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  • Question

  • Debye temperature of metals is


  • Options
  • A. about 10 K
  • B. about 200 K
  • C. about 600 K
  • D. about 2 K

  • Correct Answer
  • about 200 K 

    • Materials and Components problems

    Search Results

    • 1. Piezoelectricity means the slight change in dimensions of a specimen when an electric field is applied.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. On the basis of the type of chemical bonds, solids may be classified into

    • Options
    • A. ionic crystals
    • B. ionic and valence crystals
    • C. ionic crystal, valence crystals and metals
    • D. ionic crystals, valence crystals, metal and vander wall crystals
      • Discuss
    • 3. Assertion (A): Electronic polarizability increases as atoms becomes larger.

      Reason (R): For rare gas, ?0(?r - 1) E = Nae, where N is number of atoms/m3 and ae is electronic polarizability of 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
    • 4. The v-i relation for an arc is v = 44 + . If v = 50 V, i =

    • Options
    • A. 10 A
    • B. 5 A
    • C. 2 A
    • D. 0.5 A
      • Discuss
    • 5. A characteristic property of crystal is its periodicity of structure.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. A leakage capacitor can be represented by a capacitance C and resistance R in parallel C.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. A wire is carrying current I. The field intensity H at a distance r from the wire

    • Options
    • A. is directed towards wire
    • B. is directed away from wire
    • C. is tangential every where to a circle of radius r
    • D. none of the above
      • Discuss
    • 8. The materials which become polarized on the application of mechanical stress are called piezoelectric.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. If t is relaxation time and tc is average time between collisions, then in an isotropic metal

    • Options
    • A. t = tc
    • B. t < tc
    • C. tc < t
    • D. T = 0.01 te
      • Discuss
    • 10. Assertion (A): Resistivity of a perfect single crystal of a metal goes to zero as T approaches zero.

      Reason (R): Scattering of electrons is due to deviations from perfect periodicity of 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

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