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
Synchronous modems are pricier than asynchronous modems because:
Answer:
They house clock recovery circuits
Clock recovery increases the cost and complexity of synchronous modems.
12
In the data communication model, the channel can include:
Answer:
All of the above
Communication channels are any medium enabling data transfer, including mail, lines, or radio.
13
Which device is used to connect multiple computers in a network?
Answer:
Switch
A switch connects multiple devices in a network and manages data traffic efficiently.
14
How many types are communication channels divided into?
Answer:
2
Communication channels, or transmission media, are broadly divided into two main categories: Guided Media (also called Bounded or Wired), which includes physical cables like twisted pair, coaxial, and fiber optic, and Unguided Media (also called Unbounded or Wireless), which involves transmission through the air like radio waves or microwaves.
15
In which topology are all network elements attached to one cable?
Answer:
Bus
The bus topology connects all devices along a single communication line.
16
which layer of OSI model used by router?
Answer:
layer 3
Routers operate at the Network Layer (Layer 3) of the OSI model. Their primary function is to route packets between different networks by using logical addresses, such as IP addresses, to determine the best path for data to travel.
17
Which Network topology needs HUB for its working?
Answer:
Star
In a star topology, all network devices are individually connected to a central connection point, such as a hub or a switch. All traffic passes through this central device, which acts as a repeater for the data flow.
18
About how much power can a light-emitting diode send into an optical fiber?
Answer:
100 microwatts
Typical LEDs couple close to 100 microwatts into fibers.
19
Which cables have a glass or plastic core, cladding, and an outer jacket?
Answer:
Fiber-optic
Fiber-optic cables are composed of a central core for light transmission, cladding to reflect the light, and a protective outer jacket.
20
What is the full form of UTP in computer networking context?
Answer:
Unshielded Twisted Pair
UTP stands for Unshielded Twisted Pair. It is the most common type of copper cable used in telephone wiring and local area networks (LANs). It consists of pairs of wires twisted together to help cancel out electromagnetic interference.