A. adding impurities
B. reducing temperatures
C. application of magnetic field
D. any of the above
Related Mcqs:
- 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 - Superconducting metal in super conducting state has relative permeability of________________?
A. zero
B. one
C. negative
D. more than one - 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 - Which of the following variety of copper has the best conductivity ?
A. Induction hardened copper
B. Hard drawn copper
C. Pure annealed copper
D. Copper containing traces of silicon - 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 - The conductivity of an extrinsic semiconductor with temperature________________?
A. decreases
B. increases
C. remains constant - The converse of hardness is known as______________?
A. malleability
B. toughness
C. softness
D. none of the above - __________ is the main constituent of glass?
A. Fe203
B. Si02
C. AI2O3
D. B2O3 - Platinum is used in_____________?
A. electrical contacts
B. thermocouple
C. heating element in high temperature furnace
D. grids of special purpose vacuum tubes
E. all of the above - 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
