Discussion
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- Question
For magnetic shielding, we need a ferromagnetic material.
Options- A. True
- B. False
- Correct Answer
- True
- 1. Above a certain temperature, the specific heat of a metal becomes constant. This temperature is called
Options- A. Debye temperature
- B. Curie temperature
- C. Neel temperature
- D. Transition temperature Discuss
- 2. Schrodinger wave equation is a
Options- A. linear equation
- B. differential equation
- C. partial differential equation
- D. none of the above Discuss
- 3. In solid insulator materials having only one kind of atom, the types of polarization which exist are
Options- A. electronic only
- B. electronic and ionic
- C. electronic, ionic and permanent
- D. electronic and permanent Discuss
- 4. Assertion (A): The angular momentum of an atom is due to three contributions viz. orbital, electron spin and nuclear spin.
Reason (R): The nuclear spin magnetic moment is much more than electron spin magnetic moment.
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
- 5. For making a capacitor it is better to have a dielectric having
Options- A. high permittivity
- B. low permittivity
- C. permittivity same as that of air
- D. permittivity which is neither high nor low Discuss
- 6. At room temperature the number of conducting electrons in an intrinsic semiconductor
Options- A. is almost equal to the number of valence electrons
- B. is about half the number of valence electrons
- C. is small as compared to the number of valence electrons
- D. is a very small fraction of the number of valence electrons Discuss
- 7. As the viscosity of a liquid increases, the relaxation time
Options- A. remains constant
- B. increases
- C. decreases
- D. first decreases then increases Discuss
- 8. If Bmax is the maximum flux density, eddy current loss is proportional to
Options- A. Bmax
- B. B1.6max
- C. B2max
- D. B3max Discuss
- 9. As per temperature limits, the number of categories of solid dielectrics are
Options- A. 7
- B. 6
- C. 8
- D. 5 Discuss
- 10. If the radius of electron cloud around the nucleus of a rare gas atom is R, the electronic polarizability of the atom is porportional to
Options- A. R
- B. R2
- C. R3
- D.
Discuss
Materials and Components problems
Search Results
Correct Answer: Debye temperature
Correct Answer: partial differential equation
Correct Answer: electronic only
Explanation:
In elemental dielectrics only electronic polarization exists.
Correct Answer: A is true but R is false
Explanation:
Nuclear spin is of the same order as electron sum.
Correct Answer: high permittivity
Explanation:
Capacitance is directly proportional to permittivity.
Correct Answer: is a very small fraction of the number of valence electrons
Correct Answer: increases
Explanation:
Relaxation time increases with viscosity.
Correct Answer: Bmax
Correct Answer: 7
Correct Answer: R3
Explanation:
Since (?r - 1) = 4p NR3, electronic polarizability ? R3.
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