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

  • Tesla is a unit of


  • Options
  • A. flux
  • B. field strength
  • C. flux density
  • D. MMF

  • Correct Answer
  • flux density 

    • Materials and Components problems

    Search Results

    • 1. The colour code on a carbon resistor is brown-black-red-gold. The value of resistance is

    • Options
    • A. 100 ?
    • B. 1000 ?
    • C. 1000 ? ± 5%
    • D. 1000 ? ± 10%
      • Discuss
    • 2. In the wave mechanical theory, the maximum of the charge distribution in the ground state occurs for a distance from the nucleus equal to

    • Options
    • A. first Bohr radius
    • B. second Bohr radius
    • C. third Bohr radius
    • D. either first or second Bohr radius
      • Discuss
    • 3. Assertion (A): Acceptor extrinsic semiconductor has higher conductivity than intrinsic semiconductor.

      Reason (R): Addition of p-type impurity produces an allowable discrete energy level just above valence band.


    • 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. n type semiconductors

    • Options
    • A. are negatively charged
    • B. are produced when indium as impurity is added to germanium
    • C. are produced phosphorus as impurity is added to silicon
    • D. none of the above
      • Discuss
    • 5. ?0 has no other physical meaning than that of a fundamental conversion factor.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. The number of protons in germanium atom is

    • Options
    • A. 4
    • B. 16
    • C. 28
    • D. 32
      • Discuss
    • 7. A magnet does not attract

    • Options
    • A. nickel
    • B. iron
    • C. copper
    • D. iron and copper
      • Discuss
    • 8. At 0 K, silicon and germanium behave like monoatomic crystals.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. Two coaxial metallic cylinders have radii R1 and R2. The space between them is filled with a dielectric having dielectric constant ?r. The capacitance per metre length is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 10. Hysteresis curve is associated with motion of domain walls.

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

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