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Materials and Components problems

  • 1. 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
  • 2. 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
  • 3. 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
  • 4. 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
  • 5. Tesla is a unit of

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