Physics of Solids

Which of the following statements is NOT correct for superconductors?

• MRI is an application of superconductor.

• Some ceramic materials are good superconductors.

• Superconductor receptivity is zero below a critical temperature.

• A superconductor needs a continuous source of emf supply.

Solids with high values of conductivity offering very low resistance in the flow of current are called

• insulators.

• conductors.

• semi-conductors.

• super conductors.

A trivalent impurity doped semi-conductor is called

• p-type.

• n-type.

• intrinsic.

• extrinsic.

The ratio of tensile stress to tensile strain is called

• Bulk modulus.

• Shear modulus.

• Young modulus.

• Modulus of electricity.

Which of the following elements is a semi-conductor?

• Sodium

• Calcium

• Uranium

• Germanium

The ratio of applied stress to the VOLUMETRIC strain is called

• A. Bulk modulus.

• B. Young's modulus.

• C. modulus of rigidity.

• D. modulus of elasticity.

A doped semi-conductor is called

• A. ceramic.

• B. intrinsic.

• C. extrinsic.

• D. insulator.

Which of the following statements does NOT relate to an insulator?

• A. Complete valence band

• B. Partially filled conduction band

• C. Large energy gap between electrons

• D. Valence electrons are bound very tightly

Which of the following materials is a tetravalent semi-conductor?

• A. Barium

• B. Sodium

• C. Aluminium

• D. Germanium

In terms of structure, nylon is an example of

• A. glassy solids.

• B. polymeric solids.

• C. crystalline solids.

• D. amorphous solids.