Chapter Exam

Chapter 11: Data Communication — Online MCQ Test

Q: Which term refers to the physical or logical arrangement of computers and other devices in a network?

Answer: B. Network topology — Network topology describes how devices are arranged and connected in a network.

Q: In a star topology, all nodes are connected to a central device such as a ________.

Answer: B. Hub or switch — In star topology, each node is directly connected to a central hub or switch.

Q: Which topology uses a single common backbone cable to connect all devices?

Answer: B. Bus topology — In bus topology, all devices share one main communication cable called the bus or backbone.

Q: Optical fibre transmits data mainly in the form of:

Answer: C. Light signals — Optical fibre uses light signals to transmit data through glass or plastic fibres.

Q: In a star topology, what happens if the central hub or switch fails?

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.

Q: Which of the following is NOT a transmission medium?

Answer: D. Router — A router is a network device, while twisted pair, optical fibre and radio waves are transmission media.

Q: In a star topology, if the cable connecting one computer to the central switch breaks, what is the most likely effect?

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.

Q: A company needs to connect two buildings on a campus with high-speed data transfer and minimum electromagnetic interference. Which medium is most suitable?

Answer: B. Optical fibre — Optical fibre supports high bandwidth and is immune to electromagnetic interference, making it suitable for such connections.

Q: 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?

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.

COMPUTER SCIENCE · Grade 12 · CBSE(NCERT)

Practice Chapter 11: Data Communication with a free chapter-wise online MCQ test for CBSE(NCERT) Grade 12 COMPUTER SCIENCE. 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.

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Chapter 11: Data Communication — Important Questions & Answers (FAQ)

Frequently asked questions from CBSE(NCERT) Grade 12 COMPUTER SCIENCE — Chapter 11: Data Communication, with answers and explanations. These are sample questions; the exam has its own separate question set.

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.

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.

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.

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.

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.

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.

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.

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.

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 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.

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