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
11
What is the largest source of freshwater on Earth?
Answer:
Ice caps and glaciers
Around 68% of freshwater is frozen in ice. Only a small fraction is accessible in rivers and lakes. Melting glaciers add to sea-level rise.
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12
Which of the following is a renewable energy resource?
Answer:
Wind
Renewable energy sources can replenish naturally. Wind energy uses turbines to produce electricity. Fossil fuels are non-renewable.
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13
Which natural disaster is measured by the Mercalli scale?
Answer:
Earthquake intensity
The Mercalli scale measures the observed effects of earthquakes. Unlike Richter, it focuses on damage. It ranges from I (not felt) to XII (total destruction).
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14
The "hole" in the ozone layer is most severe over:
Answer:
Antarctica
Cold conditions allow CFC chemicals to act strongly. Ozone depletion peaks during spring in the Southern Hemisphere. International action has helped reduce the problem.
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15
Which greenhouse gas has the highest heat-trapping ability per molecule?
Answer:
bility per molecule?
N₂O is about 300 times stronger than CO₂ in trapping heat. Though less abundant, it has a significant warming effect. Agriculture is a key source.
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16
The Coriolis effect is caused by:
Answer:
Earth’s rotation
The rotation deflects moving air and water. In the Northern Hemisphere, currents deflect right, and in the Southern, left. This drives global wind patterns.
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17
The auroras (northern and southern lights) occur in which layer of the atmosphere?
Answer:
Thermosphere
Charged particles collide with gases in the thermosphere. These interactions produce glowing lights near the poles. Auroras are strongest during solar storms.
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18
Which soil type drains water the fastest?
Answer:
Sandy soil
Sand has the largest particles, leaving gaps for water to escape quickly. This makes sandy soils dry. They are poor in nutrients compared to loam.
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19
Which rock type often contains fossils?
Answer:
Sedimentary
Fossils are preserved in sedimentary layers formed by compaction. Igneous rocks form from heat and rarely preserve life. Metamorphism destroys fossils.
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20
Which layer of Earth is responsible for generating the magnetic field?
Answer:
Outer core
The outer core is liquid iron and nickel. Movement of this molten metal creates convection currents. These currents generate Earth’s magnetic field.
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