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
21
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.
22
What device performs both signal modulation and demodulation?
Answer:
Modem
Modems convert digital data to analog signals and vice versa for communication.
23
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.
24
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.
25
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.
26
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.
27
What device forwards data packets between different networks?
Answer:
Router
Routers manage traffic by determining the best paths for forwarding data packets between networks.
28
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.
29
As light travels down an optical fiber, the reduction in signal strength is called:
Answer:
Attenuation
Attenuation refers to the loss of signal intensity as it moves through a medium like fiber optics.
30
Which cable is commonly used in LAN?
Answer:
Coaxial cable
Coaxial cable, along with twisted-pair cable (like Ethernet), has been a very common choice for wiring Local Area Networks (LANs). It provides good bandwidth and is relatively resistant to interference, making it suitable for connecting computers in an office or building.