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
161
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.
162
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.
163
Which network topology connects each device with dedicated links to all others?
Answer:
Mesh
Mesh topology enables full connectivity between all devices using individual links.
164
What device performs both signal modulation and demodulation?
Answer:
Modem
Modems convert digital data to analog signals and vice versa for communication.
165
Which communication medium is most commonly used for data transfer today?
Answer:
Cat 5
Cat 5 and its variants (like Cat 5e and Cat 6) are the most common cables used for wired Ethernet local area networks.
166
Avalanche photodiodes can detect transmitted data bits by receiving:
Answer:
100 photons
These sensitive photodiodes can detect extremely low light, such as 100 photons per bit.
167
Which cables carry data as light signals?
Answer:
Fiber-optic
Fiber-optic cables use pulses of light to transmit information, allowing for high speeds and long distances.
168
The most widely used cabling for data transfer today is:
Answer:
Cat 5
Category 5 (Cat 5 and its enhanced version Cat 5e) is a widely deployed Ethernet cable for computer networks.
169
What device forwards data packets between different networks?
Answer:
Router
Routers manage traffic by determining the best paths for forwarding data packets between networks.
170
In which topology are all devices connected through one central hub?
Answer:
Star
Star topology links all nodes to a central hub, simplifying management and troubleshooting.