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WorksheetsUnit1_MS
Total questions: 20
Worksheet time: 11mins
The unit of dipole moment is
coulomb.metre
coulomb/metre
coulomb.metre2
metre / coulomb
The unit of dielectric constant of a material is
farad / metre
unitless
farad . metre
farad . metre2
The unit of Polarizability is
farad / metre2
farad . metre2
farad / metre
Farad . metre
The unit of Electric Susceptibility is
coulomb.metre
coulomb/metre
farad.metre2
unitless
The following is not the type of polarization
orientational
ionic
orbital
electronic
The assumption for Clausius Mossotti equation is
molecule polarizability is isotropic
molecule polarizability is anisotropic
molecule arrangement is anisotropic
none of these
The dielectric loss is given by
P = 2πfCV2tanδ
P = 2πf2CVtanδ
P = 2πfC2V2tanδ
P = 2πfC2Vtanδ
The dielectric loss tangent is dependent on
frequency
applied voltage
value of capacitance
all of these
When the external field is applied, the bound electrons of an atom are displaced in a way that centroid of electronic cloud is separated from centroid of nucleus. The
atom is polarized this phenomena is called
Electronic Polarization
Ionic Polarization
Orientational Polarization
Molecular Polarization
A lossy dielectric equivalent circuit can be represented by
Capacitance in series with resistance
Only by capacitance
Capacitance in parallel with resistance
Capacitance in series and parallel with resistance
Spontaneous polarization vanishes above a certain temperature called as
Absolute temperature
Curie temperature
Transition temperature
Critical temperature
In case of polar dielectrics, dipole moment are present
In present of external magnetic field
In absence of external magnetic field
In present of external electric field
In absence of external electric field
In case of dielectric and insulating material following is true……
All dielectric materials are insulators
All insulating materials are dielectric materials
Some dielectric materials are insulators
All dielectric materials are not insulators
Which of the following is correct?
P = N.p
P = ε0(εr-1)E
P = ε0χeE
all the above
Two charges equal in magnitude but opposite in polarity and separated by distance(d) constitute a ______
dipole
polarization
dielectric constant
None of these
When sodium crystal is subjected to an electric field of 1000 V/m and the resultant
polarizationis4.3x10-8c/m2;thentherelativepermittivityofsodiumcrystalis
586
5.86
0.586
58.6
In piezoelectric materials, energy is converted into electrical energy.
solar
mechanical
heat
chemical
Piezoelectricity : mechanical force ; pyroelectricity : ?
temperature
light intensity
pressure
Spontaneous polarization
Pyroelectricity : Infrared detectors ; Piezoelectricity :?
Ultrasound waves
Strain gauges
Memory devices
capacitors
The dielectric loss does not vary with
applied voltage
frequency
capacitance
inductance
