Transmission Media & Network Devices MCQs | 25 Practice Questions with Answers | CBSE Class 12 Computer Science
Class 12 · Computer Science
Transmission Media & Network Devices MCQs (25 Questions)
Practice these multiple-choice questions to strengthen your understanding of Transmission Media and Network Devices. Click Show Answer to reveal the correct answer and explanation.
Q1. Transmission media is used to:
A. Store data permanently.
B. Transfer data from one device to another.
C. Process data.
D. Compile programs.
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Answer: B. Transfer data from one device to another.
Explanation: Transmission media provides the communication path through which data travels between devices.
Q2. Which of the following is a wired communication medium?
A. Radio Waves
B. Infrared Waves
C. Twisted Pair Cable
D. Microwaves
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Answer: C. Twisted Pair Cable
Explanation: Twisted pair cable is a guided (wired) transmission medium.
Q3. Which wired transmission medium provides the highest data transmission speed?
A. Twisted Pair Cable
B. Co-axial Cable
C. Fiber Optic Cable
D. Telephone Cable
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Answer: C. Fiber Optic Cable
Explanation: Fiber optic cable transmits data using light signals and offers the highest speed and bandwidth.
Q4. Which cable is commonly used in telephone networks and LANs?
A. Fiber Optic Cable
B. Twisted Pair Cable
C. Co-axial Cable
D. HDMI Cable
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Answer: B. Twisted Pair Cable
Explanation: Twisted pair cable is widely used in telephone systems and Ethernet LANs.
Q5. Co-axial cable is commonly used for:
A. Cable Television Networks
B. Bluetooth Communication
C. Wi-Fi Networks
D. Infrared Communication
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Answer: A. Cable Television Networks
Explanation: Co-axial cable is commonly used in cable TV and broadband Internet connections.
Q6. Which of the following is a wireless communication medium?
A. Fiber Optic Cable
B. Twisted Pair Cable
C. Radio Waves
D. Co-axial Cable
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Answer: C. Radio Waves
Explanation: Radio waves are unguided (wireless) transmission media.
Q7. Which wireless medium is commonly used in television broadcasting and mobile communication?
A. Infrared Waves
B. Radio Waves
C. Optical Fiber
D. Co-axial Cable
Show Answer
Answer: B. Radio Waves
Explanation: Radio waves are widely used for radio, television, and mobile communication.
Q8. Microwaves are mainly used for:
A. Satellite Communication
B. Printed Documents
C. Keyboard Connection
D. Optical Storage
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Answer: A. Satellite Communication
Explanation: Microwaves are commonly used in satellite communication and long-distance wireless communication.
Q9. Infrared waves are generally used for:
A. Remote Controls
B. Cable Television
C. Optical Fiber Networks
D. Telephone Networks
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Answer: A. Remote Controls
Explanation: Infrared waves are used for short-range communication such as TV remote controls.
Q10. Which transmission medium is least affected by electromagnetic interference?
A. Twisted Pair Cable
B. Co-axial Cable
C. Fiber Optic Cable
D. Radio Waves
Show Answer
Answer: C. Fiber Optic Cable
Explanation: Fiber optic cables use light instead of electrical signals, making them immune to electromagnetic interference.
Q11. Which device converts digital signals into analog signals and vice versa?
A. Hub
B. Switch
C. Modem
D. Router
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Answer: C. Modem
Explanation: A modem (Modulator-Demodulator) converts digital signals into analog signals for transmission and converts received analog signals back into digital form.
Q12. What does the term Modem stand for?
A. Modified Memory
B. Modular Device
C. Modulator-Demodulator
D. Modern Device
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Answer: C. Modulator-Demodulator
Explanation: A modem performs modulation and demodulation of signals.
Q13. Which device is also known as a Network Interface Card (NIC)?
A. Router
B. Ethernet Card
C. Gateway
D. Hub
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Answer: B. Ethernet Card
Explanation: An Ethernet Card or NIC enables a computer to connect to a wired network.
Q14. Which connector is commonly used with Ethernet cables?
A. USB Type-C
B. HDMI
C. RJ45
D. VGA
Show Answer
Answer: C. RJ45
Explanation: RJ45 connectors are used with twisted pair Ethernet cables.
Q15. Which network device regenerates weak signals to extend the communication distance?
A. Router
B. Switch
C. Repeater
D. Gateway
Show Answer
Answer: C. Repeater
Explanation: A repeater regenerates weakened signals before forwarding them to the next network segment.
Q16. Which device broadcasts incoming data to all connected devices?
A. Switch
B. Router
C. Hub
D. Gateway
Show Answer
Answer: C. Hub
Explanation: A hub sends incoming data to every connected device without checking the destination address.
Q17. Which device forwards data only to the intended destination device?
A. Hub
B. Switch
C. Repeater
D. Modem
Show Answer
Answer: B. Switch
Explanation: A switch uses MAC addresses to forward data only to the intended recipient.
Q18. Which network device connects different networks together?
A. Hub
B. Repeater
C. Router
D. RJ45
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Answer: C. Router
Explanation: A router connects different networks and forwards packets based on IP addresses.
Q19. Which device is used to connect networks that use different communication protocols?
A. Switch
B. Gateway
C. Hub
D. Repeater
Show Answer
Answer: B. Gateway
Explanation: A gateway translates between different network protocols, allowing dissimilar networks to communicate.
Q20. Which device enables a computer or laptop to connect to a wireless network?
A. RJ45 Connector
B. Wi-Fi Card
C. Repeater
D. Hub
Show Answer
Answer: B. Wi-Fi Card
Explanation: A Wi-Fi card allows a computer to communicate with wireless networks using radio signals.
Q21. Which network device reduces unnecessary network traffic by sending data only to the destination device?
A. Hub
B. Switch
C. Repeater
D. Modem
Show Answer
Answer: B. Switch
Explanation: A switch forwards data only to the intended destination device using the destination MAC address, thereby reducing unnecessary network traffic.
Q22. Which of the following devices operates using IP addresses to forward data between different networks?
A. Hub
B. Repeater
C. Router
D. RJ45 Connector
Show Answer
Answer: C. Router
Explanation: A router uses IP addresses to determine the best path for forwarding data packets between networks.
Q23. Which statement correctly differentiates a Hub and a Switch?
A. A Hub sends data only to the destination device, whereas a Switch broadcasts data to all devices.
B. A Hub broadcasts data to all connected devices, whereas a Switch sends data only to the intended destination.
C. Both Hub and Switch work exactly the same way.
D. A Hub connects different networks, whereas a Switch converts analog signals into digital signals.
Show Answer
Answer: B.
Explanation: A hub broadcasts data to all connected devices, while a switch forwards data only to the intended destination, improving network efficiency.
Q24. Which of the following combinations is correctly matched?
A. Modem — Connects different networks using IP addresses
B. Repeater — Regenerates weak signals
C. RJ45 — Wireless network adapter
D. Gateway — Broadcasts data to all devices
Show Answer
Answer: B. Repeater — Regenerates weak signals
Explanation: A repeater strengthens weak signals to extend the communication distance. The other options are incorrectly matched.
Q25. Which statement about transmission media and network devices is correct?
A. Fiber optic cable offers very high bandwidth and is immune to electromagnetic interference.
B. RJ45 connector is used with Ethernet cables.
C. A Wi-Fi card enables wireless network connectivity.
D. All of these.
Show Answer
Answer: D. All of these.
Explanation: Fiber optic cable provides high-speed communication with immunity to electromagnetic interference, RJ45 is used with Ethernet cables, and a Wi-Fi card enables wireless communication.
Answer Key
| Q.No. | Answer | Q.No. | Answer | Q.No. | Answer |
|---|---|---|---|---|---|
| 1 | B | 10 | C | 19 | B |
| 2 | C | 11 | C | 20 | B |
| 3 | C | 12 | C | 21 | B |
| 4 | B | 13 | B | 22 | C |
| 5 | A | 14 | C | 23 | B |
| 6 | C | 15 | C | 24 | B |
| 7 | B | 16 | C | 25 | D |
| 8 | A | 17 | B | ||
| 9 | A | 18 | C |
Practice Tips
- Classify transmission media into two categories:
- Wired (Guided): Twisted Pair Cable, Co-axial Cable, Fiber Optic Cable
- Wireless (Unguided): Radio Waves, Microwaves, Infrared Waves
- Remember the key features of wired media:
- Twisted Pair Cable: Low cost, commonly used in LANs and telephone networks.
- Co-axial Cable: Better shielding, used in cable TV and broadband connections.
- Fiber Optic Cable: Highest bandwidth, fastest transmission speed, immune to electromagnetic interference.
- Revise wireless communication media:
- Radio Waves: Radio, television broadcasting, and mobile communication.
- Microwaves: Satellite communication and long-distance wireless links.
- Infrared Waves: Short-range communication such as TV remote controls.
- Know the functions of important network devices:
- Modem: Converts digital and analog signals.
- Ethernet Card (NIC): Connects a computer to a wired network.
- RJ45: Connector used with Ethernet cables.
- Repeater: Regenerates weak signals.
- Hub: Broadcasts data to all connected devices.
- Switch: Sends data only to the intended destination device.
- Router: Connects different networks using IP addresses.
- Gateway: Connects networks using different communication protocols.
- Wi-Fi Card: Enables wireless network connectivity.
- Remember these common CBSE comparisons:
- Hub vs Switch
- Router vs Gateway
- Twisted Pair vs Co-axial vs Fiber Optic Cable
- Radio Waves vs Microwaves vs Infrared Waves
- Practice application-based questions related to selecting the appropriate transmission medium or network device for real-life situations, as these are frequently asked in CBSE examinations.