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ECE :: Materials and Components

  1. A leakage capacitor can be represented by a capacitance C and resistance R in parallel C.

  2. A.
    True
    B.
    False

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  3. Electric dipole moment is expressed in debye unit.

  4. A.
    True
    B.
    False

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  5. A vacant electronic state moves in the same direction as would a positive charge carrier.

  6. A.
    True
    B.
    False

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

  8. A.
    True
    B.
    False

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  9. Many compounds also exhibit semiconducting properties.

  10. A.
    True
    B.
    False

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  11. For magnetic shielding, we need a ferromagnetic material.

  12. A.
    True
    B.
    False

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  13. 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.

  14. 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

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  15. In a metal, the valence electrons

  16. A.
    are not shared
    B.
    are shared only between neighbouring atoms
    C.
    are shared by all atoms
    D.
    either (b) or (c)

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  17. All magnetic materials exhibit the phenomenon of saturation.

  18. A.
    True
    B.
    False

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  19. In p type semiconductor, the conductivity due to holes is (e = charge on hole, μp = hole mobility, p = hole concentration)

  20. A.
    B.
    C.
    peμp
    D.

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