What type of communication use Radio waves: Multicast
Description : An antenna located in a city is a source of radio waves. How much time does it take the wave to reach a town 12,000 km away from the city? a. 36 s b. 20 us c. 20 ms d. 40 ms
Last Answer : An antenna located in a city is a source of radio waves. How much time does it take the wave to reach a town 12,000 km away from the city? a. 36 s b. 20 us c. 20 ms d. 40 ms
Description : Radio frequency ranges from 30MHz to 1GHz and it is suitable for: a. Point to point transmission b. Omni directional transmission c. Local point to point transmission d. None of the above
Last Answer : Radio frequency ranges from 30MHz to 1GHz and it is suitable for: Local point to point transmission
Description : Regenerative repeaters are placed along the communication path to control: a. Power b. Noise c. Frequency d. Amplitude
Last Answer : Regenerative repeaters are placed along the communication path to control: Noise
Description : Ozone layer in the outer atmosphere helps us in – (1) reflecting radio waves and makes radio communication possible (2) regulating he temperature of atmosphere (3) absorbing cosmic ray particles (4) absorbing U-V radiations
Last Answer : (4) absorbing U-V radiations Explanation: The ozone layer is a layer in Earth's atmosphere containing relatively high concentrations of ozone (03) which absorbs 97- 99% of the Sun's medium-frequency ultraviolet light.
Description : Waves that are required for long distance wireless communication are – (1) Infrared rays (2) Ultraviolet rays (3) Radio waves (4) Microwaves
Last Answer : (3) Radio waves Explanation: Wireless communication is the transfer of information between two or more points that are not connected by an electrical conductor. With radio waves distances can be short ... , or as far as thousands or even millions of kilometres for deep-space radio communications.
Description : Which among the following waves is used for communication by artificial satellites? (1) Micro waves (2) Radio waves (3) A. M. (4) Frequency of 1016 series
Last Answer : (1) Micro waves Explanation: For fixed (point-to-point) services, communications satellites provide a microwave radio relay technology complementary to that of communication cables. They are also used ... is extensively used for point-to-point telecommunications (i.e., non broadcast uses).
Description : Pick out the wrong statement (A) The concentric atmosphere layer just above troposphere is called stratosphere, which is rich in ozone (B) Mesosphere is characterised by very low atmospheric ... radio waves used in the long distance radio communication are reflected back to earth by stratosphere
Last Answer : (D) The radio waves used in the long distance radio communication are reflected back to earth by stratosphere
Description : Ozone layer in the outer atmosphere helps us in (1) reflecting radio waves and makes radio communication possible (2) regulating the temperature of atmosphere (3) absorbing cosmic ray particles (4) absorbing U-V radiations
Last Answer : absorbing U-V radiations
Description : Waves that are required for long distance wireless communication are (1) Infrared rays (2) Ultraviolet rays (3) Radio waves (4) Microwaves
Last Answer : Radio waves
Description : Which among the following waves is used for communication by artificial satellites ? (1) Micro waves (2) Radio waves (3) A. M. (4) Frequency of 1016 series
Last Answer : Micro waves
Description : The basic element of radio communication system which generates radio waves is 1. micro phone 2. transmitter 3.transmitting antenna 4. Loudspeaker
Last Answer : The basic element of radio communication system which generates radio waves is transmitter
Description : An evanescent mode occurs when: a. A wave is attenuated rather than propagated. b. The propagation constant is purely imaginary. c. m = 0 = n so that all field components vanish. d. The wave frequency is the same as the cutoff frequency.
Last Answer : An evanescent mode occurs when: A wave is attenuated rather than propagated.
Description : A half wavelength Dipole antenna has _________ Radiation Pattern a. Hemispherical b. Omni-Directional c. Isotropic d. End fire
Last Answer : A half wavelength Dipole antenna has Omni-Directional Radiation Pattern
Description : At Service provider end IMEI number of MS is basically stored in: a. HLR b. VLR c. AUC d. EIR
Last Answer : At Service provider end IMEI number of MS is basically stored in: a. HLR b. VLR c. AUC d. EIR
Description : Which cable connects the subscriber telephone to the nearest end office in the local loop. a. Coaxial b. Fiber-optic c. Twisted-pair d. Both (b) and (c)
Last Answer : Which cable connects the subscriber telephone to the nearest end office in the local loop. a. Coaxial b. Fiber-optic c. Twisted-pair d. Both (b) and (c)
Description : Unlike coax and twisted pair, optical fibers are immune to a. High-frequency transmission b. Signal attenuation c. Power loss d. Electromagnetic interference
Last Answer : Unlike coax and twisted pair, optical fibers are immune to Electromagnetic interference
Description : The Fourier transform of a gate pulse is: a. Sinc function b. Triangular function c. Gate function d. Unit step unction
Last Answer : The Fourier transform of a gate pulse is: Sinc function
Description : Which of these materials requires the least value of magnetic field strength to magnetize it? a. Nickel b. Silver c. Tungsten d. Sodium chloride
Last Answer : Which of these materials requires the least value of magnetic field strength to magnetize it? a. Nickel b. Silver c. Tungsten d. Sodium chloride
Description : Where the poles should be placed on the unit circle for stable filter? a. Outside b. Inside c. both a & b d. none of the above
Last Answer : Where the poles should be placed on the unit circle for stable filter? a. Outside b. Inside c. both a & b d. none of the above
Description : Fast fading occurs if the channel____________ changes rapidly within the symbol duration. a. Bandwidth b. Frequency c. Impulse response d. None of the above
Last Answer : Fast fading occurs if the channel Impulse response changes rapidly within the symbol duration.
Description : As we know when there is a joint in optical fiber then there will be some loss then this loss be minimized by a. Using index matching fluid in the gap b. Making V-grooved splicing c. Both (a)and (b) d. Making carefully polishing
Last Answer : As we know when there is a joint in optical fiber then there will be some loss then this loss be minimized by Using index matching fluid in the gap
Description : What type of radio waves ?
Last Answer : Radio waves are a type of electromagnetic waves.
Description : Which type of radiations are absorbed by the upper layer of the atmosphere? (1) Radio-waves (2) Infrared (3) Visible (4) Ultraviolet
Last Answer : (4) Ultraviolet Explanation: The Troposphere is the layer where the weather happens. Above this layer is the Stratosphere and in between them is the Ozone layer that absorbs the sun's ... . Above the Stratosphere is the Mesosphere, the Thermosphere including the Ionosphere - and the Exosphere.
Description : Type of emission produced by one of the early radio transmitter in trains of damped RF ac waves where its oscillator is coupled to a long wire antenna, normally used in radio telegraph and having sidebands on its carrier. A. Digital emission B. Key emission C. Cycle emission D. Spark emission
Last Answer : D. Spark emission
Description : Which type of radiations are absorbed by the upper layer of the atmosphere? (1) Radio-waves (2)Infrared (3) Visible (4) Ultraviolet
Last Answer : Ultraviolet
Description : The principle used in radar is the same as that of Sonar. In radar we use radio waves ; whereas in sonar we use ? A. red waves B. Infrared waves C. Ultrasonic (Answer) D. super sonic E. None of these
Last Answer : C. Ultrasonic (Answer)
Description : Which radio frequency bands use the tropospheric scattering principle for propagation of radio waves?
Last Answer : Vhf and above
Description : Has anyone ever actually picked up radio waves in their mouth?
Last Answer : It happened on Gilligan’s Island once.
Description : The absorption of radio waves by the atmosphere depends on which thing? -General Knowledge
Last Answer : The answer is 'Their frequency'
Description : By which Radio waves of constant amplitude can be generated? -General Knowledge
Last Answer : The answer is 'Oscillator'
Description : Which atmospheric layer that reflects radio waves is called? -General Knowledge
Last Answer : The answer is 'Ionosphere'
Description : Long distance short-wave radio broad casting uses which waves? -Do You Know?
Last Answer : answer:
Last Answer : Ionosphere Ionosphere reflects radio waves from the earth thus, helping radio communication.
Last Answer : frequency The absorption of radio waves by the atmosphere depends on their frequency.
Description : What are water waves , light waves , heat waves , radio waves, etc. ?
Last Answer : Transverse waves like water waves , light waves , heat waves , radio waves etc.
Description : Which layer of the atmosphere reflects radio waves ?
Last Answer : : Radio waves are reflected from the ionic layer of the atmosphere.
Description : How many types of radio waves ?
Last Answer : 2 types of radio waves.
Description : What is another name for radio waves ?
Last Answer : Another name for radio waves is modulated waves
Description : What does Sending out a pulse of high frequency radio waves?
Last Answer : Need answer
Description : What Palindromes for Sending out a pulse of high frequency radio waves?
Last Answer : radar
Description : Is the same for radio waves and gamma rays traveling in space?
Description : What Infrared rays are electromagnet waves that are longer than radio waves but shorter than visible light rays true of false?
Description : How does a television signal differ from a standard radio waves?
Last Answer : it operates at a much higher diffrence
Description : Which is faster gamma waves or radio waves?
Last Answer : Both are forms of electromagnetic energy and travel at the samespeed, which is the speed of light.
Description : What is a neutron star which a Emits radiation that reaches the earth as radio waves and flashes of visible light?
Last Answer : pulsar
Description : radio waves heading upward from earth often bounce off the ____.?
Last Answer : ionosphere
Description : How are radio waves used in medical field?
Last Answer : In magnetic resonance imaging (MRI), radio waves are used together with strong magnetic fields. Ultrasound, sometimes known as sonography, is used to view soft tissues such as muscles, ... blood flow especially in real-time, while MRI delivers excellent soft tissue contrast with high resolution
Description : Radar transmits short pulses of high frequency called A. Infrared waves B. Radio waves C. Ultraviolet waves D. Sound waves
Last Answer : ANSWER: B
Description : For sending sound waves at large distance, which waves are used? A. Infrared waves B. Radio waves C. Light waves D. X-waves