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, ClausiusMossotti Equation....
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SET 1 of Dielectric Constants, Dipole moment, Polarization mcqs
Question 1. The unit of dipole moment is ____
A. coulomb.metre
B. coulomb/metre
C. coulomb.metre2
D. metre / coulomb
Answer - A
Marks 1
Question 2. The unit of dielectric constant is
A. farad / metre
B. unitless
C. farad . metre
D. farad . metre2
Answer - A
Marks 1
Question 3. The unit of Polarizability is
A. farad / metre2
B. farad . metre2
C. farad / metre
D. Farad . metre
Answer - B
Marks 1
Question 4. The unit of Electric Susceptibility is
A. coulomb.metre
B. coulomb/metre
C. farad.metre2
D. unit less
Answer – D
Marks 1
Question 5. The dielectric constant is --------- of the material.
A. absolute permeability
B. permittivity
C. absolute permittivity
D. permeability
Answer – B
Marks 1
Question 6. The unit of Polarization is
A. coulomb.metre2
B. coulomb/metre2
C. coulomb.metre
D. metre / coulomb
Answer - B
Marks 1
Question 7. 1 debye = ------- coulomb.metre
A. 3.33 x 10-12
B. 3.33 x 10-13
C. 3.33 x 10-3
D. 3.33 x 10-30
Answer - D
Marks 1
Question 8. The value of relative permittivity for air is
A. 1
B. 1.6
C. 1.66
D. 1.8
Answer - A
Marks 1
Question 9. The following is not the type of polarization
A. orientational
B. ionic
C. orbital
D. electronic
Answer - C
Marks 1
Question 10. The Clausius Mossotti equation is given by
A. [(3ε0)( εr -1)]= [(Nαe)(εr+2)]
B. [(Nαe)(εr+2)] =[(3ε0)( εr+1)]
C. [(3ε0)( εr -1)]= [(Nαe)(εr -2)]
D. [(3ε0)( εr+1)]= [(Nαe)(εr-2)]
Answer - A
Marks 1
SET 2 of Dielectric Constants, Dipole moment, Polarization mcqs
Question 11. The value for Boltzmann’s Constant is
A. 1.38 x 10-20 J/ 0K
B. 1.38 x 10-23 J/ 0K
C. 1.38 x 10-13 J/ 0K
D. 1.38 x 10-3 J/ 0K
Answer - B
Marks 1
Question 12. The value of relative dielectric constant for air is
A. 1.61
B. 1.61
C. 1.6
D. 1
Answer - D
Marks 1
Question 13. [(3ε0)( εr -1)]= [(Nαe)(εr+2)] , is known as
A. Clausius Mossotti equation
B. Debye equation
C. Curie Weiss equation
D. Clausius equation
Answer - A
Marks 1
Question 14. The value of dielectric constant for air 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. 1
Answer - B
Marks 1
Question 15. For a parallel plate capacitor, if the value of capacitance is 5μF, applied voltage is 2000V; then energy stored in a capacitor is
A. 10 J
B. 100 J
C. 10 W
D. 100 W
Answer - A
Marks 1
Question 16. The Polarizability means
A. dipole moment .volume
B. volume /dipole moment
C. dipole moment / electric field intensity
D. dipole moment . volume2
Answer - C
Marks 1
Question 17. The dipole moment is ------ quantity and its direction points from --------.
A. scalar, positive to negative
B. vector, positive to negative
C. scalar, negative to positive
D. vector, negative to positive
Answer - D
Marks 1
Question 18. The clausius Mossotti equation is applicable for
A. solid dielectrics
B. liquid dielectrics
C. gaseous dielectrics
D. none of these
Answer - A
Marks 1
Question 19. The dielectric constant is
A. dielectric strength / volume
B. dielectric field density / electric field intensity
C. dielectric field density x electric field intensity
D. electric field intensity /dielectric strength
Answer - B
Marks 1
Question 20. Induced and dipolar polarization are alternate names for ------- respectively.
A. electronic, orientational
B. electronic, ionic
C. orientational, electronic
D. ionic, orientational
Answer - A
Marks 1
SET 3 of Dielectric Constants, Dipole moment, Polarization mcqs
Question 21. The inverse of electrostriction effect is
A. magneto - electrostriction
B. piezoelectric effect
C. magnetostriction
D. none of these
Answer - B
Marks 1
Question 22. The assumption for Clausius Mossotti equation is
A. molecule polarizability is isotropic
B. molecule polarizability is anisotropic
C. molecule arrangement is anisotropic
D. none of these
Answer - A
Marks 1
Question 23. The insulation resistance can be measured by using
A. CRO
B. megger
C. LCR meter
D. multimeter
Answer - B
Marks 1
Question 24. The technology used for PV cell fabrication is
A. amorphous silicon
B. poly- crystaline
C. mono- crystaline
D. All of these
Answer - D
Marks 1
Question 25. If relative permittivity of argon atom is 1.0024 at NTP & N = 2.8 x1026 atoms /m3.Then electronic polarizability of argon atom will be
A. 7.58 x 10 -41 F.m2
B. 7.58 x 10 -40 F.m2
C. 7.58 x 10 -4 F.m2
D. 7.58 x 10 -14 F.m2
Answer - A
Marks 1
Question 26. The assumption for Clausius Mossotti equation is
A. molecule polarizability is isotropic
B. short range interactions are absent
C. molecule arrangement is isotropic
D. all of these
Answer - D
Marks 1
Question 27. The dielectric loss is given by
A. P = 2πfCV2tanδ
B. P = 2πf2CVtanδ
C. P = 2πfC2V2tanδ
D. P = 2πfC2Vtanδ
Answer - A
Marks 1
Question 28. The dielectric loss tangent is dependent on
A. frequency
B. applied voltage
C. value of capacitance
D. all of these
Answer - D
Marks 1
Question 29. PV cells are used in ____
A. automatic control systems
B. solar power generation
C. television circuit
D. all of the above
Answer - D
Marks 1
Question 30. Which of the following is correct?
A. P = N.pm
B. P = ε0(εr-1)E
C. P = ε0χeE
D. all of the above
Answer - D
Marks 1
