Select the most appropriate Diamagnetic option: Paramagnetic:
A. Permalloy : Super-alloy
B. Nickel : Cobal
C. Iron : Steel
D. Water : Air
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Which luminous substance is responsible for the red color fluorescence ?
A. Calcium silicate
B. Zinc sulphide
C. Magnesium silicate
D. Zinc silicate
ALNICO is a combination of ____ ?
A. iron, cobalt, nickel.
B. aluminium, nickel, iron and cobalt.
C. iron, aluminium.
D. aluminium, nickel.
When is the electron pair bonding going to happen ?
A. Share holes
B. Lack holes
C. Share electrons
D. None of them
Which of the following describes a piezoelectric material in an example ?
A. Potassium niobate
B. Lead zirconate titanate
C. Copper
D. All of them
What is the value of dielectric constant of air ?
A. Less than 1
B. 0
C. 1
D. None
Why is a diamond so hard ?
A. Because of high melting point
B. Because of covalent solid
C. Because of large cohesive energy
D. None of them
Which insulating materials are capable of withstanding the highest temperature ?
A. Glass
B. Mica
C. Porcelain
D. All of them
What is the number of classifications of insulators ?
A. 5
B. 6
C. 7
D. 8
What is the dielectric constant of mica?
A. 100
B. 1 to 2
C. 200
D. 3 to 8