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- Question
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
- Correct Answer
- high permittivity
ExplanationCapacitance is directly proportional to permittivity.
Materials and Components problems
Search Results
- 1. Assertion (A): If an electron having charge e is revolving in an orbit of radius R and with angular velocity ?, the magnetic dipole moment of orbit is 0.5 e?R2.
Reason (R): Orbital angular momentum and magnetic dipole moment are always equal.
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
Correct Answer: A is true but R is false
Explanation:
Orbital angular momentum and magnetic dipole moment are not equal.- 2. Bitter powder patterns prove the existence of domains.
Options- A. True
- B. False Discuss
Correct Answer: True
- 3. For dielectrics in alternating field, polarizability ae is a complex quantity. The imaginary part of ae is zero for
Options- A. ? = 0
- B. ? ? ?
- C. ? = 0 and ? ? ?
- D. ? = natural frequency ?0 Discuss
Correct Answer: ? = 0 and ? ? ?
Explanation:
Imaginary part of ae is zero for ? = 0 and ? = ?.- 4. When a trivalent impurity is added, the semiconductor becomes
Options- A. p type
- B. n type
- C. intrinsic
- D. neutral Discuss
Correct Answer: p type
- 5. When two conductors carry currents in the same direction the force is repulsive.
Options- A. True
- B. False Discuss
Correct Answer: False
Explanation:
The force is attractive.- 6. 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
Correct Answer: A is true but R is false
Explanation:
Nuclear spin is of the same order as electron sum.- 7. 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
Correct Answer: electronic only
Explanation:
In elemental dielectrics only electronic polarization exists.- 8. Schrodinger wave equation is a
Options- A. linear equation
- B. differential equation
- C. partial differential equation
- D. none of the above Discuss
Correct Answer: partial differential equation
- 9. 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
Correct Answer: Debye temperature
- 10. For magnetic shielding, we need a ferromagnetic material.
Options- A. True
- B. False Discuss
Correct Answer: True
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- 1. Assertion (A): If an electron having charge e is revolving in an orbit of radius R and with angular velocity ?, the magnetic dipole moment of orbit is 0.5 e?R2.