Which ion is positive? A. Anion B. Cation C. Electron D. Neutron Explanation: Cations lose electrons.
Which base turns red litmus blue? A. Acid B. Base C. Neutral D. Salt Explanation: Bases change litmus color.
Which process releases gas? A. Condensation B. Evaporation C. Freezing D. Deposition Explanation: Evaporation produces gas.
Which device measures voltage? A. Ammeter B. Voltmeter C. Thermometer D. Barometer Explanation: Voltmeter measures potential difference.
Which unit measures power? A. Joule B. Watt C. Newton D. Pascal Explanation: Watt = energy per unit time.
Which force is strongest? A. Gravitational B. Electromagnetic C. Weak D. Strong Explanation: Strong force binds nucleons.
Which layer contains ionosphere? A. Troposphere B. Stratosphere C. Thermosphere D. Mesosphere Explanation: Ionosphere lies within thermosphere.