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
191
Which device connects a local network to the internet?
Answer:
Modem
A modem modulates signals to transmit data between your network and the internet.
192
Which device does NOT let multiple devices use a single communication line?
Answer:
Doubleplexer
Unlike multiplexers and concentrators, a doubleplexer does not facilitate line sharing among several devices.
193
Which among the following is not a transmission medium?
Answer:
Modem
A modem is a device, not a medium;
194
Which type of modem does not require any cable as a transmission channel to transmit signals?
Answer:
Wireless modem
A wireless modem, such as a cellular modem or a Wi-Fi modem/router, transmits and receives data using radio waves rather than a physical cable. This allows for connectivity without being physically tethered to a phone line or cable network.
195
In fiber-optic cables, how does the light signal travel along the core?
Answer:
Reflection
The light signal travels through the core by continuously bouncing off the cladding in a process called total internal reflection.
196
What affects the quality of satellite transmission?
Answer:
Bad weather
Satellite signals must travel through the Earth's atmosphere to reach their destination. Bad weather conditions, particularly heavy rain or snow (a phenomenon known as "rain fade"), can absorb and scatter the microwave signals, leading to a weakened or lost connection.
197
Which one is not unguided media?
Answer:
Fiber optic cable
Unguided media refers to wireless transmission. Satellite, microwave, and mobile communication all transmit signals through the air. Fiber optic cable is a physical, wired medium (guided media) that transmits data using light pulses.
198
A device that merges signals from many I/O devices onto one line is a:
Answer:
Multiplexer
Multiplexers aggregate multiple input streams for transmission over a single line.
199
In a synchronous modem, to which unit does the digital-to-analog converter pass the signal?
Answer:
Modulator
The converter sends the analog output to the modulator for transmission.
200
Which device links various inputs to various outputs?
Answer:
Crossbar
A crossbar switch connects multiple inputs to outputs for data exchange in a network.