81. Match List-I with List-II and select the correct answer using the options given below:
List-I (Material/Characteristics)
List-II (Superconductor kind)
a. Incomplete Meissner's effect, high critical field and transition temperature. Absence of Silsbee's rule
1. Hard superconductor
b. Meissner's effect and Silsbee's rule
2. Soft superconductor
c. Amorphous thin films of Be, Bi and Fi
3. Superconductor
| List-I (Material/Characteristics) | List-II (Superconductor kind) |
| a. Incomplete Meissner's effect, high critical field and transition temperature. Absence of Silsbee's rule | 1. Hard superconductor |
| b. Meissner's effect and Silsbee's rule | 2. Soft superconductor |
| c. Amorphous thin films of Be, Bi and Fi | 3. Superconductor |
82. Total number of crystal system is
83. When copper is added to silver in small quantity so as to form an alloy, the resistivity of such an alloy is
84. The relative permeability is less than 1 in
85. The outermost electronic configuration a cobalt atom is 3d74s2. Its magnetic moment is-
86. The critical stress σc for crack propagation in a brittle material, using the principles of fracture mechanics is
87. The wavelength of light emitted by a GaAs laser is 8670 × 10-10 m. Given Planck's constant = 6.6256 × 10-34 Js, velocity of light = 2.998 × 108 ms-1 and 1eV = 1.602 × 10-19 J, the energy gap in GaAs is
88. Blood flow can be measured using the electromagnetic principle because blood has a high
89. n - type silicon is obtained by doping silicon with
90. The value of critical current density in a superconductor depends upon
1. Temperature
2. Magnetic field strength
3. Penetration depth
1. Temperature
2. Magnetic field strength
3. Penetration depth
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