Which force binds nucleus? A. Gravitational B. Electromagnetic C. Strong nuclear D. Weak nuclear Explanation: Strong force holds nucleons together.
Which cycle involves evaporation? A. Nitrogen cycle B. Water cycle C. Carbon cycle D. Rock cycle Explanation: Evaporation is key part of hydrologic cycle.
Which process drives rock cycle? A. Solar radiation B. Internal heat C. Gravity only D. Wind only Explanation: Earth’s internal heat drives geological processes.
Which mineral is hardest? A. Quartz B. Diamond C. Gypsum D. Talc Explanation: Diamond ranks highest on Mohs scale.
Which layer has highest temperature? A. Troposphere B. Stratosphere C. Thermosphere D. Mesosphere Explanation: Thermosphere has very high temperatures.
Which ocean current is warm? A. Labrador B. California C. Gulf Stream D. Canary Explanation: Gulf Stream carries warm water.
Which boundary creates earthquakes without volcanism? A. Divergent B. Convergent C. Transform D. Rift Explanation: Transform faults produce earthquakes.
Which rock type is formed by compression of sediments? A. Igneous B. Metamorphic C. Sedimentary D. Volcanic Explanation: Sedimentary rocks form via compaction.
Which gas contributes most to greenhouse effect after water vapor? A. Methane B. CO₂ C. Ozone D. Nitrogen Explanation: CO₂ is major anthropogenic greenhouse gas.
Which biome has highest biodiversity? A. Desert B. Tundra C. Tropical rainforest D. Grassland Explanation: Warm, wet climate supports high diversity.