Which metal is reactive? A. Gold B. Silver C. Sodium D. Platinum Explanation: Sodium is highly reactive.
Which wave shows interference? A. Light B. Sound C. Water D. All Explanation: All waves can interfere.
Which device measures current? A. Voltmeter B. Ammeter C. Barometer D. Thermometer Explanation: Ammeter measures current.
Which force acts between charges? A. Gravitational B. Magnetic C. Electric D. Nuclear Explanation: Electric force acts on charges.
Which layer protects from UV? A. Troposphere B. Stratosphere C. Mesosphere D. Thermosphere Explanation: Ozone absorbs UV.
Which boundary causes earthquakes? A. Divergent B. Convergent C. Transform D. All Explanation: All plate boundaries can generate earthquakes.
Which rock forms from cooling lava? A. Granite B. Basalt C. Marble D. Slate Explanation: Basalt is extrusive igneous rock.
Which gas is most abundant greenhouse gas? A. CO₂ B. CH₄ C. H₂O vapor D. O₃ Explanation: Water vapor dominates greenhouse effect.
Which biome has highest rainfall? A. Desert B. Tundra C. Rainforest D. Grassland Explanation: Rainforests receive heavy rainfall.