General Science/Everyday Science MCQs
Topic Notes: General Science/Everyday Science
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
81
Which is Earth’s deepest internal part?
Answer:
Inner core
The inner core is Earth’s hottest and most central region, reaching temperatures near the Sun’s surface. Despite extreme heat, it remains solid due to immense pressure. It is mostly composed of iron and nickel.
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82
The asthenosphere is best described as being located:
Answer:
sthenosphere is best described as being located:
The asthenosphere lies beneath the lithosphere and is semi-molten. Its plastic behavior allows tectonic plates to move over it. This makes it a key zone in plate tectonics and earthquake activity.
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83
How many major internal layers form Earth’s structure?
Answer:
3
Earth is broadly divided into crust, mantle, and core. The mantle is semi-solid rock, while the core is metallic. Some subdivisions exist, but the primary classification is into three main layers.
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84
Earth’s core is mainly composed of which metals?
Answer:
Nickel and iron
The inner and outer core are rich in iron and nickel, giving Earth a dense, metallic center. The outer core is liquid, while the inner core is solid due to extreme pressure. This metal mixture drives Earth’s magnetic field.
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85
Which of the following is Earth’s thinnest and outermost layer?
Answer:
nd outermost layer?
The crust is the topmost layer of Earth, only a few kilometers thick under oceans and thicker under continents. It is made of rocks rich in silicon and oxygen. All human activity, vegetation, and surface processes occur on this layer.
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86
Which statement about CBAM scope is accurate for the early years?
Answer:
Limited to high-leakage sectors like steel, cement, fertilizers, aluminum, hydrogen, electricity
The mechanism phases in, beginning with a narrow set of carbon-intensive goods. ([EU Trade](https://trade.ec.europa.eu/access-to-markets/en/news/carbon-border-adjustment-mechanism-cbam?utm_source=chatgpt.com "Carbon Border Adjustment Mechanism (CBAM)"))
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87
Which law was called “the first continent-wide, comprehensive law of its kind” for restoration?
Answer:
EU Nature Restoration Law
The European Commission describes it as the first comprehensive restoration law at continental scale. ([Environment](https://environment.ec.europa.eu/topics/nature-and-biodiversity/nature-restoration-regulation_en?utm_source=chatgpt.com "The EU #NatureRestoration Law"))
88
Which of the following best summarizes the 2025 hydrogen market outlook?
Answer:
est summarizes the 2025 hydrogen market outlook?
The IEA emphasized cancellations/delays and policy uncertainty curbing momentum. ([Reuters](https://www.reuters.com/sustainability/climate-energy/iea-cuts-2030-low-emissions-hydrogen-production-outlook-by-nearly-quarter-2025-09-12/?utm_source=chatgpt.com "IEA cuts 2030 low-emissions hydrogen production outlook by nearly a quarter"))
89
Which development did not occur by mid-2025?
Answer:
Plastics treaty finalized
Geneva talks collapsed without a final treaty; other listed events did occur. ([AP News](https://apnews.com/article/e73090282a22be7ff5979ea2d648dc10?utm_source=chatgpt.com "No end in sight to plastic pollution crisis as treaty negotiations in Geneva fail"))
90
A primary objective of the EU Nature Restoration Law is to:
Answer:
Restore degraded ecosystems to store carbon and reduce disaster risks
The regulation links restoration to climate mitigation, adaptation, and resilience benefits. ([Environment](https://environment.ec.europa.eu/topics/nature-and-biodiversity/nature-restoration-regulation_en?utm_source=chatgpt.com "The EU #NatureRestoration Law"))