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Home ‣ Electronics and Communication Engineering ‣ Materials and Components Comments
  • Question

  • 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

  • Correct Answer
  • Both A and R are true and R is correct explanation of A 

    Explanation
    If electrons are tightly bound, conductivity is not there.

    Materials and Components problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. The colour code on a carbon resistor is yellow-violet-orange. The value of resistance is

    • Options
    • A. 17000 ?
    • B. 27000 ?
    • C. 37000 ?
    • D. 47000 ?
      • Discuss
    • 4. A leaky dielectric has ?r = ?r' - j?r". If a field E is applied, the current component in phase with E is proportional to ?r".

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. Which of the following is used in automatic control of street lights?

    • Options
    • A. Thermistor
    • B. Photoconductor
    • C. Transistor
    • D. Varistor
      • Discuss
    • 6. In which of the following semiconductor are holes minority carriers

    • Options
    • A. extrinsic
    • B. p type
    • C. n type
    • D. intrinsic
      • Discuss
    • 7. The number of valence electrons in silicon atom is

    • Options
    • A. 4
    • B. 2
    • C. 1
    • D. zero
      • Discuss
    • 8. 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
      • Discuss
    • 9. 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
    • 10. ?r is determined by the atomic structure of the dielectric.

    • Options
    • A. True
    • B. False
      • Discuss

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