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  • Question

  • When temperature is above ferromagnetic Curie temperature, a ferromagnetic material


  • Options
  • A. becomes a paramagnetic material
  • B. becomes a very strong ferromagnetic material
  • C. becomes diamagnetic material
  • D. none of the above

  • Correct Answer
  • becomes a paramagnetic material 

    Explanation
    Above ferromagnetic Curie temperature, ferro-magnetic material behaves as a paramagnetic material.

    Materials and Components problems

    Search Results

    • 1. The number of valence electrons in silicon atom is

    • Options
    • A. 4
    • B. 2
    • C. 1
    • D. zero
      • Discuss
    • 2. In which of the following semiconductor are holes minority carriers

    • Options
    • A. extrinsic
    • B. p type
    • C. n type
    • D. intrinsic
      • Discuss
    • 3. Assertion (A): Ionic solids, in general, have no electrical conductivity.

      Reason (R): In ionic solids, electrons are tightly bound to the nucleus.


    • 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. The relation between thermal conductivity K (W/m/°C), heat flow density Q (watt/m2) and dT/dx (°C per metre) is

    • Options
    • A. Q = K(dT/dx)
    • B. Q = - K(dT/dx)
    • C. K = Q(dT/dx)
    • D. dT/dx = - QK
      • Discuss
    • 5. An electron in a metal suffers collision and if the probability of it being scattered over an angle d? is 2p P(?) sin ? d? where P(?) is an arbitrary function of scattering angle ?, then

    • Options
    • A. 2pP(?) sin ? d? = 0
    • B. 2pP(?) sin ? d? = 2
    • C. 2pP(?) sin ? d? = -1
    • D. 2pP(?) sin ? d? = 1
      • Discuss
    • 6. The number of turns in a coil is doubled. If initial time constant is T, the new time constant is

    • Options
    • A. T
    • B. 2T
    • C. 4T
    • D.
      • Discuss
    • 7. ?r is determined by the atomic structure of the dielectric.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. When Schrodinger equation is applied to the motion of electron in the field of protons, the physically acceptable solutions for the wave function exist for quantum number which are

    • Options
    • A. 2
    • B. 3
    • C. 4
    • D. 5
      • Discuss
    • 9. If B, H and M denote flux density, field intensity and magnetisation, B = ?0 (H + M).

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. Assertion (A): An amorphous material is obtained when mobility of atoms is inhibited during solidification.

      Reason (R): Crystalline state is a natural state for most solids.


    • 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

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