Diode - Diode objective questions and answers


41. The donor impurity must have only.........valence electrons


   A.Two

   B.Three

   C.Four

   D.Five


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D.Five

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42. An electron in the conduction band


   A.Is always chargeless

   B.Has tendency to leave the atom

   C.Has to lower emergency than an electron in the valence band

   D.Has higher energy than an electron in the valence band


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D.Has higher energy than an electron in the valence band

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43. As the temperature co-efficient of an instrinsic semiconductor is increased


   A.Energy of the atoms is increased

   B.More holes are created in the conduction band

   C.Holes and free electrons get fused together

   D.None of the above


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A.Energy of the atoms is increased

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44. The diffusion current is proportional to


   A.Applied electric field

   B.Square of applied electric field

   C.Concentration gradient of charge carrier

   D.A constant value given by Fermi level


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C.Concentration gradient of charge carrier

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45. Atom of any element is


   A.Positively charged

   B.Negatively charged

   C.Positively or negatively charged

   D.Not charged


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D.Not charged

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