26. Maximum speed of a dial-up modem is about:
- 1 Gbps
- 10 Tbps
- 100 Mbps
- 56 Kbps
Answer: D) 56 Kbps
Explanation: Dial-up modems are very slow.
MCQs / Computer Science / Data Communication and Transmission Media
Data Communication and Transmission Media MCQs — Computer Science (page 2)
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.
27. Which medium offers the highest bandwidth and is immune to electromagnetic interference?
- Coaxial cable
- Twisted pair
- Infrared
- Fibre-optic cable
Answer: D) Fibre-optic cable
Explanation: Light is not affected by EMI.
28. Modem speed is measured in:
- bits per second (bps)
- dots per inch
- pages per minute
- RPM
Answer: A) bits per second (bps)
Explanation: e.g. 56 Kbps for dial-up.
29. The data-carrying capacity of a channel is called:
- bandwidth
- noise
- latency only
- protocol
Answer: A) bandwidth
Explanation: Measured in bits per second for digital channels.
30. Microwave transmission requires:
- a copper cable
- line of sight between antennas
- no antenna
- a fibre core
Answer: B) line of sight between antennas
Explanation: Microwaves travel in straight lines.
31. Cable TV commonly uses:
- infrared
- twisted pair only
- coaxial cable
- Bluetooth
Answer: C) coaxial cable
Explanation: Coax carries TV signals.
32. Which connector is used with twisted-pair Ethernet cables?
- RJ-45
- HDMI
- BNC only
- VGA
Answer: A) RJ-45
Explanation: RJ-45 connects LAN cables.
33. Wires in twisted-pair cables are twisted to:
- carry light
- reduce electromagnetic interference (crosstalk)
- make them cheaper only
- increase weight
Answer: B) reduce electromagnetic interference (crosstalk)
Explanation: Twisting cancels interference.
34. Data communication is the exchange of data between devices through a:
- monitor
- compiler
- spreadsheet
- transmission medium
Answer: D) transmission medium
Explanation: A medium (wire or wireless) carries the signals.
35. Unwanted interference that corrupts a signal is called:
- protocol
- bandwidth
- noise
- baud
Answer: C) noise
Explanation: Noise causes transmission errors.
36. Wi-Fi and Bluetooth use:
- fibre optics
- infrared only
- coaxial cable
- radio waves
Answer: D) radio waves
Explanation: Both are radio-based wireless technologies.
37. Start and stop bits are used in:
- parallel buses only
- synchronous transmission
- asynchronous transmission
- fibre-optic light pulses only
Answer: C) asynchronous transmission
Explanation: They mark the beginning and end of each character.
38. How many basic components does a data communication system have?
- Ten
- Two
- Five
- Three
Answer: C) Five
Explanation: Message, sender, receiver, medium and protocol.
39. Which characteristic of data communication means data must arrive without errors?
- Accuracy
- Delivery
- Timeliness
- Jitter
Answer: A) Accuracy
Explanation: Accuracy = correct, uncorrupted data.
40. A disadvantage of unguided media compared to guided media is:
- less security and more interference
- no use for phones
- no mobility
- need for cables everywhere
Answer: A) less security and more interference
Explanation: Wireless signals can be intercepted and disturbed.
41. UTP stands for:
- Under Twisted Pipe
- Unified Transmission Protocol
- Universal Transfer Port
- Unshielded Twisted Pair
Answer: D) Unshielded Twisted Pair
Explanation: UTP has no extra metal shielding.
42. MODEM stands for:
- Modern Device Memory
- Monitor Decoder
- Modulator–Demodulator
- Mode Emitter
Answer: C) Modulator–Demodulator
Explanation: It modulates and demodulates signals.
43. Which wireless medium cannot pass through walls?
- Wi-Fi
- Satellite signals
- Infrared
- Radio waves
Answer: C) Infrared
Explanation: Infrared is blocked by solid objects.
44. Synchronous transmission sends data:
- one character at a time with gaps
- only as analog sound
- as blocks/frames with sender and receiver clocks synchronised
- only through infrared
Answer: C) as blocks/frames with sender and receiver clocks synchronised
Explanation: It is faster and more efficient.
45. Parallel transmission is mainly suitable for:
- satellite links
- short distances
- intercontinental links
- undersea cables
Answer: B) short distances
Explanation: Multiple wires cause timing problems over long distances.
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Practise Data Communication and Transmission Media MCQs
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