Chapter Exam

Chapter-10 Computer Networks — Online MCQ Test

Q: Which network topology connects all devices to a central device?

Answer: A. Star topology — Star topology has all computers connected to a central hub or switch, making it the defining characteristic of this topology.

Q: In a bus topology, all devices are connected to a single ___________.

Answer: B. Central cable or backbone — Bus topology uses a single shared communication line (backbone cable) to which all devices connect directly.

Q: Which transmission medium uses light pulses to transmit data?

Answer: C. Optical fiber — Optical fiber transmits data as light signals through a glass or plastic fiber, offering high bandwidth and security.

Q: In a star topology network, if the central hub fails, what happens to the network?

Answer: B. The entire network becomes non-functional — In star topology, the central hub is a single point of failure; if it fails, all connected devices lose network connectivity.

COMPUTER SCIENCE · Grade 12 · CBSE(NCERT)

Practice Chapter-10 Computer Networks 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-10 Computer Networks — Important Questions & Answers (FAQ)

Frequently asked questions from CBSE(NCERT) Grade 12 COMPUTER SCIENCE — Chapter-10 Computer Networks, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which network topology connects all devices to a central device?

A. Star topology ✓
B. Bus topology
C. Tree topology
D. Ring topology

Answer: A. Star topology
Star topology has all computers connected to a central hub or switch, making it the defining characteristic of this topology.

In a bus topology, all devices are connected to a single ___________.

A. Hub
B. Central cable or backbone ✓
C. Router
D. Gateway

Answer: B. Central cable or backbone
Bus topology uses a single shared communication line (backbone cable) to which all devices connect directly.

Which transmission medium uses light pulses to transmit data?

A. Twisted pair
B. Coaxial cable
C. Optical fiber ✓
D. Radio waves

Answer: C. Optical fiber
Optical fiber transmits data as light signals through a glass or plastic fiber, offering high bandwidth and security.

In a star topology network, if the central hub fails, what happens to the network?

A. Only one computer gets disconnected
B. The entire network becomes non-functional ✓
C. Other computers continue communicating
D. The network automatically reconfigures

Answer: B. The entire network becomes non-functional
In star topology, the central hub is a single point of failure; if it fails, all connected devices lose network connectivity.

Comparing star and bus topologies, which statement is TRUE?

A. Bus topology is more expensive than star topology
B. Star topology has a single point of failure at the central device ✓
C. Bus topology offers better security than star topology
D. Both topologies have identical bandwidth efficiency

Answer: B. Star topology has a single point of failure at the central device
Star topology's central hub is a single point of failure; if it fails, the entire network goes down, whereas bus topology is more fault-tolerant.