Which of the following statements is$/$are true

a$).$ Ceramics expands more than metals if the two materials are heated up with the same amount of thermal energy

b$)$ Polymers relatively have low coefficient of expansion

c$)$ If metal conductor is heated up$,$ it will expand in length but not in volume

d$)$ Ceramics has relatively low coefficients of thermal expansion due their strong interatomic bonding

c$)$ All of the above

f$)$ None of the above

Group

a$)$ Alkali

In the periodic table has the highest electronegativity

b$)$ Alkali earth

c$)$ Semi$-$conductors

d$)$ Halogens

The type of stress seen in the figure

$-$a$)$ Tensile

b$)$ Shear

c$)$ Compress

d$)$ None

Conductivity depends on

a$)$ Cross section

b$)$ Conductance

c$)$ Length

d$)$ Temperature

e$)$ None

The band structure in Silicon is characterized by

a$)$ High energy gap

b$)$ Relatively intermediate energy gap

c$)$ The valence band and conduction band are overlapped

d$)$ None

Group Two in the periodic table is characterized by

a$)$ High conductivity

b$)$ High resistivity

c$)$ High mechanical strength

d$)$ Their properties can be controlled by doping process

e$)$ None of the above

Which of the following statements is$/$are not true

a$)$ Ceramics has high coefficient of expansion

b$)$ Conduction due to electric current cause thermal energy in the metals which leads to electron scattering

c$)$ As the thermal energy increased the phonons increased

d$)$ As the thermal energy increased the scattering level increased

e$)$ All of the above

f$)$ None of the above

The material of lower magnetic reluctance for the same dimension from the following,

a$)$ Air

b$)$ aluminum

d$)$ wood

e$)$ Oil

The capacitance of the dielectric depends on

a$)$ Applied voltage

b$)$ Stored charge

c$)$ Permittivity

d$)$ Current

The insulators are affected by increasing the temperature by the following except:

a$)$ Increasing the resistivity

b$)$ Increasing the thermal stresses resulted from the temperature

c$)$ Increasing the number of phonons in the material

d$)$ All of the above