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MCQs on Dielectric Constants | Dipole moment | Polarization | Part 2





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

This questions and answers may helps in you competitive exams, placements and all university online exams

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





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