Which type of wave is primarily used in wireless communication?
a) Sound waves
b) Radio waves
c) Water waves
d) Seismic waves
Which law governs the propagation of electromagnetic waves in free space?
a) Ohm’s Law
b) Maxwell’s Equations
c) Newton’s Laws
d) Hooke’s Law
What is the speed of electromagnetic waves in a vacuum?
a) 300,000 km/s
b) 150,000 km/s
c) 100,000 km/s
d) 30,000 km/s
Which component of a telecommunications system is responsible for converting electrical signals into radio waves?
a) Modulator
b) Transmitter
c) Receiver
d) Amplifier
Which type of modulation varies the frequency of a carrier wave?
a) Amplitude Modulation (AM)
b) Frequency Modulation (FM)
c) Phase Modulation (PM)
d) Pulse Modulation (PM)
Which part of the electromagnetic spectrum is commonly used for satellite communications?
a) Infrared
b) Microwave
c) Ultraviolet
d) X-rays
Which physical phenomenon causes a radio signal to bend around obstacles?
a) Reflection
b) Diffraction
c) Refraction
d) Absorption
What is the primary function of an antenna in telecommunications?
a) Store energy
b) Convert electric signals to electromagnetic waves
c) Process digital signals
d) Amplify weak signals
Which type of fiber optic cable is used for long-distance communication?
a) Single-mode fiber
b) Multi-mode fiber
c) Coaxial cable
d) Twisted pair cable
Which of the following best describes the function of a repeater in a communication system?
a) Generates new signals
b) Filters unwanted signals
c) Amplifies and retransmits signals
d) Converts analog signals to digital
Which wave property determines the data-carrying capacity of a signal?
a) Frequency
b) Amplitude
c) Wavelength
d) Phase
Which type of multiplexing is commonly used in fiber optic communication?
a) Frequency Division Multiplexing (FDM)
b) Wavelength Division Multiplexing (WDM)
c) Time Division Multiplexing (TDM)
d) Space Division Multiplexing (SDM)
What is the main advantage of fiber optic cables over copper cables?
a) Lower cost
b) Higher bandwidth
c) Less flexibility
d) Lower durability
Which component in a fiber optic system converts electrical signals into optical signals?
a) Photodetector
b) LED or Laser Diode
c) Modulator
d) Amplifier
Which phenomenon allows optical fibers to transmit light over long distances?
a) Refraction
b) Diffraction
c) Total Internal Reflection
d) Polarization
Which type of signal transmission is least affected by electromagnetic interference?
a) Coaxial cable
b) Twisted pair
c) Fiber optics
d) AM radio
Which of the following is the primary disadvantage of using radio waves for communication?
a) High data transfer speed
b) Limited bandwidth
c) Low propagation speed
d) High signal strength
Which device is used to increase the signal strength in a communication system?
a) Modulator
b) Amplifier
c) Filter
d) Transducer
Which of the following is the unit of bandwidth in telecommunications?
a) Watt
b) Hertz
c) Joule
d) Newton
Which type of electromagnetic wave has the highest frequency?
a) Radio waves
b) Microwaves
c) Infrared waves
d) X-rays
Which physical principle is applied in mobile phone signal reception?
a) Doppler Effect
b) Photoelectric Effect
c) Pascal’s Law
d) Bernoulli’s Principle
Which property of radio waves allows them to be reflected by the ionosphere?
a) High frequency
b) Low frequency
c) Short wavelength
d) Large amplitude
Which of the following is an advantage of satellite communication?
a) Low energy consumption
b) High propagation delay
c) Wide coverage area
d) Poor signal strength
Which modulation technique is best suited for digital communication?
a) Amplitude Modulation
b) Frequency Modulation
c) Phase Shift Keying
d) Analog Modulation
Which component is essential in a mobile communication system to relay signals between devices?
a) Satellite
b) Base Station
c) Transformer
d) Capacitor
Which frequency band is used for 5G communication?
a) 300 MHz – 1 GHz
b) 1 GHz – 3 GHz
c) 3 GHz – 100 GHz
d) 100 GHz – 500 GHz
Which parameter of a wave determines the transmission speed of a signal?
a) Frequency
b) Wavelength
c) Amplitude
d) Phase
Which technology enables multiple signals to be sent simultaneously over a single communication channel?
a) Multiplexing
b) Modulation
c) Attenuation
d) Sampling
Which type of satellite orbits the Earth at the same rate as the planet’s rotation?
a) Low Earth Orbit (LEO)
b) Medium Earth Orbit (MEO)
c) Geostationary Orbit (GEO)
d) Polar Orbit
