Which blood cells fight infection? A. RBC B. Platelets C. WBC D. Plasma Explanation: White blood cells defend body.
Which organelle produces ATP? A. Nucleus B. Ribosome C. Mitochondria D. Golgi Explanation: Mitochondria generate ATP.
Which biomolecule is enzyme? A. Lipid B. Protein C. Carbohydrate D. DNA Explanation: Enzymes are proteins.
Which bond is strongest? A. Ionic B. Hydrogen C. Covalent D. Van der Waals Explanation: Covalent bonds involve electron sharing.
Which compound conducts electricity in solution? A. Sugar B. Salt C. Alcohol D. Benzene Explanation: Ionic compounds dissociate into ions.
Which process increases entropy? A. Freezing B. Condensation C. Mixing gases D. Crystallization Explanation: Mixing increases disorder.
Which law relates pressure and volume? A. Charles’ law B. Boyle’s law C. Avogadro’s law D. Dalton’s law Explanation: Pressure inversely proportional to volume.
Which property is quantized in atom? A. Energy B. Velocity C. Force D. Distance only Explanation: Atomic energy levels are discrete.
Which particle is a lepton? A. Proton B. Neutron C. Electron D. Gluon Explanation: Electron belongs to lepton family.