Question : In 1928, which equation was derived and combined quantum theory and special relativity to describe the behaviour of an electron moving at a relativistic speed?
Option 1: Bernoulli's equation
Option 2: Lorentz equation
Option 3: Helmholtz equation
Option 4: Dirac equation
Correct Answer: Dirac equation
Solution : The correct answer is the Dirac equation.
The Dirac equation, developed by physicist Paul Dirac in 1928, is a relativistic wave equation in particle physics. It comprehensively describes spin-1⁄2 massive particles, known as " Dirac particles" including electrons and quarks, maintaining parity symmetry. This equation harmoniously integrates quantum mechanics and special relativity, being the inaugural theory to fully incorporate special relativity into quantum mechanics. Its validation was exemplified by accurately accounting for the fine structure of the hydrogen spectrum.
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Question : The twin paradox is associated with:
Option 1: The theory of relativity
Option 2: Particle physics
Option 3: Hydrodynamics
Option 4: Quantum mechanics
Question : A's salary is 40% of B's salary and B's salary is 25% of C's salary. What percentage of C's salary is A's salary?
Option 1: 5%
Option 2: 10%
Option 3: 15%
Option 4: 20%
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 : Directions: In a family of five members, P is Q's sister and R is Q's mother. S is R's father and T is S's mother. How is P related to S?
Option 1: Granddaughter
Option 2: Niece
Option 3: Daughter
Option 4: Mother
Question : Lactometers (used to determine the purity of a sample of milk) and hydrometers (used to determine the density of liquids) are based on the ______ principle.
Option 1: Archimedes
Option 2: Special Relativity
Option 3: Relativity
Option 4: Uncertainty
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