Which structure forms spindle fibers? A. Ribosome B. Centrosome C. Lysosome D. Golgi Explanation: Centrosomes organize spindle.
Which reaction forms ester? A. Hydrolysis B. Esterification C. Oxidation D. Reduction Explanation: Acid + alcohol forms ester.
Which reagent reduces aldehydes to alcohols? A. KMnO₄ B. NaBH₄ C. HCl D. PCC Explanation: Sodium borohydride reduces aldehydes.
Which factor increases acidity of organic compounds? A. Electron donating groups B. Electron withdrawing groups C. Alkyl substitution D. Decreasing electronegativity Explanation: Electron-withdrawing stabilizes conjugate base.
Which species is isoelectronic with Ne? A. Na⁺ B. Mg²⁺ C. F⁻ D. All of the above Explanation: All have 10 electrons like neon.
In molecular orbital theory, antibonding orbitals have: A. Lower energy B. Higher energy C. Same energy D. Zero energy Explanation: Antibonding orbitals destabilize molecule.
Which phenomenon is explained by spontaneous symmetry breaking? A. Refraction B. Superconductivity C. Diffusion D. Reflection Explanation: Superconductivity arises from broken gauge symmetry.
The partition function (Z) is related to Helmholtz free energy (F) by: A. (F = kT \ln Z) B. (F = -kT \ln Z) C. (F = Z/kT) D. (F = k/Z) Explanation: Helmholtz free energy derives from partition function logarithm.
In general relativity, geodesics represent: A. Maximum energy paths B. Straightest paths in curved spacetime C. Quantum trajectories D. Stationary points of entropy Explanation: Free-falling particles follow spacetime geodesics.
The Berry phase arises due to: A. Dissipation B. Cyclic adiabatic evolution C. Thermal fluctuations D. Measurement collapse Explanation: Geometric phase accumulates during cyclic parameter evolution.