Discussion
Home ‣ Electronics and Communication Engineering ‣ Materials and Components Comments
- Question
The core of an atom consists of
Options- A. nucleus
- B. nucleus and all orbits
- C. nucleus and inner orbits
- D. none of the above
- Correct Answer
- nucleus and inner orbits
- 1. Assertion (A): Relative permittivity is determined by the atomic structure of the material.
Reason (R): Absolute permittivity is determined by the atomic structure of the material.
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
- 2. The wavelength of light emitted by GaAs laser is 8670 x 10-10 m. If h = 6.626 x 10-34 Js, velocity of light = 3 x 108 m/s and eV = 1.602 x 10-19 J, the energy gap in GaAs is
Options- A. 0.18 eV
- B. 0.7 eV
- C. 1.43 eV
- D. 2.39 eV Discuss
- 3. Assertion (A): Copper is a good conductor of electricity.
Reason (R): Copper has a face centred cubic lattice.
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
- 4. For a superconductor, the relative permeability is
Options- A. zero
- B. high
- C. low
- D. either low or high Discuss
- 5. The units for electric dipole moment are
Options- A. coulombs
- B. colomb-metre
- C. coulomb/metre
- D. coulomb/m2 Discuss
- 6. Diamagnetic materials do not have permanent magnetic dipoles.
Options- A. True
- B. False Discuss
- 7. Assertion (A): Rochelle salt and Barium titanate are both ferroelectric.
Reason (R): Ferroelectric materials exhibit hysteresis effect.
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. If a metal specimen has n valence electrons per m3 each having charge e and mass m and t is the relaxations time, the conductivity is
Options- A.
- B.
- C.
- D.
Discuss
- 9. Assertion (A): Intrinsic resistivity of silicon is lower than that of germanium.
Reason (R): Magnitude of free electron concentration in germanium is more than that of silicon.
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
- 10. In a conductor the current flow is due to
Options- A. holes
- B. electrons
- C. ions
- D. electrons and ions Discuss
Materials and Components problems
Search Results
Correct Answer: A is true but R is false
Correct Answer: 1.43 eV
Correct Answer: Both A and R are true but R is not correct explanation of A
Explanation:
Conductivity does not depend on lattice structure.
Correct Answer: zero
Correct Answer: colomb-metre
Explanation:
It is product of charge and distance.
Correct Answer: True
Correct Answer: Both A and R are true but R is not correct explanation of A
Explanation:
Both the materials exhibit ferroelectric properties. Hysteresis effect is one of the features of ferroelectric materials.
Correct Answer:
Correct Answer: A is false but R is true
Correct Answer: electrons
Comments
There are no comments.More in Electronics and Communication Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.