Question : Which of the following principles is used to produce 'low temperatures'?
Option 1: Superconductivity
Option 2: Joule-Kelvin effect
Option 3: Thermo-electric effect
Option 4: Adiabatic demagnetisation
Correct Answer: Adiabatic demagnetisation
Solution : The correct option is Adiabatic demagnetisation.
To achieve low temperatures, an adiabatic demagnetisation method is helpful. This technique helps to achieve low temperatures of around 1K for the electronic paramagnetic salts. However, the temperature can be as low as possible for the nuclear paramagnets. There are numerous compounds or elements known as nuclear paramagnets that have no magnetic moments but do have magnetic moments in their nuclei. For magnetic refrigeration, these magnetic moments are helpful.
Application | Eligibility | Selection Process | Result | Cutoff | Admit Card | Preparation Tips
Question : Which of the following is the correct statement?
Option 1: Joule is the unit of work
Option 2: The unit of energy is the watt.
Option 3: Joule/ second is also a unit of energy.
Option 4: The unit of power is joule/newton.
Question : Which of the following was the first theory of superconductivity?
Option 1: Ginzburg-Landau theory
Option 2: London theory
Option 3: Resonating valence bond theory
Option 4: Quantum field theory
Question : Which material is used in the manufacturing of electric heater coil?
Option 1: Copper
Option 2: Iron
Option 3: Nickel
Option 4: Nichrome
Question : Cryogenics is:
Option 1: a scientific study of dust
Option 2: study of heat
Option 3: scientific study of very low temperatures
Option 4: study of genesis
Question : Coulomb/second is a unit of which of the following?
Option 1: Capacitance
Option 2: Resistance
Option 3: Electric current
Option 4: Magnetism
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile