When a pentavalent impurity is added to a pure semiconductor, it becomes________________?

Related Mcqs:

1. The impurity level in an extrinsic semiconductor is about_______________of pure semiconductor ?

   A. 10 atoms for 108 atoms
   B. 1 atom for 108 atoms
   C. 1 atom for 104 atoms
   D. 1 atom for 100 atoms

2. Addition of pentavalent impurity to a semiconductor creates many________________?

   A. Free electrons
   B. Holes
   C. Valence electrons
   D. Bound electrons

3. A pentavalent impurity has______________Valence electrons?

   A. 3
   B. 5
   C. 4
   D. 6

4. Addition of trivalent impurity to a semiconductor creates many_______________?

   A. Holes
   B. Free electrons
   C. Valence electrons
   D. Bound electrons

5. When a pure semiconductor is heated, its resistance_________________?

   A. Goes up
   B. Goes down
   C. Remains the same
   D. Can’t say

6. As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor_______________?

   A. Remains the same
   B. Increases
   C. Decreases
   D. None of the above

7. Specific energy consumption becomes________________?

   A. more on steeper gradient
   B. more with high train resistance
   C. less if distance between stops is more
   D. all of the above

8. A trivalent impurity has______________valence electrons?

   A. 4
   B. 5
   C. 6
   D. 3

9. At room temperature, an intrinsic semiconductor has_______________?

   A. Many holes only
   B. A few free electrons and holes
   C. Many free electrons only
   D. No holes or free electrons

10. In an intrinsic semiconductor, the number of free electrons_____________?

    A. Equals the number of holes
    B. Is greater than the number of holes
    C. Is less than the number of holes
    D. None of the above