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

Related Mcqs:

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

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

2. 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

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

   A. An acceptor
   B. A donor
   C. Germanium
   D. Silicon

4. The covalent bond is formed by_______________?

   A. transfer of electrons between atoms
   B. sharing of electrons between atoms
   E. sharing of variable number of electrons by a variable number of atoms
   D. none of the above

5. In a superconductor the value of critical density depends upon______________?

   A. magnetic field strength
   B. temperature
   C. either (A) or (B)
   D. both (A) and (B)

6. An H.R.C. fuse is_______________?

   A. a ceramic body having metal and caps
   B. a wire of platinum
   C. a heavy cross-section of copper or aluminium
   D. a ceramic tube having carbon rod inside it

7. _________ is an example of piezoelectric material?

   A. Glass
   B. Quartz
   C. Corrundum
   D. Neoprene

8. The conductivity of a metal is determined by____________?

   A. the electronic concentration and the mobility of the free electrons
   B. the number of valence electrons per atom
   C. either (A) or (B)
   D. none of the above

9. Low resistivity materials are used in__________?

   A. transformer, motor and generator windings
   B. transmission and distribution lines
   C. house wiring
   D. all above applications

10. Surface resistance of an insulating material is reduced due to the______________?

    A. smoky and dirty atmosphere
    B. humidity in the atmosphere
    C. both (A) and (b)
    D. neither (A) nor (b)