In molecules of ionic crystals, orientation polarization is zero. True False

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Question
In molecules of ionic crystals, orientation polarization is zero.
Options
A. True
B. False

Correct Answer

True

Materials and Components problems

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2. Assertion (A): The optical dielectric constant (i.e., ?_r at optical frequencies)of ionic dielectrics is less than static dielectric constant.
Reason (R): At optical frequencies, P_i = 0.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

4. Assertion (A): ?_r can be determined experimentally by measuring the capacitance of a parallel plate capacitor with and without the dielectric.
Reason (R): Capacitance of a parallel plate capacitor = .
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

5. Consider the following statement
If an electric field is applied to an n type semiconductor bar, the electrons and holes move in opposite directions due to their opposite charges. The net currents is
1. both due to electrons and holes with electrons as majority carriers
2. sum of hole and electron currents
3. difference between electron and hole currents.
Which of above statements are correct?
Options
A. 1 only
B. 1 and 2
C. 2 only
D. 3 only

7. Ferromagnetic materials
Options
A. shows spontaneous magnetisation below a certain temperature
B. have resistivity very high as compared to that of iron
C. can be used even at microwave frequencies
D. all of the above

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