Production of Low temperature

The process of removal of a magnetic field from certain materials that serve to lower their temperature is known as

• adiabatic demagnetization

• demagnetization

• adiabatic magnetization

• magnetization

Identify the correct principles and processes to produce low temperatures.

1. 1. Adiabatic demagnetization

2. 2. Thermoelectric cooling

3. 3. Reversible adiabatic expansion of gas

4. 4. Irreversible adiabatic expansion of a real gas

• 1 and 2 only

• 1 and 3 only

• 1, 2 and 3 only

• 1,2, 3 and 4

Susceptibility measurement coils are used for

• Heat

• Magnetic field

• temperature

• volume

Identify the Paramagnetic substances ( More than one option are correct)

• Gadalonium sulphate

• Cerium fluoride

• chromium potassium alum

• Iron ammonium

A method of cooling gases in which compressed gas is cooled by allowing it to expand and thereby take heat from the surroundings is

• Freezing of mixtures

• Joule Thomson effect

• Regenerative cooling

• Adiabatic demagnetization

The most common phenomenon used in liquefaction of gases is

• Adiabatic demagnetization

• Freezing of mixtures

• Regenerative cooling

• Joule - Thomson effect

At very low temperatures, the entropy of a substance tends to

• zero

• one

• infinite

• undefined

The magnetic susceptibility of certain paramagnetic salts vary ______ to the absolute temperature in the region of low temperatures.

• Equals

• Proportional

• Inversely proportional

• Not related

The property of a metal of completely losing its electrical resistance in the neighborhood of absolute zero of temperature is

• Resistivity

• Super conductivity

• Conductivity

• susceptibility

From the definition, Susceptibility is