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
171
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.
172
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.
173
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.
174
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.
175
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.
176
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.
177
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.
178
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.
179
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.
180
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.