1. An analog signal is:
- not affected by noise
- always a square wave
- made of only 0s and 1s
- continuous and varies smoothly
Answer: D) continuous and varies smoothly
Explanation: Analog signals are continuous waves.
MCQs / Computer Science / Data Communication and Transmission Media
Data Communication and Transmission Media MCQs — Computer Science
45 multiple-choice questions on Data Communication and Transmission Media from Computer Science, each with the correct answer and, where available, a teacher's explanation. Read through them to revise the chapter, then practise the same questions one by one to test yourself.
2. Guided media are also called:
- wireless media
- satellite media
- unbounded media
- wired or bounded media
Answer: D) wired or bounded media
Explanation: Signals travel along a physical cable.
3. The main disadvantage of fibre-optic cable is:
- high cost and difficult installation
- very low speed
- high interference
- short distance only
Answer: A) high cost and difficult installation
Explanation: It is expensive and fragile to splice.
4. Data typed on a keyboard is usually transmitted:
- in parallel over fibre
- by satellite
- asynchronously
- synchronously
Answer: C) asynchronously
Explanation: Keystrokes occur at irregular intervals.
5. TV remote controls use:
- infrared
- fibre optics
- coaxial cable
- microwaves
Answer: A) infrared
Explanation: Infrared is short-range and line-of-sight.
6. The device that sends the message is the:
- medium
- protocol
- receiver
- sender (source)
Answer: D) sender (source)
Explanation: The source originates the message.
7. Demodulation means converting:
- digital to analog
- light into heat
- data into printouts
- analog signals back to digital
Answer: D) analog signals back to digital
Explanation: At the receiver, the modem demodulates the signal.
8. Which guided medium is cheapest and most commonly used in LANs?
- Satellite
- Fibre optic
- Twisted pair
- Microwave
Answer: C) Twisted pair
Explanation: UTP Cat5e/Cat6 is common in offices.
9. Undersea Internet cables connecting continents are:
- coaxial TV cables
- twisted pair telephone wires
- infrared links
- fibre-optic cables
Answer: D) fibre-optic cables
Explanation: Fibre carries huge data over long distances.
10. A cable with a central copper conductor surrounded by insulation and a metal braided shield is:
- infrared link
- fibre-optic cable
- twisted pair
- coaxial cable
Answer: D) coaxial cable
Explanation: That is the structure of coax.
11. Unguided media transmit signals through:
- air or space without a physical conductor
- coaxial shields
- copper wires
- glass fibres
Answer: A) air or space without a physical conductor
Explanation: Wireless media use electromagnetic waves.
12. Which is less affected by noise?
- Digital transmission
- Analog transmission
- Both equally
- Neither can carry data
Answer: A) Digital transmission
Explanation: Digital signals can be exactly regenerated.
13. In fibre optics, light stays inside the core because of:
- air pressure
- total internal reflection
- magnetism
- static electricity
Answer: B) total internal reflection
Explanation: The cladding has a lower refractive index.
14. A DSL modem provides broadband Internet over:
- telephone lines
- infrared
- power cables only
- satellite only
Answer: A) telephone lines
Explanation: DSL = Digital Subscriber Line.
15. GPS and direct-to-home TV mainly use:
- infrared
- Bluetooth
- satellite communication
- twisted pair
Answer: C) satellite communication
Explanation: Signals are relayed by satellites.
16. A set of rules that governs data communication is called a:
- medium
- message
- protocol
- modem
Answer: C) protocol
Explanation: Protocols define format, timing and error handling.
17. In serial transmission, bits are sent:
- one after another over a single line
- without any medium
- only by satellite
- all at once over many lines
Answer: A) one after another over a single line
Explanation: Serial is used for long distances (USB, Ethernet).
18. Fibre-optic cables carry data as:
- sound waves
- electric current
- radio waves
- pulses of light
Answer: D) pulses of light
Explanation: Light travels through a glass core.
19. Digital signals are regenerated over long distances using:
- amplifiers only
- repeaters
- printers
- modems only
Answer: B) repeaters
Explanation: Repeaters rebuild clean digital pulses.
20. Which is more efficient for large data transfers?
- Asynchronous transmission
- Simplex printing
- Manual transmission
- Synchronous transmission
Answer: D) Synchronous transmission
Explanation: No start/stop bits for every character.
21. In asynchronous transmission data is sent:
- without any bits
- only by satellite
- as large blocks with a shared clock
- one character at a time with start and stop bits
Answer: D) one character at a time with start and stop bits
Explanation: Each byte is framed by start and stop bits.
22. A digital signal has:
- discrete values such as 0 and 1
- only sound
- infinite smoothly changing values
- no use in computers
Answer: A) discrete values such as 0 and 1
Explanation: Digital signals are discrete pulses.
23. Modulation means converting:
- analog signals to digital
- light to sound only
- text to images
- digital signals to analog
Answer: D) digital signals to analog
Explanation: At the sender, digital data is modulated onto an analog carrier.
24. Human voice on an old telephone line is an example of a(n):
- binary file
- digital signal
- analog signal
- packet
Answer: C) analog signal
Explanation: Voice varies continuously.
25. Sending a signal from an earth station up to a satellite is called:
- uplink
- modulation only
- downlink
- crosstalk
Answer: A) uplink
Explanation: The return path is the downlink.
Page 1 of 2 Next
Practise Data Communication and Transmission Media MCQs
More Computer Science chapters
- Unit 1: Computer Systems MCQs
- Introduction and History of Computers MCQs
- Introduction to Mobile Applications and Platforms MCQs
- Unit 2: Computational Thinking and Algorithms MCQs
- Types of Computers and Basic Operations MCQs
- HTML5 for Mobiles MCQs
- Unit 3: Programming Fundamentals MCQs
- Input and Output Devices MCQs
- Android OS: Architecture, Framework and Application Development MCQs
- Unit 4: Data and Analysis MCQs
- Storage Units and Memory MCQs
- iOS: Architecture and Framework MCQs