Discussion
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- Question
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
- Correct Answer
- x << R
- 1. 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
- 2. 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
- 3. 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
- 4. The direction of force an a conductor carrying current and lying in a magnetic field can be found by using
Options- A. Fleming's left hand rule
- B. Fleming's right hand rule
- C. Cork screw rule
- D. Any of the above Discuss
- 5. Assertion (A): In some materials, ?r is independent of temperature while in others, ?r depends on temperature.
Reason (R): If permanent dipoles are absent, ?r varies with temperature.
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
- 6. The units for electric dipole moment are
Options- A. coulombs
- B. colomb-metre
- C. coulomb/metre
- D. coulomb/m2 Discuss
- 7. For a superconductor, the relative permeability is
Options- A. zero
- B. high
- C. low
- D. either low or high Discuss
- 8. 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
- 9. 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
- 10. 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
Materials and Components problems
Search Results
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: Fleming's left hand rule
Correct Answer: A is true but R is false
Correct Answer: colomb-metre
Explanation:
It is product of charge and distance.
Correct Answer: zero
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
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