All of the above
Various media like magnetic tape, CDs, or floppy disks can be used for backups.
1874
Which of these is an advantage of CD-ROMs as storage media?
Answer:
All of the above
CD-ROMs are cost-effective, have high reliability, and can access data faster than magnetic disks.
1875
What happens when a disk is formatted?
Answer:
Data is deleted from the disk
Formatting erases existing data on the disk preparing it for new data storage.
1876
What does modem stand for?
Answer:
Modulator demodulator
A modem modulates and demodulates signals for communication over telephone lines or other media.
1877
ASCII code is a ______ bit code.
Answer:
7
ASCII uses 7 bits to represent each character.
1878
The hexadecimal number system has how many symbols?
Answer:
16
Hexadecimal uses 16 symbols: 0-9 and A-F.
1879
What is responsible for holding data and instructions temporarily?
Answer:
RAM
RAM (Random Access Memory) is a type of computer memory that can be read and changed in any order, typically used to store working data and machine code. It is a form of volatile memory, meaning it holds data temporarily while the computer is on, and the data is lost when the power is turned off.
1880
What does the 'S' stand for in USB?
Answer:
Serial
USB stands for Universal Serial Bus, where “Serial” indicates data transmission one bit at a time.