MCQs on Dielectric Constants, Dipole moment, Polarization in Material Science | Part 4
This sets of objective questions or MCQs more focuses on Dielectric Constants, Dipole moment, Polarization, Polarizability, permittivity of part 4....
Click here to read part 1 of Dielectric Constants, Dipole moment, Polarization
Click here to read part 2 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 | Part 4
Question 1.The dielectric loss is affected by
A. presence of humidity
B. voltage and temperature increase
C. frequency of applied voltage
D. all of the above
Answer D
Marks 1
Question 2.All piezo-electric materials are ___________ .
A. dielectric materials
B. ferroelectric materials
C. ferrielectric materials
D. none
Answer B
Marks 1
Question 3.If relative permittivity of argon atom is 1.0024 at NTP & N = 2.3 x1025 atoms / m3 .Then electronic polarizability of argon atom will be
A. 92.38 x 10 -40 F.m2
B. 923.8 x 10 -40 F.m2
C. 9.238 x 10 -40 F.m2
D. 9238 x 10 -40 F.m2
Answer C
Marks 1
Question 4. Which of the following statements is not valid for relative permittivity ?
A. It is dimensionless
B. Its value for all substances is more than one
C. It is not equal to unity for vacuum
D. None of these
Answer C
Marks 1
Question 5.Which of the following term is not valid for dielectric materials?
A. dielectric constant
B. permittivity
C. polarization
D. permeability
Answer D
Marks 1
Question 6.What causes the piezoelectric effect ?
A. Heat or dissimilar metals
B. Pressure on a crystal
C. Magnetic field
D. Water running on iron
Answer B
Marks 1
Question 7.Dielectric constants of liquid dielectrics are ________ gaseous dielectrics.
A. smaller than
B. larger than
C. equal to
D. none of these
Answer A
Marks 1
Question 8.Which of the following term is valid for dielectric materials ?
A. Dielectric constant
B. permittivity
C. polarization
D. all of these
Answer D
Marks 1
Question 9.For a parallel plate capacitor, if the value of capacitance is 4μF, applied voltage is 1kV;
then energy stored in a capacitor is
A. 20 J
B. 2 J
C. 0.2 J
D. 200 J
Answer B
Marks 1
Question 10. Dielectric constants of liquid dielectrics are ________ solid dielectrics.
A. smaller than
B. larger than
C. equal to
D. none of these
Answer B
Marks 1
SET 2 of Dielectric Constants, Dipole moment, Polarization mcqs | Part 4
Question 11.A lossy dielectric’s equivalent circuit can be represented by
A. capacitance only
B. pure capacitance in series with inductance
C. pure capacitance in parallel with resistance
D. None of the above
Answer C
Marks 1
Question 12. Materials having low dielectric constant are used in
A. permanent magnet
B. lasers
C. PCBs
D. microwave applications
Answer D
Marks 1
Question 13.In ferroelectric material, hysteresis loop is a __________ function of applied electric field.
A. non- linear
B. linear
C. parabolic
D. exponential
Answer A
Marks 1
Question 14.In piezoelectric material, ______ energy is converted into electrical energy.
A. solar
B. mechanical
C. heat
D. chemical
Answer B
Marks 1
Question 15.In orientational polarization, rotation of the permanent dipole moments is ______ direction of the applied field.
A. in opposite
B. in the
C. in parallel with the
D. none
Answer B
Marks 1
Question 16. If the applied voltage is 1000V & thickness of the dielectric is 0.05m; then the electric field intensity is
A. 200 kV / m
B. 2 kV / m
C. 20 kV / m
D. 0.20 kV / m
Answer C
Marks 1
Question 17.Dielectric constants of solid dielectrics are ________ gaseous dielectrics.
A. smaller than
B. larger than
C. equal to
D. none of these
Answer A
Marks 1
Question 18.The orientational polarization ________ with increasing temperature.
A. increases
B. decreases
C. is constant
D. None of these
Answer B
Marks 1
Question 19.In electrostriction, when an electric field is applied, polarization may change the _________ of the material.
A. resistance
B. temperature coefficient
C. dimensions
D. resistivity
Answer C
Marks 1
Question 20.One among the following is an example of ferroelectric compound.
A. Quartz
B. Barium titanate
C. Lead chromate
D. Tournaline
Answer B
Marks 1
SET 1 of Dielectric Constants, Dipole moment, Polarization mcqs | Part 4
Question 21. Which is an example of ferroelectric material?
A. Lead titanate
B. Lead zireonate
C. Potassium niobate
D. Quartz
Answer C
Marks 1
Question 22.If the applied voltage is 2000V & thickness of the dielectric is 0.04m; then the electric field intensity is
A. 50 V / m
B. 500 kV / m
C. 5 kV / m
D. 50 kV / m
Answer D
Marks 1
Question 23. In ferroelectric material, the spontaneous polarization vanishes above -----.
A. Transition temperature
B. debye temperature
C. Curie temperature
D. Fermi temperature
Answer C
Marks 1
Question 24.For material to be good dielectric, what are the two most important properties?
A. High dielectric strength and low insulation resistance
B. Low dielectric strength and high insulation resistance
C. High dielectric strength and high insulation resistance
D. Low dielectric strength and low insulation resistance.
Answer C
M.arks 1
Question 25.Ferroelectric materials are characterized by
A. a sharp dependence of polarization on temperature
B. very high degree of polarization
C. non-linear dependence of the charge Q on the applied voltage
D. all the above
Answer D
Marks 1
Question 26.In case of polar dielectrics, dipole moments are present ------.
A. in absence of external magnetic field
B. in presence of external magnetic field
C. in absence of external heat
D. none
Answer A
Marks 1
Question 27.Dipolar polarization sets in _____ second.
A. less than 10-10
B. more than 10–10
C. less than 10 -9
D. None
Answer B
Marks 1
Question 29.Ionic polarization exists for the materials with
A. Net positive charge
B. Net negative charge
C. Both A & B
D. Don't have any charge
Answer C
Marks 1
Question 30.Dielectrics have ----- free electrons.
A. very few
B. many
C. no
D. none of these
Answer C
Marks 1
Click here to read part 1 of Dielectric Constants, Dipole moment, Polarization
Click here to read part 2 of Dielectric Constants, Dipole moment, Polarization
Click here to read part 3 of Dielectric Constants, Dipole moment, Polarization
