Which solution has pH < 7? A. Neutral B. Basic C. Acidic D. Buffer Explanation: Acids have pH less than 7.
Which bond shares electrons? A. Ionic B. Covalent C. Metallic D. Hydrogen Explanation: Covalent bonds share electrons.
Which state has fixed volume but no shape? A. Solid B. Liquid C. Gas D. Plasma Explanation: Liquids have definite volume.
Which particle orbits nucleus? A. Proton B. Neutron C. Electron D. Positron Explanation: Electrons occupy orbitals.
Which law states action equals reaction? A. First law B. Second law C. Third law D. Fourth law Explanation: Newton’s third law.
Which device stores charge? A. Resistor B. Capacitor C. Inductor D. Battery Explanation: Capacitors store electric charge.
Which quantity is vector? A. Mass B. Speed C. Velocity D. Energy Explanation: Velocity has magnitude and direction.
Which force causes objects to fall? A. Magnetic B. Electric C. Gravitational D. Nuclear Explanation: Gravity pulls objects toward Earth.
Which layer has weather? A. Troposphere B. Stratosphere C. Mesosphere D. Thermosphere Explanation: Weather occurs in troposphere.