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Home ‣ Electronics and Communication Engineering ‣ Materials and Components See What Others Are Saying!
  • Question

  • 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

  • Correct Answer
  • Both A and R are true but R is not correct explanation of A 

    • More questions

    • 1. Consider the following statements about instrument landing system of aircraft

      1. It ensures correct landing under conditions of low visibility.
      2. It consists of runaway localizer, glide path equipment and marker beacons.
      3. It is basically a blind landing system.
      Which of above statements are correct?

    • Options
    • A. All
    • B. 1 and 2 only
    • C. 1 and 3 only
    • D. 2 only
      • Discuss
    • 2. The specified maximum junction temperature of thyristors is about

    • Options
    • A. 50°C
    • B. 80°C
    • C. 120°C
    • D. 200°C
      • Discuss
    • 3. In figure the saturation collector current is

    • Options
    • A.
    • B.
    • C.
    • D. none of the above
      • Discuss
    • 4. The source of which of the following noise is different from that of the remaining?

    • Options
    • A. Solar noise
    • B. Cosmic noise
    • C. Galactic noise
    • D. Atmospheric noise
      • Discuss
    • 5. If peak value of input voltage is Vm and firing angle is a, the average output voltage for single phase half wave and single phase full wave regulators are

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 6. Radio broadcasting is a familiar example of

    • Options
    • A. space multiplexing
    • B. time multiplexing
    • C. frequency multiplexing
    • D. none of the above
      • Discuss
    • 7. A line has a phase constant of 29.8 rad/m. At 1000 MHz the wavelength is

    • Options
    • A. 29.8 m
    • B. 2.98 m
    • C. 2.1 m
    • D. 0.21 m
      • Discuss
    • 8. The class of insulation of impregnated paper is

    • Options
    • A. A
    • B. B
    • C. C
    • D. F
      • Discuss
    • 9. The quality of a space-link is measured in terms of the __________ ratio.

    • Options
    • A. C/N
    • B. S/N
    • C. G/T
    • D. EIRP
      • Discuss
    • 10. For a 50 ? resistor for 3 GHz application, the stray capacitance should be less than

    • Options
    • A. 1 ?F
    • B. 1 nF
    • C. 1 pF
    • D. 0.1 pF
      • Discuss

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