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
31
Where is the scrambler located in a synchronous modem?
Answer:
Transmission section
The transmission section scrambles outgoing data to prevent patterns that can cause transmission issues.
32
Which communication medium requires "line-of-sight"?
Answer:
Microwave
Microwave transmission uses high-frequency radio waves that travel in straight lines and do not easily pass through solid objects. For this reason, the transmitting and receiving antennas must be in a direct, unobstructed "line-of-sight" with each other.
33
Which is an example of unbounded media?
Answer:
Microwave
Unbounded media, also known as unguided or wireless media, does not use physical cables to transmit signals. Microwave transmission sends signals through the open air, making it a prime example of unbounded media, along with radio waves and satellite communication.
34
Which device functions within the data link layer of a network?
Answer:
Bridge
A network bridge operates at the Data Link Layer (Layer 2) of the OSI model. It connects two or more network segments and uses MAC addresses to forward data frames only to the segment where the destination device is located.
35
Which cabling is most widely used for modern data transfer?
Answer:
Cat 5
Category 5 (Cat 5) cable is a common type of twisted-pair cable used for Ethernet networks.
36
Which type of modem can be added to the system unit through an expansion slot?
Answer:
Internal modem
An internal modem is a circuit board (an expansion card) that is designed to be plugged directly into an expansion slot (like PCI or PCIe) on a computer's motherboard, residing entirely inside the computer's case.
37
Satellites are approximately how many miles above the Earth?
Answer:
22300 miles
Geostationary communication satellites orbit the Earth at a very specific altitude of approximately 22,300 miles (about 35,800 kilometers) above the equator. At this height, their orbital period matches the Earth's rotation, so they appear to remain stationary in the sky from the ground.
38
Wired home networks typically use Cat-5 or Cat-6 Ethernet cables or a home’s \_\_ to connect devices.
Answer:
Electrical wiring
Power-line communication (PLC) is a technology that allows data to be sent over existing electrical wiring.
39
Which cable carries signals as pulses of light through glass?
Answer:
Fiber optics
Fiber optic cables transmit data using light pulses, which allows for very high bandwidth and long-distance communication.
40
What is the minimum number of wires necessary for serial data transfer?
Answer:
2
At least two wires are required;