is an element used in semiconductors whose atoms have three valence electrons?

Related Mcqs:

1. The conduction of electricity, in semiconductors, takes place due to movement of______________?

   A. positive ions only B. negative ions only C. positive and negative ions D. electrons and holes...

2. The current due to electron flow in conduction band is the hole current in valence band?

   A. equal to B. less than C. greater than D. any of the above...

3. The formula __________ determines the number of electrons that can be accommodated in any level?

   A. 2n2 B. 4n2 C. 2n3 D. 4ns...

4. The conductors have transport phenomena of electrons due to____________?

   A. electric field B. magnetic field C. electromagnetic field D. none of the above...

5. The tiny block formed by the arrangement of a small group of atoms is called the____________?

   A. unit cell B. space lattice C. either A. or (b) D. none of the above...

6. The number of atoms per unit cell in B.C.C. structure is_____________?

   A. 1 B. 2 C. 4 D. 8...

7. The impurity atoms is semiconductors_____________?

   A. inject more charge carriers B. reduce the energy gap C. increase the kinetic energy of valence electrons D. all of the above...

8. Substances whose specific resistance abruptly decreases at very low temperature are called___________?

   A. insulators B. conductors C. semiconductors D. superconductors...

9. Superconductors are becoming popular for use in________________?

   A. generating very strong magnetic field B. manufacture of bubble memories C. generating electrostatic field D. generating regions free from magnetic field...

10. Addition of 0.3 to 4.5% silicon to iron ________ the electrical resistivity of iron?

    A. increases B. decreases C. does not change...