Superconductivity is observed for____________?

Related Mcqs:

1. The superconductivity is due to____________?

   A. the crystal structure having no atomic vibration at 0°K B. all electrons interact in the super-conducting state C. the electrons jump into nucleus at 0°K D. none of the above...

2. 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...

3. 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...

4. The structure sensitive property of a super conductor is______________?

   A. critical magnetic field B. transition temperature C. critical current density D. none of the above...

5. _________ is an example of piezoelectric material?

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

6. 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...

7. Carbon resistors are used extensively because they are____________?

   A. easy to make B. compact C. inexpensive D. all of the above reasons...

8. Low resistivity materials are used in__________?

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

9. 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)...

10. The conductivity of an extrinsic semiconductor with temperature________________?

    A. decreases B. increases C. remains constant...