Discussion
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- Question
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
- Correct Answer
- Both A and R are true and R is correct explanation of A
- 1. 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- both due to electrons and holes with electrons as majority carriers
- sum of hole and electron currents
- difference between electron and hole currents.
Options- A. 1 only
- B. 1 and 2
- C. 2 only
- D. 3 only Discuss
- 2. Assertion (A): In many materials, dielectric polarization causes mechanical distortion.
Reason (R): If dielectric polarization causes mechanical distortion then mechanical distortion must cause dielectric polarization.
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 Discuss
- 3. In carbon resistor colour code, the third band is red. It indicates
Options- A. two zeros
- B. three zeros
- C. multiplier is 0.01
- D. multiplier is 0.1 Discuss
- 4. Dielectric constant of transformer oil is about
Options- A. 1
- B. 4
- C. 10
- D. 20 Discuss
- 5. Silicon and germanium atoms combine orderly into array of atoms located in repetitive geometric pattern. This pattern is called
Options- A. crystal
- B. covalent bond
- C. molecule
- D. valence bond Discuss
- 6. The magnetic moment in units of Bohr magneton of a ferrous ion in any ferrite is
Options- A. zero
- B. 2
- C. 4
- D. 6 Discuss
- 7. 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, Pi = 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 Discuss
- 8. In a homogeneous magnetic field H of a solenoid, the core carries a magnetic dipole moment M per unit volume equal to
Options- A. ?0 H
- B. ?r H
- C. (?r - 1) H
- D. ?o?r H Discuss
- 9. In molecules of ionic crystals, orientation polarization is zero.
Options- A. True
- B. False Discuss
- 10. Rochelle salt is a ferroelectric material.
Options- A. True
- B. False Discuss
Materials and Components problems
Search Results
Correct Answer: 1 and 2
Explanation:
The net current is sum of currents due to holes and electrons.
In n type materials, electrons are majority carriers.
Correct Answer: A is true but R is false
Correct Answer: two zeros
Correct Answer: 4
Correct Answer: crystal
Correct Answer: 4
Correct Answer: Both A and R are true and R is correct explanation of A
Correct Answer: (?r - 1) H
Correct Answer: True
Correct Answer: True
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