Chapter 11: Data Communication — Online MCQ Test
COMPUTER SCIENCE · Grade 12 · CBSE(NCERT)
Practice Chapter 11: Data Communication with a free chapter-wise online MCQ test.
This chapter covers: network topologies - star topology - bus topology - tree topology - transmission media - twisted pair - optical fiber - radio waves - hubs - switches - routers - gateways.
AI-generated questions from basic to board-exam level, with instant results and explanations.
Chapter 11: Data Communication — Important Questions & Answers
Which term refers to the physical or logical arrangement of computers and other devices in a network?
- A. Network protocol
- B. Network topology
- C. Transmission medium
- D. Network address
Answer: B. Network topology
Network topology describes how devices are arranged and connected in a network.
Network topology describes how devices are arranged and connected in a network.
In a star topology, all nodes are connected to a central device such as a ________.
- A. Terminator
- B. Hub or switch
- C. Printer
- D. Modem only
Answer: B. Hub or switch
In star topology, each node is directly connected to a central hub or switch.
In star topology, each node is directly connected to a central hub or switch.
Which topology uses a single common backbone cable to connect all devices?
- A. Star topology
- B. Bus topology
- C. Tree topology
- D. Mesh topology
Answer: B. Bus topology
In bus topology, all devices share one main communication cable called the bus or backbone.
In bus topology, all devices share one main communication cable called the bus or backbone.
Optical fibre transmits data mainly in the form of:
- A. Electrical pulses
- B. Sound waves
- C. Light signals
- D. Magnetic signals
Answer: C. Light signals
Optical fibre uses light signals to transmit data through glass or plastic fibres.
Optical fibre uses light signals to transmit data through glass or plastic fibres.
In a star topology, what happens if the central hub or switch fails?
- A. Only one computer is affected
- B. The entire network may stop working
- C. The network automatically becomes a bus topology
- D. Data transmission becomes faster
Answer: B. The entire network may stop working
Since all nodes depend on the central device in star topology, failure of that device can bring down the whole network.
Since all nodes depend on the central device in star topology, failure of that device can bring down the whole network.
Which of the following is NOT a transmission medium?
- A. Twisted pair cable
- B. Optical fibre
- C. Radio waves
- D. Router
Answer: D. Router
A router is a network device, while twisted pair, optical fibre and radio waves are transmission media.
A router is a network device, while twisted pair, optical fibre and radio waves are transmission media.
In a star topology, if the cable connecting one computer to the central switch breaks, what is the most likely effect?
- A. Only that computer gets disconnected
- B. All computers stop communicating
- C. The network becomes a bus topology
- D. The switch becomes a router
Answer: A. Only that computer gets disconnected
In star topology, each node has an independent link to the central device, so a single link failure usually affects only that node.
In star topology, each node has an independent link to the central device, so a single link failure usually affects only that node.
A company needs to connect two buildings on a campus with high-speed data transfer and minimum electromagnetic interference. Which medium is most suitable?
- A. Twisted pair cable
- B. Optical fibre
- C. Radio waves only
- D. Ordinary telephone wire
Answer: B. Optical fibre
Optical fibre supports high bandwidth and is immune to electromagnetic interference, making it suitable for such connections.
Optical fibre supports high bandwidth and is immune to electromagnetic interference, making it suitable for such connections.
Which situation most clearly requires a gateway rather than only a router?
- A. Connecting two devices in the same star LAN
- B. Connecting two networks that use different communication protocols
- C. Connecting a computer to a switch using twisted pair cable
- D. Broadcasting a signal from a hub to all connected computers
Answer: B. Connecting two networks that use different communication protocols
A gateway is required when communication involves dissimilar networks or different protocols, because it can perform protocol conversion.
A gateway is required when communication involves dissimilar networks or different protocols, because it can perform protocol conversion.
A lab has 20 computers. The administrator wants easy troubleshooting, but also knows that one central device failure can stop the whole network. Which topology is being considered?
- A. Bus topology
- B. Star topology
- C. Radio wave topology
- D. Peer-only topology
Answer: B. Star topology
Star topology makes individual cable faults easier to locate, but the central hub or switch is a single point of failure.
Star topology makes individual cable faults easier to locate, but the central hub or switch is a single point of failure.