Modern Physics – Relativity, Quantum Mechanics MCQs

1. According to Einstein’s theory of Special Relativity, what remains constant for all observers in uniform motion?
(A) Time
(B) Mass
(C) Speed of light
(D) Distance

2. What does the phenomenon of time dilation imply?
(A) Moving clocks tick faster
(B) Stationary clocks tick faster
(C) Time is absolute
(D) Moving clocks tick slower

3. What is the consequence of traveling at speeds close to the speed of light, according to Special Relativity?
(A) Mass remains constant
(B) Time flows faster
(C) Length contracts
(D) Energy decreases

4. General Relativity primarily deals with:
(A) Objects moving at constant speeds
(B) Quantum particles
(C) Gravity and acceleration
(D) Electricity and magnetism

5. What does the Heisenberg Uncertainty Principle state?
(A) Energy is quantized
(B) Particles have fixed orbits
(C) Position and momentum cannot be precisely known simultaneously
(D) Electrons have continuous energy levels

6. In quantum mechanics, what is the term for the smallest possible discrete unit of energy?
(A) Photon
(B) Molecule
(C) Quark
(D) Atom

7. Which experiment demonstrated the particle nature of light?
(A) Photoelectric effect
(B) Double-slit experiment
(C) Millikan oil drop
(D) Rutherford scattering

8. Who proposed the wave-particle duality concept for matter?
(A) Bohr
(B) Heisenberg
(C) Einstein
(D) de Broglie

9. The Schrödinger equation is fundamental to:
(A) Special Relativity
(B) Classical Mechanics
(C) Quantum Mechanics
(D) Electromagnetism