Discussion
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- Question
For a superconductor, the relative permeability is
Options- A. zero
- B. high
- C. low
- D. either low or high
- Correct Answer
- zero
- 1. The units for electric dipole moment are
Options- A. coulombs
- B. colomb-metre
- C. coulomb/metre
- D. coulomb/m2 Discuss
- 2. When the atom of rare gas is placed in an electric field the nucleus shifts from the centre of electron cloud by an amount x. If the radius of electron cloud is R, then
Options- A. x << R
- B. x ≂ 0.5 R
- C. x ? 0.75 R
- D. x ? R Discuss
- 3. In anti-ferromagnetic materials, the graph of susceptibility versus temperature shows a sharp maximum at a certain temperature. This temperature is known as
Options- A. Curie temperature
- B. Neel temperature
- C. Weiss temperature
- D. Bitter temperature Discuss
- 4. A single layer air cored coil has n turns and inductance L. If a new coil is formed by having 2n turns while keeping the coil length and diameter the same, the new inductance is
Options- A. 0.5 L
- B. L
- C. 2 L
- D. 4 L Discuss
- 5. The real part of complex dielectric constant and tan? for a dielectric are 2.1 and 5 x 10-4 at 100 Hz respectively. The imaginary part of dielectric constant at 100 Hz is
Options- A. 1.05 x 10-3
- B. 2.1 x 10-3
- C. 5 x 10-3
- D. 1.05 x 10-2 Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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 Discuss
- 10. Diamagnetic materials do not have permanent magnetic dipoles.
Options- A. True
- B. False Discuss
Materials and Components problems
Search Results
Correct Answer: colomb-metre
Explanation:
It is product of charge and distance.
Correct Answer: x << R
Correct Answer: Neel temperature
Correct Answer: 4 L
Explanation:
Inductance is proportional to square of number of turns.
Correct Answer: 1.05 x 10-3
Explanation:
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: 1.43 eV
Correct Answer: A is true but R is false
Correct Answer: nucleus and inner orbits
Correct Answer: True
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