In quantum mechanics, the commutator ([x,p]) equals: A. 0 B. (i\hbar) C. (-i\hbar) D. (\hbar^2) Explanation: Position and momentum operators satisfy ([x,p]=i\hbar).
Which instrument measures wind speed? A. Hygrometer B. Anemometer C. Barometer D. Thermometer Explanation: Anemometer measures wind velocity.
Which cycle involves precipitation? A. Nitrogen B. Carbon C. Water D. Rock Explanation: Precipitation is part of water cycle.
Which process creates variation? A. Mutation B. Respiration C. Digestion D. Circulation Explanation: Mutation introduces genetic variation.
Which gas is essential for photosynthesis? A. O₂ B. CO₂ C. N₂ D. H₂ Explanation: CO₂ is carbon source.
Which energy is heat? A. Thermal B. Kinetic C. Potential D. Chemical Explanation: Heat is thermal energy.
Which process forms valleys? A. Deposition B. Erosion C. Fusion D. Respiration Explanation: Erosion shapes valleys.
Which organism consumes producers? A. Herbivore B. Carnivore C. Omnivore D. Decomposer Explanation: Herbivores eat plants.
Which process loses water in plants? A. Photosynthesis B. Transpiration C. Respiration D. Absorption Explanation: Transpiration releases water vapor.