In a crystal, an atom vibrates at a frequency determined by_______________?

Related Mcqs:

1. Total number of crystal systems is____________?

   A. 2 B. 4 C. 7 D. 12...

2. 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...

3. The conductivity of a conductor can be increased by_______________?

   A. decreasing its temperature B. increasing its temperature C. decreasing its vibration D. increasing its vibration...

4. 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...

5. The metal having the lowest temperature coefficient of resistance is_________________?

   A. gold B. copper C. aluminium D. kanthal...

6. By increasing impurity content in the metal alloy the residual resistivity always_____________?

   A. decreases B. increases C. remains constant D. becomes temperature independent...

7. Which of the following affect greatly the resistivity of electrical conductors ?

   A. Composition B. Pressure C. Size D. Temperature...

8. Which of the following materials does not have covalent bonds ?

   A. Organic polymers B. Silicon C. Metals...

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

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

10. Superconducting metal in super conducting state has relative permeability of________________?

    A. zero B. one C. negative D. more than one...