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WorksheetsWireless Communication
Total questions: 20
Worksheet time: 20mins
The ratio of the amplitude of the magnetic field to the amplitude of the electric field for electromagnetic wave propagation in a vacuum is equal to
Unity
Speed of light in vacuum
Reciprocal of the speed of light in vacuum
The ratio of magnetic permeability to electrical susceptibility in a vacuum.
Which properties amount the following is false about electromagnetic waves?
The energy in an electromagnetic wave is divided equally between electric and magnetic vectors.
Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of the wave.
These waves do not require any material medium for propagation
Both electric and magnetic field vectors attain the maxima and minima at the same place and the same time
Which property of an electromagnetic wave, depends on the medium in which it is travelling?
Velocity
Frequency
Wavelength
Time period
Electromagnetic waves are represented in which of the following format?
Longitudinal waves
Transverse waves
Sinusoidal waves
Surface waves
For increasing accuracy, high frequency of propagation is used.
TRUE
FALSE
Energy of the discrete particles can be given by
Photons
Protoplasm
Electrons
Neutrons
Which among the following is having more wavelengths?
X-rays
Cosmic waves
Radio waves
Gamma rays
Which of the following indicates the correct set of combination in radio waves?
Shorter wavelength – high frequency
Longer wavelength – less frequency
Shorter wavelength – less frequency
Longer wavelength – high frequency
EM waves varies from ______ to ________
Meters to nano-meters
Meters to micro-meters
Nano to micro-meters
Centimeters to nano-meters
The formula of energy produced from the body can be given as _________
Q = h- c / λ
Q = h*c * λ
Q = h+ c / λ
Q = h*c / λ
The source of electromagnetic waves can be a charge
moving with a constant velocity.
moving in a circular orbit
at rest.
none of these.
Who propounded electro magnetic radiation theory?
Sir Edward Appleton
James Clerk Maxwell
Christian Huygens
Sir Isaac Newton
What is the relation in degrees of the electric and magnetic fields in an electromagnetic wave?
180 degrees
90 degrees
270 degrees
45 degrees
A changing electric field gives rise to ________.
a magnetic field
sound field
electromagnetic waves
.near and far fields
In electromagnetic waves, polarization __________.
is caused by reflection
is due to the transverse nature of the waves
results from the longitudinal nature of the waves
is always vertical in an isotropic medium
The layer that reflects very low frequency waves and absorbs medium frequency waves.
D Layer
E Layer
F1 Layer
F2 Layer
What is the highest frequency that can be sent straight upward and be returned to earth?
MUF
critical frequency
skip frequency
gyro frequency
A mobile receiver experiences “dead” areas of reception as a result of
atmospheric absorption
tropospheric scatter
sporadic E
shading of the RF signal by hills and trees
A wide-bandwidth communications systems in which the RF carrier varies according to some predetermined sequence.
amplitude compandored single sideband
SITOR
spread spectrum communication
time-domain frequency modulation
Electromagnetic waves are produced by
A static charge
An accelerated charge
A moving charge
Charged particles
