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
1
A sine wave is:
Answer:
Periodic and continuous
A sine wave is a smooth, continuous waveform that repeats at regular intervals, making it periodic.
2
An example of a moderate-speed switched communications service is:
Answer:
Data phone 50
Dataphone 50 represents medium-speed switched data services.
3
If a signal’s bandwidth is 5 KHz and the lowest frequency is 52 KHz, what is the highest frequency?
Answer:
57 KHz
The highest frequency is the sum of the lowest frequency and the bandwidth (52 KHz + 5 KHz = 57 KHz).
4
Which translates domain names into IP addresses?
Answer:
DNS Schemes
DNS, which stands for Domain Name System, is the internet's system for converting human-readable domain names (like [www.google.com](https://www.google.com)) into the numerical IP addresses (like 172.217.16.142) that computers use to identify each other.
5
What does MAC stand for in networking?
Answer:
Media Access Control
A MAC address is a unique identifier assigned to network interfaces for communication.
6
Before data is transmitted, it must be transformed into what?
Answer:
Electromagnetic signals
Data must be converted into electromagnetic signals (like radio waves, electrical signals, or light pulses) to be transmitted over a physical medium.
7
What does IP stand for in networking?
Answer:
Internet Protocol
IP governs the format of data sent over the internet and assigns unique addresses to devices.
8
Which component is essential for channel separation in FDM?
Answer:
Bandpass filters
Bandpass filters are required to separate channels in Frequency Division Multiplexing.
9
If wave A’s frequency is double that of wave B, B’s period is:
Answer:
Twice A’s
Period is the inverse of frequency (T=1/f). If A's frequency is 2f, its period is 1/(2f). If B's frequency is f, its period is 1/f, which is twice A's period.
10
A numerical identification and logical address assigned to network devices is called what?
Answer:
Internet Protocol address
An Internet Protocol (IP) address is a unique numerical label used to identify a device on a network.