Objective questions on Dielectric Constants, Dipole moment, Polarization in Material Science
This sets of objective questions or MCQs more focuses on Dielectric Constants, Dipole moment, Polarization, Polarizability, permittivity....
Click here to read part 1 of Dielectric Constants, Dipole moment, Polarization
Click here to read part 3 of Dielectric Constants, Dipole moment, Polarization
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SET 1 of Dielectric Constants, Dipole moment, Polarization mcqs
Question 1. The value of tanδ is negative for ----- circuits.
A resistive - capacitive
B resistive - inductive
C inductive- capacitive
D none of these
Answer C
Marks 1
Question 2. Two charges equal in magnitude but opposite in polarity and separated by distance(d)
constitute a ______________ .
A dipole
B polarization
C dielectric constant
D None of these
Answer A
Marks 1
Question 3. The dielectric loss is given by
A P = 2πfCV2 tanδ
B P = 2πf2CV / ωCR
C P = (α.E2) / 2
D All of these
Answer D
Marks 1
Question 4. The value of permittivity of free space is
A 8.854 x 10-11 F/m
B 8.854 x 10-12 F/m
C 8.854 x 10-13 F/m
D 8.854 x 10-10 F/m
Answer B
Marks 1
Question 5.In case of thermocouple materials, the voltage generated is ____
A voltage magnitude is in milivolts
B permanent in nature
C DC in nature
D all of these
Answer D
Marks 1
Question 6.When sodium crystal is subjected to an electric field of 1000 V/m and the resultant polarization is 4.3 x 10-8 c/m2 ; then the relative permittivity of sodium crystal is
A 586
B 5.86
C 0.586
D 58.6
Answer B
Marks 1
Question 7.Debye is the unit for
A polarization
B dipole moment
C dielectric constant
D None of these
Answer B
Marks 1
Question 8.Units of polarization and polarizability respectively are
A c/m2 , Fm2
B c/m2 , F/m2
C cm2 , Fm2
D cm2 , F/m2
Answer A
Marks 1
Question 9.In case of Pyro-electric materials, the voltage generated is ____
A temporary
B permanent
C AC in nature
D none of these
Answer A
Marks 1
Question 10.The materials used for Solar PV depend on _______ .
A cost or Rs / watts
B applications
C availability of space
D all of the above
Answer D
Marks 1
SET 2 of Dielectric Constants, Dipole moment, Polarization mcqs
Question 11. Dielectric constant for monoatomic gas is ____ (approx).
A 0
B 1
C 2
D 3
Answer B
Marks 1
Question 12.Dielectric loss indicates quality of____ materials.
A conducting
B dielectric
C semiconducting
D magnetic
Answer B
Marks 1
Question 13.In piezoelectric materials, _____ energy is converted into electrical energy.
A solar
B mechanical
C heat
D chemical
Answer B
Marks 1
Question 14. In orientational polarization, rotation of the permanent dipole moment is _____ the direction of the applied field.
A in the
B parallel
C opposite
D perpendicular
Answer C
Marks 1
Question 15. If the susceptibility of carbon dioxide atom is 0.974 x 10-3 at NTP & N = 2.8 x1025 atoms / m3 , then electronic polarizability of CO2 atom will be
A 3.078 x 10 -14 F.m2
B 3.078 x 10 -10 F.m2
C 3.078 x 10 -40 F.m2
D 3.078 x 10 -4F.m2
Answer C
Marks 1
Question 16.The pyro-electric materials have ____
A dipole polarization
B electronic polarization
C spontaneous polarization
D both A and D
Answer C
Marks 1
Question 17.The ----- an example of a photo emissive cell.
A Photo transistor
B Photo diode
C Photo multiplier
D LDR
Answer D
Marks 1
Question 18.For inductive winding circuits, tanδ (dielectric loss tangent) is ___ , while for capacitive circuits, it is _________.
A negative, negative
B negative , positive
C positive , negative
D positive , positive
Answer B
Marks 1
Question 19.Thin film PV cells are manufactured by ______
A Czocharlski method
B Casting process
C CVD technique
D both a and b
Answer C
Marks 1
Question 20. Piezoelectricity : quartz ; ferroelectricity : ?
A Cadmium sulphide
B PzT type of ceramic
C Sodium nitrate
D None of these
Answer C
Marks 1
SET 3 of Dielectric Constants, Dipole moment, Polarization mcqs
Question 21.The photoconductive cell consists of a thin film of _____
A Cadmium sulphide
B Lithium sulphate
C Quartz
D Barium sulphate
Answer A
Marks 1
Question 22.Ferroelectricity : barium titanate ; Piezoelectricity : ?
A Rochelle salt
B PzT type ceramic
C Sodium nitrate
D None of these
Answer A
Marks 1
Question 23.Piezoelectricity : mechanical force ; pyroelectricity : ?
A temperature
B light intensity
C pressure
D Spontaneous polarization
Answer A
Marks 1
Question 24.Piezoelectricity : gas lighters ; pyroelectricity : ?
A ultrasound waves
B Infrared detectors
C transducers
D capacitors
Answer B
Marks 1
Question 25.If a capacitor of 5 µF is applied with voltage of 50 kV at a frequency of 50Hz and its dielectric loss tangent is 0.002 ; then the dielectric loss will be
A 7853.98 W
B 785.398 J
C 785.398 W
D 78.5398 W
Answer A
Marks 1
Question 26.The ------ is the type of photoelectric cells.
A photoconductive cells
B photoemissive cells
C photovoltaic cells
D All of these
Answer D
Marks 1
Question 27.The dielectric loss tangent varies in square proportion of
A Applied voltage
B frequency
C capacitance
D All of these
Answer A
Marks 1
Question 28.Pyroelectricity : Infrared detectors ; Piezoelectricity : ?
A Ultrasound waves
B Strain gauges
C Memory devices
D capacitors
Answer B
Marks 1
Question 29.'tanδ' is known as
A Dissipation factor
B Dielectric loss tangent
C Power factor of dielectric
D All of these
Answer D
Marks 1
Question 30.Photoemissve cell : fire alarms :: photoconductive cell : ?
A photography
B calorimetry
C Automatic door opening
D None of these
Answer A
Marks 1
Click here to read part 1 of Dielectric Constants, Dipole moment, Polarization
Click here to read part 3 of Dielectric Constants, Dipole moment, Polarization
