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
151
To increase network length and preserve signal quality, you should use a:
Answer:
Repeater
A repeater regenerates signals, allowing the network to cover longer distances without degradation.
152
What method is commonly used to establish a connection with a remote computer over a phone line?
Answer:
Dialup
Dial-up is a form of Internet access that uses the facilities of the public switched telephone network (PSTN) to establish a connection to an Internet service provider (ISP) by dialing a telephone number on a conventional telephone line. This process requires a modem.
153
Synchronous modems are pricier than asynchronous modems because:
Answer:
They house clock recovery circuits
Clock recovery increases the cost and complexity of synchronous modems.
154
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.
155
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.
156
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.
157
In which topology are all network elements attached to one cable?
Answer:
Bus
The bus topology connects all devices along a single communication line.
158
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.
159
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.
160
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.