Vaidikalaya

MCQ On Transmission Media

Q1. Which of the following is not a guided (wired) medium?.
  1. Twisted pair cable
  2. Coaxial cable
  3. Optical fiber
  4. Microwave

Answer: d, Microwave

Q2. Which of the following is a guided transmission medium?.
  1. Radio waves
  2. Microwave
  3. Coaxial cable
  4. Infrared

Answer: c, Coaxial cable

Q3. Twisted pair cables are mainly used for:.
  1. Long-distance communication
  2. Local telephone networks
  3. Satellite communication
  4. Optical data transfer

Answer: b, Local telephone networks

Solution: Twisted pair cables are mostly used for telephone lines and local communication networks.

Q4. Which of the following is NOT a type of twisted pair cable?.
  1. UTP
  2. STP
  3. Coaxial
  4. FTP

Answer: c, Coaxial

Solution: Coaxial cable is not a twisted pair type; it's a completely different transmission medium.

Q5. The main purpose of twisting the wires in a twisted pair cable is:.
  1. Increase bandwidth
  2. Reduce attenuation
  3. Reduce electromagnetic interference
  4. Increase cable length

Answer: c, Reduce electromagnetic interference

Solution: Twisting reduces EMI and crosstalk by cancelling out electromagnetic interference.

Q6. UTP stands for:.
  1. Unified Twisted Pair
  2. Unshielded Twisted Pair
  3. Unstructured Transfer Protocol
  4. Universal Transmission Path

Answer: b, Unshielded Twisted Pair

Solution: UTP stands for Unshielded Twisted Pair, a common cable used in networking.

Q7. Twisted pair cable bandwidth mainly depends on:.
  1. Length of cable
  2. Category rating
  3. Number of users
  4. Type of network protocol

Answer: b, Category rating

Solution: Bandwidth capacity is defined by the cable category (Cat5, Cat6, Cat7, etc.).

Q8. Shielding in STP cable protects against:.
  1. Crosstalk only
  2. EMI only
  3. Both crosstalk & EMI
  4. Attenuation only

Answer: c, Both crosstalk & EMI

Solution: STP cable has shielding to protect signals from both EMI and crosstalk.

Q9. Which of the following is the major disadvantage of twisted pair cable?.
  1. High cost
  2. Difficult installation
  3. Susceptible to noise and interference
  4. Does not support LAN usage

Answer: c, Susceptible to noise and interference

Solution: Twisted pair cables are easily affected by electrical noise, making them less suitable for noisy environments.

Q10. Which layer of OSI model uses twisted pair cables for physical communication?.
  1. Data Link Layer
  2. Network Layer
  3. Transport Layer
  4. Physical Layer

Answer: d, Physical Layer

Solution: Physical layer handles actual electrical/physical transmission of bits, where cables like UTP are used.

Q11. Crosstalk in twisted pair occurs due to:.
  1. Improper earth connection
  2. Signal interference between adjacent wires
  3. Low bandwidth
  4. Cable overheating

Answer: b, Signal interference between adjacent wires

Solution: Crosstalk is caused when adjacent wires interfere with each other due to electromagnetic induction.

Q12. Coaxial cable consists of how many main components?.
  1. 2
  2. 3
  3. 4
  4. 5

Answer: c, 4

Solution: Coaxial cables have 4 main parts: core, insulator, shield, jacket.

Q13. Which of the following is an advantage of coaxial cable?.
  1. Very low cost
  2. High resistance to EMI
  3. Highest bandwidth
  4. No need for shielding

Answer: b, High resistance to EMI

Solution: Coaxial cables resist electromagnetic interference effectively.

Q14. Coaxial cable was mainly used in early LANs such as:.
  1. Token Ring
  2. Ethernet (10Base2, 10Base5)
  3. FDDI
  4. SONET

Answer: b, Ethernet (10Base2, 10Base5)

Solution: Coaxial cables were used in early Ethernet standards like 10Base2/5.

Q15. Coaxial cable supports data transmission at distances up to:.
  1. A few meters
  2. 100 meters
  3. Several kilometers
  4. 500 meters

Answer: c, Several kilometers

Solution: Coaxial supports long-distance transmissions, often several km.

Q16. Which part provides protection from EMI?.
  1. Outer jacket
  2. Dielectric insulator
  3. Metal shielding
  4. Copper core

Answer: c, Metal shielding

Solution: The metallic braid/shield protects against EMI.

Q17. The central core of coaxial cable is made of:.
  1. Glass
  2. Copper
  3. Plastic
  4. Aluminum foil

Answer: b, Copper

Solution: Copper core carries the signal in coaxial cables.

Q18. Coaxial cable is most commonly used today for:.
  1. LAN cabling
  2. Crossover connections
  3. Cable TV networks
  4. Satellite uplinks

Answer: c, Cable TV networks

Solution: Coaxial is widely used for cable TV distribution.

Q19. The bandwidth offered by coaxial cable is typically:.
  1. Lower than twisted pair
  2. Higher than twisted pair
  3. Same as fiber optics
  4. Zero

Answer: b, Higher than twisted pair

Solution: Coaxial has higher bandwidth than twisted pair cables.

Q20. Which is a major disadvantage of coaxial cable?.
  1. Good shielding
  2. Expensive and bulky
  3. High noise immunity
  4. Long-distance support

Answer: b, Expensive and bulky

Solution: Coaxial cables are bulky and cost more than twisted pair.

Q21. The shielding in coaxial cable mainly reduces:.
  1. Bandwidth
  2. Crosstalk
  3. EMI
  4. Data encapsulation

Answer: c, EMI

Solution: Shielding reduces Electromagnetic Interference.

Q22. Frequency range used in coaxial cable TV transmission:.
  1. 1–10 MHz
  2. 50–100 MHz
  3. 50–1000 MHz
  4. 2–5 GHz

Answer: c, 50–1000 MHz

Solution: Cable TV uses frequencies from 50 to 1000 MHz.

Q23. Fiber optic cable transmits data using:.
  1. Electric signals
  2. Radio waves
  3. Light signals
  4. Microwave signals

Answer: c, Light signals

Solution: Optical fibers use light for communication.

Q24. Material used in fiber optic core:.
  1. Copper
  2. Plastic
  3. Glass or plastic
  4. Aluminum

Answer: c, Glass or plastic

Solution: Core is made of glass/plastic to guide light.

Q25. Principle allowing light to travel:.
  1. Electrical conduction
  2. Magnetic induction
  3. Total internal reflection
  4. Amplification

Answer: c, Total internal reflection

Solution: Light is guided inside fiber using total internal reflection.

Q26. NOT a type of fiber optic cable:.
  1. Single-mode
  2. Multi-mode
  3. Plastic fiber
  4. RG-58

Answer: d, RG-58

Solution: RG-58 is a coaxial cable, not fiber optic.

Q27. Advantage of fiber optics:.
  1. Low bandwidth
  2. High attenuation
  3. Immunity to EMI
  4. Cheap installation

Answer: c, Immunity to EMI

Solution: Optical fibers are immune to EMI.

Q28. Single-mode fiber uses which source?.
  1. LED
  2. Laser
  3. Halogen
  4. Infrared lamp

Answer: b, Laser

Solution: Single-mode uses laser for long-distance communication.

Q29. Fiber type for long-distance:.
  1. Multi-mode
  2. Single-mode
  3. Plastic fiber
  4. Coaxial

Answer: b, Single-mode

Solution: Single-mode supports long-distance transmissions.

Q30. Outer protective layer of fiber optic cable:.
  1. Jacket
  2. Cladding
  3. Buffer coating
  4. Core

Answer: a, Jacket

Solution: The outermost layer is called the jacket.

Q31. Disadvantage of fiber optic cable:.
  1. Low attenuation
  2. Immune to noise
  3. Difficult to install/expensive
  4. High bandwidth

Answer: c, Difficult to install/expensive

Solution: Fiber is costly and difficult to install.

Q32. Propagation method in multi-mode fiber:.
  1. Single ray
  2. Multiple rays
  3. Infrared only
  4. None

Answer: b, Multiple rays

Solution: Multi-mode fiber carries multiple light rays.

Q33. NOT an application of fiber optic:.
  1. Telephone networks
  2. Internet backbone
  3. Cable TV
  4. Low-speed wiring

Answer: d, Low-speed wiring

Solution: Fiber is not used for very low?speed wiring.

Q34. Radio waves are a type of:.
  1. Mechanical
  2. Sound
  3. Electromagnetic
  4. Water waves

Answer: c, Electromagnetic

Solution: Radio waves fall under EM waves.

Q35. Radio waves operate in range:.
  1. 3 kHz–300 GHz
  2. 30 MHz–30 GHz
  3. 1 GHz–1000 GHz
  4. 300 Hz–3 kHz

Answer: a, 3 kHz–300 GHz

Solution: Radio spectrum extends from 3 kHz to 300 GHz.

Q36. Propagation property of radio waves:.
  1. Need LOS
  2. Can't penetrate walls
  3. Penetrate buildings & travel long distances
  4. Absorbed easily

Answer: c, Penetrate buildings & travel long distances

Solution: Radio waves can travel long distances and penetrate walls.

Q37. Technology using radio waves:.
  1. Ethernet
  2. Bluetooth
  3. Fiber optic
  4. Telephone wires

Answer: b, Bluetooth

Solution: Bluetooth uses radio frequency communication.

Q38. Major disadvantage of radio waves:.
  1. Limited range
  2. High data rate
  3. Interference & hacking
  4. Cannot propagate

Answer: c, Interference & hacking

Solution: Radio waves are prone to interference.

Q39. Propagation for long distances (radio):.
  1. Ground
  2. Space
  3. Line-of-sight
  4. Underwater

Answer: a, Ground

Solution: Ground propagation used for low-frequency long-range radio.

Q40. Uses AM & FM:.
  1. Microwave
  2. Satellite links
  3. Radio broadcasting
  4. Laser

Answer: c, Radio broadcasting

Solution: AM/FM used in broadcast radio.

Q41. Wavelength of radio waves:.
  1. Very long
  2. Very short
  3. Same as IR
  4. Equal to microwaves

Answer: a, Very long

Solution: Radio waves have the longest wavelengths in EM spectrum.

Q42. OSI layer for radio wave transmission:.
  1. Network
  2. Data Link
  3. Transport
  4. Physical

Answer: d, Physical

Solution: Physical layer handles radio transmission.

Q43. NOT a characteristic of radio waves:.
  1. Omnidirectional
  2. Travel long distances
  3. Blocked easily by obstacles
  4. Used in mobile communication

Answer: c, Blocked easily by obstacles

Solution: Radio waves are not easily blocked.

Q44. Radio waves suffer from:.
  1. Attenuation
  2. Dispersion
  3. Interference
  4. Fiber breakage

Answer: c, Interference

Solution: Radio waves face significant interference issues.

Q45. Device using radio waves:.
  1. NIC (wired)
  2. Wi-Fi router
  3. DSL modem
  4. Switch

Answer: b, Wi-Fi router

Solution: Wi-Fi uses radio wave communication.

Q46. Radio waves best suited for:.
  1. Short-distance wired
  2. Long-distance wireless
  3. Underground
  4. Fiber networks

Answer: b, Long-distance wireless

Solution: Radio waves excel for long-distance wireless.

Q47. Microwaves are a type of:.
  1. Mechanical
  2. Electromagnetic
  3. Sound
  4. Electrical

Answer: b, Electromagnetic

Solution: Microwaves are EM waves.

Q48. Microwave frequency:.
  1. 3 kHz–300 kHz
  2. 3 MHz–30 MHz
  3. 300 MHz–300 GHz
  4. 3 GHz–30 GHz

Answer: c, 300 MHz–300 GHz

Solution: Microwave spectrum spans 300 MHz–300 GHz.

Q49. Microwave propagation:.
  1. Omni
  2. Ground
  3. Line-of-sight
  4. Underwater

Answer: c, Line-of-sight

Solution: Microwaves require LOS.

Q50. Microwave communication used in:.
  1. Fiber
  2. Satellite
  3. Coaxial
  4. Telephone wires

Answer: b, Satellite

Solution: Satellites use microwave links.

Q51. Microwave antennas:.
  1. Parabolic
  2. Omni
  3. Dipole
  4. Whip

Answer: a, Parabolic

Solution: Microwaves commonly use parabolic antennas.

Q52. Microwave signals are:.
  1. Bidirectional
  2. Unidirectional
  3. Reflected easily
  4. Not affected

Answer: b, Unidirectional

Solution: Microwaves typically travel in one direction (LOS).

Q53. Disadvantage of microwave:.
  1. High data rate
  2. High bandwidth
  3. Requires LOS
  4. Minimal interference

Answer: c, Requires LOS

Solution: Microwaves require clear LOS.

Q54. Microwave used for:.
  1. Underwater
  2. LAN
  3. Cellular & satellite
  4. Cable TV

Answer: c, Cellular & satellite

Solution: Cellular networks rely on microwaves.

Q55. Affected by rain:.
  1. Fiber
  2. Microwave
  3. Coaxial
  4. Twisted pair

Answer: b, Microwave

Solution: Microwaves experience rain fade.

Q56. Microwave towers spacing:.
  1. 100–200km
  2. 2–5km
  3. 10–50km
  4. 1–2km

Answer: c, 10–50km

Solution: Microwave towers are spaced 10–50 km apart.

Q57. OSI layer for microwaves:.
  1. Network
  2. Data Link
  3. Physical
  4. Transport

Answer: c, Physical

Solution: Microwave transmission occurs at the physical layer.

Q58. Satellite microwave bands:.
  1. L-band
  2. S-band
  3. C-band
  4. All of the above

Answer: d, All of the above

Solution: All are used in satellite links.

Q59. Microwave issue:.
  1. Crosstalk
  2. Multipath fading
  3. Attenuation
  4. Resistance

Answer: b, Multipath fading

Solution: Microwaves suffer multipath fading.

Q60. Device essential for microwave:.
  1. Repeater
  2. Modem
  3. Switch
  4. Router

Answer: a, Repeater

Solution: Repeaters boost microwave signals.

Q61. Wavelength of microwaves:.
  1. Very long
  2. Medium
  3. Very short
  4. Same as IR

Answer: c, Very short

Solution: Microwaves have very short wavelengths.

Q62. Infrared waves are:.
  1. Mechanical
  2. Electromagnetic
  3. Radioactive
  4. Sound

Answer: b, Electromagnetic

Solution: Infrared waves are EM waves.

Q63. Infrared frequency:.
  1. 300GHz–400THz
  2. 3kHz–300kHz
  3. 300MHz–300GHz
  4. 3THz–30THz

Answer: a, 300GHz–400THz

Solution: Infrared operates from 300 GHz to 400 THz.

Q64. Best describes IR:.
  1. Omni
  2. Requires LOS
  3. Penetrates walls
  4. Long range

Answer: b, Requires LOS

Solution: Infrared generally requires LOS.

Q65. Device using IR:.
  1. Router
  2. TV remote
  3. Fiber modem
  4. Dish

Answer: b, TV remote

Solution: TV remotes use IR.

Q66. Limitation of IR:.
  1. High cost
  2. Low data rate
  3. Blocked by obstacles
  4. Causes interference

Answer: c, Blocked by obstacles

Solution: IR cannot pass through obstacles.

Q67. IR used for:.
  1. Underwater
  2. Wireless LAN
  3. Long distance
  4. Towers

Answer: b, Wireless LAN

Solution: IR used in short?range WLANs.

Q68. IR in remotes:.
  1. Diffused
  2. Point-to-point
  3. Reflective
  4. Omni

Answer: b, Point-to-point

Solution: IR remotes use point-to-point.

Q69. IR cannot pass through:.
  1. Air
  2. Plastic
  3. Human bodies
  4. Walls

Answer: d, Walls

Solution: IR signals cannot penetrate walls.

Q70. Advantage of IR:.
  1. Immune to radio interference
  2. Pass walls
  3. Infinite range
  4. Expensive

Answer: a, Immune to radio interference

Solution: IR is not affected by RF interference.

Q71. IR suitable range:.
  1. Kilometers
  2. 1–2km
  3. Cm to meters
  4. 5–10km

Answer: c, Cm to meters

Solution: IR works within a few meters.

Q72. IR noise due to:.
  1. TV
  2. Sunlight/heat
  3. Electric wires
  4. WiFi

Answer: b, Sunlight/heat

Solution: Sunlight produces IR noise.

Q73. OSI layer for IR:.
  1. Network
  2. Transport
  3. Physical
  4. Session

Answer: c, Physical

Solution: IR operates at the physical layer.

Q74. IR safety:.
  1. High-frequency
  2. No radio interference
  3. Non-ionizing
  4. No EM properties

Answer: c, Non-ionizing

Solution: IR is safe because it's non-ionizing.

Q75. Most secure IR type:.
  1. Diffused
  2. Broadcast
  3. Point-to-point
  4. Omni

Answer: c, Point-to-point

Solution: Point-to-point IR is hardest to intercept.