Low Temperature Physics - Unit1

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

• Super fluidity

• Thermal conductivity

• Paramagnetism

• Superconductivity

viscosity is very high and it can pass through a capillary tube without any resistance is called super-fluidity

• True

• False

1.      The entropy of a substance tends to ------ value at very low temperatures.

• One

• zero

• infinity

• negative

The magnetic susceptibility of certain paramagnetic salts like copper sulphate vary inversely as the absolute temperature in the region of low temperatures

• True

• False

Which of the following is not a freezing mixture?

• Salt + Ice

• Calcium Chloride + Ice

• Potassium Hydrate + Ice

• Aluminum + Ice

Which of the following are paramagnetic substances

• Gadalonium sulphate

• Cerium fluoride

• Ammonium Nitrate

• Liquid Hydrogen

A process in which the gaseous substance transforms into a liquid state is called

• Liquefaction

• Regenerative Cooling

• Freezing of mixtures

• Joule Thomson Effect

Adiabatic magnetization is

• The process of removal of a magnetic field from certain materials

• The process of expansion thereby taking heat from the surroundings

• The process of expansion at constant enthalpy

• The process of mixing hydrogen and helium

Which of the following quantity is constant in Joule Thomson effect???

• Entropy

• Enthalpy

• Internal Energy

• Heat

The process in which compressed gas is cooled by allowing it to expand and thereby take heat from the surroundings.

• Joule Thomson effect

• Freezing of mixtures

• Regenerative cooling

• Liquefaction