AUTOMATIC CONTROL SYSTEMS QUIZ

Nickel is a non-magnetic material.

False

True

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Which of the following are true for relative dielectric constant?1. It is dimensionless.2. It is equal to 1 for vacuum.3. It is equal to 1 for all substances.

1 and 2 only

1 and 3 only

2 and 3 only

1, 2 and 3

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The fact that domains exhibits spontaneous magnetisation is

Boltzmann’s statistics

Second hypothesis is of Weiss

Curie-Weiss law

First hypothesis is of Curie

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The elements which become superconducting at extremely low temperatures are

Good conductors at room temperature

Ferromagnetic at room temperature

Insulators at room temperature

Relatively poor conductors at room temperature

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Spontaneous magnetisation is characteristic of ferromagnetic materials.

False

True

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An atom of a rare gas is placed is an electric field E. Then

The nucleus will not be shifted.

The nucleus will be shifted in the direction of E by an amount which is independent of E.

The nucleus will be shifted in a direction opposite to that of E.

The nucleus will be shifted in the direction of E by an amount which is proportional to E.

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Wood is a diamagnetic material.

True

False

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The residual resistivity of a binary alloy at 0 K is

Dependent on the concentration of minor component in the alloy

Difference of residual resistivities of component metals

Product of residual resistivities of component metals

Sum of residual resistivities of component metals

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The merger of hole and free electron is called

Free electrons

Recombination

Thermal energy

Covalent bonding

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A leakage capacitor can be represented by a capacitance C and resistance R in parallel C.

True

False

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