The Fermi energy increases with: A. Temperature B. Particle density C. Pressure only D. Volume only Explanation: Higher density raises highest occupied energy level.
Which symmetry leads to conservation of energy (Noether’s theorem)? A. Spatial symmetry B. Time translation symmetry C. Rotational symmetry D. Gauge symmetry Explanation: Invariance under time translation implies energy conservation.
The wavefunction of a particle must be continuous because: A. It represents force B. Its square gives probability density C. It represents velocity D. It defines temperature Explanation: Discontinuity would imply undefined probability.
In a relativistic particle collision, total energy is conserved but: A. Mass is always conserved separately B. Mass can convert into energy C. Momentum is not conserved D. Charge is not conserved Explanation: Relativity allows interconversion of mass and energy via (E=mc^2).
Which energy source is cleanest? A. Coal B. Oil C. Solar D. Gas Explanation: Solar produces minimal pollution.
Which rock is sedimentary? A. Granite B. Basalt C. Sandstone D. Marble Explanation: Sandstone forms from sediments.
Which process produces seeds? A. Germination B. Pollination C. Fertilization D. Photosynthesis Explanation: Fertilization forms seeds.
Which system removes waste? A. Digestive B. Excretory C. Respiratory D. Circulatory Explanation: Kidneys filter waste.
Which force holds electrons in orbit? A. Nuclear B. Magnetic C. Electrostatic D. Gravitational Explanation: Coulomb attraction binds electrons.