A. Permalloy : Super-alloy
B. Nickel : Cobal
C.  Iron : Steel
D. Water : Air

A. Calcium silicate
B. Zinc sulphide
C.  Magnesium silicate
D.  Zinc silicate

A.  iron, cobalt, nickel.
B. aluminium, nickel, iron and cobalt.
C. iron, aluminium.
D. aluminium, nickel.

A. Share holes
B. Lack holes
C. Share electrons
D. None of them

A. Potassium niobate
B. Lead zirconate titanate
C. Copper
D. All of them

A.  Less than 1
B. 0
C. 1
D. None

A.  Because of high melting point
B. Because of covalent solid
C. Because of large cohesive energy
D. None of them

A. Glass
B. Mica
C. Porcelain
D. All of them

A. 5
B. 6
C. 7
D. 8

A. 100
B.  1 to 2
C. 200
D.  3 to 8