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
31
Most tsunamis are caused by:
Answer:
re caused by:
Seafloor shifts displace huge water volumes. This creates destructive waves. Tsunamis can cross oceans at high speed.
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32
The "Ring of Fire" is located around which ocean?
Answer:
round which ocean?
The Pacific Rim is earthquake- and volcano-prone. It includes subduction zones and active faults. Most eruptions occur here.
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33
Which scale measures earthquake magnitude?
Answer:
Richter scale
The Richter scale assigns numbers based on seismic energy. It is logarithmic, meaning each step is 10 times stronger. Quakes above 7 are considered major.
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34
The device that records earthquake waves is:
Answer:
Seismograph
A seismograph tracks vibrations of Earth. It records wave patterns during quakes. Data is used to measure magnitude.
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35
The point on Earth’s surface directly above an earthquake origin is:
Answer:
Epicenter
The focus is the origin below ground. The epicenter lies directly above it. It is where shaking is usually strongest.
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36
Without the greenhouse effect, Earth would be:
Answer:
Much colder
Greenhouse gases maintain Earth’s average 15°C temperature. Without them, it would drop below -18°C. This makes life possible.
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### Natural Disasters
37
The ozone layer shields Earth from:
Answer:
Harmful UV radiation
UV radiation damages DNA and ecosystems. Ozone absorbs it before reaching Earth. Its depletion increases skin cancer risk.
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38
The biggest human source of greenhouse gases is:
Answer:
Fossil fuel burning
Coal, oil, and gas combustion release CO₂. This is the main driver of climate change. Industrialization increased emissions sharply.
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39
Acid rain is mainly due to:
Answer:
cid rain is mainly due to:
SO₂ and NOₓ form acids when dissolved in rainwater. They come from vehicles and industries. Acid rain harms plants, soils, and buildings.
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40
Which is a consequence of global warming?
Answer:
consequence of global warming?
Melting glaciers and thermal expansion raise sea levels. This threatens coastal communities. It also affects ecosystems worldwide.
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