Super conductivity can be destroyed by

On which of the following factors does the resistivity of a material depend ?

A. Resistance of the conductor

B. Area of the conductor section

C. Length of the conductor

D. All of the above

Piezoelectric materials serve as a source of ________ .

A. Resonant waves

B. Musical waves

C. Microwaves

D. Ultrasonic waves

The tiny block formed by the arrangement of a small group of atoms is called the

A. Unit cell

B. Space lattice

C. Either A or B

D. None of the above

The number of atoms per unit cell in B.C.C. structure is

A. 1

B. 2

C. 4

D. 8