Smart and nanomaterials (part -I)

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

• Resistance of the conductor

• Area of the conductor section

• Length of the conductor

• All of the above

Piezoelectric materials serve as a source of ________

• Resonant waves

• Musical waves

• Microwaves

• Ultrasonic wave

Dielectric constant for vacuum is

• 0.

• 1.

• 100.

• infinity.

What is the process of producing electric dipoles inside the dielectric by an external electric field?

• Polarisation

• Dipole moment

• Susceptibility

• Magnetisation

Which of the following easily adapt itself to store electrical energy?

• Passive dielectric

• Superconductor

• Active dielectric

• Polar molecules

How does ionic polarisation occur?

• Splitting of ions

• Passing magnetic field

• Displacement of cations and anions

• Never occurs

Which of the following polarisations is very rapid?

• Electronic polarisation

• Ionic polarisation

• Space charge polarisation

• Orientation polarisation

Which of the following is the slowest polarisation method?

• Ionic polarisation

• Orientation polarisation

• Electronic polarisation

• Space charge polarisation

When does a dielectric become a conductor?

• At avalanche breakdown

• At high temperature

• At dielectric breakdown

• In the presence of magnetic field

Which of the following breakdowns occur at a higher temperature?

• Avalanche breakdown

• Thermal breakdown

• Electrochemical breakdown

• Dielectric breakdown