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
11
Which of the following is an example of digital, rather than analog, communication?
Answer:
DDD
DDD refers to a digital direct distance dialing system.
12
Multiplexing requires how many paths and channels?
Answer:
Multiple paths, one channel
Multiplexing allows multiple signals to share a single channel, utilizing various paths.
13
A(n) \_\_ signal is a composite analog signal with infinite bandwidth.
Answer:
Digital
A perfect digital signal, represented as a square wave, is theoretically composed of an infinite number of sine waves, giving it infinite bandwidth.
14
In TCP/IP, a port address is how many bits long?
Answer:
16
TCP/IP uses 16-bit port numbers to identify specific applications or processes running on a host.
15
Which channel type transmits data at a relatively slow pace?
Answer:
Narrow band channel
Narrow band channels support low-speed data communications.
16
For which type of channel is Shannon capacity used to find maximum bit rate?
Answer:
Noisy
The Shannon-Hartley theorem calculates the theoretical maximum data rate (channel capacity) for a communication channel with a specific noise level.
17
When multiple devices use the same transmission medium and channel, it is called:
Answer:
Multiplexing
Multiplexing enables several signals to share a single channel efficiently.
18
In a time-domain plot, the horizontal axis represents what?
Answer:
Time
A time-domain plot shows how a signal's amplitude changes over time, with time on the horizontal axis.
19
In a frequency-domain plot, the horizontal axis represents what?
Answer:
Frequency
A frequency-domain plot shows the amplitude or phase of a signal's constituent frequencies, with frequency on the horizontal axis.
20
Which of the following contains a permanent IP address?
Answer:
Server
A web server, which hosts websites and services, must be consistently reachable on the internet. For this reason, servers are typically assigned a permanent, static IP address that does not change. Client computers, in contrast, are usually assigned a temporary, dynamic IP address.